Animal vital sign monitoring method and system based on microwave beam regulation

Abstract

The application provides an animal vital sign monitoring method and system based on microwave beam regulation, comprising: a positioning step: detecting and positioning the target breathing and heartbeat sensitive parts in the field of view based on a band-pass filter set; a phase shift control step: constructing a phase encoding matrix, and performing phase shift control on the transmission signal of the transmission antenna, so that the synthetic beams of multiple transmission antennas are directed to the sensitive parts positioned; a signal transceiving step: acquiring multiple echo signals and performing signal processing to obtain multi-channel baseband signals; a demodulation step: performing fine phase demodulation on the multi-channel baseband signals to extract the vital sign information of the target. The application can process the multi-channel baseband signals through the band-pass filter set, realize the detection and positioning of the animal breathing and heartbeat sensitive parts, and detect the animal vital signs through the phase encoding and beam focusing method, so as to improve the test distance, signal-to-noise ratio and measurement accuracy.

Description

Technical Field

[0001] This invention relates to vital sign monitoring technology, specifically to a method and system for monitoring animal vital signs based on microwave beam modulation. Background Technology

[0002] In daily production, life, scientific research, and work, it is often necessary to monitor the vital signs of animals. For example, in the raising of livestock such as cattle and sheep, timely monitoring of abnormal conditions in the livestock's body is necessary to reduce mortality; in the observation, research, and protection of wild animals, the vital signs of wild animals are monitored, statistically analyzed, and recorded; and in laboratory animal experiments, vital signs are monitored to complete scientific research.

[0003] Most existing methods for monitoring vital signs involve contact measurement, such as attaching contact sensors to the animal's body and transmitting data wirelessly. The installation process for these sensors is inherently dangerous, especially in monitoring wild animals. Furthermore, these contact sensors can affect the animal's comfort, thus influencing the measurement results.

[0004] Therefore, achieving long-distance, non-contact, portable, and accurate vital sign monitoring is of significant research importance. In recent years, microwave sensing methods have been used for human vital sign monitoring. However, current microwave-based vital sign monitoring requires the human body to remain in a near-static state, and the microwave radar must be aimed at the chest cavity, making it difficult to accurately locate sensitive areas for respiratory and heartbeat monitoring at long distances. In summary, existing microwave sensing methods still have significant limitations in long-distance, non-contact vital sign monitoring in animals. Summary of the Invention

[0005] In view of the deficiencies in the existing technology, the purpose of this invention is to provide a method and system for monitoring animal vital signs based on microwave beam modulation.

[0006] A method for monitoring animal vital signs based on microwave beam modulation, provided by the present invention, includes:

[0007] Localization steps: Detect and locate the target's breathing and heartbeat sensitive parts within the field of view based on a bandpass filter bank;

[0008] Phase shift control steps: Construct a phase encoding matrix and perform phase shift control on the transmitted signal of the transmitting antenna so that the combined beam of multiple transmitting antennas is directed toward the sensitive part obtained from the positioning.

[0009] Signal transmission and reception steps: Acquire multiple echo signals and perform signal processing to obtain multi-channel baseband signals;

[0010] Demodulation steps: Perform micro-phase demodulation on the multi-channel baseband signal to extract the target's vital signs information.

[0011] Preferably, the positioning step includes:

[0012] Step 1.1: Transmit and receive microwave signals to obtain multi-channel microwave baseband signals BS. i =[S1,S2,…,S N ], where i represents the i-th frequency sweep cycle, N is the number of equivalent receiving channels output by the millimeter-wave front end, and S is the baseband signal of the n-th receiving channel. n =[s(1,n),s(2,n),…s(M,n)], where M is the total number of sampling points for a single channel in one sweep cycle;

[0013] Step 1.2: Obtain the thermal map information of the microwave baseband signal for each frequency sweep cycle to obtain the position information of each target within the field of view;

[0014] Step 1.3: Bandpass filter bank is used to perform bandpass filtering on the heatmap information within multiple frequency sweep cycles, wherein the first passband of the bandpass filter bank is... The second passband is The angular information θ of sensitive parts of the animal's breathing and heartbeat is obtained from the filtered heatmap. q (q = 1, 2).

[0015] Preferably, the phase shift control step includes:

[0016] Step 2.1: Based on the angle information θ q Construct the phase encoding matrix:

[0017]

[0018] Where d k (k = 2, ..., K) represents the distance between the k-th transmitting antenna and the first transmitting antenna, K is the number of transmitting antennas, and λ c The wavelength corresponding to the center frequency of a linear frequency modulated continuous wave;

[0019] Based on the phase coding matrix, the initial phases of each transmitting antenna are set as follows: 0, 2πd²sinθ q / λ c , …, 2πd K sinθ q / λ c ;

[0020] Step 2.2: Control each antenna to transmit microwave signals simultaneously, so that the main lobe direction angle of the synthesized beam is θ. q Oriented toward the animal to be tested.

[0021] Preferably, the signal transmission and reception steps include:

[0022] Multiple transmitting antennas are controlled to simultaneously transmit linear frequency modulated continuous wave signals, so that the main lobe of the synthesized beam is directed toward the sensitive part of the target. Multiple receiving antennas are used to receive the echo signal from the target, and after hardware mixing and low-pass filtering, a multi-channel microwave baseband signal is obtained.

[0023] Preferably, the demodulation step includes:

[0024] Step 4.1: Extract the time series of micro-motion displacements caused by respiration and heartbeat in sensitive areas during each scanning cycle through micro-motion phase demodulation.

[0025]

[0026] In the formula, x(θ) q ,R,iT sweep The angle θ represents the beam scanning angle. q The displacement sequence element values ​​of the respiratory and cardiac sensitive parts of the tested animal with a transmission sweep period of i and a distance of R; T sweep The frequency sweep period for transmitting a linear frequency modulated continuous wave via the transmitting antenna; arg[·] is the operation for taking complex phase values; N is the number of single-channel baseband signal elements in each frequency sweep period; n is the index of the single-channel baseband signal element in each frequency sweep period; T s The sampling frequency and time of the baseband signal; s B (θ q iT,nT s ) represents the beam scanning angle as θ q The matrix consists of M baseband signals from the i-th transmit frequency sweep cycle, with column vectors representing the baseband signals from the m-th channels (m = 1, 2, ..., M); j is the imaginary unit. The estimated beat frequency corresponding to the distance between the measured target or measuring point; d rxm Let d be the distance from the m-th receiving antenna to the first receiving antenna, where m = 1, ..., M, and d is the distance from the m-th receiving antenna to the first receiving antenna. rx1 =0; λ c The wavelength corresponding to the center frequency of a linear frequency modulated continuous wave;

[0027] Step 4.2: Process the micro-displacement time series, including Fast Fourier Transform, to obtain vital sign information, including respiratory and heart rate.

[0028] Preferably, it further includes:

[0029] Beam scanning step: After the demodulation step, return to the phase shift control step, direct the synthesized beam toward the sensitive part of the next target obtained from the localization and continue monitoring.

[0030] An animal vital signs monitoring system based on microwave beam modulation, provided by the present invention, includes:

[0031] A microwave transceiver that transmits multi-channel linear frequency modulated continuous wave microwave signals, receives echo signals, and outputs multi-channel baseband signals;

[0032] Target detection and localization module: Processes multi-channel baseband signals to obtain heat map information, and detects and localizes target breathing and heartbeat sensitive parts within the field of view based on bandpass filter banks;

[0033] The beam scanning control processing module constructs a phase encoding matrix, performs phase shift control on the transmitted signal of the transmitting antenna, so that the combined beam of multiple transmitting antennas is directed toward the sensitive part obtained by positioning, performs micro-phase demodulation on the multi-channel baseband signal, and extracts the target's vital signs information.

[0034] Preferably, the target detection and positioning module transmits and receives microwave signals to obtain multi-channel microwave baseband signals BS. i =[S1,S2,…,S N ], where i represents the i-th frequency sweep cycle, N is the number of equivalent receiving channels output by the millimeter-wave front end, and S is the baseband signal of the n-th receiving channel. n =[s(1,n),s(2,n),…s(M,n)], where M is the total number of sampling points for a single channel in one sweep cycle; acquire the thermal image information of the microwave baseband signal for each sweep cycle to obtain the position information of each target within the field of view; use a bandpass filter bank to perform bandpass filtering on the thermal image information in multiple sweep cycles, where the first passband of the bandpass filter bank is... The second passband is The angular information θ of sensitive parts of the animal's breathing and heartbeat is obtained from the filtered heatmap. q (q = 1, 2).

[0035] Preferably, the beam scanning control processing module: based on the angle information θ q Construct the phase encoding matrix:

[0036]

[0037] Where d k (k×2,…K) represents the distance between the k-th transmitting antenna and the first transmitting antenna, where K is the number of transmitting antennas, and λ c The wavelength corresponding to the center frequency of a linear frequency modulated continuous wave;

[0038] Based on the phase coding matrix, the initial phases of each transmitting antenna are set as follows: 0, 2πd²sinθ q / λc , …, 2πd K sinθ q / λ c ;

[0039] Controlling all antennas to simultaneously transmit microwave signals, so that the main lobe direction angle of the synthesized beam is θ q Oriented toward the animal to be tested.

[0040] Preferably, the beam scanning control processing module extracts the time series of micro-displacement caused by respiration and heartbeat in sensitive areas during each scanning cycle through micro-motion phase demodulation:

[0041]

[0042] In the formula, x(θ) q ,R,iT sweep The angle θ represents the beam scanning angle. q The displacement sequence element values ​​of the respiratory and cardiac sensitive parts of the tested animal with a transmission sweep period of i and a distance of R; T sweep The frequency sweep period for transmitting a linear frequency modulated continuous wave via the transmitting antenna; arg[·] is the operation for taking complex phase values; N is the number of single-channel baseband signal elements in each frequency sweep period; n is the index of the single-channel baseband signal element in each frequency sweep period; T s The sampling frequency and time of the baseband signal; s B (θ q iT,nT s ) represents the beam scanning angle as θ q The matrix consists of M baseband signals from the i-th transmit frequency sweep cycle, with column vectors representing the baseband signals from the m-th channels (m = 1, 2, ..., M); j is the imaginary unit. The estimated beat frequency corresponding to the distance between the measured target or measuring point; d rxm Let d be the distance from the m-th receiving antenna to the first receiving antenna, where m = 1, ..., M, and d is the distance from the m-th receiving antenna to the first receiving antenna. rx1 =0; λ c The wavelength corresponding to the center frequency of a linear frequency modulated continuous wave;

[0043] The time series of micro-motion displacements is processed, including by fast Fourier transform, to obtain vital signs information, including respiratory and heart rate.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] This invention can process multi-channel baseband signals through a bandpass filter bank to achieve automatic detection and localization of sensitive parts of animal breathing and heartbeat; and can detect animal vital signs through phase encoding and beam focusing, which greatly improves the test distance, signal-to-noise ratio and measurement accuracy. Attached Figure Description

[0046] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0047] Figure 1 This is a flowchart of an animal vital sign monitoring method based on microwave beam modulation according to the present invention.

[0048] Figure 2 This is a schematic diagram of an animal vital signs monitoring system based on microwave beam modulation according to the present invention. Detailed Implementation

[0049] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0050] like Figure 1 The diagram shown is a flowchart of an animal vital sign monitoring method based on microwave beam modulation proposed in this invention, which specifically includes the following steps:

[0051] Step 1: Detection and localization of animal respiratory and heartbeat sensitive areas within the field of view based on bandpass filter banks. In actual monitoring environments, in addition to the animal target, there are other environmental targets that interfere, such as trees and buildings. Furthermore, during long-distance monitoring, other parts of the animal target's body, such as the head and legs, can interfere with the detection of animal respiratory and heartbeat sensitive areas (abdomen and heart). Therefore, in order to achieve high-precision localization of animal respiratory and heartbeat sensitive areas, this invention utilizes the animal target's vital sign information to construct two bandpass filters to filter out targets with animal respiratory and heartbeat frequencies and eliminate other interfering targets.

[0052] Step 1.1: Transmit and receive microwave signals to obtain multi-channel microwave baseband signals BS. i =[S1,S2,…,S N ], where i represents the i-th frequency sweep cycle, N is the number of equivalent receiving channels output by the millimeter-wave front end, and S is the baseband signal of the n-th receiving channel. n = [s(1,n),s(2,n),…s(M,n)], where M is the total number of sampling points for a single channel in one sweep cycle.

[0053] Step 1.2: Obtain the thermal map information of the microwave baseband signal for each frequency sweep cycle to obtain the position information of each target within the field of view.

[0054] Step 1.3 further involves filtering out interference from other targets in the environment by using a bandpass filter bank to perform bandpass filtering on the multi-channel heatmap information. Specifically, the passband of the first bandpass filter is set according to the animal's respiratory frequency range. The passband of the second bandpass filter is set according to the animal's heart rate range. The angular information θ of sensitive parts of the animal's breathing and heartbeat is obtained from the filtered heatmap. q (q=1,2), which is the location information of the animal's abdomen and heart.

[0055] Step 2: Construct a phase coding matrix to control the phase shift of the transmitted signals from multiple transmitting antennas, ensuring the synthesized beam is directed towards the sensitive areas of the animal's breathing and heartbeat. In actual testing, to reduce interference from other surrounding animal targets, phase coding is used to achieve beam focusing for directional testing.

[0056] Step 2.1, based on the angle information θ of the animal target. q Construct the phase encoding matrix:

[0057]

[0058] Where d k (k = 2, ..., K) represents the distance between the k-th transmitting antenna and the first transmitting antenna, K is the number of transmitting antennas, and λ c The wavelength corresponding to the center frequency of a linear frequency modulated continuous wave;

[0059] Based on the phase coding matrix, the initial phases of each transmitting antenna are set as follows: 0, 2πd²sinθ q / λ c , …, 2πd K sinθ q / λ c .

[0060] Step 2.2: Control each antenna to transmit microwave signals simultaneously, so that the main lobe direction angle of the synthesized beam is θ. q Oriented toward the animal to be tested.

[0061] Let the transmitted signal from the first transmitting antenna be s1(t), and the synthesized transmitted signal through phase shift control be:

[0062]

[0063] in,

[0064] Among them, A TLet f be the amplitude of the transmitted signal, f0 be the initial frequency of the transmitted signal, B be the signal bandwidth, T be the time length of one sweep cycle of the transmitted signal, φ0 be the initial phase, t be the time sequence, θ be the traversal angle value, and a(θ) be the amplitude of the transmitted signal. H It is the conjugate transpose of a(θ).

[0065] Step 3: Acquire the multi-channel baseband signal under beam focusing.

[0066] Multiple transmitting antennas are controlled to simultaneously transmit linear frequency modulated continuous wave signals, so that the main lobe of the synthesized beam is directed towards the sensitive parts of the animal's breathing and heartbeat. Multiple receiving antennas are used to receive the echo signals from the sound source target. After hardware mixing and low-pass filtering, the baseband signal corresponding to the channel of the first receiving antenna is obtained as follows:

[0067]

[0068] In the formula, ψ=πd(sinθ0-sinθ) / λ c

[0069] set up After demodulation by the beat frequency, the complex phase vector is obtained as follows: The complex phase vector of the receiving array antenna channel can be expressed as:

[0070]

[0071] Among them, A B The amplitude of the received signal is T, where λ0 is the wavelength corresponding to the initial frequency. sweep The sweep frequency is the duration, and R is the distance between the target animal and the antenna.

[0072] Step 4: Extract vital signs information of the animal target through micro-motion phase demodulation.

[0073] Step 4.1: Through micro-motion phase demodulation, extract the time series of micro-motion displacements of the test animal due to respiration and heartbeat for each scanning cycle:

[0074]

[0075] In the formula, x(θ) q ,R,iT sweep The angle θ represents the beam scanning angle. q The displacement sequence element values ​​of the respiratory and cardiac sensitive parts of the tested animal with a transmission sweep period of i and a distance of R; T sweep The frequency sweep period for transmitting a linear frequency modulated continuous wave via the transmitting antenna; arg[·] is the operation for taking complex phase values; N is the number of single-channel baseband signal elements in each frequency sweep period; n is the index of the single-channel baseband signal element in each frequency sweep period; T sThe sampling frequency and time of the baseband signal; s B (θ q iT,nT s ) represents the beam scanning angle as θ q The matrix consists of M baseband signals from the i-th transmit frequency sweep cycle, with column vectors representing the baseband signals from the m-th channels (m = 1, 2, ..., M); j is the imaginary unit. The estimated beat frequency corresponding to the distance between the measured target or measuring point; d rxm Let d be the distance from the m-th receiving antenna to the first receiving antenna, where m = 1, ..., M, and d is the distance from the m-th receiving antenna to the first receiving antenna. rx1 =0.

[0076] Step 4.2: Process the above micro-displacement time series, including Fast Fourier Transform, to obtain vital sign information, including respiratory rate and heart rate.

[0077] Step 5: Vital signs of all animal targets within the field of view are monitored by beam scanning.

[0078] If there are multiple animal targets in the scene, repeat steps 2-4, change the phase encoding matrix, and use beam scanning control to move towards the next animal target to be tested, acquire the baseband signal and extract its vital signs information, until the scanning and vital signs extraction of all animal targets within the field of view are completed.

[0079] like Figure 2 As shown, this invention also proposes an animal vital signs monitoring system based on microwave beam modulation. This system can be implemented by executing the steps of the microwave beam modulation-based animal vital signs monitoring method. That is, those skilled in the art can understand the microwave beam modulation-based animal vital signs monitoring method as a preferred embodiment of the system. The system includes:

[0080] A microwave transceiver is used to simultaneously transmit multiple channels of linear frequency modulated continuous wave microwave signals, receive echo signals, and output multiple channels of baseband signals. It achieves cyclic scanning of the synthesized beam through phase shift control of the transmitting antenna.

[0081] Animal target detection and localization module: used to process multi-channel baseband signals to obtain heat map information, and to detect and localize sensitive parts of the animal's breathing and heartbeat through a bandpass filter bank.

[0082] The beam scanning control and processing module is used to control the beam scanning of the microwave signal transceiver, the acquisition of baseband signals, and the extraction of the respiratory and cardiac micro-movement displacements of the target animal.

[0083] The beam scanning control and processing module includes a scanning control unit and a signal acquisition and processing unit. The scanning control unit is used for phase shift control of the transmitting antenna channel, scanning speed control, and control of other conventional parameters of the microwave transceiver. The signal acquisition and processing unit is used for synchronous acquisition of multi-channel baseband signals, and for processing the acquired signals to extract the micro-displacement values ​​of the animal's respiration and heartbeat.

[0084] Display and save module: used to display or save the heat map of each target within the field of view, the animal's location information, the time series of the animal's breathing and heartbeat micro-movements, and other intermediate processing information.

[0085] Those skilled in the art will understand that, besides implementing the system and its various devices, modules, and units provided by this invention in the form of purely computer-readable program code, the same functions can be achieved entirely through logical programming of the method steps, making the system and its various devices, modules, and units of this invention function in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers. Therefore, the system and its various devices, modules, and units provided by this invention can be considered as a hardware component, and the devices, modules, and units included therein for implementing various functions can also be considered as structures within the hardware component; alternatively, the devices, modules, and units for implementing various functions can be considered as both software modules implementing the method and structures within the hardware component.

[0086] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A method for monitoring animal vital signs based on microwave beam modulation, characterized in that, include: Localization steps: Detect and locate the target's breathing and heartbeat sensitive parts within the field of view based on a bandpass filter bank; Phase shift control steps: Construct a phase encoding matrix and perform phase shift control on the transmitted signal of the transmitting antenna so that the combined beam of multiple transmitting antennas is directed toward the sensitive part obtained from the positioning. Signal transmission and reception steps: Acquire multiple echo signals and perform signal processing to obtain multi-channel baseband signals; Demodulation steps: Perform micro-phase demodulation on the multi-channel baseband signal to extract the target's vital signs information; The positioning steps include: Step 1.1: Transmit and receive microwave signals to obtain multi-channel microwave baseband signals. Where i represents the i-th frequency sweep cycle, N is the number of equivalent receiving channels output by the millimeter-wave front-end, and the baseband signal of the n-th receiving channel is... M represents the total number of sampling points for a single channel within one sweep cycle; Step 1.2: Obtain the thermal map information of the microwave baseband signal for each frequency sweep cycle to obtain the position information of each target within the field of view; Step 1.3: Bandpass filter bank is used to perform bandpass filtering on the heatmap information within multiple frequency sweep cycles, wherein the first passband of the bandpass filter bank is... The second passband is The angle information of sensitive parts of the animal's breathing and heartbeat is obtained from the filtered heatmap. ; The demodulation steps include: Step 4.1: Extract the time series of micro-motion displacements caused by respiration and heartbeat in sensitive areas during each scanning cycle through micro-motion phase demodulation. In the formula, The angle represented by the beam scanning is The transmission frequency sweep period is , the displacement sequence element values ​​of the respiratory and cardiac sensitive parts of the tested animal at a distance of R; The frequency sweep period for transmitting linear frequency modulated continuous waves via the transmitting antenna; For operations involving complex phase values; N is the number of single-channel baseband signal elements in each sweep cycle; n is the index of a single-channel baseband signal element in each sweep cycle; The sampling frequency and time of the baseband signal; The beam scanning angle is , No. A matrix consisting of M channels of baseband signals across 1 transmit sweep cycle, with column vectors of the matrix being the ______. The baseband signal of the channel; The imaginary unit; This is the estimated beat frequency corresponding to the distance between the measured target or the measuring point; Let be the distances from the m-th receiving antenna to the first receiving antenna, where m = 1, ..., M. ; The wavelength corresponding to the center frequency of a linear frequency modulated continuous wave; Step 4.2: Process the micro-displacement time series, including Fast Fourier Transform, to obtain vital sign information, including respiratory and heart rate.

2. The method for monitoring animal vital signs based on microwave beam modulation according to claim 1, characterized in that, The phase shift control steps include: Step 2.1: Based on the angle information Construct the phase encoding matrix: Where d k Let k = 2, ..., K, where k is the distance from the k-th transmitting antenna to the first transmitting antenna, and K is the number of transmitting antennas. The wavelength corresponding to the center frequency of a linear frequency modulated continuous wave; Based on the phase coding matrix, the initial phase of each transmit antenna is set as follows: 0, , ..., ; Step 2.2: Control each antenna to simultaneously transmit microwave signals, so that the main lobe direction angle of the synthesized beam is... Orient it toward the sensitive areas of the animal being tested, such as its breathing and heartbeat.

3. The method for monitoring animal vital signs based on microwave beam modulation according to claim 2, characterized in that, The signal transmission and reception steps include: Multiple transmitting antennas are controlled to simultaneously transmit linear frequency modulated continuous wave signals, so that the main lobe of the synthesized beam is directed toward the sensitive part of the target. Multiple receiving antennas are used to receive the echo signal from the target, and after hardware mixing and low-pass filtering, a multi-channel microwave baseband signal is obtained.

4. The method for monitoring animal vital signs based on microwave beam modulation according to claim 1, characterized in that, Also includes: Beam scanning step: After the demodulation step, return to the phase shift control step, direct the synthesized beam toward the sensitive part of the next target obtained from the localization and continue monitoring.

5. An animal vital signs monitoring system based on microwave beam modulation, characterized in that, include: A microwave transceiver that transmits multi-channel linear frequency modulated continuous wave microwave signals, receives echo signals, and outputs multi-channel baseband signals; Target detection and localization module: Processes multi-channel baseband signals to obtain heat map information, and detects and localizes target breathing and heartbeat sensitive parts within the field of view based on bandpass filter banks; The beam scanning control processing module constructs a phase encoding matrix, performs phase shift control on the transmitted signal of the transmitting antenna, so that the combined beam of multiple transmitting antennas is directed toward the sensitive part obtained by positioning, performs micro-phase demodulation on the multi-channel baseband signal, and extracts the target's vital signs information. The target detection and positioning module transmits and receives microwave signals to obtain multi-channel microwave baseband signals. Where i represents the i-th frequency sweep cycle, N is the number of equivalent receiving channels output by the millimeter-wave front-end, and the baseband signal of the n-th receiving channel is... M represents the total number of sampling points for a single channel within one sweep cycle; thermal image information of the microwave baseband signal is acquired for each sweep cycle to obtain the position information of each target within the field of view; bandpass filter banks are used to perform bandpass filtering on the thermal image information within multiple sweep cycles, wherein the first passband of the bandpass filter bank is... The second passband is The angle information of sensitive parts of the animal's breathing and heartbeat is obtained from the filtered heatmap. ; The beam scanning control processing module extracts the time series of micro-displacement caused by respiration and heartbeat in sensitive areas during each scanning cycle through micro-motion phase demodulation. In the formula, The angle represented by the beam scanning is The transmission frequency sweep period is , the displacement sequence element values ​​of the respiratory and cardiac sensitive parts of the tested animal at a distance of R; The frequency sweep period for transmitting linear frequency modulated continuous waves via the transmitting antenna; For operations involving complex phase values; N is the number of single-channel baseband signal elements in each sweep cycle; n is the index of a single-channel baseband signal element in each sweep cycle; The sampling frequency and time of the baseband signal; The beam scanning angle is , No. A matrix consisting of M channels of baseband signals across 1 transmit sweep cycle, with column vectors of the matrix being the ______. The baseband signal of the channel; The imaginary unit; This is the estimated beat frequency corresponding to the distance between the measured target or the measuring point; Let be the distances from the m-th receiving antenna to the first receiving antenna, where m = 1, ..., M. ; The wavelength corresponding to the center frequency of a linear frequency modulated continuous wave; The time series of micro-motion displacements is processed, including by fast Fourier transform, to obtain vital signs information, including respiratory and heart rate.

6. The animal vital signs monitoring system based on microwave beam modulation according to claim 5, characterized in that, The beam scanning control processing module: based on the angle information Construct the phase encoding matrix: Where d k Let k = 2, ..., K, where k is the distance from the k-th transmitting antenna to the first transmitting antenna, and K is the number of transmitting antennas. The wavelength corresponding to the center frequency of a linear frequency modulated continuous wave; Based on the phase coding matrix, the initial phase of each transmit antenna is set as follows: 0, , ..., ; Controlling each antenna to simultaneously transmit microwave signals, so that the main lobe direction angle of the synthesized beam is . Oriented toward the animal to be tested.

Images