138 results about "Continuous-wave radar" patented technology

A linear chirp radar system, apparatus and method use a radar control processing unit to control an LFM radar front end which generates analog-to-digital (ADC) sample signals from one or more target return signals received in response to transmitted linear chirp radar signals, where the radar control processing unit is connected and configured to mitigate range migration by directly filtering the ADC samples using a modified Doppler filter that is tuned to fast-time scaled, slow-time frequencies to generate a focused ADC Doppler cube, and by applying a Fourier Transform on each Doppler cell in the focused ADC Doppler cube to generate a focused range-Doppler cube.

A monitoring system is presented for monitoring vital signs of subject(s). The monitoring system includes a control system configured for signal communication with a frequency modulated continuous wave (FMCW) radar to process measured data which is received from a single-channel front end of receiver of said FMCW radar and which is in the form of data matrix indicative of consecutive beat signals. The control system comprises a data processing utility comprising: a localization module configured and operable to process the measured data indicative of said data matrix and provide support recovery data indicative of the received signals originated at localized one or more subjects; and a vital signs monitoring module configured and operable to analyze the support recovery data and monitor vital signs of said localized one or more subjects.

The invention discloses a frequency modulation continuous wave radar multi-target dynamic separation and anti-interference method and system based on synchronous extraction transformation, and the method comprises the steps: S1, generating a linear frequency modulation continuous wave, and transmitting a high-frequency signal through a radio frequency front end; s2, receiving a target reflection signal, mixing the target reflection signal with the emission signal through a mixer, extracting an intermediate frequency beat signal, and performing denoising; s3, performing time-frequency decomposition on the signal by adopting synchronous extraction transformation to generate a high-resolution time-frequency distribution matrix; s4, separating overlapped targets based on the time-frequency matrix by adopting a density clustering algorithm, eliminating a distance-speed coupling error in combination with a dynamic decoupling compensation algorithm, and outputting a time-frequency track of an independent target; constructing a dynamic time-frequency domain mask filter to filter noise, and optimizing the detection sensitivity and performing false alarm control through an adaptive threshold detection mechanism; according to the method, dense targets are accurately separated through high-resolution time-frequency analysis, and the anti-interference capability and the dynamic target tracking precision are improved in combination with a dynamic Doppler decoupling algorithm.

A mechanism for generating a modulation signal for use in a radar system. The modulation signal includes a sequence of chirps. Each chirp includes an active period, a transition period and an idle period. During the active period, the frequency of the chirp moves from a start frequency to an end frequency. During the transition period, the frequency of the chirp moves towards the start frequency of the next chirp. The rate of change of the frequency, during the transition period, is different for different chirps of the modulation signal.

A radar device may generate an integrated range-velocity map by combining data from a plurality of range-velocity maps. Each range-velocity map may be associated with a respective radar channel from a plurality of radar channels. The radar device may identify a first peak in the integrated range-velocity map. The first peak may indicate one or more radar targets in the integrated range-velocity map and being identified by a first bin having a first range-velocity bin index. The radar device may determine a first data set by extracting, from each range-velocity map, data that is included in a respective bin associated with the first range-velocity bin index. The radar device may process the first data set to determine a first set of phase imbalances associated with the plurality of radar channels.

A linear chirp radar system, apparatus and method use a radar control processing unit to control an LFM radar front end which includes a frequency-scanning transmit antenna and a frequency-scanning receive antenna which respectively sweep a transmit and receive energy focus across an angle space with each linear chirp signal, where the radar control processing unit processes digital output signals generated from target return signals received in response to transmitted linear chirp signals and extracts target range-angle information by applying time-frequency analysis processing to the digital output signals to generate a first range-angle map which includes range-biased angle information, and then applying a group delay compensation process to generate a second range-angle map which includes target range-angle information that is generated by selectively adjusting the range-biased angular information in the first range-angle map with an angular adjustment.

The invention discloses a fractional frequency division frequency synthesizer with output signal phase synchronization and frequency modulation continuous wave functions, and the basic structure is a charge pump phase-locked loop. Comprising a phase frequency detector, a first charge pump, a second charge pump, a low-pass filter, a voltage-controlled oscillator, a first buffer, a second buffer, a two-frequency divider chain, an IQ undersampling circuit, a local oscillator generator, a programmable multimode frequency divider, a Delta-Sigma modulator (DSM), a first selector, a second selector, a third selector, a tracking phase accumulator, a numerical control oscillator, an accumulation phase difference register and an atan2 logic circuit. The device comprises a main phase control circuit, a phase adjusting circuit, an enabling control circuit, a waveform generator and a serial peripheral interface. The decimal frequency-division frequency synthesizer can be applied to a general-inductance integrated system, ensures that output signals provided by a plurality of decimal frequency-division frequency synthesizers are consistent in phase in a multi-channel radio frequency transceiving system adopting a multi-chip splicing mode, and can also be applied to the general-inductance integrated system as a sensing signal source; and the speed and the distance of an object can be quickly sensed by the high linearity and the quick chirp capability of an output signal. The decimal frequency division frequency synthesizer is applied to a linear frequency modulation continuous wave radar system, initial phase synchronization can be carried out firstly, then frequency continuous modulation is carried out, and measurement errors can be eliminated. In view of functional similarity of partial modules of the synchronous loop and the FMCW loop, such as a phase frequency detector, a charge pump, a voltage-controlled oscillator and the like, the modules can be shared, so that the power consumption and area cost of the system are remarkably reduced.

The invention discloses a continuous wave high-isolation transceiving phased-array antenna, belongs to the technical field of phased-array antennas, and solves the problem of how to improve the isolation of the transceiving phased-array antenna. Comprising a metal floor, and a transmitting phased array, a receiving phased array and a choke groove which are arranged on the upper surface of the metal floor; the choke groove is arranged between the transmitting phased array and the receiving phased array; the choke groove comprises a first isolation plate and a second isolation plate; the first isolation plate and the second isolation plate are arranged in parallel along the y axis, a wave-absorbing material is arranged on one surface, far away from the second isolation plate, of the first isolation plate, and a wave-absorbing material is arranged on one surface, far away from the first isolation plate, of the second isolation plate; according to the invention, the isolation degree between the continuous wave transmitting and receiving array surfaces is improved by optimizing the array layout and pasting the wave absorbing material on the double-layer isolation plate, and the antenna can be widely applied to a continuous wave radar system, can meet the isolation degree requirement of the antenna in different scanning states, and has good engineering application value.

The invention relates to the technical field of laser radars, in particular to a non-aliasing frequency-modulated continuous wave radar detection system and method, and the system comprises a light source, a beam splitter, a circulator, a 90-degree mixer, a signal conversion module and a signal processing unit. The signal processing unit is configured to construct a composite vector signal S based on the first electric signal I and the second electric signal Q, S = I + jQ, j is an imaginary part operator, obtain a double-sideband spectrum based on the composite vector signal S, determine the frequency of a signal peak in an upper frequency sweeping period and the frequency of a signal peak in a lower frequency sweeping period in the double-sideband spectrum, and determine the frequency of the signal peak in the upper frequency sweeping period and the frequency of the signal peak in the lower frequency sweeping period; and obtaining the distance and speed of the target to be measured based on the frequency of the signal peak in the upper frequency sweeping period and the frequency of the signal peak in the lower frequency sweeping period. According to the invention, the problem of signal aliasing during detection of the to-be-detected target can be solved at least.

A TDM MIMO FMCW radar comprises at least one row of physical receivers with a first spacing (dr) in a first direction, and further comprises a plurality of physical transmitters arranged with a second spacing (dt) in said first direction. To determine whether a peak in an angle spectrum corresponds to a direct reflection or a first-order multipath artefact, an inverse phase-shift vector corresponding to a phase ({circumflex over (ϕ)}1) of the peak is applied and a constant signal with the amplitude of the peak is subtracted. To the thus obtained intermediate signal (v), a further inverse phase-shift vector—now corresponding to an offset phase (Δ{circumflex over (ϕ)}) of the two leading peaks of the angle spectrum—after which a constant signal is subtracted. It is then detected whether the thus obtained test signal (w) has any non-noise content. If yes, the peak corresponds to a multipath artefact, and otherwise to a direct reflection.

The invention discloses a non-contact electrocardiosignal measuring device and a measuring method thereof, and relates to the technical field of radar signal detection, the non-contact electrocardiosignal measuring device comprises a multi-domain joint modulation micro-motion signal deentanglement module and a signal reconstruction network based on time-frequency domain transformation; the multi-domain joint modulation micro-motion signal de-entanglement module is configured to receive a radar waveform obtained by electrocardiosignal acquisition by a millimeter wave frequency modulation continuous wave radar and extract a heart mechanical motion signal from the radar waveform; the signal reconstruction network based on time-frequency domain transformation is configured to receive the extracted heart mechanical motion signal, learn and construct a nonlinear relation between the heart mechanical motion signal and the electrocardiosignal, and output a predicted electrocardiosignal according to the heart mechanical motion signal. The problem of how to extract the heart mechanical motion signal by using a radar technology and avoid a noise signal generated by interference factors is solved, and the predicted electrocardiosignal is obtained through the heart mechanical motion signal.

The invention relates to a radar data correction method and device, computer equipment and a storage medium. The method comprises the steps of determining an installation deviation angle of an external meteorological station according to a fitting result of an azimuth angle and a radial wind speed in multiple groups of first radar data measured by a continuous wave radar in a preset period; according to the installation deviation angle, symbol information of radial wind speed in each group of first radar data is determined; and performing motion correction on the first radar data according to a preset turbulence correction algorithm and inertia measurement data measured by an inertia measurement unit to obtain target radar data. The method can improve the accuracy of wind direction and wind speed measurement results.

An indoor optimization positioning method of an MIMO frequency modulation continuous wave radar comprises the following steps: after a data matrix is generated based on an echo signal after analog-to-digital conversion, filtering an environment static target and radio frequency leakage by using a time domain filtering technology, and after the data matrix after the time domain filtering is carried out, carrying out indoor optimization positioning on the MIMO frequency modulation continuous wave radar based on the data matrix after the time domain filtering; the actual distance between the target and the radar is calculated through distance dimension fast Fourier transform, the speed Doppler of the target relative to the radar is calculated through speed fast Fourier transform, so that a distance Doppler spectrum is generated, after the signal-to-noise ratio is increased through multi-channel data incoherent accumulation, the total number of the targets is estimated through a constant false alarm rate (CFAR) algorithm, and the distance Doppler spectrum is obtained. Obtaining distances and speeds corresponding to different target points; and finally, angle estimation is carried out on each point on the CFAR through a super-resolution solution angle algorithm (ESPRIT) to obtain angle information, distance, speed and angle data matching is carried out through digital beam forming (DBF), distance, angle and speed data of a corresponding target are obtained, and a two-dimensional coordinate of the target is correspondingly obtained. According to the invention, the number of human body target point clouds can be increased while human body coordinates, speed and angle information are accurately obtained, and the method has the advantages of high interference resistance, low requirement on the signal-to-noise ratio of data and low dependence degree on the external environment.

A system may include a radar-based tracking system, an image-based tracking system, one or more processors, and one or more computer-readable recording media that store instructions that are executable by the one or more processors to configure the system to: (i) obtain, via the radar-based tracking system, radar-based measurement data; (ii) utilize the radar-based measurement data as input to an event detection module to generate event detection output; and (iii) when the event detection output satisfies one or more conditions, selectively activate the image-based tracking system to enable acquisition of image-based tracking data to facilitate positional tracking of an object.

The invention provides an auxiliary identification method and device for single-phase depression and double-phase depression. The method comprises the steps that a millimeter wave frequency modulation continuous wave radar is used for collecting thoracic cavity micro-motion signals of a subject in a non-contact mode; filtering and phase demodulation are carried out on the thoracic cavity micro-motion signal, respiration components and heartbeat components are separated, and an RR interval sequence is extracted from the heartbeat components; calculating heart rate variability characteristics according to the RR interval sequence, wherein the heart rate variability characteristics comprise a time domain index, a frequency domain index and a nonlinear index; and inputting the heart rate variability characteristics into a pre-trained auxiliary identification model to obtain a depression identification result of the subject. According to the invention, a non-contact measurement method is adopted, so that stress reaction possibly caused by a contact sensor is avoided, and interference to physiological signals is reduced; and meanwhile, complex features in the data can be automatically extracted by using a deep learning model, so that the identification accuracy and generalization ability are improved.

A phased array frequency-modulated continuous-wave (FMCW) radar system configured to transmit, using a plurality of antennas, a plurality of chirps, wherein each chirp within the plurality of chirps includes at least one temporal characteristic, and wherein the at least one temporal characteristic is pseudo-random for a portion of the plurality of chirps, to receive, using the plurality of antennas, a plurality of chirp reflections off one or more targets, to create, using a mixer, an intermediate frequency based on the plurality of chirps and the plurality of chirp reflections, and to determine, based on the intermediate frequency and the at least one temporal characteristic, a target attribute associated with the one or more targets.

The present invention relates to an array antenna for two-dimensional interferometric angle measurement of continuous wave radar, belonging to the field of antenna technology. It comprises a transmitting horn antenna, seven receiving horn antennas, a partition wall and an isolation bottom plate. A transmitting horn antenna and seven receiving horn antennas constitute the array surface of the array antenna, wherein the transmitting horn antenna is located at the upper right corner of the entire array surface, and the seven receiving horn antennas form an L shape and are located at the lower left corner of the entire array surface; the pitch and azimuth dimensions each include four receiving horn antennas, and the receiving horn antenna at the apex of the L shape is shared by the azimuth and pitch dimensions. The isolation wall and the isolation bottom plate can improve the isolation between the transmitting and receiving antennas, the transmitting horn antenna transmits electromagnetic wave signals, and the seven receiving horns are arranged at a certain interval to receive target echo signals, and the azimuth and pitch dimensions are measured by double baselines.

The invention discloses a terahertz frequency modulation continuous wave radar signal processing system and method based on an FPGA. The system comprises an A / D acquisition control module, a digital down-conversion module, a fast two-dimensional Fourier transform module, a non-coherent accumulation module and a constant false alarm detection module. The method comprises the following steps that: the A / D acquisition control module samples an analog echo signal; the digital down-conversion module performs digital down-conversion processing on the sampling signal to obtain baseband echo I and Q data; the fast two-dimensional Fourier transform module is used for carrying out FFT (Fast Fourier Transform) on baseband echo I and Q data to obtain a range profile of a target, and the non-coherent accumulation module is used for carrying out amplitude accumulation and averaging on a plurality of target range profiles in different periods in the same wave beam; and the constant false alarm detection module compares and judges the signal amplitude of the detection unit with a set threshold to obtain a false alarm detection result. The method has the advantages of being high in real-time performance, high in reliability, simple in design, high in adaptive capacity and wide in application range.

According to the wind turbine generator blade icing dynamic early warning system provided by the invention, through omnibearing monitoring of the frequency modulation continuous wave radar group, the orthogonal weaving piezoelectric fiber array and the infrared temperature measurement unit, airspace water drop distribution, blade vibration characteristics and multi-dimensional dynamic changes of a surface temperature field are accurately captured; by combining improved Kalman filtering, wavelet transformation and a dynamic weight distribution algorithm of an intelligent decision module, traditional single threshold judgment is upgraded to comprehensive threat index deduction based on digital twinborn bodies, and the temporal-spatial resolution and reliability of icing threat assessment are remarkably improved; the execution control module achieves heating network partition accurate regulation and control and unit operation state collaborative optimization according to the generated anti-icing strategy, energy waste of traditional global heating is avoided, material damage caused by local overheating or underheating is effectively restrained, finally, anti-icing energy consumption is reduced under the complex meteorological condition, and the anti-icing efficiency is improved. And meanwhile, the power generation efficiency loss of the unit under the icing working condition is greatly reduced.

A system and method are provided for emulating an echo signal reflected from a diffuse target, having an indeterminate shape and range in a radar environment, in response to a frequency-modulated continuous-wave (FMCW) radar signal transmitted by a radar under test. The method includes receiving the FMCW radar signal from the radar under test, the FMCW radar signal having radar signal frequencies linearly modulated between a first frequency and a second frequency; generating a bandlimited noise-like signal having frequencies within predetermined frequency limits, and a spectral shape such that amplitudes of the noise-like signal vary in a predetermined manner with respect to the frequencies; mixing the noise-like signal with the received FMCW radar signal to provide an emulated echo signal reflected from the diffuse target; and transmitting the emulated echo signal of the diffuse target to the radar under test.

Embodiments are disclosed for a range-gated imager. In some embodiments, a method comprises: transmitting, with a single-tone continuous wave (STCW) radar, a signal; receiving, with the STCW radar, a return signal from a projectile impinged by the radar signal; counting, with a measuring apparatus, a specified number of periods of non-ambiguity range based on the return signal, performing a flashing operation; and gating or triggering, by the measuring apparatus, an imager to capture an image of the projectile in response to the count reaching the specified number of periods.

The present application relates to the technical field of laser radar, and especially relates to a non-aliasing frequency modulation continuous wave radar detection system and method, the non-aliasing frequency modulation continuous wave radar detection system comprising: a light source, a beam splitter, a circulator, a 90-degree frequency mixer, a signal conversion module and a signal processing unit, the signal processing unit being configured to: construct a complex vector signal S based on a first electrical signal I and a second electrical signal Q, S=I+jQ, wherein j is an imaginary operator, and obtain a double sideband spectrum based on the complex vector signal S, determine the frequency of a signal peak in an up-sweeping frequency period and the frequency of a signal peak in a down-sweeping frequency period in the double sideband spectrum, and obtain the distance and speed of a target to be detected based on the frequency of the signal peak in the up-sweeping frequency period and the frequency of the signal peak in the down-sweeping frequency period.The present application is at least beneficial to solve the signal aliasing problem when detecting the target to be detected.

The invention discloses an unmanned aerial vehicle detection method, system and device based on a multifunctional radar and a medium, and relates to the technical field of unmanned aerial vehicle target detection, and the method comprises the steps: obtaining the detection position of an unmanned aerial vehicle target when a search result is that the unmanned aerial vehicle target exists; judging the area of the unmanned aerial vehicle target according to the detection position; when the judgment result is the early warning area, obtaining positioning information of the unmanned aerial vehicle target through radar equipment in a continuous wave radar working mode; when the judgment result is that the unmanned aerial vehicle is in the other area, obtaining the positioning information of the unmanned aerial vehicle target through the radar equipment in the phased array working mode; when the judgment result is a critical area, performing joint positioning according to the target information in the phased array working mode and the target information in the continuous wave radar working mode to determine the positioning information of the unmanned aerial vehicle target; the method solves the problems that a traditional anti-no phased array radar has a distance blind area and is poor in positioning precision, and can flexibly adapt to the positioning requirements of illegal unmanned aerial vehicles in different scenes.

Embodiments are disclosed for a range-gated imager. In some embodiments, a method comprises: transmitting, with a single-tone continuous wave (STCW) radar, a signal; receiving, with the STCW radar, a return signal from a projectile impinged by the radar signal; counting, with a measuring apparatus, a specified number of periods of non-ambiguity range based on the return signal, performing a flashing operation; and gating or triggering, by the measuring apparatus, an imager to capture an image of the projectile in response to the count reaching the specified number of periods.

This disclosure provides a radar module, i.e., a radar system, comprising a PCB substrate, at least two antenna elements, and a radar chip. The difference in the feed path from the radar chip to two adjacent antenna elements is related to the offset angle of the radar module's main radiation direction. The technical solution provided in this disclosure adjusts the deflection of the radar module's main radiation direction through feed path layout design, and, in conjunction with logic algorithms, enables fixed-frequency continuous wave radar to detect and identify moving objects. The technical solution provided in this disclosure is designed based on a shared antenna array for both transmit and receive channels, meeting the requirements for lightweight and integrated design, effectively reducing the size of the radar module, and has widespread applicability.

The invention discloses a report generation method for a non-contact radar cardiac oscillogram, and relates to the technical field of radar perception. The method comprises the steps that S1, a data set is constructed, wherein synchronous data of continuous wave radar cardiac signals and electrocardiosignals are collected, and an image-text pair data set is constructed; s2, network structure construction: providing a multi-stage deep neural network structure oriented to image semantic generation, wherein the multi-stage deep neural network structure comprises an image feature coding module, a time sequence modeling and attention fusion module and a language generation module; s3, a loss function is designed, wherein a cross entropy loss function is adopted to quantify the difference between prediction output and a real label; and S4, model training and verification: in combination with the operations of S1 to S3, constructing a report generation model of the radar cardiac oscillogram, and designing a complete model training and verification process. The method has a wide application prospect in radar cardiac image subtitle generation tasks, and can provide powerful support for understanding and description of radar cardiac image contents.

The invention discloses a method for tracking an unknown multi-target motion track in a non-line-of-sight scene, and the method comprises the steps: collecting a target echo signal in a non-line-of-sight region through employing a frequency modulation continuous wave radar, carrying out the preprocessing of the echo signal, and obtaining a time distance map containing the motion features of a human body target; an improved self-adaptive trace extraction algorithm based on gridding and conditional constraint is adopted to extract a target motion trace; by adopting the fusiform front trace energy suppression algorithm provided by the invention, cross interference among different traces is reduced; according to the Doppler consistency in the trace segments and the Doppler similarity between the traces, trace attribution judgment and target attribution judgment are completed, and meanwhile target counting is completed; determining each multi-path echo order by adopting a trace order matching algorithm; and an elliptical cross positioning algorithm is adopted, and a multipath propagation model is combined to complete target positioning and reconstruct a target motion trail. The method is suitable for tracking unknown multi-target motion tracks in a non-line-of-sight scene, has the advantages of no need of target prior information, high robustness, high precision and the like, and can be widely applied to the fields of automatic driving, security monitoring, disaster rescue and the like.

A method and apparatus for super-resolution localization of multiple targets using frequency-modulated continuous wave radar includes: determining the number K of targets based on the number of eigenvalues ​​satisfying a condition in the covariance matrix of the acquired radar array signal; finding the frequency values ​​corresponding to the K largest spectral peaks based on the acquired number of targets K, using these frequency values ​​as coarsely estimated intermediate frequency (IF) values, and determining the final IF value using the coarsely estimated IF values; calculating the distance of the corresponding target relative to the center O of the antenna array based on the final IF value; obtaining the noise subspace of the array signal and the steering vector related to the target distance and angle based on the eigenvalues ​​of the covariance matrix of the array signal, constructing a MUSIC spectral function, and determining the estimated value of the target echo signal direction; and then determining the position of the corresponding target. This invention has higher range and angle resolution and lower algorithm complexity, enabling super-resolution localization of multiple targets.

A method utilizing a radar apparatus and a radar apparatus. The invention relates to a method for determining a distance between a radar device and an object by means of a frequency-modulated continuous wave radar using a radar device. The aim of the invention is to reduce the energy demand for determining the distance without affecting the accuracy. The task is solved by a method comprising the following steps: carrying out the sub-steps in a first step: generating and emitting a frequency-modulated transmission signal; receiving a reflected signal at the object caused by the transmitted signal; and mixing the transmitted signal and the reflected signal with each other to form a mixed signal. In a second step, a sub-step is performed: determining a coarse spectrum of the mixed signal in a coarse frequency range, a spectrum maximum in the coarse spectrum, and a coarse spectrum maximum frequency of the spectrum maximum in the coarse frequency range.

The present disclosure provides methods and systems for radar detection of coordinated interference using artificially introduced phase ramps. A radar device transmits a frequency modulated continuous wave (FMCW) radar waveform having artificially introduced phase ramps on a plurality of chirps within each of a plurality of frames. The radar device receives a signal including a reflection of the FMCW radar waveform. The radar device calculates respective distances and respective velocities of the one or more detected objects based on phases of chirps in the received signals. The radar device attempts to associate each of the one or more detected objects with a trajectory based on the respective distance and the respective velocity. The radar device discards one or more detected objects or corresponding trajectories in response to a change in speed between frames of the detected objects being greater than a threshold.