CN118216903A - Height measuring device and height measuring method based on millimeter wave radar - Google Patents
Height measuring device and height measuring method based on millimeter wave radar Download PDFInfo
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Abstract
The application provides a height measuring device and a height measuring method based on millimeter wave radar, wherein the height measuring device based on millimeter wave radar comprises: the millimeter wave radar module and the wake-up module are respectively connected with the main controller; the wake-up module is used for activating the millimeter wave radar module through the main controller, and the millimeter wave radar module is used for sending a transmitting signal and receiving an echo signal transmitted by the head of the human body when the transmitting signal touches the head of the human body so as to obtain an intermediate frequency signal according to the transmitting signal and the echo signal; and the main controller is used for obtaining the height of the human body according to the intermediate frequency signal corresponding to the highest point of the head of the human body through continuous millimeter wave frequency sweeping. The application is additionally provided with the wake-up module, adopts the millimeter wave radar technology to form a new architecture for measuring the height of the human body, and activates the millimeter wave radar module to work when the height measurement is needed, thereby realizing the measurement of the height of the human body. Not only realizing non-contact and high-precision measurement of the height of the human body, but also reducing the energy consumption of the device for measuring the height of the human body.
Description
Technical Field
The application relates to the technical field of frequency modulation continuous wave ranging, in particular to a height measuring device and a height measuring method based on millimeter wave radar.
Background
The altimeter existing in the market at present mainly has two modes of contact type and ultrasonic non-contact type to realize the altimetry, and the human body altimeter is limited by the contact property and the environmental condition of the measuring instrument, so that the problems of inconvenience, insufficient detection precision, external interference and the like exist.
As conventional height measurement methods typically require contact measurements, additional tools or equipment are typically required, increasing the inconvenience of use, especially in situations where frequent height monitoring is required, and increasing energy consumption. For another example, in practical application, the ultrasonic frequency is generally 20-60 Khz, so that the altimeter is easily interfered by factors such as propagation medium, temperature, surrounding environment and the like in practical application, the stability of a measurement result is affected, the energy consumption is increased, and the resource waste is caused.
Thus, a new body height measurement scheme is needed.
Disclosure of Invention
In view of this, the embodiments of the present disclosure provide a height measurement device and a height measurement method based on millimeter wave radar.
The embodiment of the specification provides the following technical scheme:
the application provides a height measuring device based on millimeter wave radar, comprising: the device comprises a millimeter wave radar module, a main controller and a wake-up module;
The wake-up module and the millimeter wave radar module are both connected with the main controller;
the wake-up module is used for activating the millimeter wave radar module through the main controller so as to enable the millimeter wave radar module to be converted into a working state from a dormant state;
the millimeter wave radar module is used for sending a transmitting signal in a working state and receiving an echo signal transmitted by the head of a human body when the transmitting signal touches the head of the human body so as to obtain an intermediate frequency signal according to the transmitting signal and the echo signal;
And the main controller is used for obtaining the height of the human body according to the intermediate frequency signal corresponding to the highest point of the head of the human body through continuous millimeter wave frequency sweeping.
The application also provides a height measurement method based on the millimeter wave radar, which comprises the following steps:
The wake-up module detects whether a human body exists in a preset space range or not in the environment, and if so, the millimeter wave radar module is activated through the main controller so as to be in a working state; if not, the master controller does not activate the millimeter wave radar module so that the millimeter wave radar module is always in a dormant state;
The millimeter wave radar module carries out frequency modulation signals emitted by radar to the head of a human body standing below and receives echo signals reflected by the emitted signals;
the millimeter wave radar module mixes the echo signal with the frequency modulation signal to obtain an intermediate frequency signal;
And the main controller obtains the height of the human body by calculating the distance between the head of the human body and the radar according to the intermediate frequency signal.
Compared with the prior art, the beneficial effects that above-mentioned at least one technical scheme that this description embodiment adopted can reach include at least:
The application provides a human body height measurement mode based on millimeter wave radar technology, which is characterized in that a wake-up module is additionally arranged, and the wake-up module and the millimeter wave radar module are both connected with a main controller to form a new framework for human body height measurement. The wake-up module activates the millimeter wave radar module through the main controller, namely activates the millimeter wave radar module to work when the height of the human body is measured, so that unnecessary energy consumption is reduced. When a human body stands below the height measuring device, the millimeter wave radar module and the main controller are adopted to measure the height of the human body by utilizing the millimeter wave radar technology. Not only realizing the non-contact and high-precision measurement of the height of the human body, but also reducing the energy consumption of the whole body height measuring device, and only activating the millimeter wave radar module to work during measurement. The application provides a high-efficiency, accurate and user-friendly measurement scheme, and provides an advanced human body height measurement technical solution for the fields of medical treatment, business, household use and the like.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram I of a height measuring device based on millimeter wave radar provided by the application;
FIG. 2 is a schematic diagram II of a height measuring device based on millimeter wave radar;
FIG. 3 is a schematic diagram III of a height measurement device based on millimeter wave radar;
fig. 4 is a schematic diagram of a millimeter wave radar chip provided by the application;
FIG. 5 is a schematic diagram of an internal module in a millimeter wave radar height measurement device provided by the application;
FIG. 6 is a flow chart of a height measurement method of a millimeter wave radar provided by the application;
Fig. 7 is a flowchart of activating a millimeter wave radar module provided by the present application;
FIG. 8 is a schematic diagram of a millimeter wave radar height measurement process according to the present application.
Detailed Description
Embodiments of the present application will be described in detail below with reference to the accompanying drawings.
Other advantages and effects of the present application will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present application with reference to specific examples. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. The application may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present application. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It is noted that various aspects of the embodiments are described below within the scope of the following claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the present disclosure, one skilled in the art will appreciate that one aspect described herein may be implemented independently of any other aspect, and that two or more of these aspects may be combined in various ways. For example, apparatus may be implemented and/or methods practiced using any number and aspects set forth herein. In addition, such apparatus may be implemented and/or such methods practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
It should also be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present application by way of illustration, and only the components related to the present application are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.
In addition, in the following description, specific details are provided in order to provide a thorough understanding of the examples. However, it will be understood by those skilled in the art that the present invention may be practiced without these specific details.
The height measuring instrument of the height of the human body at present is mainly realized by adopting two modes of contact type and ultrasonic non-contact type. In which, the conventional height measurement method generally requires contact measurement, and generally requires additional tools or devices, which increases inconvenience in use, particularly in the case where height monitoring is required frequently, and increases energy consumption. In the prior ultrasonic ranging equipment, the ultrasonic frequency is generally 20-60 Khz in practical application, and the altimeter is easily interfered by factors such as propagation medium, temperature, surrounding environment and the like in practical application, so that the stability of a measurement result is affected, the measurement energy consumption is increased, and unnecessary waste of resources is caused. In a word, the existing human body height measurement is limited by the contact and environmental conditions of the measuring instrument, and has the problems of inconvenience, insufficient detection precision, external interference and the like, so that the measurement is limited and the energy consumption is increased.
Based on this, the embodiment of the present specification proposes a processing scheme: based on the characteristics of high frequency, high precision, interference resistance and the like of the millimeter wave radar technology, a wake-up module is additionally arranged, so that the wake-up of the millimeter wave radar module is realized, and the millimeter wave radar module is converted into a working state from a dormant state. The millimeter wave radar module and the wake-up module are connected with the main controller to form a new architecture for measuring the height of the human body, and the millimeter wave radar module is activated through the wake-up module, so that when the human body stands below the height measuring device, the millimeter wave radar module is activated to work when the height of the human body is measured, and the height of the human body is measured through the millimeter wave radar module and the main controller. Not only overcomes the defects of the traditional measurement method, but also provides a more reliable measurement solution for the height of the human body. The energy consumption of the human height measuring device is reduced, namely, the millimeter wave radar module is activated to work when the human height is measured, so that the energy consumption is saved.
The following describes the technical scheme provided by each embodiment of the present application with reference to the accompanying drawings.
As shown in fig. 1, an embodiment of the present specification provides a height measurement device based on millimeter wave radar, including: millimeter wave radar module (including such as radar signal transceiver, radar signal processing etc. submodule), main control unit and wake-up module. The wake-up module and the millimeter wave radar module are connected with the main controller.
The wake-up module is used for activating the millimeter wave radar module to work under specific conditions, and the specific conditions mean that when the millimeter wave radar module can be used for measuring the height of a human body, the wake-up module can acquire the human body in different modes, so that the millimeter wave radar module is converted from a dormant state to a working state when the height of the human body is tested, and the millimeter wave radar module is converted from the dormant state to the working state to work when necessary. The millimeter wave radar module is always in a dormant state when not working, so that the millimeter wave radar module is only in a working state when needed, the problem that the millimeter wave radar is always working and causes energy consumption is solved effectively due to the fact that the millimeter wave radar module is always in a height measurement working state and high in power consumption is avoided.
The millimeter wave radar module sends a transmitting signal in a working state, and receives an echo signal transmitted by the transmitting signal touching the head of the human body, so that an intermediate frequency signal is obtained according to the transmitting signal and the echo signal. And the main controller is used for obtaining the height of the human body according to the intermediate frequency signal corresponding to the highest point of the head of the human body through continuous millimeter wave frequency sweeping.
The main controller adopts FMCW (Frequency Modulated Continuous Wave ) ranging principle to realize the measurement of the height of the human body.
Specifically, radar ranging techniques based on frequency modulated continuous millimeter wave signals. The basic principle of the concrete implementation is as follows: the FMCW radar transmits a frequency modulated signal to a target area through a transmitting antenna of the radar system, when the transmitting signal encounters a target, part of the energy is reflected by the target, the reflected signal forms an echo signal, the receiving antenna receives the reflected echo signal and mixes with the transmitted frequency modulated signal to obtain an intermediate frequency signal, the frequency of which is equal to the frequency difference of the echo signal, and the frequency difference is related to the distance between the target and the radar. By measuring the frequency of the intermediate frequency signal, the distance between the target and the radar can be calculated, the frequency varying in proportion to the distance of the target. The distance between the target and the radar is calculated using the frequency difference, calculated using the following formula:
wherein: d is distance, c is light speed, Δf is frequency difference, and B is sweep bandwidth
The millimeter wave radar is used for realizing the function of measuring the height, and has the following advantages: 1. high-precision measurement: millimeter-wave radar technology can be used for realizing millimeter-level measurement accuracy, which is far superior to that of the traditional method. 2. Is not disturbed by the environment: the millimeter wave radar technology is not interfered by factors such as ambient illumination, temperature and the like, and the stability and the accuracy of measurement are improved. 3. Contactless design: the application adopts a non-contact design, and a user can finish measurement by only standing below the height measuring device, thereby improving the convenience of use.
Meanwhile, when the millimeter wave radar module needs to work, the wake-up module activates the millimeter wave radar module through the main controller to finally realize height measurement of a human body, so that unnecessary energy consumption of the millimeter wave radar module is avoided, and the problem of high energy consumption caused by the continuous work of the millimeter wave radar module is effectively solved.
Because of the different shapes of the human head, if the head top of the human body is flat, the head top of the human body is pointed (namely, the left and right parts of the head are lower than the middle part). The application utilizes the frequency modulation millimeter wave signal, for example, a human body to be measured stands under the height measuring device, the millimeter wave radar module works, the radar signal transceiver sub-module sends the transmitting signal and receives the echo signal transmitted by the head of the human body when the transmitting signal touches the head of the human body, and then the transmitting signal and the echo signal are processed in the radar signal processing sub-module, in particular, the acquisition of the radar intermediate frequency signal at the highest point of the head of the human body can be realized by utilizing the ADC sampling frequency of the intermediate frequency signal in the prior art, and then the main controller receives the intermediate frequency signal corresponding to the highest point of the head of the human body, and finally the height of the human body is obtained.
According to the application, a millimeter wave radar technology is utilized, a wake-up module is additionally arranged, the wake-up module is connected with the millimeter wave radar module through the main controller to form a new framework for measuring the height of a human body, and when the height of the human body is measured, the wake-up module activates the millimeter wave radar module through the main controller, so that the millimeter wave radar module works, and further, for example, when the human body stands below the height measuring device, the millimeter wave radar module and the main controller are used for measuring the height of the human body. The method not only solves the defects in the traditional height measurement mode, provides a high-efficiency, accurate and user-friendly measurement scheme, but also realizes that the millimeter wave radar module wakes up when needing to work, avoids unnecessary energy consumption, saves energy consumption, and provides an advanced human body height measurement technical solution for the fields of medical treatment, business, household use and the like.
In combination with the above embodiment, the wake-up module includes: the system comprises an infrared pair tube module, a voice wake-up module or a preset second radar. The infrared pair tube module is used for determining that a human body exists in the environment, and the main controller is used for activating the millimeter wave radar module according to a human body existing signal. The voice wake-up module is used for determining wake-up words so as to activate the millimeter wave radar module through the main controller. The second radar is preset to determine that a human body exists in the environment, and the main controller is used for activating the millimeter wave radar module according to the existing human body signals. The second radar such as a low-power-consumption microwave radar sensor is preset, and after detecting the motion of a human body, the second radar passes through the main controller to activate the millimeter wave radar module to carry out the working state of height measurement. Similar to the infrared pair tube module, the working current of the preset second radar is 10uA, the working running current of the preset second radar is 10-200uA, and the working running current can be even as low as microampere level.
Or the wake-up module is arranged in the millimeter wave radar module.
As shown in fig. 2, the wake-up module is an infrared pair tube module, and the infrared pair tube module is connected with the main controller and is used for detecting the existence of a human body in the environment. The main controller is also used for activating the millimeter wave radar module according to the human body signals.
In this embodiment, the infrared pair tube module is used as a wake-up trigger condition of the millimeter wave radar module, and the working principle is based on sensitivity to infrared radiation. The infrared pair tube module is used for sensing infrared radiation in the environment, and the infrared pair tube module generates an electric signal when detecting a target or activity. When the infrared pair tube module detects the existence of a target or activity (such as a human body) in the environment, an electrical signal generated by the infrared pair tube module is transmitted to the main controller. The main controller receives signals of the infrared pair tube module and judges whether the millimeter wave radar needs to be activated or not according to the signal state. The master controller can intelligently decide when to wake up the millimeter wave radar. When the main controller determines that a target or activity (e.g., a human body) exists, the operating state of the millimeter wave radar will be activated. Therefore, the millimeter wave radar is in a working state only when the need is detected, and the problem of energy consumption caused by the continuous working of the millimeter wave radar is effectively solved. Unnecessary energy consumption is avoided.
For another example, when the wake-up module is a voice wake-up module, the main controller is triggered to activate the millimeter wave radar module by analyzing the audio data input by the human body based on the voice wake-up technology and judging that the voice wake-up module can contain specific wake-up words, such as "measure height". The voice wake-up module is used for determining wake-up words, when a human body emits sound as the wake-up words, when the human body emits wake-up words such as 'height measurement', the millimeter wave radar module is activated through the main controller, so that the millimeter wave radar module is converted into a working state from an original dormant state, the problem of energy consumption caused by the fact that the millimeter wave radar always works is solved, and unnecessary energy consumption is avoided.
For another example, the wake-up module is arranged in the millimeter wave radar module, for example, based on a low-power detection mode of the millimeter wave radar, the millimeter wave radar can sweep according to different frame rates, is in a human motion detection mode (namely, a low-power mode) at ordinary times, the millimeter wave radar sweeps according to 4 frames or lower frame rates, and is switched to a height measurement mode after detecting human motion, at the moment, the millimeter wave radar sweeps according to 16 frames or higher frame rates, the sweep bandwidth is wider, and the chirp number contained in each frame is also more. The mode switching is realized by a millimeter wave radar SOC chip. Therefore, the millimeter wave radar module is changed from a dormant state with low energy consumption to a working state, and the millimeter wave radar is in the working state only when needed, so that the problem of energy consumption caused by the continuous working of the millimeter wave radar is effectively solved, and unnecessary energy consumption is avoided.
For another example, the wake-up module may also use other low power radars, such as using other low power microwave radar sensors to detect human motion and wake up the millimeter wave radar into altimetric mode. Compared with the low power consumption of the infrared pair tube, such as the working current of the infrared pair tube is 10uA, the working current of the low power consumption microwave radar sensor is very low, such as 10-200uA, and even can be as low as microampere. Therefore, on the connection structure based on millimeter wave radar module and main control unit, the embodiment of this specification increases the module of awakening, effectively solves the energy consumption problem that the millimeter wave radar worked always and leads to in the human height measurement process, has avoided unnecessary energy consumption.
In combination with the embodiment, each module in the height measuring device based on the millimeter wave radar of the application uses a chip to realize the function of the altimeter. In some embodiments, millimeter wave chips and MCU chips may be used to implement the functions of the millimeter wave radar module and the master controller, respectively. The millimeter wave radar module is arranged on the millimeter wave chip, and the main controller is arranged on the MCU chip.
In other embodiments, the millimeter wave radar module and the master controller are integrated into a millimeter wave radar SOC (System on Chip, abbreviated as System on Chip). If the related processing of the millimeter wave chip and the MCU chip is concentrated to one millimeter wave radar SOC chip, the related control and height processing can be executed in the CPU of the millimeter wave radar SOC.
Specifically, the millimeter wave radar sensing chip AT6010 adopts a mature CMOS (Complementary Metal Oxide Semiconductor ) process, fully utilizes a digital-analog mixing technology, integrates a processor, a millimeter wave transceiver module, a radar intermediate frequency module, radar signal processing and the like on one chip, and realizes a more miniature chip to provide a more miniaturized product design.
The construction diagram of fig. 4 is as follows: 1. the data receiving and collecting module (such as millimeter wave radar module) receives and processes the aerial signal through radio frequency and converts the aerial signal into an intermediate frequency signal, and then converts the analog intermediate frequency signal into a digital signal through an internal ADC and outputs the digital signal to the storage system. 2. And the storage system (such as a storage module corresponding to the main controller) is used for storing the signals received by the storage system and output by the data receiving and collecting module into a memory of the system, so that the subsequent algorithm processing is facilitated. 3. The CPU (such as a main controller, namely an integrated microcontroller) reads radar intermediate frequency data stored in a system memory to perform algorithm processing, including filtering, 1D-FFT/2D-FFT conversion, distance measurement algorithm and the like.
With the combination of the embodiments, when the wake-up module is added to the height measuring device based on the millimeter wave radar module and the main controller, the wake-up module is integrated in the millimeter wave radar chip according to the arrangement of the millimeter wave radar module and the main controller; or the wake-up module is arranged on the MCU chip and is connected with the main controller.
For example, the wake-up module is integrated in a millimeter wave radar SOC chip. For example, the wake-up module comprises an infrared pair tube module, a voice wake-up module or a preset second radar, and the wake-up modules can be arranged on the MCU chip and connected with the main controller. Thereby realizing the new architecture of the height measuring device.
In combination with the above embodiment, the height measurement device based on millimeter wave radar of the present application further includes: the display module is connected with the main controller, so that the display module displays the height of the human body obtained by the main controller. The voice broadcasting module is connected with the main controller, so that the voice broadcasting module broadcasts the height of the human body obtained by the main controller. And the storage module is connected with the main controller so as to store the height data of the human body. Wherein, the connection of each module can refer to that if the corresponding module is integrated in one chip, the connection is integrated connection; if the modules are respectively arranged on the corresponding different chips, the connection is that the modules are mutually and electrically connected.
In combination with fig. 4, the above modules are integrated in a millimeter wave radar chip, and the height measuring device based on millimeter wave radar of the present application is additionally provided with a display module, a voice broadcast module and a storage module, and as shown in fig. 5, the device is divided into an infrared pair tube module (specifically, the wake-up module includes an infrared pair tube module, a voice wake-up module, other low-power radars or a wake-up module disposed in the millimeter wave radar module), a millimeter wave radar module, a main controller and a communication module (such as a wireless transceiver module). In this embodiment, an infrared pair tube module is taken as an example to describe the present embodiment.
Infrared geminate transistor module: the main function is that when the infrared geminate transistors detect that targets or activities exist in the environment, the main controller receives signals of the infrared geminate transistors, judges whether the millimeter wave radar needs to be activated according to the signal state, and realizes the awakening of the millimeter wave radar module. Because the infrared pair pipe module has lower power consumption, the millimeter wave radar module can be always in a working state, and when the infrared pair pipe module detects that a target or activity exists in the environment, the millimeter wave radar module is activated to enter the working state. Similarly, the voice wake-up module and other low-power radars have lower power consumption at ordinary times, always process the working state, and when the human body is detected to send wake-up words or the human body motion is detected, the millimeter wave radar module is activated to enter the working state, and the details are not repeated here.
Millimeter wave radar module: the main functions are radar signal sending and receiving, radar data acquisition and radar signal preprocessing.
And (3) a main controller: the radar signal preprocessing method is mainly characterized in that the radar signal preprocessing method is used for calling a height measurement algorithm for height measurement, control processing, display of height data and other information, calibration and storage of height and other information.
And the wireless receiving and transmitting module is used for: and the mobile terminal equipment is responsible for carrying out data transmission interaction functions with the mobile terminal equipment. And if the WIFI receiving and transmitting module is used, the height measurement data is sent to the mobile terminal through the WIFI module for management. And for example, the Bluetooth transceiver module is used for sending the height measurement data to the mobile terminal for management. And the command interaction module is responsible for data interaction between the WIFI/BT module and the main controller module. As shown in fig. 3, the height calculation result may be transmitted to other modules in a wired manner, or may be transmitted to a mobile device such as a mobile phone, a tablet, etc. in a wireless manner.
Specifically, millimeter wave radar module realizes a. Radar signal receives and dispatches, is equipped with a 60GHz millimeter wave radar chip in this device system, forms the continuous wave signal of frequency modulation with the linear frequency modulation mode through wave form generator signal and launches through radar antenna, meets object (like the human body) transmission and receives the transmission signal through receiving module and carries out the frequency mixing with the transmission signal and produce intermediate frequency signal. In order to improve the height measurement accuracy, the sweep frequency bandwidth configured by the waveform generator is as wide as possible, and the implementation of the invention uses the sweep frequency bandwidth of 5GHz, namely 59-64 GHz. b. The method comprises the steps of radar data acquisition and signal preprocessing, wherein raw data received by a radar include effective signals and ineffective signals including various interferences, a high-low pass filter at the front end of an analog can be used for carrying out signal filtering to carry out preliminary signal processing, and an intermediate frequency signal after the filtering processing is converted into a digital signal through an ADC module to carry out subsequent digital signal processing.
The main controller realizes a height measurement module, and the height measurement module realizes the measurement of the height of the human body by calling a height measurement algorithm library. The height measurement algorithm library has a distance obtained by adopting an FMCW ranging principle, and corresponds to an antenna to human body transmitting antenna, echo signals and intermediate frequency signals, so that the height of the human body is obtained by the intermediate frequency signals. In some embodiments, the above signals from the head of the human body to the antenna are particularly referred to. Or the height measuring module is used for measuring the height of the human body according to the intermediate frequency signal corresponding to the highest point of the head of the human body swept by the continuous millimeter waves. b. The control module realizes control of the altimeter products such as key startup, altimeter calibration and startup measurement, startup of a wake-up key and the like, and the display module can display wireless connection states, height data display, other information display and the like. c. And the storage module is used for storing radar calibration data and other user data.
The height measuring device based on millimeter wave radar, namely the height measuring instrument has the functions of screen display and voice broadcasting, and can be used as independent equipment.
The communication module is arranged on the WIFI/BT chip and is connected with the main controller, so that the obtained height signals of the human body can be transmitted to other modules or other devices (such as mobile terminals corresponding to the user equipment in FIG. 3, such as notebook computers, mobile phones and the like of users) through the communication module.
By combining the embodiments, the device can realize the function of the altimeter by using three chips, namely a millimeter wave chip, an MCU chip and a WIFI/BT chip. Two implementations can be used, the related processing of the millimeter wave chip and the MCU chip is concentrated to one chip of the millimeter wave radar SOC, and the related control and height algorithm processing can be executed in the CPU of the millimeter wave radar SOC.
In combination with the above embodiment, the present application further provides a height measurement method based on millimeter wave radar, where the height measurement method based on millimeter wave radar includes: step S901 to step S904. Step S901, a wake-up module detects whether a human body exists in a preset space range in the environment, if yes, a millimeter wave radar module is activated through a main controller, so that the millimeter wave radar module is in a working state; if not, the master controller does not activate the millimeter wave radar module so that the millimeter wave radar module is always in a dormant state. Step S902, the millimeter wave radar module performs a frequency modulation signal of radar transmission to the head of the human body standing below, and receives an echo signal reflected by the transmission signal. And step 903, the millimeter wave radar module mixes the echo signal with the frequency modulation signal to obtain an intermediate frequency signal. Step S904, the main controller calculates the distance between the head of the human body and the radar according to the intermediate frequency signal, and obtains the height of the human body.
Specifically, in step S901, the wake-up module detects whether a human body exists in the environment within a preset spatial range. The preset space range includes a certain area of the human height measuring device, such as the lower part of the device, but is not limited to the lower part of the device, and is specifically limited according to products and practical conditions.
And detecting whether a human body exists in the environment according to different awakening modes of the awakening module. For example, the wake-up module adopts the sensitivity of the human body to infrared radiation, such as the infrared pair tube module senses the infrared radiation in the environment, and once the human body is detected, such as the human body enters a designated area, the electric signal generated by the infrared pair tube module is transmitted to the main controller. The main controller receives signals of the infrared pair tube module and judges whether the millimeter wave radar needs to be activated or not according to the signal state. The master controller can intelligently decide when to wake up the millimeter wave radar. When the main controller determines that a target or activity (e.g., a human body) exists, the operating state of the millimeter wave radar will be activated. Otherwise, if the wake-up module such as the infrared pair tube module does not detect the human body, the millimeter wave radar module is not activated, so that the millimeter wave radar module is always in a dormant state.
As shown in fig. 7, the power-on initialization of the infrared pair tube module includes setting a human body presence motion detection threshold, etc.
The infrared geminate transistors module detects the existence of human bodies, the infrared geminate transistors are always in a working state after power-on initialization, and when an object approaches the near infrared geminate transistors, the intensity of reflected infrared light can change. This change may cause a current change in the receiving link, and the received current change signal may be amplified and processed by the signal processing unit, and finally output the detection state. And then activating millimeter waves and entering a height measurement process, and activating the millimeter waves to enter a working state when the detection threshold exceeds a set value. Otherwise, the millimeter wave is not activated to enter the working state, namely the millimeter wave is always in the dormant state.
For another example, when the wake-up module is a voice wake-up module, the main controller is triggered to activate the millimeter wave radar module by analyzing the audio data input by the human body based on the voice wake-up technology and judging that the voice wake-up module can contain specific wake-up words, such as "measure height". The voice wake-up module is used for determining wake-up words, for example, when a human body emits sound as the wake-up words, for example, when the human body emits wake-up words such as 'height measurement', the millimeter wave radar module is activated through the main controller, and the millimeter wave radar module is enabled to be converted into a working state from an original dormant state. If the wake-up module does not detect the wake-up word, the millimeter wave radar module is not activated, so that the millimeter wave radar module is always in a dormant state.
For another example, the wake-up module is arranged in the millimeter wave radar module, for example, the millimeter wave radar is in a human motion detection mode based on a low power consumption detection mode of the millimeter wave radar, namely, the millimeter wave radar sweeps according to a frame rate of 4 frames or lower, and is switched to a height measurement mode after detecting human motion, at this time, the millimeter wave radar sweeps according to a frame rate of 16 frames or higher, the sweep bandwidth is wider, and the chirp number contained in each frame is also more, so that the millimeter wave radar module is converted into a working state from a sleep state with low energy consumption. If the millimeter wave radar module is always in the low-power consumption detection mode, namely in the dormant state, low energy consumption is realized.
For another example, the wake-up module may also use other low power radars, such as using other low power microwave radar sensors to detect human motion and wake up the millimeter wave radar into altimetric mode.
In conclusion, the millimeter wave radar is in a working state only when needed, so that the problem of energy consumption caused by the continuous working of the millimeter wave radar is effectively solved, and unnecessary energy consumption is avoided.
As shown in fig. 6 and 8, the height measuring method based on millimeter wave radar of the present application uses the above FMCW ranging principle, that is, a frequency modulation signal which is transmitted to a human body standing below by radar is transmitted to a target area through a transmitting antenna of a radar system, when the transmitting signal encounters a target (such as a human body, particularly a human head), part of energy is reflected by the target, the reflected signal forms an echo signal, a receiving antenna receives the reflected echo signal and mixes with the transmitted frequency modulation signal to obtain an intermediate frequency signal, the frequency of which is equal to the frequency difference of the echo signal, and the frequency difference is related to the distance between the target and the radar. I.e. step S902-step S903 are implemented. By measuring the frequency of the intermediate frequency signal, the distance between the target and the radar can be calculated, the frequency varying in proportion to the distance of the target. And calculating the distance between the human body and the radar by utilizing the frequency difference, so as to realize the measurement of the height of the human body.
The radar initialization comprises the initialization of sweep frequency parameters of a waveform generator, and in order to improve the testing accuracy of the altimeter, the initialization parameters used in the implementation of the invention are configured as follows: the sweep bandwidth is 5GHz, the Chirp (i.e. code pulse modulation) slope is 90.88MHz/us, and the frame rate is 20FPS. Other initializations also include MCU system initializations, WIFI/BT module initializations, etc. Further, radar calibration and data updating are performed, a radar calibration mark is read from the nonvolatile memory, if the altimeter is not calibrated, a radar calibration program is entered, calibration parameters are stored in the nonvolatile memory, and if the altimeter is calibrated, the calibration values are directly read from the nonvolatile memory.
In step S904, height measurement is implemented, radar sweep frequency is started to obtain sweep frequency data, filtering processing is performed on the radar data, a suitable high-low pass filter can be selected according to signal characteristics, and then a height measurement algorithm library is called to obtain the distance from the radar antenna to the head of a person. And finally calculating the height, acquiring a plurality of groups of radar antenna-head top distance data, acquiring data of the sorting intermediate value according to a median method, and calculating with the calibration value to obtain the actual height value of the human body.
When the result is output, the inside: the height data can be displayed through the screen of the altimeter, and can be broadcast through voice. External: the calculated height value of the human body can be transmitted to other modules through a physical communication port according to configuration options, or transmitted to a mobile terminal through a BT/WIFI wireless module for height management and the like.
In conclusion, the application realizes the non-contact measurement of the height of the human body by the millimeter wave radar technology, thereby improving the comfort and convenience of measurement. The novel architecture is formed by combining the wake-up modules, so that the problem of energy consumption caused by the continuous operation of the millimeter wave radar is effectively solved, unnecessary energy consumption is avoided, and energy consumption is saved.
And particularly, the power consumption problem is solved in a mode of activating millimeter wave radar to work through infrared geminate transistors. An infrared pair tube millimeter wave radar scheme is as follows: the infrared geminate transistors have lower power consumption and can be always in a working state, the millimeter wave radar has higher power consumption generally, the millimeter wave radar only enters the working state when necessary, and the power consumption problem is solved by activating the working mode of the millimeter wave radar through the infrared geminate transistors. Likewise, the voice wake-up module and other low-power radars operate with similar logic, and are not described in detail herein.
Radar calibration and data preservation are also implemented: the accuracy of height measurement is improved through radar calibration, and the time of starting the altimeter each time is accelerated through storing calibration data. The 60GHz millimeter wave radar chip is used as a key component and is a core technology for realizing high-precision height measurement. Its use provides high precision measurement capability for the human body.
And the data transmission and management system is realized: and protecting the design and implementation of the data transmission and management module. The height information real-time management system integrates a data transmission module, can conveniently transmit height data to external equipment, such as mobile phone APP, a computer and the like, and realizes real-time management of the height information.
The application can be applied to a plurality of fields such as medical health, business statistics, school education and the like, and has wide practical application value.
The same and similar parts of the embodiments in this specification are all mutually referred to, and each embodiment focuses on the differences from the other embodiments. In particular, for the product embodiments described later, since they correspond to the methods, the description is relatively simple, and reference is made to the description of parts of the system embodiments.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present application should be included in the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.
Claims (10)
1. Height measuring device based on millimeter wave radar, characterized by comprising: the device comprises a millimeter wave radar module, a main controller and a wake-up module;
The wake-up module and the millimeter wave radar module are both connected with the main controller;
the wake-up module is used for activating the millimeter wave radar module through the main controller so as to enable the millimeter wave radar module to be converted into a working state from a dormant state;
the millimeter wave radar module is used for sending a transmitting signal in a working state and receiving an echo signal transmitted by the head of a human body when the transmitting signal touches the head of the human body so as to obtain an intermediate frequency signal according to the transmitting signal and the echo signal;
And the main controller is used for obtaining the height of the human body according to the intermediate frequency signal corresponding to the highest point of the head of the human body through continuous millimeter wave frequency sweeping.
2. The millimeter wave radar-based height measurement device of claim 1, wherein the wake-up module comprises: the infrared geminate transistor module, the voice wake-up module or the preset second radar;
the infrared pair tube module is used for determining that a human body exists in the environment, and the main controller is used for activating the millimeter wave radar module according to a human body existing signal;
The voice wake-up module is used for determining wake-up words so as to activate the millimeter wave radar module through the main controller;
The preset second radar is used for determining that a human body exists in the environment, and the main controller is used for activating the millimeter wave radar module according to the existing human body signals;
or, the wake-up module is arranged in the millimeter wave radar module.
3. The millimeter wave radar-based height measurement device of claim 1, wherein the millimeter wave radar module and the master controller are integrated in a millimeter wave radar chip.
4. The millimeter wave radar-based height measurement device according to claim 1, wherein the millimeter wave radar module is provided in a millimeter wave chip or the main controller is provided in an MCU chip.
5. The millimeter wave radar-based height measurement device of claim 1, wherein the wake-up module is integrated with a millimeter wave radar chip;
or the wake-up module is arranged on the MCU chip and is connected with the main controller.
6. The millimeter wave radar-based height measurement device according to claim 1, further comprising:
And the communication module is connected with the main controller so that the obtained signals of the height of the human body are transmitted to other modules or other devices through the communication module.
7. The millimeter wave radar-based height measurement device according to claim 6, wherein the communication module is provided to a WIFI/BT chip.
8. The millimeter wave radar-based height measurement device according to claim 1, further comprising:
The display module is connected with the main controller so that the display module can display the height of the human body obtained by the main controller;
And/or the number of the groups of groups,
The voice broadcasting module is connected with the main controller, so that the voice broadcasting module broadcasts the height of the human body obtained by the main controller.
9. The millimeter wave radar-based height measurement device according to claim 1, further comprising:
and the storage module is connected with the main controller so as to store the height data of the human body.
10. The height measurement method based on the millimeter wave radar is characterized by comprising the following steps of:
The wake-up module detects whether a human body exists in a preset space range or not in the environment, and if so, the millimeter wave radar module is activated through the main controller so as to be in a working state; if not, the master controller does not activate the millimeter wave radar module so that the millimeter wave radar module is always in a dormant state;
The millimeter wave radar module carries out frequency modulation signals emitted by radar to the head of a human body standing below and receives echo signals reflected by the emitted signals;
the millimeter wave radar module mixes the echo signal with the frequency modulation signal to obtain an intermediate frequency signal;
And the main controller obtains the height of the human body by calculating the distance between the head of the human body and the radar according to the intermediate frequency signal.
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| CN202410513039.7A CN118216903A (en) | 2024-04-26 | 2024-04-26 | Height measuring device and height measuring method based on millimeter wave radar |
| US18/934,266 US12379462B1 (en) | 2024-04-26 | 2024-11-01 | Height measurement device and height measurement method based on millimeter-wave radar |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119689465A (en) * | 2025-02-24 | 2025-03-25 | 隔空（上海）智能科技有限公司 | Motion detection and counting system based on millimeter wave radar technology |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN119689465A (en) * | 2025-02-24 | 2025-03-25 | 隔空（上海）智能科技有限公司 | Motion detection and counting system based on millimeter wave radar technology |
| CN119689465B (en) * | 2025-02-24 | 2025-07-08 | 隔空（上海）智能科技有限公司 | Motion detection and counting system based on millimeter wave radar technology |
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