107 results about "Continuous-wave radar" patented technology

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.

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.

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.

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.

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.

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.

A frequency modulated continuous wave radar sensor according to an embodiment of the present invention may comprise: a signal generator for generating frequency modulated (FM) signals that change frequency over time; a transmission antenna for transmitting the FM signals generated by the signal generator; a reception antenna for receiving reflected signals of the FM signals reflected by an object; a frequency mixer which outputs the difference between the FM signals and the reflected signals; and a filter which extracts a mid-frequency component from the output of the frequency mixer.

The invention discloses a multi-dimensional sensing method and system based on low-complexity variational Bayes, and belongs to the technical field of radar signal processing, and the method comprises the steps: employing a frequency modulation continuous wave radar to collect a discrete beat signal containing the distance and radial speed information of a moving target; modeling unknown variables in the discrete beat signal by adopting a low-complexity variational Bayesian algorithm, calculating joint probability density distribution of the unknown variables, and entering iterative updating; the joint probability density distribution related parameters of the unknown variables are updated in sequence, so that the grid point positions corresponding to the distance domain and the Doppler domain are updated; and judging whether the iterative updating is completed or not, and estimating the distance and radial speed information of the moving target according to the updated grid point positions corresponding to the distance domain and the Doppler domain. According to the invention, the problem of performance loss caused by neglecting joint information among target parameters is solved, and a high-precision, all-weather and high-robustness active sensing solution is provided for an intelligent security scene.

A method and device for determining a relative velocity of a radar target. An FMCW radar measurement is carried out in which a ramp-shaped frequency-modulated transmit signal is sent whose modulation pattern includes a first sequence of ramps succeeding one another offset by a time interval and at least one further sequence of ramps succeeding one another offset by the same time interval, the sequences being temporally interleaved. Received signals are mixed down to baseband signals. From the baseband signals, a two-dimensional spectrum is calculated separately for each of the sequences by two-dimensional Fourier transformation, transformation taking place ramp for ramp in the first dimension and transformation taking place via a ramp index in the second dimension. Based on the positions of a peak in at least two of the two-dimensional spectra of the baseband signals, a value is determined for the relative velocity of a radar target.

Systems and methods relate to in-vehicle sensing and classification via frequency modulated continuous wave (FMCW) radar. Radar reflection signals are received based on the radar transmission signals, and include a plurality of chirps across a plurality of frames. Range-FFT data is generated by performing a fast Fourier transform (FFT) on each chirp of a particular frame. Doppler-FFT data is generated by performing the FFT on the range-FFT data. Point cloud data of a radar subject is generated using the Doppler-FFT data. Doppler features, including a velocity of the radar subject, are extracted from the Doppler-FFT data. Classification data is generated to indicate a sensing state inside a vehicle based on the point cloud data and the Doppler features. The classification data includes class data that classifies the radar subject. A system response is generated to provide an action concerning the sensing state inside the vehicle based on the classification data.

The application provides a ranging system and a ranging method. The ranging system comprises: a frequency-modulated continuous wave radar arranged on a trolley, used for transmitting a detection signal when the trolley is in a running process, and receiving at least a return signal emitted from an active radar tag; and at least one active radar tag arranged at a target position, used for receiving the detection signal, modulating the detection signal, generating and transmitting a response signal with a preset frequency offset; wherein the target position is arranged along the running direction of the trolley; wherein the frequency-modulated continuous wave radar is used for determining effective return signals by detecting the frequency modulation characteristics of the response signal, and determining distance information and / or speed information between the target position and the trolley according to beat signals between the return signals and the detection signals. By using the above technical scheme, the target recognition accuracy can be improved, and the implementation cost can be reduced.

A sensor for observing the presence, position and / or movement of an object, such as a waste material (W), in the space of a material conveying pipe (100) or in a temporary storage space (3) of a pneumatic material conveying system, said sensor (S1, S2, S3) comprising means for processing measurement signals of said sensor (S1, S2, S3), such as measuring electronics, and means for transmitting the measurements and / or data relating to the measurements for further processing. The sensors (S1, S2, S3) are radar-based sensors, such as frequency modulated continuous wave MIMO radar-based sensors, configured to detect objects in a monitored space and to detect the presence, position and / or movement of objects in the monitored space. The invention also relates to a method and a pneumatic waste transport system.

This invention discloses a method for inverting atmospheric precipitation particle spectra, belonging to the field of inversion technology. It addresses the limitations of existing technologies in accurately obtaining inversion parameters for ground and atmospheric microphysical parameters, thus hindering understanding of the formation, development, and variation mechanisms of atmospheric cloud precipitation and consequently preventing accurate prediction and interpretation of atmospheric processes and meteorological disasters. The method includes: acquiring the observed power spectrum using C-band frequency-modulated continuous wave radar and employing denoising methods to remove noise levels; constructing the atmospheric power spectrum based on horizontal wind data acquired from wind profiler radar; constructing the raindrop spectrum using ground raindrop data acquired from a ground raindrop spectrometer and a standardized gamma distribution; and performing ground and atmospheric microphysical parameter inversion based on the above results. This invention is used for inverting and obtaining ground and atmospheric microphysical parameters.