CN111129775A

CN111129775A - Method for realizing fast wave beam control

Info

Publication number: CN111129775A
Application number: CN201911387289.6A
Authority: CN
Inventors: 刘俊飞; 苏保禹; 周健; 侯云飞; 何俊辉; 高祺; 田弘博; 王天宇
Original assignee: 8511 Research Institute of CASIC
Current assignee: 8511 Research Institute of CASIC
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2020-05-08

Abstract

The invention discloses a method for realizing rapid beam control, which belongs to the field of electronic countermeasure and comprises the following steps: according to frequency and angle information sent by an upper computer, carrying out T component directional diagram test to obtain an initial phase error after calibration, then calculating corresponding phase shift codes according to the digit N of the phase shifter, and sending 2 according to T component sequence per frame^NAnd when the number of the issued phase shift codes is accumulated to one sector of the data FLASH, all the phase shift code information is uniformly programmed to the data FLASH. And when the T component needs to be controlled, searching the phase shift code of the beam lookup table according to the frequency and angle information, and issuing the phase shift code. The invention overcomes the problems of long time consumption and poor portability existing in the traditional beam control.

Description

Method for realizing fast wave beam control

Technical Field

The invention belongs to the field of electronic countermeasure, and particularly relates to a method for realizing rapid beam control.

Background

With the development of technologies such as radar, electronic warfare, and communication, phased arrays have become mainstream in the above fields. The beam control system is an important component of the phased array radar and the phased array jammer, provides correct phase shift codes for phased array antenna scanning, and enables beam pointing to be rapidly and flexibly switched. The phased array antenna realizes high-speed electronic control scanning of antenna beams by using the digital phase shifter, fully utilizes the antenna beam scanning to quickly and reasonably distribute energy, and can conveniently realize the change of the beam direction without mechanical scanning of the antenna.

Early wave control systems are generally realized by hardware circuits, and the realization method has the defects of large equipment quantity, inflexibility, difficulty in realizing complex calculation of beams and difficulty in meeting special requirements. Later, a single chip microcomputer and a DSP chip are adopted to design a wave control system, but the single chip microcomputer and the DSP are serial operation instructions, namely, wave control code calculation and phase distribution cannot be carried out on each antenna unit channel in parallel. Aiming at the characteristics that a wave control system requires high-speed calculation and multi-channel parallel logic control, the FPGA is selected as a core processor of the wave control system, and high-speed parallel calculation of wave control codes and parallel synchronous control of each unit channel are realized.

Disclosure of Invention

The invention aims to provide a method for realizing rapid beam control, which overcomes the problems of long time consumption and poor portability of the traditional beam control.

The technical solution for realizing the purpose of the invention is as follows: a method for realizing fast beam control comprises the following steps:

step 1, carrying out T assembly directional diagram test according to externally input beam pointing information and frequency to obtain an initial phase error after calibration;

step 2, calculating corresponding phase-shifting codes according to the digit N of the phase shifter;

step 3, issuing 2 according to the T component sequence each frame^NPhase shift code information;

step 4, when the number of the issued phase shift codes is one sector of the data FLASH, uniformly programming all the phase shift code information to the data FLASH;

and 5, when the T component needs to be controlled, searching the phase shift code of the beam lookup table according to the frequency and angle information, and issuing the T component in the corresponding direction.

Compared with the prior art, the invention has the remarkable advantages that: 1) the real-time calculation time is saved after the pre-calibration; 2) the real-time performance of reading the phase-shifting code by looking up the table is greatly improved; 3) the portability is strong, and the burn-in wave control code can be transplanted for use only by recalibrating.

Drawings

Fig. 1 is a flowchart of a fast beam control implementation method according to the present invention.

Detailed Description

The present invention is described in further detail below with reference to the attached drawing figures.

The object of the invention is to achieve a fast switching of the beam in electrical interference. In multi-target countermeasure, a pulse sequence method is often adopted to manage interference radio frequency pulses to be transmitted, and for this reason, a phased array electronic countermeasure system needs to perform real-time beam control according to current pulse description. At the moment, the loss rate of the interference pulse depends on the beam control speed, so that the faster the beam switching of the beam control is, the lower the pulse loss number is, the more the multi-target electronic antagonistic performance is favorably exerted, and the requirement of engineering application is met.

With reference to fig. 1, a method for implementing fast beam control according to the present invention includes the following steps:

step 1, carrying out T component directional diagram test according to externally input beam pointing information and frequency to obtain an initial phase error after calibration:

in order to obtain the initial phase difference of each channel, a calibration instruction is issued, the calibration instruction comprises tests under different channels with different frequencies, and corresponding data are obtained;

according to

Generating the ith channel relative to the referencePhase difference of channels

Wherein d is₁Is the distance between adjacent antenna elements in the horizontal direction, λ is the wavelength, θ is the azimuth angle, δ_iIs the initial phase error between the i-th cell channel and the reference cell.

Step 2, according to the digit N of the phase shifter, calculating the corresponding phase shift code C (i):

step 4, receiving the phase shift codes and caching the phase shift codes to an internal temporary space, and programming all the phase shift codes to a FLASH sector when the number of the phase shift codes is accumulated to one sector data volume of the FLASH:

step 41, receiving the phase shift code and caching the phase shift code to an internal temporary space;

and 42, programming all the phase shift codes to the designated sector of the FLASH when the data amount of one sector of the FLASH is accumulated.

And 5, when the T component needs to be controlled, looking up the table according to the issued frequency and angle information, finding out the corresponding phase-shifting code and issuing the phase-shifting code.

The present invention is described in further detail below with reference to examples:

example (c):

setting an input frequency step of 100M, d at 6-18GHz₁10mm, and the phase shifter bit number N is 6; the method comprises the following specific steps:

step 1, an upper computer sends a calibration instruction, and phase differences under frequency points of 6GHz, 10GHz, 12GHz and 16GHz are selected;

step 11, the upper computer issues a calibration instruction to perform 100M interval calibration work at 6-18 GHz;

step 12, according to

Obtaining phase differences corresponding to frequency points of 6GHz, 10GHz, 12GHz and 16GHz as shown in a table 1, and performing quantization processing as shown in a table 2;

TABLE 1 typical phase differences under frequency (16 of them are selected)

TABLE 2 phase difference quantization values at typical frequencies (16 of them are selected)

Step 2, calculating corresponding phase-shifting codes C (i) according to the digit N of the phase shifter, wherein N is 6;

step 21, calculating according to the quantization digit N of the phase shifter

Further, the phase shift codes corresponding to the frequency points of 6GHz, 10GHz, 12GHz, and 16GHz are obtained, as shown in table 3.

TABLE 3 phase-shifting code at typical frequency (16 of them are selected)

Step 3, issuing 2 according to the T component sequence each frame^N(64) Phase shift code information.

And 4, burning the FLASH sector when the phase-shifting code is cached to the size (1Mbyte) of one FLASH sector.

The format of the stored data in FLASH is as follows:

serial number	Name (R)	Data type	Number of bytes	Value range
					1	Channel number	unsigned char	1	[0，15]
2	Frequency of	unsigned short	2	[6000，18000]
					3	Phase shift code 0	unsigned char	1	Low 6bit effective
	...
					66	Phase shift code 63	unsigned char	1	Low 6bit effective

And 5, looking up a table according to the issued frequency and angle information, finding out a corresponding phase-shifting code and issuing the phase-shifting code.

When table look-up is needed, the content in the FLASH is read into an internal cache space, then comparison is carried out according to the issued frequency and angle, and the required phase shift code is selected and issued.

Compared with an algorithm for calculating the phase difference in real time and then calculating the phase-shifting code, the table look-up method provided by the patent is high in speed, small in occupied resource and wide in applicable scene. And the programming can be simplified by means of pre-calculation and burning search, and meanwhile, the method is strong in universality and can be applied to beam control in different scenes.

Claims

1. A method for realizing fast beam control is characterized by comprising the following steps:

step 2, calculating corresponding phase shift codes according to the digit N of the phase shifter;

step 3, issuing 2 according to T component specific sequence each frame^NPhase shift code information;

step 4, when the number of the issued phase shift codes is one sector of the data FLASH, uniformly programming the phase shift code information to the data FLASH;

and 5, when the T component needs to be controlled, searching the phase shift code of the beam lookup table according to the frequency and angle information, and issuing the phase shift code.

2. The method for implementing fast beam steering according to claim 1, wherein step 1 is a split T-module pattern test, specifically as follows:

sequentially issuing calibration instructions to tests under different channels with different frequencies by using an upper computer

Phase difference relative to reference channel

3. The method as claimed in claim 1, wherein step 2 calculates the corresponding phase shift code for the bit number N of the phase shifter, specifically as follows:

according to the digit N of the phase shifter, calculating the corresponding phase shift code C (i)

Wherein d is₁Is the distance between adjacent antenna elements in the horizontal direction, λ is the wavelength, θ is the azimuth angle, δ_iIs the initial phase error between the i-th cell channel and the reference cell. .

4. The method according to claim 1, wherein step 4 is implemented by uniformly programming all phase shift code information to the data FLASH when the number of the issued phase shift codes is one sector of the data FLASH, and specifically includes the following steps: