62 results about "Heart frequency" patented technology

The invention belongs to the technical field of remote health monitoring, medical diagnosis and intelligent health equipment, and discloses a non-contact heartbeat monitoring method and system based on millimeter wave signals. According to the non-contact heartbeat monitoring system, heartbeat monitoring is achieved by transmitting and receiving millimeter wave signals reflected from the chest of the human body through the millimeter wave radar technology. Tiny movement generated by cardiac pulsation can cause tiny changes of the chest of the human body, and the changes are shown through reflected millimeter wave signals. By processing and analyzing the reflected signals in real time, the influence of heartbeat on the signals can be accurately extracted, so that the heartbeat frequency and physiological indexes related to the electrocardiogram can be deduced.

The present invention discloses a dynamic early warning system for cardiac arrest based on multimodal data fusion, belonging to the field of medical information technology. Specifically, it includes: a non-contact sensing module for continuously acquiring the physiological parameters of a user based on non-contact devices; an active wearing module for starting the acquisition of contact physiological parameters when the user actively triggers the wearing device; a scene adaptive module for constructing a physiological parameter baseline only based on non-contact sensing data when the wearing device is not triggered; when the user triggers the wearing device, cross-verifying the contact data and the non-contact data and correcting the calibration parameters of the non-contact data; a risk decision module for starting a forced verification process of contact data when the non-contact detection detects an abnormal heart rate; if the verification fails or there is no response, generating a corresponding risk level early warning based on the continuous abnormal duration and the fluctuation pattern; the present invention realizes dynamic early warning based on multimodal data.

The present application discloses a vital sign evaluation system based on data analysis, which relates to the field of vital sign monitoring technology. The specific scheme includes: mixing the echo signals from the target area to obtain two intermediate frequency signals, and then amplifying them to obtain the first signal and the second signal; then performing respiratory filtering and heartbeat filtering to obtain the third signal and the fourth signal, and then determining the respiratory frequency and the heartbeat frequency, and then updating the respiratory filter parameters and the heartbeat filter parameters; obtaining the respiratory frequency and the heartbeat frequency at the current moment, as well as multiple historical respiratory frequencies and multiple historical heartbeat frequencies, determining the heart rate variability and respiratory depth changes corresponding to the current moment, and then determining the vital sign evaluation results based on the vital sign evaluation score formula. The present disclosure can solve the problem in the prior art that the filtering processing cannot follow the frequency changes of the vital sign signal in real time, resulting in inaccurate vital sign data, and improve the accuracy of the vital sign evaluation results.

The invention belongs to the field of non-contact vital sign detection, and particularly relates to a millimeter wave radar arrhythmia detection method based on particle swarm optimization variational mode decomposition and deep learning, and the method specifically comprises the steps: S1, obtaining a human chest micro-motion signal through a millimeter wave radar, performing static clutter filtering, phase extraction, unwrapping and detrending processing on the radar echo signal to obtain a chest displacement signal containing heartbeat and breathing information; s2, aiming at the thoracic cavity displacement signal, constructing a variational mode decomposition model, and carrying out adaptive optimization on a mode number and a penalty factor through a particle swarm optimization algorithm to obtain an optimal decomposition parameter and complete signal decomposition; s3, according to the center frequency and the energy distribution characteristics of each modal component, screening the modal components in the heartbeat frequency range and reconstructing the modal components to obtain heartbeat characteristic signals representing heart mechanical activities; s4, carrying out time sequence segmentation on the heartbeat characteristic signals, extracting local heart beat morphological characteristics by utilizing a convolutional neural network, and carrying out modeling on a long-time rhythm dependency relationship of the heartbeat signals in combination with a time sequence modeling network based on an attention mechanism to obtain heart rhythm depth characteristic representation; and S5, inputting the heart rhythm depth features into a heart rhythm discrimination model, analyzing the heart rhythm state of the detected person, and outputting an arrhythmia detection result. According to the method, adaptive selection of variational mode decomposition parameters is realized by introducing a particle swarm optimization mechanism, heartbeat signals and respiration and motion interference components are effectively separated, modeling is carried out on rhythm characteristics in combination with a deep learning model, and non-contact detection of arrhythmia is realized. The method does not need to wear an electrode or contact a human body, has the advantages of strong anti-interference capability, good adaptability and high detection precision, and has a good application prospect in the fields of heart rhythm health monitoring, disease screening and the like.

The invention discloses a sudden cardiac arrest dynamic early warning system based on multi-modal data fusion, and belongs to the technical field of medical information, and the system specifically comprises a non-contact sensing module which is used for continuously obtaining physiological parameters of a user based on a non-contact device; the active wearing module is used for starting contact type physiological parameter acquisition when a user actively triggers the wearable equipment; the scene self-adaption module is used for constructing a physiological parameter base line only based on the non-contact sensing data when the wearable equipment is not triggered; when the user triggers the wearable device, performing cross validation on the contact data and the non-contact data, and correcting calibration parameters of the non-contact data; the risk decision module is used for starting a contact type data forced verification process when the heartbeat frequency is detected to be abnormal in a non-contact manner; if verification fails or no response is made, corresponding risk level early warning is generated based on the continuous abnormal duration and the fluctuation mode; according to the invention, dynamic early warning is realized based on multi-modal data.

This invention discloses a method for monitoring human vital signs in motion scenarios. It receives radar reflection signals reflected from the human body, mixes these signals with the transmitted radar signal to obtain a raw intermediate frequency (IF) signal, performs a Fourier transform on the IF signal to construct feature spectrum data, and uses a sliding window sampling method to extract the feature spectrum according to a preset window length and step size. This extracted spectrum is then input into a trained classifier network model to identify motion or non-motion states, and the type of motion within the motion state. During non-motion states within the motion period, it monitors respiratory or heart rate. This invention utilizes millimeter-wave radar to monitor human vital signs, offering advantages such as low light dependence, good privacy protection, high monitoring sensitivity, and non-contact operation.

The application discloses a kind of based on neural network's acoustic user identification and heartbeat monitoring earphone system and method, the system includes the earphone with microphone, acoustic analog-digital conversion equipment, the back-end service equipment at least includes: data acquisition module is used for acoustic signal transmission and reception;Data processing module is used to obtain preprocessed received signal;Human ear canal feature extraction module is used to extract MFCC feature and ear canal feature based on transfer function;User identity identification module is used to obtain trained neural network model;Heartbeat information extraction module is used to obtain processed phase information;Self-interference elimination module obtains phase signal not containing direct path interference;Heartbeat frequency calculation module is used to obtain heartbeat frequency.The application can reduce the cost of identity recognition and heartbeat monitoring, and robustness, high robustness.

The invention discloses a signal processing method and system, and the method comprises the steps: continuously transmitting a pulse signal which is used for detecting the breath of a target user and the heartbeat of the target user; receiving an echo signal of the pulse signal; based on the echo signal processing, obtaining a first respiratory frequency for representing the respiration of the target user, a first heartbeat frequency for representing the heartbeat of the target user, and a confidence coefficient for representing the first respiratory frequency and the first heartbeat frequency for representing the credibility of the respiration and the heartbeat of the target user; and at least outputting a second respiratory rate and a second heartbeat rate based on the first respiratory rate, the first heartbeat rate and the confidence.

The application discloses a kind of multi-person vital sign monitoring method and system based on space-time coding hypersurface, utilize the harmonic wave beam scanning area of attention generated by space-time coding hypersurface to carry out human detection, and allocate the beam of frequency orthogonal for each detected human target, to accurately estimate their respiratory and heartbeat rate.The system can monitor the vital sign of multiple people simultaneously, and accurately estimate the respiratory and heartbeat frequency of human target.The control ability of space-time coding hypersurface used in the application can reduce the noise reflected by non-related objects, thereby improving the signal-to-noise ratio of human chest echo.The application uses wireless signals, has unique advantages such as not easily disturbed by environmental factors and protecting visual privacy.Compared with traditional vital sign monitoring instruments, the non-contact characteristics of the application can reduce the stress and interference on the user, and can be used for long-term, remote health monitoring.

To provide a motion discrimination device capable of detecting a state that a user raises his or her upper body on a bed.SOLUTION: A motion discrimination device 10 for discriminating a motion of a user U on a bed 20 includes: a sensor 30 arranged at a position corresponding to the body of the user U; and a processing device 40 for receiving and processing an output signal output by the sensor 30. The sensor 30 detects a change in a load that the user U applies to the sensor 30. The processing device 40 includes an arithmetic device 41 and a discrimination device 42. The arithmetic device 41 generates a respiration frequency signal including a frequency component corresponding to the respiration of the user U on the basis of the output signal, and generates a heartbeat frequency signal including a frequency component corresponding to the heartbeat of the user U on the basis of the output signal. The discrimination device 42 discriminates a raised state in which the user U raises his or her upper body on the bed 20 on the basis of at least one of the respiration frequency signal and the heartbeat frequency signal.SELECTED DRAWING: Figure 1

The invention discloses an embryo screening method and device based on a millimeter-wave radar, and the method comprises the steps: transmitting a frequency-modulated continuous wave by the millimeter-wave radar to irradiate an embryo egg, receiving an echo signal, and mixing the echo signal with a transmitted signal to obtain an intermediate-frequency signal; the intermediate frequency signal is sent to a computer signal processing terminal through a signal acquisition device; preprocessing the radar signal, including performing circle fitting by using a correlation optimized least square method, eliminating direct current offset, and suppressing a static clutter component by using a phasor mean cancellation algorithm; constructing a distance-angle diagram, and positioning a plurality of embryo eggs by adopting a constant false alarm rate (CFAR); phase information of a target is extracted from the preprocessed signal, the heartbeat frequency of the embryo is obtained, and the embryo incubation state is judged in real time in combination with the embryo type and incubation duration. The internal heartbeat frequency of the embryo egg can be accurately detected in real time in a non-contact mode, the incubation state of the to-be-detected embryo is judged, the detection efficiency is effectively improved, and resource consumption is reduced.

This application discloses a method and apparatus for acquiring human feature data. The method includes: using an ultra-wideband (UWB) radar array, the acquisition device performs real-time identification of a target human body within a signal-detectable area, and determines a three-dimensional upper body model for the identified target human body; based on the three-dimensional upper body model, the chest and abdomen region of the target human body is determined, and the chest and abdomen region is detected; based on the set of data points obtained from the detection, a contour model of the chest and abdomen region and monitoring control points in the contour model are determined; the monitoring control points include respiratory monitoring control points and / or heart rate monitoring control points; using the UWB radar array, the chest and abdomen region is detected in real time, and based on the coordinate changes of the detected monitoring control points, the respiratory rate and / or heart rate of the target human body are determined. Using this application can improve the comfort of the user being tested during human feature data acquisition.

The invention relates to a non-inductive interaction intelligent mobile health sign monitoring method and system. The method comprises the following steps: emitting a composite waveform formed by time division multiplexing of a frequency-modulated continuous wave signal and an index modulation orthogonal frequency division multiplexing signal; the receiving end carries out frequency mixing, moving target display filtering, distance dimension fast Fourier transform and phase unwrapping processing on the echo signal, and a phase signal representing thoracic cavity micro-displacement is extracted; a marine predator algorithm with envelope entropy minimization as a fitness function is innovatively adopted, the modal number and penalty factor parameters of a variational modal decomposition model are adaptively optimized, and phase signals are decomposed by using the optimized model; finally, breathing and heartbeat signals are separated from the intrinsic mode function based on the physiological frequency range and the energy screening criterion, and the breathing frequency and the heartbeat frequency are output through spectral analysis. High-precision non-contact vital sign monitoring is realized, and the user experience is remarkably improved.

The invention relates to the technical field of computers, and provides a wearable heartbeat monitoring device and method, and the device comprises a central processing unit, an electrode plate unit, an R wave detection unit, a heartbeat frequency monitoring unit, and a heartbeat abnormity monitoring unit. The electrode slice unit is used for collecting electrocardiosignals of a user in real time; the R-wave detection unit is used for splitting the electrocardiosignal into a plurality of electrocardiosignal segments and carrying out R-wave feature point detection on each electrocardiosignal segment to obtain an R-wave feature point of each electrocardiosignal segment; the heartbeat frequency monitoring unit is used for determining a heartbeat cycle based on the time interval of the R-wave feature points of the two adjacent electrocardiosignal segments and determining the current heartbeat frequency of the user based on a plurality of continuous heartbeat cycles; and the abnormal heartbeat monitoring unit is used for comparing the current heartbeat frequency with a preset normal heartbeat frequency range and judging whether the user is in an abnormal heartbeat state or not. According to the embodiment of the invention, the heartbeat monitoring accuracy and reliability are improved.

The present invention provides a heart rate estimation method based on millimeter wave radar. The method comprises the following steps: sampling a human body by using a millimeter wave radar to obtain a plurality of frequency modulated continuous wave sweep signals; forming a distance-slow time matrix and locating the distance between the human body and the radar; extracting the human body phase by using an inverse tangent function, unfolding the phase whose phase change exceeds a set threshold by using a phase unwrapping function, obtaining the phase difference of adjacent frames, and smoothing the difference exceeding the threshold by using an interpolation method; removing the noise of the smoothed phase signal by using a wavelet transform, and obtaining a reconstructed phase signal; combining an EEMD-ICA method to separate a heartbeat signal, a respiratory signal, a respiratory harmonic and noise in the reconstructed phase signal, and obtaining a heartbeat waveform; constructing a spatial spectrum function by using a multi-signal classification algorithm, and estimating the heartbeat frequency by searching the spectrum peak; the method can accurately separate the heartbeat signal and greatly improve the accuracy of the heartbeat frequency estimation.

The application discloses a walking state vital sign monitoring method and device, equipment and a storage medium, and relates to the technical field of vital sign monitoring. The specific scheme comprises the following steps: determining an anchor distance gate according to the first K frames in N frames of FMCW radar echo signals; performing a processing step on each frame of FMCW radar echo signal after the Kth frame to obtain a plurality of third signals, a plurality of target distance gates, and then determining a plurality of second signals, and then determining a respiratory frequency and a heartbeat frequency and sending the respiratory frequency and the heartbeat frequency to an upper computer to monitor the vital signs of a human body. The processing step comprises the following steps: updating the anchor distance gate according to the target distance gate corresponding to the last frame of the current frame of FMCW radar echo signal; determining the target distance gate according to the plurality of first signals and the anchor distance gate; and determining the third signal according to the plurality of first signals and the target distance gate. The present application can solve the problem that it is difficult to accurately monitor the vital signs of a human body in a walking state, expand the application scenarios of vital sign monitoring, and improve the accuracy of vital sign monitoring.

The application discloses a kind of non-contact multimodal data acquisition and emotion monitoring method, device, system, equipment, medium and product, it is related to emotional recognition technical field.The method is first to start man-machine interaction program and target personnel are interviewed, and receive by millimeter wave biological radar module and audio and video acquisition module in the process of interview the human vital sign signal and audio and video signal collected by target personnel, then on the one hand to human vital sign signal sequentially pre-processing, signal separation processing and frequency estimation processing, obtain respiratory rate and heartbeat frequency, on the other hand to audio and video signal carries out feature extraction processing, obtains audio feature and video feature, finally according to respiratory rate, heartbeat frequency, audio feature and video feature, comprehensive analysis obtains the emotional state of target personnel, thereby can provide high-quality data support for subsequent artificial intelligence emotion early warning and evaluation model establishment, realize higher accuracy and higher reliability of emotional state analysis.

This invention discloses a millimeter-wave radar heartbeat signal extraction method resistant to respiratory harmonic interference. Addressing the challenge of estimation errors caused by high-order harmonics from large-amplitude breathing overlapping the heartbeat frequency in the frequency domain, this invention proposes a time-domain regression cancellation scheme. The method first removes echo clutter and locates the target, acquiring phase micro-motion data; then, empirical mode decomposition (EMD) is used to lock the fundamental respiratory frequency, constructing an interference matrix containing the fundamental frequency and high-order harmonics; subsequently, least squares (OLS) is used for adaptive fitting in the time domain and respiratory harmonics are removed to obtain a clean residual; finally, differential enhancement and adaptive wavelet packet transform (WPD) are combined to reconstruct the weak heartbeat signal. This invention effectively overcomes the shortcomings of traditional frequency-domain filtering in separating overlapping frequencies, eliminates "false positive" interference, and significantly improves the accuracy and robustness of heartbeat monitoring under complex respiratory backgrounds.

The invention relates to the technical field of situation awareness of edge computing, and discloses a grassroots community public security event awareness linkage system based on edge computing, which comprises a plurality of edge devices, state interaction is carried out on a public channel according to the frequency change of heartbeat pulse signals, and when any device makes low-confidence judgment on a potential high-risk event, the potential high-risk event is subjected to state interaction. The method comprises the following steps: when a plurality of devices respond to each other to form channel resonance, instantaneously increasing heartbeat frequency to wake up adjacent devices to carry out cross validation, and when the plurality of devices respond to form channel resonance, completing distributed confirmation of events and generating a linkage instruction. According to the invention, complex event content collaboration among the plurality of edge devices is converted into common perception of a single physical channel state; therefore, the response mode of the system is converted from a passive lag type of waiting for single strong evidence to an active prediction type of gathering multi-point weak evidence, and high-reliability early warning can be completed in the extremely early stage of a disaster.

The present invention discloses a method and system for suppressing respiratory harmonics in a UWB impact bio-radar heartbeat signal, and belongs to the field of human heartbeat signal detection. The method comprises: obtaining the position of respiratory harmonics based on the fundamental frequency of respiration, judging whether the respiratory harmonics and the main peak of the heartbeat coincide with each other through a correlation analysis method, and then determining the respiratory harmonics to be removed; and suppressing each harmonic of respiration using a feedback notch filter optimized by a genetic algorithm. The method causes little loss to the radar heartbeat signal and can automatically remove each harmonic, thereby providing a more refined radar heartbeat signal for extracting cardiac motion features. The method effectively improves notch performance in terms of bandwidth, overshoot, etc., considers the processing method for the coincidence of the respiratory harmonics and the main peak frequency of the heartbeat, and retains the heartbeat frequency component to the greatest extent, thereby providing a new method for radar heartbeat signal extraction and analysis.

The application discloses a kind of respiratory heartbeat detection method, device, equipment and medium.The method comprises: identifying the phase signal of the object to be detected from the target distance image corresponding to the object to be detected;Respectively from the time domain angle and the frequency domain angle, the phase signal is separated, and the corresponding initial time domain signal component and initial frequency domain signal component are obtained;The initial time domain signal component and the initial frequency domain signal component are reconstructed, and the corresponding target frequency domain signal component is obtained;Actual breathing frequency of the object to be detected is obtained based on the target frequency domain signal component, and the actual heartbeat frequency of the object to be detected is obtained by twice harmonic weighting compensation selection to the target frequency domain signal component.The application selects more suitable heartbeat frequency from the target frequency domain signal component by using twice harmonic weighting compensation selection mode, effectively solves the false detection problem of the object to be detected in the interference state, and effectively improves the detection accuracy of breathing and heartbeat frequency.

The embodiment of the invention provides a data processing method, device and equipment, a medium and a program product, which are applied to a data monitoring system, and the method comprises the following steps: collecting operation state data of a data exchange node of a data exchange system based on an initial heartbeat frequency, inputting the operation state data into a state scoring algorithm for state scoring calculation, the method comprises the following steps: acquiring a node state score, comparing the node state score with a score threshold, calculating a target heartbeat frequency according to a comparison result and an initial heartbeat frequency, and performing state data acquisition of a data exchange node according to the target heartbeat frequency, thereby realizing automatic adjustment of a monitoring frequency according to system changes. And the monitoring of the system is more efficient and accurate.

The invention relates to a vehicle-mounted anti-carsickness device and a control method thereof. The device comprises a mask body, a dosing module, an electromagnetic valve, an exhaust fan, an induction module, a control module and a power module. The mask body is provided with an air inlet hole and an exhaust hole which are connected with the electromagnetic valve and the exhaust fan respectively and used for achieving air circulation adjustment. The drug delivery module adopts a pharmacological unit containing peppermint essential oil and an activated carbon filtering unit, and is detachably connected with the mask body through a modular structure, so that drug delivery and air purification are realized. The sensing module is arranged on the wrist of a wearer, physiological data are collected through the skin electric response sensor and the heartbeat frequency sensor, the control module calculates the carsickness index MSI, the working states of the electromagnetic valve and the exhaust fan are regulated and controlled according to the index, and personalized dynamic intervention is achieved. The device is compact in structure and convenient to use, has high real-time response capability and carsickness relieving effect, and is suitable for various vehicle-mounted environments.

The application discloses a design method of an alternating current stimulation Hodgkin-Huxley cardiac Purkinje fiber model, and the dynamic characteristics of the model under different alternating current parameters and different initial conditions are observed through a phase plane orbit, a waveform, a bifurcation diagram and a Lyapunov exponent spectrum, and multiple coexisting membrane action potential modes are revealed, corresponding to the same or different periodic coexisting attractors in a phase diagram. The model experiences period, quasi-period and forward or reverse period-doubling bifurcation with the change of an amplitude A or a frequency f, and it is proved that the cardiac Purkinje fiber model with alternating current injection has complex nonlinear characteristics. By changing a current I m , a sodium ion equilibrium potential E Na and a potassium ion equilibrium potential E K , heartbeat frequency rules are observed, and state conversion of the cardiac Purkinje fiber between normal, abnormal and sudden cardiac arrest is found. The application provides a reference for exploring the evolution rules of nonlinear dynamics in the HH CPF model, protecting life and heart health.

The application provides a kind of millimeter wave radar human heart rate measurement method and system based on respiratory harmonic analysis.The method uses the I / Q signal collected by millimeter wave radar, uses the extended DACM algorithm to obtain phase change information;Then analyze the time domain waveform of vital sign information, calculate the non-symmetry parameter of respiration and the pause parameter of respiratory gap, to analyze the bandwidth of dynamic adjustment notch filter, while suppressing the influence of respiratory harmonic on the heartbeat spectrum;Finally, through the time domain number peak way, the heart rate estimation range is reduced, and the Chirp-Z transform is applied to obtain higher accuracy heartbeat frequency.The heart rate measurement method of the application is simple, and compared with the previous respiratory harmonic elimination method, the strength of respiratory harmonic is more effectively analyzed and targetedly suppressed, and the measurement accuracy when the heart rate and the respiratory harmonic frequency coincide can be effectively improved.

The application discloses a heart rate extraction method based on an adaptive comb filter. The method comprises the following steps: 1, obtaining a life signal by processing a radar echo; 2, extracting a breathing rate and other features therefrom, and initializing parameters of the filter; 3, designing an ALE module for evaluating a filtering effect, and initializing parameters of the module; 4, passing the life signal through the adaptive comb filter, and iterating until the parameters to be optimized are basically converged; and 5, selecting a heartbeat frequency from a spectrum of an output signal of the life signal through the filter. The heart rate extraction method based on the adaptive comb filter considers the intermodulation characteristics of breathing and heart rate components of the life signal in a Doppler radar system, and effectively reduces the interference of breathing and higher harmonics on the selection of the heart rate. The experimental results show that when the higher harmonics of breathing in the life signal affect the measurement of the heart rate, the adaptive comb filter can accurately measure the heart rate of a person to be measured.

The invention discloses an FMCW radar vital sign detection method based on combination of SVMD and SSR. The method comprises the following steps: firstly, acquiring an FMCW radar echo signal, and preprocessing the FMCW radar echo signal to obtain a human chest wall micro-motion phase signal; then, an improved SVMD algorithm is adopted to decompose the human body chest wall micro-motion phase signal, the optimal balance parameter upper limit value is determined through a joint evaluation criterion, and a modal component is obtained; and finally, carrying out harmonic detection and signal reconstruction to obtain a pure heartbeat signal. And constructing an SSR model, performing sparse spectrum reconstruction based on an EB-ZA-SLMS algorithm, solving a heartbeat signal, and extracting a heartbeat frequency. Through joint evaluation of the energy loss rate and the physiological frequency band energy ratio, the optimal balance parameter upper limit value can be adaptively searched according to individual characteristics, and the modal aliasing problem is effectively solved; according to the dynamic sparse reconstruction based on energy perception, the zero attraction intensity can be adjusted in real time according to spectrum energy distribution, and high-resolution and high-robustness heartbeat frequency estimation is realized under a short-time observation window.

The application discloses a millimeter wave radar detection method for identifying multiple life breath and heart rate. The method comprises the following steps: collecting breathing signals and heartbeat signals by using a millimeter wave radar for multiple targets, wherein the collected breathing signals and heartbeat signals are signals of the targets in different distance and different angle scenes relative to the millimeter wave radar; pre-processing the collected breathing signals and heartbeat signals to obtain corresponding frequency spectrum signals, and determining target positions through peak value detection, and then separating the breathing signals and the heartbeat signals; for the separated breathing signals and heartbeat signals, performing spectrum peak search on the frequency spectrum graphs respectively to obtain estimated breathing frequency and heartbeat frequency. The application can effectively adapt to the variable and complex home environment, and improve the accuracy and generalization ability of the breath and heart rate monitoring.

The invention discloses a backrest type millimeter wave radar heart rate monitoring system and method, relates to the technical field of heart rate monitoring, and solves the problems that most of the existing heart monitoring technologies are contact type measurement, and the methods are poor in measurement accuracy due to insufficient comfort, sensitivity to the use environment and the like. And long-term continuous heart activity monitoring of the driver during driving is difficult to realize. The method comprises the following steps: acquiring an echo signal formed by reflecting a frequency-modulated continuous wave signal through a target position; analyzing the echo signal to obtain a displacement curve; performing separation processing on the displacement curve to obtain respiratory frequency and heartbeat frequency; whether early warning is carried out or not is judged based on the breathing frequency and the heartbeat frequency, and the technical problem is solved.

The invention discloses an FMCW radar vital sign detection method combining VMD and SSR. The method comprises the following steps: firstly, transmitting a chirp signal through an FMCW radar, capturing a radar echo signal, preprocessing the radar echo signal, and extracting a human chest wall displacement signal; secondly, decomposing the human chest wall displacement signal by adopting a VMD algorithm, determining an optimal decomposition parameter by utilizing variable step size double-stage search through a vital sign judgment mode, and decomposing the human chest wall displacement signal by utilizing the optimal decomposition parameter to obtain a heartbeat signal and breathing signal modal component set; and finally, judging a breathing harmonic modal component in a heartbeat signal frequency range, and reconstructing a heartbeat signal. And constructing an SSR model, performing sparse spectrum reconstruction on the heartbeat signal based on a ZA-EFRLS algorithm, solving the heartbeat signal, and extracting the heartbeat frequency. The method solves the problems of difficulty in heartbeat signal extraction, clutter interference, insufficient frequency resolution under a short-time observation window, long heartbeat frequency extraction time and the like.