43 results about "Doppler processing" patented technology

An object tracking method based on radar point cloud includes the following steps: performing range processing, Doppler processing, and angle processing on a digital signal to obtain a first point-cloud image; recognizing whether there is a first cluster in the first point-cloud image; and recording a first location of the first cluster in response to recognizing that there is the first cluster in the first point-cloud image; or performing range processing and angle processing on the digital signal to obtain a second point-cloud image in response to recognizing that there is not the first cluster in the first point-cloud image; recognizing whether there is a second cluster at a corresponding recorded first location in the second point-cloud image; and recognizing that a tracking target is in a static state in response to recognizing that there is the second cluster at the first location.

The invention relates to the technical field of radar information, in particular to a ground clutter suppression method for a ground reconnaissance radar, which comprises the following steps of: firstly, establishing a clutter profile map by using echo data, judging information inside and outside a clutter according to the clutter profile map, and selecting different signal processing flows, namely, adopting a detection channel 1 outside the clutter, adopting a detection channel 2 and a detection channel 3 inside the clutter and adopting a detection channel 2 and a detection channel 3 outside the clutter; after the detection channel 1 passes through the MTD filter, clutter suppression processing is not carried out, and a detection result is output; the detection channel 2 is a coherent processing channel, firstly performs mean filtering processing, then performs coherent processing, performs clutter suppression processing through phasor mean filtering, and outputs a detection result; and the detection channel 3 is a zero Doppler processing channel and is used for detecting a low-speed target in a clutter area, compared with the prior art, the method can reduce Doppler sidelobes as much as possible on the premise of ensuring that the ground clutter height is suppressed, and has the minimum main lobe width and the minimum signal-to-noise ratio loss.

The application discloses a dual-channel parallel detection airborne phased array radar ground moving target extraction method, comprising the following steps: acquiring coherent pulse train data of an airborne phased array radar; forming sum-difference beam data according to preset sum-difference beam weighting coefficients; constructing a pulse compression matching function to perform pulse compression on the sum-difference beam data; performing platform motion compensation and pulse Doppler processing on the pulse compressed sum-difference beam data; performing high-speed channel determination according to amplitude statistical results of each Doppler unit of the sum beam, and performing CFAR detection; performing low-speed channel determination according to the amplitude statistical results of each Doppler unit of the sum beam, processing low-speed channel data by using sum-difference 3DT-STAP algorithm, and performing CFAR detection and amplitude normalization processing on the processed data; merging the CFAR detection results of the high-speed channel data and the CFAR detection and amplitude normalization processing results of the low-speed channel data, and extracting a point track.

Methods and apparatus for providing self-contained guidance, navigation, and control (GN&C) functions for a vehicle moving through an environment on or near the ground, in the air or in space without externally provided information are disclosed. More particularly, one embodiment of the present invention includes a Heading Sensor (36), an Absolute Location Sensor (38), a timer (40), a Range Doppler Processor (42), a Navigation Reference Sensor (44), an Area Range and a Velocity Sensor (46) which provide enhanced navigation information about a universal reference frame (22) and one or more targets (20).

The invention discloses a fan structure deformation monitoring method based on distributed millimeter-wave radars, and relates to the technical field of detection, and the method comprises the steps: arranging at least two millimeter-wave radar nodes at the bottom of a fan tower in a non-intrusive manner, and controlling the emission time sequence of each radar through a unified PWM trigger signal and a preset time delay matrix, co-frequency interference is eliminated, and multi-radar cooperative detection is ensured; performing distance-Doppler FFT processing on echo signals acquired by each radar node, generating local point cloud data in combination with incoherent accumulation and a constant false alarm detection algorithm, and converting polar coordinates into rectangular coordinates to form a three-dimensional point cloud model; performing iterative registration on the local point clouds of the multiple radar nodes based on an ICP algorithm, unifying the local point clouds to a global coordinate system of a fan tower footing, and fusing to generate a complete fan structure three-dimensional point cloud field; and calculating a point-to-point distance difference between the historical reference point cloud and the current point cloud, counting a mean value and a maximum value, and judging whether deformation early warning is triggered or not according to a preset threshold value.

Methods and apparatus for providing self-contained guidance, navigation, and control (GN&C) functions for a vehicle moving through an environment on or near the ground, in the air or in space without externally provided information are disclosed. More particularly, one embodiment of the present invention includes a Heading Sensor (36), an Absolute Location Sensor (38), a timer (40), a Range Doppler Processor (42), a Navigation Reference Sensor (44), an Area Range and a Velocity Sensor (46) which provide enhanced navigation information about a universal reference frame (22) and one or more targets (20).

Methods and apparatus for providing self-contained guidance, navigation, and control (GN&C) functions for a vehicle moving through an environment on or near the ground, in the air or in space without externally provided information are disclosed. More particularly, one embodiment of the present invention includes a Heading Sensor (36), an Absolute Location Sensor (38), a timer (40), a Range Doppler Processor (42), a Navigation Reference Sensor (44), an Area Range and a Velocity Sensor (46) which provide enhanced navigation information about a universal reference frame (22) and one or more targets (20).

Methods and apparatus for providing self-contained guidance, navigation, and control (GN&C) functions for a vehicle moving through an environment on or near the ground, in the air or in space without externally provided information are disclosed. More particularly, one embodiment of the present invention includes a Heading Sensor (36), an Absolute Location Sensor (38), a timer (40), a Range Doppler Processor (42), a Navigation Reference Sensor (44), an Area Range and a Velocity Sensor (46) which provide enhanced navigation information about a universal reference frame (22) and one or more targets (20).

The invention relates to a photonic radar system (100) and a method for operating a photonic radar system (100). The invention further relates to a central unit (10) and a method for operating the central unit (10). The invention relates to reducing the computational effort required for Doppler processing in sparsely distributed antenna apertures by incorporating uniform linear array (ULA) structures (70).

Described are techniques for interleaving range and Doppler radar processing. A data cube is memory accessed differently, from one look period to the next, which allows Doppler processing for a current look period to happen in parallel with range processing for a next look period. Range processing for a first look period writes to rows of the data cube; Doppler processing reads from and empties its columns. But before Doppler processing can finish, a second look period begins. Rather than re-writing to the rows, range processing in the second look period writes to the columns just emptied by the ongoing Doppler processing. Doppler processing for the first look period is allowed to finish by executing during processing idle times in the second period, e.g., in-between chirps. With better processor utilization, Doppler processing is afforded more time to do its complex operations, while keeping look periods as short as possible.

The invention discloses a millimeter wave radar array-based wind field fan blade integrated monitoring method, which comprises the following steps of: generating a point cloud observation result by performing range direction and Doppler processing on observation data acquired by a millimeter wave radar array at the top of a cabin, and constructing an echo energy time sequence in a fan blade area; and determining the sweep-over period of the fan blade through peak detection. A time slot control sequence is constructed, a fan blade occupation time period is used for point cloud reconstruction, and a non-shielding time period is used for wind measurement. In a fan blade point cloud reconstruction time slot, reconstructing a fan blade point cloud through methods of multi-channel signal synthesis, threshold detection, angle estimation and the like, and extracting blade state parameters; in a wind measurement time slot, a wind speed vector inversion model is established through multi-sight radial speed observation, and the wind speed and the wind direction are obtained by adopting a weighted fusion method. And fusing and outputting the fan blade state parameters and the wind field parameters in a unified coordinate system and a time axis. According to the method, additional wind measurement equipment is not needed, and integrated, continuous and high-reliability monitoring of the wind field and the fan blades is achieved.

The application relates to the field of radar technology and provides a method and device for resisting towed interference of an airborne radar. The method comprises the following steps: constructing sum channel data, azimuth difference channel data and elevation difference azimuth data of echo signals; constructing sum-difference three-channel data of each pulse according to the sum channel data, the azimuth difference channel data and the elevation difference azimuth data; processing the sum-difference three-channel data by using a blind source separation algorithm to obtain target echo channel data and a separation matrix; pulse compressing the target echo channel data to obtain a target distance estimation value; determining an azimuth angle and an elevation angle of a target according to the target echo channel data and the separation matrix; and constructing a target echo matrix by using target echo channel data of each pulse, and performing Doppler processing on the target echo matrix to obtain a target speed estimation value. The application can resist towed interference, determine the distance, the azimuth angle, the elevation angle and the speed of the target, and realize effective detection of the target.

The application discloses a kind of wind field wind blade integrated monitoring method based on millimeter wave radar array, comprising: by the observation data obtained by millimeter wave radar array on the top of cabin is carried out distance and doppler processing, generate point cloud observation result, and construct echo energy time sequence in wind blade area, determine wind blade sweep period by peak value detection.Construct time slot control sequence, wind blade occupation period is used for point cloud reconstruction, unobstructed period is used for wind measurement.In wind blade point cloud reconstruction time slot, reconstruct wind blade point cloud by multi-channel signal synthesis, threshold detection and angle estimation etc., and extract blade state parameter;In wind measurement time slot, by multi-view radial velocity observation, establish wind speed vector inversion model, and obtain wind speed and wind direction by using weighted fusion method.Wind blade state parameter and wind field parameter are fused and output under unified coordinate system and time axis.The method does not need additional wind measurement equipment, realizes the integration, continuity and high reliable monitoring of wind field and wind blade.

A method and apparatus for radar sensing in a disaggregated radio access network. The apparatus includes interface circuitry to receive data from a radio unit and processing circuitry to perform radar sensing processing on the received data to determine at least one of range, velocity, or direction of at least one target in an environment. The radar sensing processing includes range processing, Doppler processing, two-dimensional range-Doppler periodogram processing, constant false alarm rate (CFAR) detection processing, angular resolution processing, and post processing. The data received from the radio unit is beam domain data obtained by receive beamforming, and the processing circuitry is configured to perform decompression processing for converting the beam domain data to antenna domain data and perform at least the angular resolution processing and the post processing on the antenna domain data. The processing circuitry may perform the decompression processing after the CFAR detection processing.

The invention provides a target distance Doppler processing method and device and a storage medium, and the method comprises the steps: carrying out the pulse sampling of a radar echo signal of a target, and determining radar observation data in a one-dimensional vector form; reconstructing the radar observation data according to the number of pulses and the number of sampling times when pulse sampling is carried out on the radar echo signal, and determining a two-dimensional observation matrix corresponding to the radar observation data; the sampling frequency is greater than the pulse number; dividing the two-dimensional observation matrix into a plurality of batches of reconstruction signals according to computing power parameters of the GPU; each batch of reconstruction signal comprises multiple columns of data in the two-dimensional observation matrix; and performing distance Doppler signal recovery processing on the reconstructed signals of each batch in parallel by using a GPU, determining a target recovery signal corresponding to the reconstructed signals of each batch, and determining a distance Doppler processing result corresponding to the target according to the target recovery signals of each batch. By adopting the technical scheme of the invention, the efficiency of distance Doppler processing can be improved.

A radar system that uses a range walk compensation algorithm to reduce system losses resulting from moving targets. During the coherent integration of pulse radar systems, the conventional Fast Fourier Transform (FFT) for Doppler processing needs to change the input range bin number in accordance to the velocity of the target. The algorithm allows for configuration of Doppler groups to compute several Dopplers with one FFT. Each Doppler group has a transform Doppler that is close to the center of the group which will dictate the change of range bins for the input data to the FFT. As the range bins are changed, there are two input filter techniques: nearest bin select, and 2-tap filter. After range walk compensation processes all Doppler groups by FFT, the resultant output block has much higher coherent integration as compared to just a conventional FFT.

The invention relates to the technical field of radar speed measurement, and discloses a radar speed measurement method based on gain control, comprising the following steps: S1, system initialization and gain calibration: pre-testing loop stability; s2, signal transmitting and echo receiving: transmitting and receiving a dynamic gain control echo signal; s3, high-speed signal acquisition and synchronization: acquiring I / Q channel data; s4, Doppler processing and dynamic gain compensation: Doppler frequency is extracted; s5, Doppler peak value detection and speed calculation: detecting a target peak value, and calculating a target speed; s6, dynamic performance verification: carrying out a multi-target scene test and an anti-interference test; s7, boundary condition robustness test: carrying out extreme environment test and overload recovery test; and S8, calibrating and outputting data. Through real-time gain compensation of digital automatic gain control and robust Doppler processing, high-precision speed measurement can still be realized under the conditions of strong clutter, interference and rapid gain change, the stability is good, and the influence of the environment is small.

The embodiment of the application discloses a kind of parameter estimation method, device and medium of airborne distributed MIMO radar system, belong to radar signal processing technical field;Including: the system model of airborne distributed MIMO radar is constructed;The echo signal received by receiver airborne platform is matched filtering and Doppler processing, and the rough estimation of the distance and Doppler shift of target is obtained;According to the rough estimation of distance and Doppler shift, the maximum likelihood function of echo signal is solved by one-dimensional search of time delay and Doppler shift respectively, and the optimal estimation of time delay and Doppler shift is obtained respectively.The method can give the mathematical model of airborne distributed MIMO radar system, based on maximum likelihood algorithm and the rough prior information of time delay-Doppler shift, the target parameter is accurately estimated by one-dimensional search of parameter, and the operation amount of parameter estimation is reduced.

Various embodiments of the present disclosure relate to gathering training data for a neural network, and in particular, to gathering radar data for training a neural network to perform gesture detection via radar. In one example embodiment, a technique for gathering radar data for training a neural network to perform gesture recognition via radar is provided. The technique first includes identifying radar data collected during a time period between a first prompt and a second prompt. Next, the technique includes identifying a subset of the radar data which is associated with a gesture based at least on Doppler processing. Finally, the technique includes labeling the subset of the radar data as the gesture.

The application discloses a kind of ultra-long baseline distributed radar transceiver local oscillator frequency calibration method and equipment, belong to radar detection technical field.The application includes: selecting the target of relative ultra-long baseline distributed radar stationary, through the echo Doppler processing of stationary target, extracts the local oscillator frequency difference of ultra-long baseline distributed radar, based on the local oscillator frequency difference of ultra-long baseline distributed radar, the compensation of other target echo signal is completed.The application can meet the local oscillator frequency calibration demand of ultra-long baseline distributed detection radar, reduce the influence of distributed radar local oscillator existing frequency difference on system detection performance, reduce the complexity of ultra-long baseline distributed detection system.

The invention discloses an object tracking method based on radar point cloud. A digital signal is subjected to range processing, Doppler processing and angle processing to obtain a first point cloud picture. Identifying whether a first object cluster exists in the first point cloud atlas; recording a first position of the first object cluster in response to the fact that the first object cluster exists in the first point cloud picture; in response to the fact that the first object cluster does not exist in the first point cloud picture, range processing and angle processing are carried out on the digital signal to obtain a second point cloud picture; whether a second object cluster located at the corresponding recorded first position exists in the second point cloud picture or not is recognized; in response to identifying that the second object cluster exists at the first position, a tracking target is identified to be in a static state, and the target can be continuously tracked when the point cloud of the tracking target disappears.

The invention relates to a low-altitude radar, in particular to an all-digital array low-altitude early warning radar, which comprises a digital beam forming module, realizes rapid pointing adjustment of beams and simultaneous formation of multiple beams by digitally controlling the amplitude and phase of each array element in an antenna array, and supports omni-directional scanning of a low-altitude airspace and residence in a key area; the broadband signal processing module is used for generating a high-resolution linear frequency modulation LFM signal, completing pulse compression and Doppler processing of an echo signal, realizing distance-speed joint resolution and meeting a low-speed low-altitude target detection requirement; the self-adaptive interference suppression module is used for dynamically suppressing interference in a low-altitude environment and improving the signal-to-noise ratio of a target; the multi-target tracking and decision-making module is used for realizing multi-target state estimation and trajectory prediction and supporting threat level evaluation and alarm decision-making; according to the technical scheme provided by the invention, the defects that the low-speed low-altitude target is difficult to accurately monitor and the low-altitude safety prevention and control capability is insufficient in the prior art can be effectively overcome.

The invention provides a detection method for radar pull-off interference, and the method comprises the steps: simulating a non-interference radar echo signal, pull-off interference in an ideal environment, and pull-off interference in a small amount of complex environment, and obtaining a distance-Doppler graph through echo format processing and distance Doppler processing; superposing the distance-Doppler maps corresponding to the continuous number of sections by using a sliding window according to setting to obtain a sliding accumulated distance-Doppler map; the non-interference radar echo signal and the sliding accumulated distance-Doppler graph of the pull-off interference in the ideal environment are input into an interference detection model for training, and then the non-interference radar echo signal and the sliding accumulated distance-Doppler graph of the pull-off interference in the complex environment are input into the interference detection model for fine tuning; and completing transfer learning. The detection accuracy of the pull-off interference based on the sliding accumulated distance-Doppler graph is obviously higher than that of the traditional feature.

The invention relates to the technical field of radars, and provides a method and a device for resisting pull-type interference of an airborne radar. The method comprises the following steps: constructing sum channel data, azimuth difference channel data and pitch difference azimuth data of echo signals; constructing sum-difference three-channel data of each pulse according to the sum channel data, the azimuth difference channel data and the pitch difference azimuth data; processing the sum-difference three-channel data by using a blind source separation algorithm to obtain target echo channel data and a separation matrix; performing pulse compression on the target echo channel data to obtain a target distance estimation value; determining an azimuth angle and a pitch angle of the target according to the target echo channel data and the separation matrix; and constructing a target echo matrix by using the target echo channel data of each pulse, and performing Doppler processing on the target echo matrix to obtain a target speed estimation value. The method can resist pull-type interference, determines the distance, azimuth angle, pitch angle and speed of the target, and achieves the effective detection of the target.

A technique for interleaved range and Doppler radar processing is described. The data cube's memory access differs from one view cycle to the next, allowing Doppler processing in the current view cycle to run concurrently with range processing in the next. Range processing in the first view cycle writes rows to the data cube; Doppler processing reads from and clears the columns of the data cube. However, the second view cycle begins before the Doppler processing can complete. Range processing in the second view cycle writes to the columns just cleared by the ongoing Doppler processing, instead of rewriting rows. This allows the Doppler processing of the first view cycle to complete by executing during processing idle times in the second cycle (e.g., between chirps). Through better processor utilization, Doppler processing can have more time to complete its complex operations while maintaining the shortest possible view cycles.

The utility model belongs to the technical field of radar detection, and particularly relates to an anti-interference radar detection device. Comprising a radar transmitter used for transmitting a radar signal; the radar receiver is used for receiving a radar signal reflected from the target object; the signal processing unit is used for performing Doppler processing on the received radar signal; the signal processing unit comprises a false alarm processing module used for reducing false alarms caused by interference; wherein the Doppler processing comprises the steps of decomposing a radar signal into frequency spectrum components and identifying and tracking Doppler frequency shift of a target object, and the signal processing unit identifies and distinguishes motion characteristics of the target object according to the Doppler frequency shift and eliminates or reduces the influence of external interference on a radar system. The anti-interference radar detection device provided by the utility model can improve the performance of a radar, reduce false alarm and missing alarm, and improve the accuracy of target detection and tracking.

A kind of space target component three-dimensional feature extraction method, obtains the radar echo signal of three base stations, obtains ISAR two-dimensional image by range-doppler processing, carries out image registration to ISAR two-dimensional image and converts image to gray scale chart, calculates the best threshold of gray scale chart, converts gray scale chart into binary image, dilates image, hole filling, obtains the boundary of binary image, detects linear line segment on boundary image, obtains the beginning and end coordinates and direction of the line segment, searches the rectangular feature parameters of component in binary image, obtains radar line of sight to imaging plane projection matrix by interference to three ISAR images, searches target component in radar imaging plane projection information, obtains the real size of target component in space in combination with radar imaging plane projection matrix.This application solves the problems of missing scattering point information, target occlusion, etc., and improves the three-dimensional attitude information extraction capability of space target.

The invention provides an FMCW data processing method and system. The method comprises the following steps: performing clutter separation on an FMCW radar original signal to obtain a purified signal; performing time window segmentation on the purified signal, and obtaining a spectrum reconstruction result through multi-resolution spectral domain reconstruction and non-uniform spectrum analysis; target distance information and frequency parameters are extracted from a spectrum reconstruction result, and recursive multi-dimensional Huber joint estimation and spatial domain decoupling processing are carried out to obtain target angle information; doppler processing is carried out on the purified signal to extract target speed information, environment semantic segmentation is carried out by combining distance and angle information of a target, and a target feature vector and an association probability are calculated to generate a target trajectory. According to the method, technologies such as material reflection characteristic compensation, multi-resolution spectral domain analysis, Huber robust estimation and environmental perception are introduced, so that the signal processing precision and the target tracking capability of the 5.8 GHz FMCW radar in an indoor complex environment are improved.

Systems and methods are provided and include a radar system that transmits radar signals within frames having radar chirps. The radar chirps have a stepped frequency waveform such that the initial and end frequencies are changed for subsequent chirps and have a constant pulse repetition period between chirps. The radar system performs range fast Fourier transform (FFT) processing and Doppler FFT processing on receive values corresponding to reflected signals from an object. The radar system estimates range and range-rate information about the object based on range FFT values and Doppler FFT values using a signal model and determines information about the object based on the estimated range and range-rate information. The signal model includes (1) a fast-time dimension term corresponding to samples within a radar chirp and (2) a slow-time dimension term corresponding to individual radar chirps within the frame, with the slow-time dimension term including a second degree term.

The invention relates to a method and apparatus for range-Doppler processing. An apparatus comprising a memory and a processor configured to: obtain a range-Doppler periodic diagram of a received sensing signal, where the range-Doppler periodic diagram represents one or more targets within a Doppler span; estimating distance-Doppler coordinates of the one or more targets outside the Doppler span; and selectively processing a range-Doppler spectrum of the received sensing signal for range-Doppler coordinates within a Doppler interval less than a Doppler span.