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48 results about "Coherent processing interval" patented technology
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A coherent processing interval, in radar systems, indicates a group of multiple pulses, usually with the same PRF and frequency. A CPI will generally consist of one or more coherently integrated pulses, and possibly 1 or more fill pulses. PRF and frequency are sometimes changed between CPIs or groups of CPIs.
Double-threshold constant false alurm motion target detecting method of double base synthetic aperture radar
A detection method of double-threshold constant false alarm movement object on double-base synthetic aperture radar includes finalizing distance compression of various pulse-sampling, dividing orientation time to be multiple CPI, carrying out FFT in each CPI to enter orientation frequency domain, comparing data amplitude of frequency channel at external of clutter region with the first threshold and outputting point trace, making coagulation on point trace, making Hough transform in point trace domain and making decision of the second threshold.
Owner:TSINGHUA UNIV
Radar detection of endo-clutter high-value targets using tracker feedback
ActiveUS20160170019A1Efficient processingRadio wave reradiation/reflectionSpace-time adaptive processingDegrees of freedom
A radar signal target detection and display system employs feedback to produce improved detection and tracking. Portions of the radar images for each antenna channel to search for the target of interest are defined using the track state to define the center of the search region and using the track covariance matrix to define the size of the region. Moving reference processing (MRP) is performed. MRP employs a search centered on the motion state derived from the detection sent to the tracker on the previous coherent processing interval (CPI). Space-time adaptive processing (STAP) is employed on each CPI using a unique set of adaptive degrees of freedom (DOFs) derived from pre-MRP and post-MRP complex radar image amplitudes for each antenna channel.
Owner:BAE SYST INFORMATION & ELECTRONICS SYST INTERGRATION INC
Radar clutter time space adaptive pre-filtering method based on sparse recovery
ActiveCN105738879AImprove effectivenessImprove practicalityWave based measurement systemsDimensionality reductionPhase control
The invention discloses a radar clutter time space adaptive pre-filtering method based on sparse recovery, comprising steps of establishing an airborne phased control array radar clutter model, wherein the airborne phased control array radar receives clutter in a detection area in a coherent processing interval, calculating the clutter on a first distance ring, successively calculating the clutter on the first distance ring and a clutter covariance matrix, setting a matrix obtained through arranging a space time guiding vectors, obtaining the airborne phase control radar clutter rank, successively calculating the space time guiding vector and the sparse recovery clutter amplitude corresponding to the clutter on the basis of the sparse recovery, obtaining the coefficient matrix of the airborne phase control radar clutter canceller, performing pre-filtering on the received clutter, obtaining the clutter vector and the target vector, successively calculating a dimension reduction matrix corresponding to the clutter, a clutter dimension reduction vector and a target dimension reduction vector, and then obtaining the adaptive optional weight when the clutter in the airborne phase control matrix radar detection area performs dimension reduction.
Owner:XIDIAN UNIV
Tangential velocity measurement using interferometric MTI radar
Radar systems use time delay measurements between a transmitted signal and its echo to calculate range to a target. Ranges that change with time cause a Doppler offset in phase and frequency of the echo. Consequently, the closing velocity between target and radar can be measured by measuring the Doppler offset of the echo. The closing velocity is also known as radial velocity, or line-of-sight velocity. Doppler frequency is measured in a pulse-Doppler radar as a linear phase shift over a set of radar pulses during some Coherent Processing Interval (CPI). An Interferometric Moving Target Indicator (MTI) radar can be used to measure the tangential velocity component of a moving target. Multiple baselines, along with the conventional radial velocity measurement, allow estimating the true 3-D velocity of a target.
Owner:NAT TECH & ENG SOLUTIONS OF SANDIA LLC
Phase-coherent accumulation method based on frequency domain shear
InactiveCN104330791AEasy to implementNo speed ambiguity issuesRadio wave reradiation/reflectionFast Fourier transformTarget signal
The invention relates to a phase-coherent accumulation method based on frequency domain shear. When a target echo envelope walks over a range unit within a phase-coherent processing interval, the envelope walking track of a range-slowing-down time dimension signal space is regarded as an image and rotates and translates by a certain angle by a frequency domain shear processing method, each rotary transferring process is subjected to slowing-down time dimension fast Fourier transform to obtain phase-coherent accumulation peak values, so that each rotating angle corresponds to one accumulation peak value, the gradient and the start distance of a corresponding target track are obtained by the aid of the maximum peak value, and the movement track of a target is obtained. Range walking correction and target energy accumulation are effectively realized, and the phase-coherent accumulation method is applicable to radar dim target signal detection and range walking correction in radar imaging technology, high in precision, rapid in operation, easy in engineering realization and fine in robustness.
Owner:SHANGHAI RADIO EQUIP RES INST
Clutter intensity divided self-adaptive dynamic target detection
The invention relates to clutter intensity divided self-adaptive dynamic target detection. An M times echo data of pulse Doppler radar in a coherent processing interval is rearranged, the arranged data is divided into primary and secondary channels, wherein the auxiliary channel adopts an FFT (Fast Fourier Transform Algorithm) to process, and an auxiliary channel clutter map is established as the basis of the selection of the primary channel fir filter bank weight coefficient; the primary channel is realized by adopting the fir filter bank; and the number of the weight coefficients of each filter is 4 which respectively correspond to different ground clutter and weather clutter situations, and one of the four weight coefficients is selected as the fir filter weight coefficient of the primary channel according to the auxiliary channel clutter map. The self-adaptive dynamic target detection provided by the invention has the advantages that the primary and secondary channels are adopted to process, the auxiliary channel is processed by adopting FFT, and the primary channel is realized by adopting the fir filter bank; and the auxiliary channel clutter map is established to indicate the current clutter background of the radar, and the weight coefficient of the primary channel fir filter is selected according to the clutter intensity.
Owner:CNGC INST NO 206 OF CHINA ARMS IND GRP
Radar coherent processing interval scheduling via ad hoc network
ActiveUS8730088B2Small sizeSuperior weight characteristicRadio wave reradiation/reflectionRadarSelf-organizing network
Techniques disclosed herein include systems and methods for accurately scheduling radar and radio events against each other. Specifically, a scheduling manager can schedule radar events based on scheduled radio events (wireless network communication events). A given radio schedule for a compact radar sensor can be a relatively complicated schedule, especially when the compact radar sensor operates as part of an ad hoc network. In certain embodiments, the scheduling manager identifies a radio transmission schedule of neighboring radar nodes or compact radar sensor units. Such a radio transmission schedule of neighboring nodes can include information on when neighboring nodes will be receiving or transmitting data. The scheduling manager then schedules radar events to be executed by the radar device at available times, or at times that do not overlap with scheduled radio events.
Owner:RAYTHEON BBN TECH CORP
Airborne radar real-time Doppler beam sharpening super-resolution imaging method
ActiveCN109613532ASatisfy real-timeQuick estimateRadio wave reradiation/reflectionComputation complexityDoppler beam sharpening
The invention provides an airborne radar real-time Doppler beam sharpening super-resolution imaging method, and belongs to the field of radar detection and imaging. Through a method of scanning-whileobtaining-while processing, Doppler beam sharpening (DBS) super-resolution imaging is realized by fast iterative weighted least squares estimation for echo signals of current adjacent coherent processintervals (CPI), and a next CPI weighted least squares estimation result is recursively updated by utilizing the spatial correlation of adjacent CPI azimuth echoes, so that the convergence speed is improved, and computational complexity is greatly reduced. Compared with a traditional DBS imaging technology, the airborne radar real-time Doppler beam sharpening super-resolution imaging method not only can effectively improve the imaging resolution, but also can reduce the iteration times, the convergence speed is improved, and the imaging resolution is ensured while the real-time capability ofimaging is met.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Method for space-time adaptive processing of airborne radar based on EFA and MWF
ActiveCN105911527AEasy to useSmall amount of calculationWave based measurement systemsFast Fourier transformRadar
The invention discloses a method for space-time adaptive processing of airborne radar based on EFA (Extended Factored Approach) and MWF (Multistage Wiener Filter). The train of thoughts is that the method comprises the following steps: performing spatial domain dimension reduction processing on echoes received by the airborne radar in a coherent processing interval; acquiring included N sub arrays of the airborne radar in a coherent processing interval after spatial domain dimension reduction; recording the echo received by the nth sub array of the airborne radar in a coherent processing interval after spatial domain dimension reduction as Xn; then calculating an echo space-time vector Yk of the kth Doppler channel in the N sub arrays of the airborne radar after weighted fast Fourier transform processing; then performing multistage wiener filtering processing on the echo space-time vector Yk to obtain an echo adaptive weight vector W[Yk] of the kth Doppler channel in the N sub arrays of the airborne radar after D-stage wiener filtering processing; and finally, performing wiener filtering on the echo space-time vector Yk by using the echo adaptive weight vector W[Yk] to obtain an echo adaptive weight vector Zk of the kth Doppler channel in the N sub arrays of the airborne radar after two-stage dimension reduction space-time adaptive processing based on the EFA and the MWF.
Owner:XIDIAN UNIV
Transmitted waveform design method suitable for automotive anti-collision radar, and target detection algorithm
The invention discloses a transmitted waveform design method suitable for an automotive anti-collision radar, and a target detection algorithm. The method comprises the following steps: determining asystem of a radar transmitted signal as a multi-order linear frequency keying system; determining parameters of transmitted waveform according to given indicators, wherein the given indicators comprises radar transmitting frequency band, maximum detection distance, maximum detection speed, distance resolution, ranging accuracy, rate accuracy and frequency domain minimum detectable signal-to-noiseratio, and the parameters required for determining one waveform comprise frequency-modulation bandwidth, coherent processing interval, the amount of the LFSK signal, stepping number of each LFSK signal, and initial frequency difference between the LFSK signals; processing the echo data of the transmitted signal, and solving the target distance and speed. The design method disclosed by the invention is moderate in calculated quantity, the detection precision is improved on the basis that the ranging is unambiguous, and the detection dead zone caused by transmitting-receiving leakage is effectively reduced.
Owner:NANJING UNIV OF SCI & TECH
Random pulse Doppler radar angle-Doppler imaging method based on compressed sensing
ActiveCN106324596AImprove resolutionImprove reusabilityRadio wave reradiation/reflectionRadar systemsAnti jamming
The invention discloses a random pulse Doppler radar angle-Doppler imaging method based on compressed sensing. The method comprises the following steps of 1, obtaining space-time compressed sampling data on the basis of a radar system; 2, performing spatial discretization treatment on Doppler frequency space and spatial frequency in the space-time compressed sampling data, and obtaining a space-time oriented dictionary; 3, on the basis of the space-time oriented dictionary, estimating a space-time power spectrum, and obtaining an angle-Doppler image containing clutter and targets. The method effectively solves the problem of target and clutter Doppler ambiguity, improves the clutter suppression and target detection performance, lowers the number of pulses transmitted by a radar system, and can transmit other radar waveforms or observe multiple angles at the same time at identical pulse coherent processing intervals, thereby effectively improving the radar time dimension complexing ability; on the condition of the identical pulse number, the Doppler resolution capability can be effectively improved; the radar waveform low intercept and capture capacity and the anti-jamming capability are stronger.
Owner:SHENZHEN UNIV
Double-base MIMO radar angle measurement optimization method based on beam space
ActiveCN108828586AFreely adjust the bandwidthSidelobe Level LimitationRadio wave reradiation/reflectionSignal subspaceCoherent processing interval
The invention discloses a double-base MIMO radar angle measurement optimization method based on a beam space. The method comprises the steps of determining a double-base MIMO radar, setting a fact that K targets exist in the detecting range of the double-base MIMO radar, and setting the number of pulses in a coherent processing interval to Q; after determining a fact that each pulse comprises thesignal matrix of the K targets, performing matched filtering, and furthermore performing a matrix signal model; designing by means of a convex optimization method for obtaining a transmitting beam matrix and receiving a beam matrix and optimizing the signal model; determining a signal sub-space, obtaining wave departure angle estimated values and wave arrival angle estimated values of the K targets; determining mapping angle values of I sampling points in an angle area thetae which is interested by a transmitting array and mapping angle values of the I sampling points in an angle area thetar which is interested by a receiving array; further obtaining the wave departure angle true values and the wave arrival angle true values of the K targets, thereby obtaining a double-base MIMO radar angle measurement optimization result based on the beam space.
Owner:XIDIAN UNIV
Radar detection of endo-clutter high-value targets using tracker feedback
A radar signal target detection and display system employs feedback to produce improved detection and tracking. Portions of the radar images for each antenna channel to search for the target of interest are defined using the track state to define the center of the search region and using the track covariance matrix to define the size of the region. Moving reference processing (MRP) is performed. MRP employs a search centered on the motion state derived from the detection sent to the tracker on the previous coherent processing interval (CPI). Space-time adaptive processing (STAP) is employed on each CPI using a unique set of adaptive degrees of freedom (DOFs) derived from pre-MRP and post-MRP complex radar image amplitudes for each antenna channel.
Owner:BAE SYST INFORMATION & ELECTRONICS SYST INTERGRATION INC
Maneuvering target parameter estimating method based on acceleration compensation
ActiveCN109738876AImprove estimation accuracyEasy to implementWave based measurement systemsFast Fourier transformTime condition
The invention discloses a maneuvering target parameter estimating method based on acceleration compensation. The maneuvering target parameter estimating method includes the following steps that (1) acceleration compensation is conducted on data, after clutter suppression, received by an airborne early-warning radar; (2) fast Fourier transform is conducted on signals after acceleration compensationto obtain maximum amplitude values corresponding to fast Fourier transform frequency spectrums, and the maximum amplitude values and the Doppler frequencies corresponding to the maximum amplitude values are recorded; and (3) the maximum amplitude values corresponding to the fast Fourier transform frequency spectrums are compared, the maximum value in the maximum amplitude values is selected, theDoppler frequency corresponding to the maximum value is saved, and thus an initial velocity estimated value and an acceleration estimated value of a maneuvering target are obtained. Under the situation of the number of pulses emitted by the airborne early-warning radar in one coherent processing interval (CPI), compared with a fractional Fourier transform (FRFT) method, the parameter estimation accuracy is improved significantly, the operation speed is high, parameter estimation performance is closer to a CRB boundary, and engineering realization is facilitated. Therefore, the problem of low accuracy of an existing in-air maneuvering target parameter estimating algorithm under the short time condition can be solved.
Owner:四川九洲空管科技有限责任公司
Segmented pulse pressure intermittent sampling and forwarding interference resisting method based on frequency agility radar
PendingCN113759321AReduce the chance of being disturbedImprove interception capabilityWave based measurement systemsICT adaptationBand-pass filterReconstruction algorithm
The invention discloses a segmented pulse pressure intermittent sampling and forwarding interference resisting method based on a frequency agility radar, and the method comprises the steps: continuously transmitting a first preset number of pulse signals in each preset coherent processing interval; generating a plurality of first signals according to the signal corresponding to the linear frequency modulation item, and constructing a plurality of band-pass filters; receiving a first preset number of echo signals, wherein at least part of the echo signals comprise interference information; obtaining a first preset number of baseband echo signal vectors according to the echo signal, and filtering the baseband echo signal vectors by using a band-pass filter to obtain echo sub-pulse signal vectors; according to the first signal and the echo sub-pulse signal vector, obtaining an echo signal vector after segmented pulse compression, and determining an echo matrix after in-pulse accumulation; and performing coherent accumulation on the echo matrix after intra-pulse accumulation by using a two-dimensional sparse reconstruction algorithm to obtain a detection result of the target. The probability that the radar is interfered can be reduced, so that the accuracy of target detection is improved.
Owner:XIDIAN UNIV
Knowledge-assisted broadband radar target detector in non-uniform clutter and design method
PendingCN114609594ASolving Object Detection ProblemsImprove performanceWave based measurement systemsWideband radarAlgorithm
The invention relates to a knowledge-assisted broadband radar target detector in non-uniform clutter and a design method, and the method comprises the steps: dividing a broadband radar target signal into a plurality of sub-bands, and obtaining each sub-band and each pulse signal during a coherent processing interval; the method comprises the following steps: dividing a broadband radar non-uniform clutter signal into a plurality of sub-bands, modeling a clutter covariance matrix into a random matrix, and obtaining clutters of auxiliary data in each sub-band; obtaining a probability density function of clutters of the auxiliary data in each sub-band, and establishing a clutter covariance matrix relation model and a clutter power relation model between the original data and the auxiliary data; establishing a broadband radar target detection problem model according to each pulse signal and the clutter of the auxiliary data; and constructing a knowledge auxiliary detector by using a maximum posterior probability density function. According to the method, a knowledge auxiliary detector for broadband radar target detection in the non-uniform clutter environment is provided, and the problem of broadband radar target detection in the non-uniform clutter environment is solved.
Owner:XIDIAN UNIV
Jamming subspace reconstruction-based radar multi-false target jamming suppression method
ActiveCN104101868AEasy to detectImprove interferenceWave based measurement systemsSpecial data processing applicationsRadar observationsCovariance matrix
The invention belongs to the radar multi-false target jamming suppression technique field and relates to a jamming subspace reconstruction-based radar multi-false target jamming suppression method. The jamming subspace reconstruction-based radar multi-false target jamming suppression method comprises the following steps that: a covariance matrix R<k> of echo signals r <k> is calculated according to the echo signals r<k> which are received by a radar in a k-th coherent processing interval; a jamming subspace P<J><k> of the k-th coherent processing interval is obtained according to Q largest eigenvalues of the R<k>, wherein Q is the number of jammers in a radar observation region; jamming signal suppression is performed on the rk through using the P<J><k>, so that post-jamming suppression signals X<k> of the radar in the k-th coherent processing interval can be obtained; the variable quantity Delta f0j, k> of the Doppler frequency of a j-th jammer in a k+1-th coherent processing interval and the k-th coherent processing interval is estimated; a jamming subspace P<J><k+1> of the k+1-th coherent processing interval can be reconstructed through utilizing the P<J><k> and the Delta f0j, k; and jamming signal suppression is performed on echo signals r <k+1> of the radar in the k+1-th coherent processing interval, so that post-jamming suppression signals X<k+1> of the radar in the k+1-th coherent processing interval can be obtained.
Owner:XIDIAN UNIV
Synthetic aperture radar processing
For synthetic aperture radar (SAR) processing, a SAR receives a plurality of SAR signals. The SAR generates a piecewise approximation of the plurality of SAR signals over a coherent processing interval. The piecewise approximation may mitigate phase reflection components of each SAR signal. The SAR further generates an estimate of the scene from the piecewise approximation.
Owner:UTAH STATE UNIVERSITY
CI interference suppression method based on echo preprocessing and phase-coherent accumulation
ActiveCN112363121AReduce computational complexityNo need to change transmit waveformWave based measurement systemsICT adaptationInterference resistanceRadar
The invention belongs to the field of radar anti-interference, and provides a CI interference suppression method based on echo preprocessing and phase-coherent accumulation in order to solve the problems that self-defense C&I interference is overlapped with a real echo time-frequency domain, and a conventional signal processing means is difficult to suppress effectively. Echo time delay is estimated through a slow time FFT method, a distance window is set to intercept an interfered echo band, and on this basis, interference suppression is achieved by preprocessing echoes, changing fast time position distribution of false targets in different repetition periods and conducting slow time phase-coherent accumulation. According to the method, real echoes and interference signals do not needto be separated by utilizing a signal processing tool, the real target detection probability is greatly improved by integrally processing echoes of a coherent processing interval, and the number of false targets is obviously reduced. The overall calculation amount of the method is not large, and engineering implementation is possible.
Owner:NAVAL AERONAUTICAL UNIV
Two-channel array for moving target indications
ActiveUS20170212217A1Suitable for useRadio wave reradiation/reflectionMoving target indicationCoherent processing interval
A radar antenna system includes a single transmitter for creating pulses from a wideband waveform. A splitter divides each pulse into half-power pulses, and sends them along respective paths. On one path, successive half-power pulses are alternately modulated with a phase shift φA or φF. On the other path, the half-power pulses are not modulated. Each modulated half-power pulse is then combined with an un-modulated half-power pulse to transmit pulses of a full aperture beam with either φA or φF. This establishes two degrees of freedom for the system. Two separate receivers then simultaneously receive the pulse echoes and a signal processor uses the consequent four degrees of freedom to create a radar indicator with mitigated clutter and useable azimuth estimation. A coherent processing interval can then be selected for multi-mode operation of the system.
Owner:INFORMATION SYST LAB
Planning method of pulse time sequence of LPI (Low Probability of Intercept) radar
ActiveCN108572353AImprove securityIncrease the difficulty of detectionWave based measurement systemsRadarPulse sequence
The invention discloses a planning method of a pulse time sequence of an LPI radar. The method mainly comprises that a radar whose detection range includes a target is determined; N pulse signals emitted by the radar within a coherent process interval are determined; according to the total number N of the pulse signals emitted by the radar within the coherent process interval, a time interval vector t of the N pulse signals is set; the radar receives echoes of the N pulse signals after that the N pulse signals emitted in the coherent process interval pass a target, and a vector S of N pulse echo signals and an amplitude-frequency response matching filtering function are obtained successively according to the time interval vector t of the N pulse signals; further a minimum and maximum Doppler sidelobe target function is constructed; and the minimum and maximum Doppler sidelobe target function is solved to obtain an optimized time interval factor t<^> of the N pulse signals. The optimized time interval vector t<^> of the N pulse signals serves as a planning result of the pulse time sequence of the LPI radar.
Owner:XIDIAN UNIV +1
Cascaded multi-dimensional radial motion feature detection method based on pulse correlation
ActiveCN112162256AReduce storageReduce computational complexityICT adaptationRadio wave reradiation/reflectionRadar signal processingAcoustics
The invention relates to a cascaded multi-dimensional radial motion characteristic detection method based on pulse correlation. The method comprises the following steps: additionally arranging a target radial motion characteristic discrimination channel on a radar, and for an echo sample greater than a video detection threshold T, using a pulse correlation method to calculate a radial speed of each distance unit of each pulse in a coherent processing interval; judging continuity of the radial speed in the distance direction, and for the speed through a continuity judgment criterion, extractingeffective speed information and eliminating false speed information by adopting a constant false alarm detection method based on a self-adaptive threshold of background judgment; and generating a radial motion indication signal of each distance unit according to the number and distribution characteristics of effective radial speed pulses of the distance unit in the coherent processing interval, and realizing detection of a radial motion target by the radar. According to the invention, an effective means is provided for the monitoring of a moving target at a radar signal processing level, andproviding data support for the detection, tracking and automatic starting of the target.
Owner:中国船舶集团有限公司第七二四研究所
Adjusting and selecting separation radar waveform generation method and device, equipment and medium
PendingCN114442046ASatisfy Modulation NeedsConsider flexibilityWave based measurement systemsGeneration processTelecommunications
The invention discloses an adjustment separation radar waveform generation method, device and equipment and a medium, and the method comprises the steps: giving a basic waveform library and modulation parameters, and enabling the basic waveform library to comprise a plurality of basic waveform vectors; a coherent processing interval is taken as a period, the number of pulses of a transmitted pulse string signal in one coherent processing interval is expressed as M, generation of each pulse in the pulse string signal is decomposed into two processes of basic waveform selection and pulse modulation, a basic waveform vector corresponding to each pulse is selected from a basic waveform library, and the basic waveform vector corresponding to each pulse is selected from the basic waveform library. And modulating a basic waveform corresponding to the basic waveform vector by using the modulation parameter to obtain a radar pulse signal to be transmitted at present. According to the method, any basic waveform vector can be selected from the basic waveform library in the radar waveform generation process, and the modulation of the basic waveform corresponding to the basic waveform vector is realized by using the modulation parameter. Compared with an existing method, the method has the advantages that the calculation amount and the transmission delay are reduced while any waveform is supported, a new scheme is provided for software radar waveform generation, and the requirements for flexible waveform transformation and waveform modulation are met.
Owner:NAT UNIV OF DEFENSE TECH
Airborne radar space-time adaptive processing method based on efa and mwf
ActiveCN105911527BEasy to useSmall amount of calculationWave based measurement systemsFast Fourier transformDimensionality reduction
Owner:XIDIAN UNIV
Radar object speed tracking method based on cross-product automatic frequency control
The invention provides a radar object speed tracking method based on cross-product automatic frequency control. A cross-product automatic frequency control method is used to measure target Doppler frequency difference, a measured value is sent to a loop filter, the object speed in a next coherent processing interval is predicted, and a speed tracking loop is formed. According to the method, the problem that the tracking precision relies on the resolution of rapid Fourier transform is overcome, the problem of deficiency in a data filtering function is solved, and the method is low in errors and high in precision.
Owner:NANJING UNIV OF SCI & TECH
Two-channel array for moving target indications
ActiveUS10359510B2Suitable for useRadio wave reradiation/reflectionMoving target indicationTransmitter
A radar antenna system includes a single transmitter for creating pulses from a wideband waveform. A splitter divides each pulse into half-power pulses, and sends them along respective paths. On one path, successive half-power pulses are alternately modulated with a phase shift ϕA or ϕF. On the other path, the half-power pulses are not modulated. Each modulated half-power pulse is then combined with an un-modulated half-power pulse to transmit pulses of a full aperture beam with either ϕA or ϕF. This establishes two degrees of freedom for the system. Two separate receivers then simultaneously receive the pulse echoes and a signal processor uses the consequent four degrees of freedom to create a radar indicator with mitigated clutter and useable azimuth estimation. A coherent processing interval can then be selected for multi-mode operation of the system.
Owner:INFORMATION SYST LAB
Radar space-time adaptive processing method and device based on volume correlation function
The embodiment of the invention provides a radar space-time adaptive processing method and device based on a volume correlation function, and the method comprises the steps: obtaining echo data of a radar in a coherent processing interval, and estimating a sampling signal subspace corresponding to a to-be-measured distance unit; based on a volume correlation function of the sampling signal subspace and the target signal subspace, obtaining the distance between the sampling signal subspace and the target signal subspace; based on the distance between the sampling signal subspace and the targetsignal subspace, obtaining detection statistics of the to-be-detected distance unit; and comparing the detection statistics of the to-be-detected distance unit with a preset threshold, and determiningwhether there is a target echo in the to-be-detected distance unit. The radar space-time adaptive processing method based on the volume correlation function provided by the invention can be applied to an airborne radar to obtain a more ideal target detection result in a space-time adaptive processing scene, especially in a non-uniform environment.
Owner:TSINGHUA UNIV
Novel automotive radar using 3D printed luneburg lens
ActiveUS20210278518A1Increase rangeRaise the ratioAdditive manufacturing apparatusDifferential interacting antenna combinationsAntenna radiation patternsWide beam
A high performance, low-cost automotive radar is designed by mounting receivers around a 3D printed Luneburg lens. With this configuration, the antenna radiation pattern is maintained for all angles, (which means no beam deformation). Further, the present radar is capable of performing detection at all azimuth and elevation angles with high angle resolution and broadband operation. The radar adaptively adjusts its spatial sensing pattern, sweeping frequency band, pulse repetition frequency and coherent processing interval according to the environment. This is accomplished by initially performing a rough scan, which updates sensing results via a narrow bandwidth waveform and wide beam scanning. When interested objects are identified, a high-resolution detailed scan is performed in a specific region of interest. In this way, a much more effective detection can be obtained. Moreover, a method of mitigating interference of the 3D printed Luneburg lens based radar and a method of improving the angle resolution using a lens based MIMO approach is disclosed.
Owner:THE ARIZONA BOARD OF REGENTS ON BEHALF OF THE UNIV OF ARIZONA
Perimeter security radar transverse crossing target detection method and system, medium and equipment
PendingCN111796270ASmall sizeImprove signal-to-noise ratioRadio wave reradiation/reflectionArray elementRadar detection
The invention discloses a perimeter security radar transverse crossing target detection method and system, a medium and equipment, which belong to the technical field of radar detection, and are usedfor solving the technical problem that the existing perimeter security radar cannot effectively detect a transverse crossing target. The method comprises the steps of 1) obtaining an angle-Doppler matrix of each array element in a current coherent processing interval; 2) according to the angle-Doppler matrix, calculating a radial speed estimation value and a target angle estimation value of the target; 3) constructing a virtual array according to the radial speed estimation value and the target angle estimation value of the target, and 4) performing target detection on the virtual array. The method has the advantages that the transverse crossing target is effectively and accurately detected, vegetation clutters can be effectively suppressed, and the like.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
A real-time Doppler beam sharpening super-resolution imaging method for airborne radar
ActiveCN109613532BSatisfy real-timeQuick estimateRadio wave reradiation/reflectionSpatial correlationComputation complexity
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
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