77 results about "Matching pursuit" patented technology

The invention discloses an off-network block sparse orthogonal matching pursuit underwater acoustic time delay Doppler domain channel estimation method, and belongs to the technical field of underwater acoustic channel estimation. The method solves the problems that a channel estimation method based on traditional orthogonal matching pursuit cannot estimate frequency shift parameters on non-grid points and is high in calculation complexity. According to the method, channel parameters of integer grid points are obtained based on a BOMP algorithm, and then residual Doppler factors on non-grid points are subjected to further fine estimation based on maximum likelihood criterion fitting. The problem that a traditional OMP channel estimation method in underwater OTFS communication can only estimate channel parameters on grid points is solved, and the estimation precision of channel frequency shift parameters is further improved by estimating frequency shift parameters on non-grid points; and meanwhile, a fractional order dictionary is prevented from being established in a channel parameter process, so that the system complexity is reduced to a certain extent. The method can be applied to underwater sound time delay Doppler domain channel estimation.

The invention relates to the technical field of multi-peak spectrum demodulation, and particularly provides a fiber bragg grating multi-peak spectrum demodulation method and system. The method comprises the following steps: extracting local spectral features based on an experimental reference spectrum to form initial atoms, and performing translation offset and normalization processing to obtain an over-complete spectral atom dictionary; performing global offset preliminary estimation based on the dictionary, and obtaining preliminary estimation values of peak sites of the measurement spectrum and the reference spectrum through cross-correlation calculation; executing constraint orthogonal matching pursuit sparse recovery based on the estimated value, and recovering atomic displacement from the measurement spectrum by using block sparsity, translation consistency and non-negative constraint; and performing wind speed inversion and calibration based on the atomic displacement, and converting the wind speed into a wind speed estimated value through a nonlinear calibration model to obtain a final result. According to the method, a dictionary based on experimental data is constructed, dependence on large-scale labeled data is reduced, a physical mechanism and sparsity prior are fused, and the problems that a traditional method is insufficient in precision and weak in generalization ability in a complex environment are solved.

The invention provides a RIS-assisted location awareness-based communication and sensing integration method, which is used for further improving the calculation efficiency of atomic norms and improving the accuracy of parameter estimation by utilizing priori knowledge between a base station and a reconfigurable intelligent surface. By incorporating priori knowledge into the scheme design, the calculation complexity can be significantly reduced, and the accuracy of channel estimation and positioning can be ensured at the same time. The method has the advantages that super-resolution channel estimation can be achieved, and the performance of the method is superior to that of an existing orthogonal matching pursuit method. The comparison of various performance indexes shows that the method provided by the invention has obvious advantages. The advantage is crucial for realizing accurate positioning service in a complex environment.

The invention discloses a bearing electrostatic signal noise reduction method based on VMD-OMP. In order to solve the problem that early fault features are difficult to extract due to the fact that bearing electrostatic signals are easily affected by power frequency interference and environmental noise, a noise reduction technology based on combination of VMD (variational mode decomposition) and OMP (orthogonal matching pursuit) is provided. The method comprises the following steps of: firstly, performing automatic optimization on a modal number and a secondary penalty factor of VMD decomposition by taking an envelope entropy as a fitness function through a grey wolf optimization algorithm to realize adaptive decomposition; and then, screening effective modal components according to the cross correlation coefficient and the kurtosis, determining the optimal sparseness by adopting a saturation value method, respectively reconstructing the components through an OMP algorithm, and finally, directly adding reconstructed signals to obtain a noise reduction result. According to the method, power frequency noise and broadband interference in the bearing electrostatic signal can be effectively suppressed, and the feature definition and the fault recognition capability of the electrostatic signal are improved.

The invention discloses a ghost imaging target reconstruction method based on FSD-GIRA, and relates to the technical field of digital image processing. According to the technical scheme, a fuzzy clustering algorithm is used for classifying feature values of an optical field intensity measurement matrix of an optical path detector, the feature values are reconstructed through singular value decomposition, dimensionality reduction processing of measurement data of a ghost imaging system is achieved, and the ghost imaging target reconstruction method based on FSD-GIRA is obtained. A WE-FOMP-CG algorithm is proposed, and recovery of sparse signals is optimized by combining generalized orthogonal matching pursuit, a conjugate gradient method and a multi-threshold wavelet noise reduction method; and selecting the most relevant sensing matrix array in each iteration, solving a linear equation set by using PCG, carrying out wavelet preprocessing and multi-threshold de-noising on a result, and updating and recovering estimation. The calculation efficiency and the convergence speed are improved, and a more accurate recovery result is provided in a high-noise environment. The invention also provides a WBDH algorithm, and the algorithm employs a dual denoising mechanism, including wavelet transform and a BM3D method, so as to guarantee that the restored image details and structures are reserved, and further improve the reconstruction quality of the ghost imaging target.

The invention discloses a multi-snapshot Newton orthogonal matching pursuit sound source localization method under related Gaussian noise, and the method employs an autoregression model to estimate the inversion of a noise covariance matrix, carries out the pre-whitening processing of a received signal, and remarkably improves the robustness of a system under the background of related Gaussian noise. Secondly, obtaining initial incident angle estimation by utilizing coarse-grained search, and refining an angle estimation value through Newton iteration so as to improve estimation precision; and further eliminating the optimized angle and the corresponding signal component by using an orthogonal matching pursuit principle, and calculating a residual error. And the iteration stop opportunity is determined according to the self-adaptive termination criterion based on the overestimation probability threshold value, the finally detected angle number is the corresponding actual sound source number, and the limitation that the sound source number needs to be preset or the threshold value is set unreasonably in a traditional method is avoided. According to the method, the multi-source positioning precision under a complex noise background is remarkably improved on the premise of keeping relatively low calculation complexity, and the method has a wide engineering application prospect.

The invention discloses a radar high-speed high-maneuvering target detection method and system based on sparse reconstruction, and belongs to the field of radar signal processing, and the method comprises the steps: building a radar echo model of a high-speed high-maneuvering target; a pulse pressure echo signal is obtained through pulse compression processing; echo odd-order distance and Doppler migration are eliminated by using a motion parameter separation technology; residual distance migration correction is carried out through second-order Keystone transformation; slow time dimension orthogonal matching pursuit (OMP) is adopted to process and compensate residual Doppler migration, so that a sparse reconstruction result of high-speed high-maneuverability target echoes is obtained, and target detection is realized. According to the method, the multi-dimensional search process of the motion parameters of the high-speed high-maneuvering target is avoided, and combined correction of different-order distances and Doppler migration can be realized.

The invention relates to the technical field of SAR (Synthetic Aperture Radar) remote sensing imaging, in particular to a scattering heuristic SAR tomography method for structured three-dimensional reconstruction, which comprises the following steps of: S1, acquiring and preprocessing multi-baseline SAR data; s2, inverting scattering parameters based on an attribute scattering center model and orthogonal matching pursuit; s3, segmenting a building area according to coherence and morphological indication; s4, combining direction perception expansion with region updating, determining a continuous scattering region, and giving reference height prior; and S5, constructing a regional adaptive dictionary, sparsely solving the elevation and geocoding to generate a structured point cloud. According to the method, physical prior and regional statistics are cooperated, geometric continuity and anti-noise robustness are improved, pseudo peaks and calculation redundancy are reduced, and upgrading from sparse point cloud to a structured model is realized.

The invention belongs to the field of radars, and relates to a multi-frequency diversity radar target distance and speed estimation method. According to the method, distance and speed estimation of multi-frequency diversity radar echoes is realized based on a distance and speed dimension super-resolution orthogonal matching pursuit (SRC-OMP) sparse processing algorithm. The high-resolution distance and speed estimation of a multi-frequency diversity radar echo signal is generally realized by combining sparse representation and sparse processing, and a traditional OMP algorithm based on a matched inner product is easy to judge a plurality of targets as one target for estimation when the targets are close to each other due to the characteristics of a sinker function. A distance-velocity two-dimensional spectrum is constructed according to an observation vector and a dictionary matrix, atoms corresponding to peak values in the two-dimensional spectrum are estimated, the positions of the atoms are stored, a set of atomic position indexes and the atoms is updated, and then a residual vector is updated. And then calculating a sparse coefficient solution to obtain a high-resolution target distance and speed detection result. The method is beneficial to high-resolution estimation of the target distance and speed by the multi-frequency diversity radar.

The invention discloses an orthogonal matching pursuit sound field reconstruction method combining weighted transfer matrix modality and improved cosine similarity, and the method comprises the steps: setting a measurement surface, carrying out the uniform division, obtaining a plurality of grid points, installing microphones through the grid points, and forming a holographic surface; a reconstruction surface is arranged, an equivalent source surface is arranged on the side, away from the holographic surface, of the reconstruction surface, and a sound field reconstruction model under sparse sampling based on a transfer matrix mode is established by means of the relation between the source intensity of the equivalent source and the measured sound pressure and the sound pressure of the reconstruction surface; implementing a transfer matrix modal weighting strategy, and solving a weighted sparse coefficient vector of the equivalent source intensity by using an orthogonal matching pursuit method of improved cosine similarity; and realizing sound field reconstruction under sparse sampling according to the weighted sparse coefficient of the equivalent source intensity and the transfer relationship between the reconstructed sound pressure and the equivalent source intensity. According to the invention, the sound field reconstruction precision and stability of the orthogonal matching pursuit method are improved.

The invention relates to the field of rotor blade non-contact state monitoring, in particular to a blade tip timing vibration measurement signal parameter identification method and system under a time-varying rotating speed. Comprising the following steps: constructing a matrix Chirp signal model; performing initial frequency pre-analysis based on a block orthogonal matching pursuit method to obtain an estimated value; defining a range interval of initial frequency analysis and an analysis range of a frequency modulation slope by taking the estimated value as a center, and obtaining an orthogonal matching pursuit result based on a matrix Chirp signal model and a block orthogonal matching pursuit method; and according to a matching tracking result, calculating to obtain a vibration amplitude. According to the method, the frequency modulation slope is introduced to serve as an additional parameter, the change trend of the frequency along with time is reflected, the vibration rule of the blade under the centrifugal stiffening effect can be more truly described, and an accurate physical basis is provided for analysis of non-stationary signals.

The invention relates to the technical field of signal processing, in particular to a joint estimation method and system for time domain parameters of multiple time-frequency overlapped signals, and the method comprises the steps: obtaining a generalized cyclic correlation entropy spectrum of the multiple time-frequency overlapped signals, reconstructing the generalized cyclic correlation entropy spectrum through a compressed sampling matching pursuit algorithm, removing redundant information, and improving the definition and resolution of the spectrum; the speed and precision of spectrum peak searching are improved through an improved grey wolf optimization algorithm, spectrum peak searching is carried out on generalized cyclic correlation entropy spectrum projection, and therefore joint estimation of the carrier frequency and the code element rate is achieved. According to the method, joint estimation and correction of the Cramer-Rao bound in the alpha stable distribution noise environment is deduced, and the method is used for evaluating the effectiveness of the method. When the method is used for reconstructing the entropy spectrum, the influence of impulse noise can be suppressed, so that the reconstructed entropy spectrum is sharper and more gathered; the method has low calculation complexity and higher estimation precision, is suitable for efficient joint estimation of multi-signal time domain parameters, and meets the multi-signal processing requirement in a complex environment.

The invention discloses an ultra-harmonic detection method based on Nuttall window compression sampling and reconstruction estimation, which comprises the following steps of: firstly, on the basis of a 32-equal-time-interval data window detection method, constructing a window sparse measurement matrix at a sampling end by combining a Gaussian random measurement matrix and a four-item 3-order Nuttall window function to perform windowing compression sampling on an ultra-harmonic signal; and then, reconstructing and estimating a sparse vector s (n) by using an orthogonal matching pursuit reconstruction algorithm (OMP) on the data subjected to windowing compressed sampling at a reconstruction end, and finally correcting a peak frequency point of the estimated sparse vector s (n) by using a three-spectral-line interpolation technology to realize accurate detection of each parameter of the ultra-harmonic signal. According to the invention, on the premise of ensuring certain detection precision, the signal data volume required by super-harmonic detection is greatly reduced; and a basis and conditions are provided for analyzing the generation mechanism and propagation characteristics of the ultraharmonics and subsequent treatment.

A method of precoding matrix indicator, PMI, generation for channel state information, CSI, compression in a communication system comprising a first radio transceiver device, RTD, and a second RTD, the method comprising: transmitting, from the second RTD to the first RTD, a reference signal; receiving, at the first RTD from the second RTD, the reference signal; estimating, at the first RTD, CSI based on the received reference signal; generating, at the first RTD, a PMI to perform CSI compression, wherein the PMI indicates a precoding matrix, selected from among a codebook of precoding matrices, based on orthogonal matching pursuit, OMP, processing of the estimated CSI; generating, at the first RTD, a compressed CSI based on the generated PMI for transmission to the second RTD; and transmitting the compressed CSI from the first RTD to the second RTD.

The invention provides a power distribution network node harmonic exceeding main cause identification method, device and system and a medium, and the method comprises the steps: building a node admittance matrix based on the node harmonic voltage and branch current monitoring data of a power distribution network, building a related equation of the harmonic voltage and an injection current, and employing a compressed sampling matching pursuit algorithm to identify the harmonic exceeding main cause of the power distribution network; solving a sparse harmonic injection current vector, and calculating a node harmonic voltage distortion rate according to a harmonic current injection value so as to judge a standard exceeding condition; through a modal analysis method, harmonic current threshold comparison and multi-frequency superposition effect analysis, identifying main factors exceeding the standard, including harmonic injection standard exceeding, multi-frequency superposition and resonance phenomena; and quantizing contribution degrees of resonance and harmonic injection, and distinguishing composite causes of harmonic exceeding. According to the method, the problem that the harmonic cause is unknown in the harmonic exceeding scene is solved, and the accuracy of the harmonic exceeding cause is remarkably improved. Through simulation and actual measurement verification, the accuracy of the method provided by the invention is verified.

The invention provides a phase ranging method based on the combination of orthogonal matching pursuit (OMP) and three-point interpolation refinement. The phase ranging method is suitable for a BLE / SLE narrowband wireless communication system. The method comprises the following steps: firstly, constructing a delay-frequency dictionary, obtaining a multi-channel phase vector through bidirectional phase measurement, and carrying out expansion and normalization processing on the multi-channel phase vector; then, using an OMP algorithm to select an atom which is most matched with the measurement phase in a dynamically generated predefined dictionary, and obtaining rough time delay estimation; then, based on the selected atom and the matching amplitude of the two adjacent points, a three-point parabola interpolation formula is adopted to carry out sub-step size refinement on the time delay, and more accurate time delay estimation is obtained; and finally, converting the refined time delay into a distance value. According to the method, multipath interference is effectively suppressed through sparse modeling, a dictionary step size limit value is broken through through an interpolation step, the distance measurement precision is remarkably improved, and the method has good embedded deployment value.

The application provides an active noise reduction method and system for road noise and wind noise of an automobile, and the active noise reduction method comprises the following steps: S1, collecting a dynamic parameter signal and a total mixed noise signal during automobile driving; S2, constructing a dynamic calculation model of a Strouhal number according to a Reynolds number, deducing a real-time calculation model of a characteristic frequency of each noise source i according to the dynamic calculation model of the Strouhal number, and outputting a real-time characteristic frequency sequence corresponding to each noise source i; S3, constructing a global signal dictionary D, using an orthogonal matching pursuit sparse representation algorithm, and separating a single noise source signal in the total mixed noise signal by iteratively screening a dictionary atom with the highest matching degree with the characteristic frequency; S4, using a frequency tracking type fast adaptive filtering algorithm to generate a corresponding anti-phase cancellation signal; and S5, outputting the anti-phase cancellation signal in the automobile cabin, so that noise reduction can be performed on each noise source i.

The invention relates to an information source number estimation method, in particular to an information source number estimation method based on orthogonal matching pursuit and signal subspace matching. The invention aims to solve the problems that the signal-to-noise ratio of array snapshot data in an underwater acoustic environment is generally not high, the array snapshot data is easily interfered by colored noise and coherent signal sources, and for a high-speed moving target, the number of effective snapshots is small, so that the accuracy of traditional signal source number estimation is low. According to the method, an orthogonal matching pursuit method is utilized to iteratively solve a support vector and a feature vector corresponding to a residual maximum feature value of the support vector to construct two subspaces, and signal source number estimation is realized through a signal subspace matching criterion. Simulation results show that compared with an existing signal source number estimation method, the method has the advantages that the requirement for the signal-to-noise ratio is lower, the performance is better under the condition of small snapshots, and meanwhile the method is not sensitive to coherent signal sources and colored noise. Lake test data processing results show that the method can effectively estimate the number of fixed and moving underwater acoustic targets.

The invention belongs to the technical field of time-frequency spectrum decomposition, and discloses a time-frequency spectrum decomposition method and device based on empirical matching pursuit and a storage medium, the time-frequency spectrum decomposition method comprises the following steps: constructing an empirical mode decomposition (EMD) dictionary suitable for time-frequency analysis according to input seismic data; performing matching pursuit on a seismic signal to be decomposed by using the EMD dictionary to obtain a time-frequency atom combination of the seismic signal; and performing multiple synchronous compression transformation on the time-frequency atoms of the seismic signal to obtain the time-frequency distribution of the seismic signal. According to the method, a new time-frequency characterization method is deduced, a time-frequency spectrum decomposition strategy based on empirical matching pursuit is designed, and the time-frequency resolution of seismic signals is improved by introducing multiple synchronous compression transformation.

The invention belongs to the technical field of data processing and analysis, and particularly relates to a carbonate rock thermal storage acidizing fracturing permeability increase rate inversion method. Comprising the following steps: step 1, installing an optical fiber distributed sound wave monitoring and optical fiber distributed temperature monitoring composite cable at a target well section to collect monitoring data; 2, processing the collected monitoring data, and constructing a unified observation sequence; 3, a combined response template library corresponding to the established well periphery modeling unit is constructed, and orthogonal matching pursuit type strip selection and residual error updating are executed based on the compressed sensing thought by taking the constructed unified observation sequence as a target so as to generate a sparse permeability increasing rate field; and 4, performing numerical checking on the generated sparse permeability increasing rate field, and outputting the corresponding sparse permeability increasing rate field. According to the technical scheme, the calculation efficiency and adaptability are remarkably improved while the result reliability is guaranteed.

The invention belongs to the technical field of underwater acoustic communication, and relates to a matching pursuit decision feedback equalization method, device and equipment and a storage medium, and the method comprises the steps: initializing system parameters; constructing a training data matrix, and reorganizing the receiving signals of the time sequence and the known training symbols into a matrix form; global information required in the iteration process is pre-calculated and stored according to the training data matrix; carrying out rapid matching pursuit iteration solution, gradually selecting an atom, namely an equalizer tap, which is most related to the current residual error from the dictionary in an iteration mode, and updating the coefficient and the residual error until sparseness constraint is met; mapping a solution obtained on the normalized augmented system back to an original physical equalizer coefficient, and initializing the state of the equalizer; and performing continuous equalization and demodulation on unknown data symbols by using the filter coefficient obtained in the training stage, and recursively eliminating inter-symbol interference. And the stability and the overall performance of the underwater acoustic communication receiver under a complex channel condition are remarkably improved.

The invention relates to the technical field of power grid signal matching pursuit, in particular to a power distribution network signal matching pursuit optimization method based on an improved sine and cosine algorithm, and the method comprises the steps: obtaining historical pursuit data for improving the signal matching pursuit efficiency based on a sine and cosine optimization algorithm in a power distribution network; obtaining initial solution distribution improved by an optimization algorithm population initialization method based on segmentation mapping; improving a control parameter updating mode of the sine and cosine optimization algorithm to be improved to obtain a control parameter updating strategy; obtaining a matching pursuit process termination condition constructed based on a noise-containing signal data decomposition result of the power distribution network and a matching degree difference component; the power distribution network signal matching pursuit process is optimized based on the initial solution distribution, the control parameter updating strategy and the matching pursuit process termination condition, the improved sine and cosine algorithm effectively prevents matching pursuit from falling into local optimum, the calculation efficiency is improved, and meanwhile the signal pursuit accuracy is improved.

The present invention discloses a method, device, medium and equipment for estimating a delay-Doppler dual-extension channel under ice-source noise, and relates to the technical field of under-ice channel estimation, so as to solve the technical problem that the performance of estimating a delay-Doppler dual-extension channel is seriously degraded under impulse noise interference. The method comprises: constructing a delay-Doppler dual-extension channel model h, constructing an over-complete dictionary for a received signal y based on a transmitted signal x, reconstructing the over-complete dictionary using Doppler coefficients, and obtaining an over-complete dictionary A in the delay-Doppler domain; determining a received signal y=Ah; using an orthogonal matching pursuit method and using Lp norm correlation as correlation, performing multiple iterations on the equation y=Ah to obtain a sparse approximation value, and determining a delay-Doppler dual-extension channel estimation result h according to the sparse approximation value. The method provided by the present invention can effectively suppress impulse noise interference and realize delay-Doppler dual-extension channel estimation under ice-source noise.

This invention proposes a phase ranging method based on orthogonal matched pursuit (OMP) and three-point interpolation refinement, applicable to BLE / SLE narrowband wireless communication systems. The method first constructs a delay-frequency dictionary, obtains multi-channel phase vectors through bidirectional phase measurement, and then expands and normalizes them. Subsequently, the OMP algorithm selects the atom that best matches the measured phase from a dynamically generated predefined dictionary, obtaining a coarse delay estimate. Then, based on the matching amplitudes of the selected atom and its two adjacent points, a three-point parabolic interpolation formula is used to refine the delay using a sub-step size, obtaining a more accurate delay estimate. Finally, the refined delay is converted into a distance value. This method effectively suppresses multipath interference through sparse modeling and overcomes the dictionary step size limit through the interpolation step, significantly improving ranging accuracy and possessing good embedded deployment value.

This invention discloses a short-time compressed sampling method and system based on a modulation wideband converter (MWT) to solve the problem of real-time acquisition of short-time burst wideband sparse signals. The method reduces the compression and reconstruction unit of the MWT to multiple short-time segments of the uncovered signal's complete time domain. For each segment, a short-time reconstruction algorithm is used for independent reconstruction. This algorithm integrates principal component analysis for dimensionality reduction, a modified atom matching strategy for selecting conjugate atom pairs, recursive prospect orthogonal matching pursuit for determining the support set, and time-domain support extraction to suppress noise. Finally, the complete signal is recovered through segment reconstruction. This invention significantly reduces reconstruction complexity, improving the signal-to-noise ratio of reconstructed 5GHz wideband signals at a 2.5GHz sampling rate by more than 4dB compared to traditional methods, and exhibits stronger robustness to changes in sparsity and channel number, achieving low-power, high-precision sub-Nyquist sampling.

This invention discloses a sonar signal bandwidth extension method and system based on an adaptive sparse reconstruction approach. It acquires frequency domain data of active sonar echoes through matched filtering and extracts the transmission bandwidth range of the active sonar. A physical perception dictionary containing the physical ripple characteristics of the transmitted waveform is constructed to establish a precise mapping from the sparse target space to the observation frequency band. An adaptive threshold detection mechanism is introduced during the orthogonal matched pursuit iteration process to screen potential targets using the statistical characteristics of local background noise. A meshless global optimization algorithm is used to jointly fine-tune the target position in the continuous time domain. A full-band skeleton spectrum is constructed using precise parameters, and the noise residuals in the original frequency band are back-injected and inversely transformed to obtain a high-resolution time-domain waveform. This invention significantly improves the ability to distinguish closely spaced targets and the detection performance of weak targets in complex underwater acoustic environments.

The invention provides a vehicle-mounted navigation system fault monitoring method, which comprises the following steps of: 1, receiving a signal by using a GNSS receiver and an IMU device in a vehicle-mounted navigation system, positioning by adopting a Kalman filtering method, and obtaining measurement domain information at the same time; step 2, constructing state domain information and a covariance matrix thereof according to the Kalman filtering parameters and the measurement domain information; step 3, separating and judging GNSS faults from the state domain information and the covariance matrix thereof by using a projection operator; step 4, positioning the judged GNSS fault by adopting an orthogonal matching pursuit method and removing the fault, if all satellites are removed, warning that the GNSS is unavailable, otherwise, executing step 5; step 5, according to the state domain information and the covariance matrix of the state domain information after the GNSS fault is eliminated, separating and judging an IMU fault by using a projection operator; and step 6, correcting the IMU fault, and completing fault monitoring of the vehicle-mounted navigation system.

The application belongs to the technical field of wireless positioning and specifically relates to a reconfigurable intelligent surface assisted SISO system user near field positioning method. Regular multivariate decomposition and orthogonal matching pursuit are combined to obtain initial values of TOA and AOD on the RIS, then, a l1-norm regularization method based on sparsity is used to estimate the distance. Then, the maximum likelihood estimation formula is used to refine the initial estimation. Finally, the extended invariance principle is combined with the least square method to recover the position and clock offset. The obtained parameter estimation performance is close to the Cramer-Rao lower bound of the estimation error.

The present application belongs to the field of array signal processing, and relates to a switched antenna array DOA estimation method based on orthogonal matching pursuit joint tracking. In view of the problem of algorithm performance distribution imbalance in traditional switched antenna array DOA estimation, a switched antenna array DOA estimation method based on orthogonal matching pursuit joint tracking is provided. The present application takes a sparse reconstruction algorithm as a starting point, converts the DOA estimation problem into a sparse representation problem of a dynamic dictionary by constructing a spatially over-complete dictionary, utilizes the characteristic that the sparse solutions of various observation values correspond to the same support set, and jointly solves all sampling data by using an orthogonal matching pursuit joint tracking algorithm, so that the structural characteristics of the switched antenna array are fully utilized, the DOA estimation precision is improved, and high-precision and low-complexity switched antenna array DOA estimation is realized.

The application relates to the technical field of relays, and discloses a relay contact action time analysis method based on target matching tracking, which is used for improving the accuracy when analyzing the relay contact action time. The method comprises the following steps: performing power-on testing on a target relay, collecting contact images of the target relay in the power-on testing process, and obtaining a contact image set; pre-processing the contact image set to obtain a processed image set; performing feature recognition on each processed image in the processed image set to obtain contact position information in each processed image in the processed image set; and performing contact action time analysis on the target relay based on the contact position information in each processed image in the processed image set to determine a target contact action time.