WO2025016279A1 - Unmanned aerial vehicle counter device and circuit - Google Patents

Abstract

An unmanned aerial vehicle counter device and circuit. The unmanned aerial vehicle counter circuit comprises a main control unit, a baseband unit, a radio frequency unit and an antenna unit, wherein the antenna unit comprises a receiving antenna and a transmitting antenna. The baseband unit comprises a receiving channel and a transmitting channel, and the radio frequency unit is connected to the transmitting antenna. The receiving antenna is used for receiving an electromagnetic wave signal and converting the electromagnetic wave signal into a first electric signal. The receiving channel is connected to the receiving antenna, and is used for performing signal processing on the first electric signal to obtain a second electric signal. The main control unit is connected to the receiving channel and is used for acquiring, on the basis of a preset software algorithm and the second electric signal, unmanned aerial vehicle information, and on the basis of the unmanned aerial vehicle information, generating a counter signal. The transmitting channel is separately connected to the main control unit and the radio frequency unit, and is used for performing signal processing on the counter signal and outputting to the transmitting antenna the processed signal by means of the radio frequency unit for transmitting.

Description

UAV countermeasure equipment and circuits

This application claims priority to the Chinese patent application filed with the Chinese Patent Office on December 29, 2023, with application number 202311868561.9 and application name “UAV countermeasure equipment and circuit” and the Chinese patent application filed with the Chinese Patent Office on July 14, 2023, with application number 202321857932.9 and application name “UAV interference circuit and its application equipment and system”, all contents of which are incorporated by reference in this application.

Technical Field

The embodiments of the present application relate to the field of drone countermeasures, and in particular to a drone countermeasure device and circuit.

Background Art

One way to control drones in a controlled area is to send a counter signal to drones entering the controlled area, thereby improving the safety of the controlled area.

When implementing signal countermeasures against drones entering a controlled area, traditional countermeasure solutions usually adopt a sweeping frequency countermeasure solution based on VCO or a sweeping frequency countermeasure solution based on DDS digital frequency synthesis technology. However, both of these countermeasure solutions have the problem of fixed and single countermeasure signal characteristics, and the configuration flexibility of the countermeasure signal is poor.

Summary of the invention

Based on this, it is necessary to provide a drone countermeasure device and circuit.

A drone countermeasure circuit includes a main control unit, a baseband unit, a radio frequency unit and an antenna unit, wherein the antenna unit includes a receiving antenna and a transmitting antenna. The baseband unit includes a receiving path and a transmitting path, and the radio frequency unit is connected to the transmitting antenna. The receiving antenna is used to receive an electromagnetic wave signal and convert the electromagnetic wave signal into a first electrical signal. The receiving path is connected to the receiving antenna and is used to perform signal processing on the first electrical signal to obtain a second electrical signal. The main control unit is connected to the receiving path and is used to obtain drone information according to the second electrical signal based on a preset software algorithm and generate a countermeasure signal according to the drone information. The transmitting path is connected to the main control unit and the radio frequency unit respectively, and is used to process the counter signal and output the processed signal to the transmitting antenna through the radio frequency unit for transmission.

A drone countermeasure device comprises the drone countermeasure circuit described above.

The details of one or more embodiments of the present application are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the invention will become apparent from the description, drawings, and claims.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, drawings of other embodiments can be obtained based on these drawings without paying any creative work.

FIG1 is a schematic diagram of a first circuit module of a UAV countermeasure circuit according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of a second circuit module of the drone countermeasure circuit according to an embodiment of the present invention.

FIG3 is a schematic diagram of a third circuit module of the UAV countermeasure circuit according to an embodiment of the present invention.

FIG. 4 is a schematic diagram of a fourth circuit module of the UAV countermeasure circuit according to an embodiment of the present invention.

Description of Figure Numbers:

1: Main control unit, 2: Baseband unit, 3: Radio frequency unit, 4: Antenna unit.

11: first main control unit, 12: second main control unit.

A1, A3: first amplifier, A2, A4: second amplifier, B1, B3: first balun, B2, B4: second balun, S1, S3: first attenuator, S2, S4: second attenuator, Z1, Z3: first filter, Z2, Z4: second filter, PA1, PA2: power amplifier.

41: transmitting antenna, 42: receiving antenna, ANT1, first receiving antenna, ANT2: second receiving antenna, ANT3: first transmitting antenna, ANT4: second transmitting antenna.

U1, U3: transmitter, U2, U4: receiver, U5: FPGA, U6: CPU.

DETAILED DESCRIPTION

In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The drawings show the preferred embodiments of the present application. However, the present application can be implemented in many different forms. The present invention is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the application pertains. The terms used herein in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one. "Connection" can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two components or the interaction relationship between two components, or it can be the direct connection of two circuit modules or the connection through other modules. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

When using traditional countermeasures (such as: VCO-based swept-frequency countermeasures and DDS digital frequency synthesis technology-based swept-frequency countermeasures) to counter UAVs, since both countermeasures have the problem of fixed and single countermeasure signal characteristics, if the UAV manufacturer subsequently modifies the UAV signal (i.e., the communication signal between the UAV and the control terminal) power or format, or if a new model appears, without changing the hardware circuit, it is impossible to identify the UAV information and generate a corresponding countermeasure signal. Or, even if the UAV information can be identified, the countermeasure effect of the generated countermeasure signal is poor. Therefore, the original countermeasure circuit hardware can only be significantly changed to adapt to the manufacturer's adjustments. Therefore, the flexibility of the countermeasure signal configuration of these two traditional countermeasures is poor.

Figure 1 is a schematic diagram of the first circuit module of the drone countermeasure circuit of an embodiment of the present invention. The drone countermeasure circuit of this embodiment includes a main control unit 1, a baseband unit 2, a radio frequency unit 3 and an antenna unit 4. Among them, the antenna unit 4 includes a transmitting antenna 41 and a receiving antenna 42. The baseband unit 2 includes a transmitting path 21 and a receiving path 22. The radio frequency unit 3 is connected to the transmitting path 21 and the transmitting antenna 41, respectively. In this embodiment, the receiving antenna 42 is used to receive an electromagnetic wave signal and convert the electromagnetic wave signal into a first electrical signal. The receiving path 22 is connected to the receiving antenna 42, and is used to perform signal processing on the first electrical signal to obtain a second electrical signal. The main control unit 1 is connected to the receiving path 22, and is used to obtain drone information according to the second electrical signal based on a preset software algorithm and generate a countermeasure signal according to the drone information. The transmitting path 21 is connected to the main control unit 1 and the radio frequency unit 3, respectively, and is used to process the countermeasure signal. The signal is processed and the processed signal is output to the transmitting antenna 41 through the radio frequency unit 3 for transmission.

In this embodiment, the receiving antenna 42 can be implemented by an omnidirectional receiving antenna or a directional receiving antenna, which is not limited in this embodiment. The receiving antenna 42 can receive electromagnetic wave signals in the receiving frequency band in the air, and convert them into electrical signals (i.e., first electrical signals) and then output them to the receiving path 22. The receiving path 22 can perform corresponding signal processing on the first electrical signal to obtain a second electrical signal that can characterize the relevant information of the drone. The main control unit 1 can analyze and process the second electrical signal by running a software algorithm to obtain relevant information of the drone, and can also generate a countermeasure signal corresponding to the drone information by running a preset software algorithm. The transmitting path 21 can perform corresponding transmission signal processing on the countermeasure signal output by the main control unit 1, and the radio frequency unit 3 converts the processed countermeasure signal into a radio frequency signal and outputs it to the transmitting antenna 41 to drive the transmitting antenna 41 to transmit electromagnetic wave signals that can interfere with the drone signal, thereby realizing the countermeasure against the drone. Among them, the receiving signal processing involved in the receiving path 22 and the transmitting signal processing involved in the transmitting path 21 include but are not limited to amplification processing, filtering processing, analog-to-digital conversion processing, digital-to-analog conversion processing, signal analysis processing, etc., which are not limited in this embodiment.

In the technical solution of the embodiment of the present application, since the main control unit 1 obtains drone information and generates counter signals based on software algorithms, if the drone information changes, it only needs to update the software algorithm in the main control unit 1 accordingly to re-realize the recognition of drone information and the targeted generation of counter signals. Compared with the traditional sweep frequency countermeasure solution based on VCO or DDS digital frequency synthesis technology, it does not need to make significant changes to the original hardware circuit, thus improving the flexibility of counter signal configuration. And because the software algorithm is used to generate counter signals for drone information, it is also beneficial to improve the countermeasure performance against drones.

Further, as shown in FIG2 , in an optional embodiment, the main control unit 1 includes a first main control unit 11 and a second main control unit 12 connected to each other, and the first main control unit 11 is also connected to the receiving path 22 and the transmitting path 21. The first main control unit 11 is used to identify the drone communication signal in the second electrical signal, and the first main control unit 11 or the second main control unit 12 is used to obtain drone information according to the drone communication signal based on a preset software algorithm and generate the counter signal according to the drone information.

In a specific application, the first main control unit 11 can be FPGA, MCU, DSP, etc., and the second main control unit 12 can be CPU, FPGA, MCU, DSP, etc. For example, the first main control unit 11 uses a preset software algorithm to identify whether the second electrical signal after signal processing contains a drone communication signal, and then either the first main control unit 11 or the second main control unit 12 can use the preset software algorithm to The method decodes the communication signal of the identified drone to obtain relevant drone information, including but not limited to the model, serial number, frequency band, location, distance, pitch angle and other information of the drone, and further generates a counter signal based on the drone information and software algorithm. It should be noted that obtaining drone information and generating a counter signal can be implemented by the same main control unit (11, 12), for example, obtaining drone information and generating a counter signal are both implemented by the first main control unit 11 (such as FPGA U5).

Of course, obtaining drone information and generating counter signals can also be implemented by different main control units. Preferably, obtaining drone information can be implemented by the first main control unit 11 (such as FPGAU5), and generating counter signals can be implemented by the second main control unit 12 (such as CPU U6). In practical applications, for drone countermeasure equipment with an alarm function, the functions of the drone countermeasure equipment include two parts: an alarm function and a countermeasure function. The alarm function can warn whether a drone appears. The alarm function requires higher timeliness than the countermeasure function in terms of timing (because the user needs to be warned when the drone just enters the detection range, and the countermeasure function is executed according to the user's actual countermeasure needs. For example, even if the user is warned, he may not choose to use the countermeasure function). Since the presence of a drone in its detection range can be determined when the drone communication signal is identified, an alarm can be issued when the drone communication signal in the second electrical signal is identified to indicate the presence of a drone. Therefore, the technical solution of the present invention enables the first main control unit 11 that receives the second electrical signal earlier to identify the drone communication signal, so that the drone communication signal can be identified earlier to ensure the timeliness of the alarm, and the generation of the counter signal can be achieved by either the first main control unit 11 or the second main control unit 12, which is not limited in this embodiment.

2 is a schematic diagram of a second circuit module of a drone countermeasure circuit according to an embodiment of the present invention. The drone countermeasure circuit according to this embodiment includes a main control unit 1 , a baseband unit 2 , a radio frequency unit 3 and an antenna unit 4 .

In the main control unit 1 of this embodiment, the main control unit 1 includes a first main control unit 11 and a second main control unit 12 connected to each other, wherein the first main control unit 11 is FPGAU5, and the second main control unit 12 is CPU U6. It should be understood that in actual applications, the second main control unit 12 should also include a peripheral circuit connected to CPUU6 (not shown in the figure). In the baseband unit 2, the baseband unit 2 includes a transmission path 21, wherein the transmission path 21 includes a transmitter U1, a first balun B1, and a first filter Z1 connected in sequence, and the input end of the transmitter U1 is connected to the main control unit 1, and the output end of the first filter Z1 can be connected to the radio frequency unit 3. The number of transmission paths can also be more than one, for example, two, wherein FIG. Figures 4 to 5 show the case where there are two transmission paths. In addition to the transmission path 21, there is also a transmission path 23 in Figures 2 to 4. In order to distinguish the components in the transmission path 21, the components in the transmission path 23 are numbered differently from those in the transmission path 21. Similarly, the transmission path 23 includes a transmitter U3, a first balun B3, and a first filter Z3 connected in sequence, and the input end of the transmitter U3 is connected to the main control unit 1, and the output end of the first filter Z3 can be connected to the RF unit 3.

In this embodiment, specifically, the input ends of the transmitters U1 and U3 can be connected to the first main control unit 11 in the main control unit 1. When a counter signal needs to be transmitted, the first main control unit 11 can output the corresponding counter signal to the corresponding transmission path (21, 23), and the transmitter U1 (or transmitter U3) performs digital-to-analog conversion and modulation processing on the counter signal, and can send the processed counter signal to the first filter Z1 (or the first filter Z3) for filtering after passing through the first balun B1 (or the first balun B3), and then the first filter Z1 (or the first filter Z3) amplifies the filtered counter signal through the radio frequency unit 3 and outputs it to the transmitting antenna 41 for transmission.

Furthermore, the transmission path (21, 23) also includes a first attenuator (S1, S3) connected between the output end of the first filter (Z1, Z3) and the radio frequency unit 3. Specifically, as shown in FIG2, the transmission path 21 also includes a first attenuator S1 connected between the output end of the first filter Z1 and the radio frequency unit 3. The transmission path 23 includes a first attenuator S3 connected between the output end of the first filter Z3 and the radio frequency unit 3. In this embodiment, the first attenuator S1 (or the first attenuator S3) can attenuate the signal after filtering to reduce the signal power of the counter signal output to the radio frequency unit 3, thereby achieving the adjustment of the transmission power. Of course, in other optional embodiments, if the first attenuator S1 (or the first attenuator S3) is omitted, the transmitter U1 (or the transmitter U3) can also adjust the signal power of the counter signal, thereby achieving the adjustment of the transmission power.

Furthermore, the second main control unit 12 or the first main control unit 11 can also be connected to the first attenuator S1, and is used to control the attenuation of the first attenuator S1 according to the current countermeasure demand. Similarly, the second main control unit 12 or the first main control unit 11 can also be connected to the first attenuator S3, and is used to control the attenuation of the first attenuator S3 according to the current countermeasure demand. In this embodiment, the first attenuator S1 (or the first attenuator S3) is an attenuator with controllable attenuation, and the attenuation of the first attenuator S1 (or the first attenuator S3) is controlled by the second main control unit 12 or the first main control unit 11 according to actual needs.

In the baseband unit 2, the baseband unit 2 also includes a receiving path 22, wherein the receiving path 22 It includes a receiver U2, a second balun B2, a second filter Z2, and a first amplifier A1 connected in sequence, and the input end of the first amplifier A1 is connected to the receiving antenna 42, and the output end of the receiver U2 is connected to the main control unit 1 (such as the first main control unit 11). Similarly, the number of receiving paths can be more than one, for example, two, wherein Figures 2 to 4 show the case where there are two receiving paths. In addition to the receiving path 22, in Figures 2 to 4, there is also a receiving path 24. To distinguish the components in the receiving path 22, the numbers of the components in the receiving path 24 are different from those in the transmitting path 21. The receiving path 24 includes a receiver U4, a second balun B4, a second filter Z4, and a first amplifier A3 connected in sequence, and the input end of the first amplifier A3 is connected to the receiving antenna 42, and the output end of the receiver U4 is connected to the main control unit 1.

In this embodiment, the number of receiving antennas 42 is the same as the number of receiving paths, and the receiving antenna 42 includes a first receiving antenna ANT1 and a second receiving antenna ANT2. Specifically, the output ends of the receivers U2 and U4 can be connected to the first main control unit 11 in the main control unit 1. In the receiving path 22, the receiving antenna 42 corresponding to the receiving path 22 is the first receiving antenna ANT1, and the first amplifier A1 can amplify the electrical signal (i.e., the first electrical signal) output by the first receiving antenna ANT1 in the receiving path 22 and output it to the second filter Z2. The second filter Z2 can filter the electrical signal amplified by the first amplifier A1, and can output the filtered electrical signal to the receiver U2 through the second balun B2. The receiver U2 can perform analog-to-digital conversion and demodulation on the electrical signal filtered by the second filter Z2 and output it to the first main control unit 11 in the main control unit 1. Similarly, in the receiving path 24, the receiving antenna 42 corresponding to the receiving path 24 is the second receiving antenna ANT2, and the first amplifier A3 can amplify the electrical signal (i.e., the first electrical signal) output by the receiving antenna ANT2 in the receiving path 24 and output it to the second filter Z4. The second filter Z4 can filter the electrical signal amplified by the first amplifier A3, and can output the filtered electrical signal to the receiver U4 through the second balun B4. The receiver U4 can perform analog-to-digital conversion and demodulation on the electrical signal filtered by the second filter Z4 and output it to the first main control unit 11 in the main control unit 1. It can be understood that the electrical signal output by the receiver U2 (or receiver U4) is the second electrical signal.

Furthermore, the receiving path (22, 24) further includes a second amplifier (A2, A4) connected between the second filter (Z2, Z4) and the second balun (B2, B4). As shown in FIG2, the receiving path 22 further includes a second amplifier A2 connected between the second filter Z2 and the second balun B2. Similarly, the receiving path 24 further includes a second amplifier A4 connected between the second filter Z4 and the second balun B4. In this embodiment, the structure of the receiving path (22, 24) is a two-stage amplification structure. The first stage amplification is implemented by the first amplifier A1 (or the first amplifier A3), and the latter stage amplification is implemented by the second amplifier A2 (or the second amplifier A4).

Furthermore, the receiving path (22, 24) also includes a second attenuator (S2, S4) connected between the second filter (Z2, Z4) and the first amplifier (A1, A3). As shown in FIG. 2, the receiving path 22 also includes a second attenuator S2 connected between the second filter Z2 and the first amplifier A1. Similarly, the receiving path 24 also includes a second attenuator S4 connected between the second filter Z4 and the first amplifier A3. In this embodiment, the structure of the receiving path (22, 24) is a two-stage amplification structure, and the inventors have found in actual applications that since the first stage of amplification is implemented by the first amplifier A1 (or the first amplifier A3), the signal will not be amplified much after passing through the first amplifier A1 (or the first amplifier A3), and there will be no risk of oversaturation. The second stage of amplification is implemented by the second amplifier A2 (or the second amplifier A4), and since the second amplifier A2 (or the second amplifier A4) is a two-stage amplification, it is possible that oversaturation will occur, resulting in distortion of the output signal. Therefore, a second attenuator S2 (or the second attenuator S4) is provided before the second amplifier A2 (or the second amplifier A4), so as to avoid oversaturation of the second amplifier A2 (or the second amplifier A4). In addition, since the first main control unit 11 has a range requirement for the acceptable input signal amplitude, if the input signal amplitude is not within this range, it will affect the operation of the first main control unit 11, and may reduce the resolution of the second electrical signal received by the first main control unit 11, thereby causing the first main control unit 11 to have a large error rate in identifying the drone communication signal. Therefore, in the embodiment of the present invention, a second attenuator S2 (or a second attenuator S4) is provided between the first amplifier (A1, A3) and the second amplifier (A2, A4), specifically between the second filter Z2 (or the second filter Z4) and the first amplifier A1 (or the first amplifier A3), so that the attenuation value of the second attenuator S2 (or the second attenuator S4) can be adjusted so that the second electrical signal that finally enters the first main control unit 11 is within the acceptable range of the first main control unit 11, thereby improving the accuracy of drone detection. .

It should be noted that if the second attenuator (S2, S4) is set after the second amplifier (A2, A4), for example, between the second amplifier (A2, A4) and the second balun (B2, B4), the output signal of the second amplifier (A2, A4) may be distorted due to oversaturation. Therefore, even if the second attenuator (S2, S4) is used to control the power of the distorted electrical signal, the distortion cannot be eliminated. Therefore, the recognition error rate of the drone communication signal by the first main control unit 11 cannot be improved. Before the first amplifier (A1, A3), for example, between the first amplifier (A1, A3) and the receiving antenna (ANT1, ANT2) in the antenna unit 4, the receiving sensitivity of the receiving antenna (ANT1, ANT2) will be affected. In the embodiment of the present invention, by arranging the second attenuator (S2, S4) between the first amplifier (A1, A3) and the second amplifier (A2, A4), it is possible to effectively avoid oversaturation of the output signal of the second amplifier (A2, A4), avoid the second electrical signal input to the first main control unit 11 not being within the acceptable signal range of the first main control unit 11, and avoid affecting the receiving sensitivity of the receiving antenna (ANT1, ANT2).

Further, in the receiving paths 22 and 24, the first amplifier is preferably a low noise amplifier, and as shown in FIG2, the first amplifier A1 (or the first amplifier A3) is preferably a low noise amplifier. Since the first amplifier A1 (or the first amplifier A3) is a device for amplifying the electrical signal for the first time in the receiving path (22, 24), the embodiment of the present invention uses a low noise amplifier as the first amplifier (A1, A3), which can make the introduced noise lower while performing the initial amplification of the electrical signal output by the receiving antenna (ANT1, ANT2), thereby ensuring that the noise of the subsequent electrical signal will not be too large.

Further, the main control unit 1 can also be connected to the second attenuator (S2, S4), and the main control unit 1 is also used to adjust the attenuation of the second attenuator (S2, S4) so that the signal amplitude of the second electrical signal received by the main control unit 1 can be within the preset amplitude range. For example, as shown in FIG2, the first main control unit 11 can also be connected to the second attenuator S2 (or the second attenuator S4), and the first main control unit 11 is also used to adjust the attenuation of the second attenuator S2 (or the second attenuator S4) so that the signal amplitude of the second electrical signal received by the first main control unit 11 is within the preset amplitude range.

It should be understood that in some other embodiments, the transmitter U1 and the receiver U2 can be integrated into a transceiver, and similarly, the transmitter U3 and the receiver U4 can be integrated into another transceiver, that is, the transmitter U1 and the receiver U2 can be implemented using one transceiver, and the transmitter U3 and the receiver U4 can be implemented using another transceiver.

In one embodiment, in the RF unit 3, the RF unit 3 includes two sub-RF units, as shown in FIG2, wherein one sub-RF unit includes a power amplifier PA1, and the other sub-RF unit includes a power amplifier PA2. The power amplifier PA1 is connected to the transmitting path 21, and the power amplifier PA2 is connected to the transmitting path 23. It should be understood that the number of RF sub-units in other embodiments may be one or more than two, and the number of transmitting paths and transmitting antennas 41 may also be equal to the number of sub-RF units. The same, moreover, all transmission paths are connected one-to-one with all sub-RF units, and all sub-RF units are connected one-to-one with all transmitting antennas 41. In other words, a corresponding transmission path, a sub-RF unit, and a transmitting antenna constitute a transmission path, and there are multiple transmission paths. In this way, the main control unit 1 can output multiple different counter signals to multiple transmission paths respectively, and each transmission path can output its own connected counter signal to the corresponding transmitting antenna 41 after passing through the connected sub-RF unit, so that SDR interference to multiple drones can be achieved simultaneously through multiple transmission paths. For example, when the main control unit 1 recognizes that there are currently two or more drone communication signals, it can choose to simultaneously transmit two (or more) different counter signals according to actual needs.

Referring to Figures 2 to 4, in the antenna unit 4, the antenna unit 4 may include two transmitting antennas 41, as shown in Figures 2 to 4, wherein one transmitting antenna 41 includes a first transmitting antenna ANT3 and is used to transmit a counter signal of 2.4 GHZ, and the other transmitting antenna 41 may include a second transmitting antenna ANT4 and is used to transmit a counter signal of 5.8 GHZ. It should be noted here that, since the most commonly used communication frequency bands for drones are currently 2.4 GHZ and 5.8 GHZ, the embodiment of the present invention transmits counter signals of these two frequency bands, and can at least ensure the counter effect of the drone counter circuit of the present invention on these two main frequency bands when the number of drones is large. It should be understood that in other embodiments, the number of transmitting antennas 41 may also be more than two, and may include at least one first transmitting antenna ANT3 for transmitting a counter signal of 2.4 GHZ, and at least one second transmitting antenna ANT4 for transmitting a counter signal of 5.8 GHZ.

In the antenna unit 4 of this embodiment, the antenna unit 4 also includes two receiving antennas 42, including a first receiving antenna ANT1 and a second receiving antenna ANT2. Among them, the first receiving antenna ANT1 is connected to the receiving path 22 correspondingly, and the second receiving antenna ANT2 is connected to the receiving path 24 correspondingly. Moreover, the first receiving antenna ANT1 can be an omnidirectional receiving antenna, and the second receiving antenna ANT2 can be a directional receiving antenna. Since the directional receiving antenna has the advantage of long detection distance in the radiation direction of its main lobe, and the omnidirectional receiving antenna has the advantage of a reconnaissance range of up to 360 degrees, in this embodiment, the UAV countermeasure circuit can quickly detect UAVs located at a long distance in the main lobe radiation direction of the directional receiving antenna by utilizing the advantages of the directional receiving antenna, thereby improving the reconnaissance efficiency, and can also perform real-time reconnaissance of UAVs within a range of 360 degrees by utilizing the advantages of the omnidirectional receiving antenna, thereby realizing the duty function. It should be understood that in other embodiments, the number of receiving antennas 42 and receiving paths may be more than two, and at least one receiving antenna 42 is an omnidirectional receiving antenna, and at least one receiving antenna 42 is a omnidirectional receiving antenna. Of course, in some other embodiments, the number of receiving paths and receiving antenna 42 can be one respectively, and the receiving antenna 42 is an omnidirectional receiving antenna or a directional receiving antenna.

The working principle of the drone countermeasure circuit of this embodiment is explained below in conjunction with FIG. 2 .

During the signal reception process, the receiving antenna 42 in the antenna unit 4 can receive electromagnetic wave signals in the air, and can convert the electromagnetic wave signals into electrical signals and output them to the baseband unit 2. In the baseband unit 2, the signals are processed by the corresponding functional modules and then output to the first main control unit 11 (such as FPGA U5). The first main control unit 11 uses a preset software algorithm to identify whether the processed electrical signal contains a drone communication signal, and then the first main control unit 11 or the second main control unit 12 decodes the drone communication signal to obtain relevant drone information.

This embodiment has two receiving paths that can work simultaneously. The following takes the receiving path 22 corresponding to the first receiving antenna ANT1 as an example to explain the functions of the corresponding functional modules in the receiving path during the signal receiving process. The first amplifier A1 amplifies the electrical signal output by the first receiving antenna ANT1 and outputs it to the second attenuator S2. The second attenuator S2 attenuates the electrical signal and outputs it to the second filter Z2. The second filter Z2 filters the electrical signal and outputs it to the second amplifier A2, so that the second amplifier A2 amplifies the electrical signal again and outputs it to the receiving end of the receiver U2 through the second balun B2. The receiver U2 performs analog-to-digital conversion and demodulation on the electrical signal and then outputs it to the first main control unit 11. It should be understood that the functions of each functional module in the receiving path 24 can refer to the above description and will not be repeated here.

When scouting UAVs, the two receiving paths 22 and 24 can work simultaneously. The directional receiving antenna has the advantage of long detection distance in the radiation direction of its main lobe, and the omnidirectional receiving antenna has the advantage of a reconnaissance range of up to 360 degrees. In the embodiment of the present invention, the respective advantages of the directional receiving antenna and the omnidirectional receiving antenna are simultaneously utilized, so that not only UAVs located at a long distance in the radiation direction of the main lobe of the directional receiving antenna can be quickly detected, but also a duty function of real-time detection of whether a UAV appears within a 360-degree range can be realized.

In the above working process, the first main control unit 11 can also be electrically connected to the second attenuator S2 (second attenuator S4) respectively to control the signal attenuation amplitude of the second attenuator S2 (second attenuator S4) according to the signal amplitude of the received second electrical signal. For example, the stronger the signal strength of the second electrical signal, the greater the signal attenuation amplitude of the second attenuator S2 (second attenuator S4), so as to ensure that the signal amplitude of the second electrical signal received by the first main control unit 11 is within the range suitable for the first main control unit 11. Within the receiving range, it is beneficial for the first main control unit 11 to process the received signal. In addition, for drone countermeasures, the receiving channel has high requirements for data real-time performance. Therefore, if the first main control unit 11 is an FPGA, because it has a faster data processing speed, using the first main control unit 11 to control the attenuation amplitude of the second attenuator S2 (second attenuator S4) can meet the real-time requirements. In addition, the second attenuator S2 is arranged between the second amplifier A2 and the first amplifier A1, which can prevent the signal saturation of the second amplifier A2. Similarly, the second attenuator S4 is arranged between the second amplifier A4 and the first amplifier A3 to prevent the signal saturation of the second amplifier A4.

During the signal transmission process, the second main control unit 12 (such as CPU U6) can obtain the counter frequency band information currently input by the user or the preset counter frequency band information, and send it to the first main control unit 11, so that the first main control unit 11 uses the preset software algorithm to generate a targeted counter signal according to the counter frequency band information encoding. After the counter signal is processed by the subsequent corresponding transmission path, the transmitting antenna 41 in the antenna unit 4 is driven to generate an electromagnetic wave signal of the corresponding frequency band, so as to achieve communication interference with the drone. Of course, the generation of the counter signal can also be performed by the second main control unit 12.

This embodiment has two transmission paths (21, 23) that can work simultaneously. Here, the transmission path 21 corresponding to the first transmitting antenna ANT3 is taken as an example to illustrate the functions of the corresponding functional modules in the transmission path during the transmission process. The transmitter U1 performs digital-to-analog conversion, modulation, and RF amplification on the received counter-attack signal, and outputs the processed counter-attack signal to the first filter Z1 after passing through the first balun B1. The first filter Z1 filters the counter-attack signal and outputs it to the first attenuator S1. The first attenuator S1 can configure the power of the counter-attack signal to a suitable power according to the current counter-attack requirement, for example, attenuating the original power to a signal with lower power. The first attenuator S1 attenuates the counter-attack signal and transmits it through the first transmitting antenna ANT3. It should be understood that the functions of each functional module in the transmission path 23 can refer to the above description, and will not be repeated here. In addition, the first attenuator S1 (first attenuator S3) can be controlled by the first main control unit 11 or the second main control unit 12 to control the attenuation amount according to the current counter-attack requirement.

It can be seen from the above working principle that the decoding of drone communication signals and the generation of counter signals can be determined by the software algorithm in the first main control unit 11 or the second main control unit 12, that is, the SDR (software radio) technology is adopted in the first main control unit 11 or the second main control unit 12. Therefore, the software algorithm in the first main control unit 11 or the second main control unit 12 can be designed to enable the first main control unit 11 or the second main control unit 12 to define counter signals of different modes according to different counter requirements, thereby improving the configurability of the counter signal flexibility. The software algorithm in the unit 11 or the second main control unit 12 is upgraded to achieve the effects of improving the countermeasure performance, improving the signal decoding efficiency, etc., without making major changes to the hardware circuit of the drone countermeasure circuit, making the upgrade of the countermeasure system more convenient and efficient.

FIG3 is a schematic diagram of a third circuit module of an embodiment of the drone countermeasure circuit of the present invention. The difference between the drone countermeasure circuit of this embodiment and the embodiment shown in FIG2 is that the drone countermeasure circuit of this embodiment further includes an additional unit 5 respectively connected to the main control unit 1, and the additional unit includes an alarm component 51 and a display component 52. Specifically, the alarm component 51 and the display component 52 can be respectively connected to the second main control unit 12 (for example, CPU U6) in the main control unit 1. Among them, the alarm component 51 is used to issue an alarm prompt under the control of the main control unit 1 when the main control unit 1 obtains drone information, for example, outputting an alarm prompt in the form of sound, light, electricity, vibration, etc., to prompt the operator that a drone has been detected. The display component 52 is used to display the drone information under the control of the main control unit 1 when the main control unit 1 obtains the drone information, such as the frequency band of the drone communication signal, the location of the drone, the distance between the drone and the device where the drone counter circuit is located, the pitch angle between the drone and the device where the drone counter circuit is located, etc., so that the operator can decide whether to transmit the counter signal, configure the frequency band of the counter signal, etc. according to the displayed drone information, so as to achieve auxiliary strikes, thereby improving the effect of countering the drone. Of course, the additional unit 5 of the drone counter circuit in the embodiment of the present invention can also further include an input component (not shown in the figure) connected to the main control unit 1 (for example, connected to the second main control unit 12), which can be used to receive the communication frequency band of the drone to be countered input by the user, and send it to the main control unit 1 as the frequency band of the counter signal, so that the main control unit 1 can generate the counter signal corresponding to the counter frequency band. In another optional embodiment, the input component and the display component 52 can be integrated into a user interaction component, and the user interaction component can be implemented by, for example, a touch display screen.

FIG4 is a schematic diagram of the fourth circuit module of the drone countermeasure circuit of the present invention. The difference between the drone countermeasure circuit of this embodiment and the embodiment shown in FIG3 is that the additional unit 5 of the drone countermeasure circuit of this embodiment further includes a data interface 53 connected to the main control unit 1. The data interface 53 is used to output the accessed data to the main control unit 1 to update the software algorithm in the main control unit 1. In this way, the countermeasure effect, decoding efficiency, etc. can be improved by upgrading the software algorithm without replacing the components in the hardware circuit. Therefore, the system upgrade can be realized more conveniently and efficiently. In addition, the data interface 53 can be, for example, a micro USB interface or a USB Type-C interface, etc., and the present invention The second main control unit 12 can be electrically connected to the data interface 53, so that the operator can write a new software algorithm to the second main control unit 12 through the data interface 53, and then the second main control unit 12 communicates with the first main control unit 11 to implement the software algorithm upgrade in the first main control unit 11 and the second main control unit 12. Of course, the above upgrade method is only an example, and the specific algorithm upgrade method in the first main control unit 11 and the second main control unit 12 is not limited in this solution.

It should be noted that the embodiment of Figure 3 shows a case where the additional unit 5 includes an alarm component 51 and a display component 52, and the embodiment of Figure 4 shows a case where the additional unit 5 includes an alarm component 51, a display component 52, and a data interface 53. In other optional embodiments, the additional component 5 may include any one of the alarm component 51, the display component 52, and the data interface 53 (not shown in the figure), or the additional unit 5 may also include the alarm component 51 and the data interface 53 (not shown in the figure), or the additional unit 5 may also include the display component 52 and the data interface 53 (not shown in the figure).

The present invention also constructs a drone countermeasure device, which includes a drone countermeasure circuit. The circuit module diagram of the drone countermeasure circuit can be referred to as described above and will not be repeated here.

The above description includes examples of one or more embodiments. Of course, it is impossible to describe all possible combinations of components or methods for the purpose of describing the above embodiments, but it should be recognized by those skilled in the art that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to cover all such changes, modifications and variations that fall within the scope of protection of the appended claims. In addition, with respect to the term "comprising" used in the specification or claims, the word is covered in a manner similar to the term "including", as explained by "including" used as a transitional word in the claims. In addition, any term "or" used in the specification of the claims is intended to mean "non-exclusive or".

The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application is The appended claims shall prevail.

Claims (19)

A drone countermeasure circuit includes a main control unit, a baseband unit, a radio frequency unit and an antenna unit, wherein the antenna unit includes a receiving antenna and a transmitting antenna; the baseband unit includes a receiving path and a transmitting path, and the radio frequency unit is connected to the transmitting antenna; The receiving antenna is used to receive an electromagnetic wave signal and convert the electromagnetic wave signal into a first electrical signal; The receiving path is connected to the receiving antenna and is used to perform signal processing on the first electrical signal to obtain a second electrical signal; The main control unit is connected to the receiving path and is used to obtain drone information according to the second electrical signal and generate a countermeasure signal according to the drone information based on a preset software algorithm; The transmission path is connected to the main control unit and the radio frequency unit respectively, and is used to process the counter signal and output the processed signal to the transmission antenna through the radio frequency unit for transmission. The drone countermeasure circuit according to claim 1 is characterized in that the main control unit includes a first main control unit and a second main control unit connected to each other, and the first main control unit is also connected to the receiving path and the transmitting path, wherein: The first main control unit is used to identify the drone communication signal in the second electrical signal; The first main control unit or the second main control unit is used to obtain drone information according to the drone communication signal based on a preset software algorithm, and generate the counter signal according to the drone information. The drone countermeasure circuit according to claim 1 is characterized in that the RF unit includes at least two sub-RF units, the number of the transmitting paths and the transmitting antennas is the same as the number of the sub-RF units, all the transmitting paths are connected one-to-one to all the sub-RF units, and all the sub-RF units are connected one-to-one to all the transmitting antennas. The drone countermeasure circuit according to claim 1 is characterized in that the number of the receiving path and the receiving antenna is one, and the receiving antenna is an omnidirectional receiving antenna or a directional receiving antenna; or, The number of the receiving paths and the receiving antennas are both at least two, and all the receiving paths One-to-one connection is made with all the receiving antennas, wherein at least one of the receiving antennas is an omnidirectional receiving antenna and at least one of the receiving antennas is a directional receiving antenna. The drone countermeasure circuit according to claim 1, characterized in that the drone countermeasure circuit further comprises at least one of the following: A data interface, connected to the main control unit, for outputting the received data to the main control unit to update the software algorithm in the main control unit; A display component, connected to the main control unit and used to display the drone information under the control of the main control unit; The alarm component is connected to the main control unit and is used to issue an alarm prompt under the control of the main control unit when the main control unit obtains the drone information. The drone countermeasure circuit according to claim 1 is characterized in that the transmission path includes a transmitter, a first balun, and a first filter connected in sequence, and the input end of the transmitter is connected to the main control unit, and the output end of the first filter is connected to the radio frequency unit. The drone countermeasure circuit according to claim 6, characterized in that the transmitting path further comprises: A first attenuator is connected between an output end of the first filter and the radio frequency unit. The drone countermeasure circuit according to claim 1 is characterized in that the receiving path includes a receiver, a second balun, a second filter, and a first amplifier connected in sequence, and the input end of the first amplifier is connected to the receiving antenna, and the output end of the receiver is connected to the main control unit. The drone countermeasure circuit according to claim 8, characterized in that the first amplifier is a low noise amplifier. The drone countermeasure circuit according to claim 8 is characterized in that the receiving path also includes a second amplifier connected between the second filter and the second balun. The drone countermeasure circuit according to claim 10 is characterized in that the receiving path also includes a second attenuator connected between the second filter and the first amplifier. The drone countermeasure circuit according to claim 11 is characterized in that the main control unit is also connected to the second attenuator, and the main control unit is also used to adjust the attenuation degree of the second attenuator so that the signal amplitude of the second electrical signal received by the main control unit is within a preset amplitude range. The drone countermeasure circuit according to claim 12 is characterized in that the main control unit includes a first main control unit, and the first main control unit is also connected to the receiving path and the transmitting path; the first main control unit is an FPGA; The first main control unit is also connected to the second attenuator, and the first main control unit is further used to adjust the attenuation degree of the second attenuator so that the signal amplitude of the second electrical signal received by the main control unit is within a preset amplitude range. The drone countermeasure circuit according to claim 7 is characterized in that the main control unit is also connected to the first attenuator, and the main control unit is used to control the attenuation of the first attenuator according to the countermeasure requirement. A drone countermeasure device comprises a drone countermeasure circuit; the drone countermeasure circuit comprises a main control unit, a baseband unit, a radio frequency unit and an antenna unit, wherein the antenna unit comprises a receiving antenna and a transmitting antenna; the baseband unit comprises a receiving path and a transmitting path, and the radio frequency unit is connected to the transmitting antenna; The receiving antenna is used to receive an electromagnetic wave signal and convert the electromagnetic wave signal into a first electrical signal; The receiving path is connected to the receiving antenna and is used to perform signal processing on the first electrical signal to obtain a second electrical signal; The main control unit is connected to the receiving path and is used to obtain drone information according to the second electrical signal and generate a countermeasure signal according to the drone information based on a preset software algorithm; The transmission path is connected to the main control unit and the radio frequency unit respectively, and is used to process the counter signal and output the processed signal to the transmission antenna through the radio frequency unit for transmission. The drone countermeasure device according to claim 15 is characterized in that the transmission path includes a transmitter, a first balun, a first filter, and a first attenuator connected in sequence, and the input end of the transmitter is connected to the main control unit, and the output end of the first attenuator is connected to the RF unit. The drone countermeasure device according to claim 16 is characterized in that the main control unit is also connected to the first attenuator, and the main control unit is used to control the attenuation amount of the first attenuator according to the countermeasure requirements. The drone countermeasure device according to claim 15 is characterized in that the receiving path includes a receiver, a second balun, a second amplifier, a second filter, a second attenuator, and a first amplifier connected in sequence, and the input end of the first amplifier is connected to the receiving antenna, and the output end of the receiver is connected to the main control unit. The drone countermeasure device according to claim 18 is characterized in that the main control unit is also connected to the second attenuator, and the main control unit is also used to adjust the attenuation degree of the second attenuator so that the signal amplitude of the second electrical signal received by the main control unit is within a preset amplitude range.