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In antenna engineering, side lobes or sidelobes are the lobes (local maxima) of the far field radiation pattern of an antenna or other radiation source, that are not the main lobe. The radiation pattern of most antennas shows a pattern of "lobes" at various angles, directions where the radiated signal strength reaches a maximum, separated by "nulls", angles at which the radiated signal strength falls to zero. This can be viewed as the diffraction pattern of the antenna. In a directional antenna in which the objective is to emit the radio waves in one direction, the lobe in that direction is designed to have a larger field strength than the others; this is the "main lobe". The other lobes are called "side lobes", and usually represent unwanted radiation in undesired directions. The side lobe directly behind the main lobe is called the back lobe. The longer the antenna relative to the radio wavelength, the more lobes its radiation pattern has. In transmitting antennas, excessive side lobe radiation wastes energy and may cause interference to other equipment. Another disadvantage is that confidential information may be picked up by unintended receivers. In receiving antennas, side lobes may pick up interfering signals, and increase the noise level in the receiver.
Waveform optimization method and system for underwater acoustic detection and communication integrated system
The invention relates to the field of underwater acoustic communication and detection, in particular to a waveform optimization method and system for an underwater acoustic detection and communication integrated system. According to the method, a constant modulus phase is taken as a constraint, a reserved subcarrier phase is taken as an optimization variable, and a multi-objective function for joint optimization of a peak-to-average power ratio and a non-periodic autocorrelation integral sidelobe ratio is constructed; a population is initialized, an objective function is evaluated, and a parent population is obtained through non-dominated sorting and crowding distance calculation; generating filial generations through selection, crossover and variation, combining the filial generations with the parent generations, and updating sorting and crowding distance to maintain population diversity; introducing a local gradient descent refinement mechanism, carrying out gradient iteration adjustment on an optimized individual under a constant modulus phase condition, and adaptively adjusting a crossover probability, a mutation probability and a phase variation scale according to a diversity evaluation result; and outputting a Pareto optimal solution set after the maximum number of iterations is reached, and obtaining an optimized sounding and communication integrated orthogonal frequency division multiplexing signal, so that the underwater communication and detection comprehensive performance can be effectively improved.
Owner:INST OF ACOUSTICS CHINESE ACAD OF SCI
Audio data processing method and device and electronic equipment
The invention discloses an audio data processing method and device and electronic equipment, and relates to the field of audio processing. The method comprises the following steps: acquiring original multichannel audio data through a microphone array; generating a main beam output signal pointing to the target sound source direction and at least one sidelobe suppression output signal; extracting voiceprint feature vectors; comparing the voiceprint feature vector of the current frame with the center vector of the existing voiceprint class cluster to obtain a voiceprint clustering result; if it is determined that the first voiceprint class cluster and the second voiceprint class cluster exist, extracting a first audio frame belonging to the first voiceprint class cluster and a second audio frame belonging to the second voiceprint class cluster, and performing audio reconstruction to obtain a first voice stream and a second voice stream; and carrying out residual noise elimination on the sidelobe suppression output signal to obtain a first isolated audio stream and a second isolated audio stream. By implementing the technical scheme provided by the invention, the audio processing quality is improved.
Owner:SHENZHEN SOUNDFIT TECH CO LTD
Passive antenna array beam forming test method and system
The invention provides a passive antenna array beam forming test method and system, and relates to the technical field of beam forming test. According to the method, channel baseline parameters are established in a silencing environment, frequency hopping and channel switching are combined to realize multi-frequency-point synchronous sampling, a reference source and self-polling data are utilized to calculate a mutual coupling correction matrix and a feeder line consistency factor, and weight projection and equivalent aperture field generation are completed without changing physical wiring conditions; further extracting a main lobe direction, a beam width, a side lobe level and a scanning consistency index through far field transformation, and unwrapping and smoothing a frequency-point-crossing phase result; and meanwhile, generating a unique traceability identifier, establishing full-link association between a test condition and a result, and outputting a criterion conclusion. According to the method, the accuracy, efficiency and traceability of passive array beam testing are improved.
Owner:ZUNYI NORMAL COLLEGE
Time domain broadband adaptive beam forming method and system based on Chebyshev weighting
The invention relates to a time domain broadband adaptive beam forming method and system based on Chebyshev weighting, and belongs to the field of array signal processing. Aiming at the technical problems of poor real-time performance and high sidelobe of the existing broadband beam forming, the method comprises the following steps of: dividing a received broadband signal into a plurality of sub-bands, obtaining an optimal weight vector for each sub-band by adopting a minimum linear constraint iterative algorithm after down-conversion, constructing an expected response of an FIR filter according to each weight, obtaining a filter coefficient through L2 norm convex optimization, and finally obtaining a high sidelobe beam according to the expected response of the FIR filter. And performing time domain weighting on each array element signal by using a filter bank, and outputting a directional beam. According to the method, the calculated amount is low, a main lobe and interference null can be formed in real time in a broadband, and a certain side lobe height is kept.
Owner:SOUTHEAST UNIV +1
Ultra-wideband array antenna based on common-caliber layout
The invention relates to the technical field of array antennas, and discloses a common-caliber layout-based ultra-wideband array antenna, which comprises a low-frequency unit and a high-frequency unit which are arranged based on a common caliber, and is characterized in that the working frequency of the low-frequency unit covers an fmin-f0 frequency band, and the working frequency of the high-frequency unit covers an f0-fmax frequency band. The low-frequency unit is a broadband dual-polarized antenna, a uniform tight coupling array distributed at equal intervals is formed by adopting a tight coupling principle, and the unit interval is calculated based on a grating lobe suppression condition at the frequency f0. The high-frequency unit is a miniaturized broadband dual-polarized antenna and adopts a sparse array form; the initial unit spacing and the unit number of the sparse array are calculated based on the grating lobe suppression condition at the highest frequency f2 of the f1-f2 frequency band with the side lobe requirement between the f0-fmax frequency bands. The ultra-wideband array antenna gives consideration to full-band array performance, can provide sufficient space for active circuit arrangement, and effectively reduces power consumption and cost.
Owner:10TH RES INST OF CETC
Vector hydrophone array orientation estimation method for tensor decomposition by using propagation operator
PendingCN121679471ADirection finders using ultrasonic/sonic/infrasonic wavesComplex mathematical operationsSound sourcesTensor decomposition
The invention discloses a vector hydrophone array orientation estimation method for performing tensor decomposition by using a propagation operator, relates to the technical field of vector hydrophone array orientation estimation, and discloses a vector hydrophone array orientation estimation method for performing tensor decomposition by using a propagation operator. The method comprises the following steps: firstly, constructing a three-dimensional array manifold tensor composed of an array direction matrix and a vector hydrophone output matrix; respectively expanding received signal tensors according to three modes, solving a propagation operator based on a column block covariance matrix, constructing a normalized signal subspace, establishing a spatial spectrum function with a noise subspace, and obtaining a pitch angle and an azimuth angle of a sound source through spectrum peak search; according to the method, high-order singular value decomposition is avoided, the operand is greatly reduced, meanwhile, high resolution and low sidelobe direction finding performance are kept, and the method is suitable for a real-time underwater acoustic direction finding system of a ship-borne platform, a buoy platform and an unmanned platform.
Owner:YANTAI HAIXIN TUOFEI MARINE TECH CO LTD +1
Active sonar echo signal phase jump compensation method based on synchronous serial number
The invention relates to an active sonar echo signal phase jump compensation method and device based on a synchronous serial number, and belongs to the technical field of underwater acoustic signal processing. The method comprises the following steps: adding a synchronous serial number into a wet end signal to form an expansion matrix; transmitting the extended signal to a signal processor and windowing the extended signal; traversing a synchronous serial number in the windowing signal, and detecting the continuity of the synchronous serial number to judge whether packet loss exists or not; if packet loss exists, positioning a packet loss position and performing zero padding operation; and finally, carrying out fast Fourier transform on the zero-filled signal to obtain a spectral analysis result. According to the method, accurate identification and phase compensation of the packet loss position are achieved through the synchronous serial number, the method is suitable for underwater acoustic single-frequency signals, and when the packet loss rate does not exceed 2.5%, spectrum sidelobes can be effectively restrained, and the peak value of the spectrum sidelobes is reduced to be within 10% of the packet loss state. The method has the advantages of being clear in principle, easy and convenient to operate and high in calculation efficiency, is suitable for real-time signal processing, and remarkably improves the reliability and efficiency of target detection.
Owner:THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP +1
Ground clutter suppression method for ground reconnaissance radar
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.
Owner:WEIHAI WEIGAO ELECTRONICS ENG
Special high-throughput satellite communication terminal for electric power
PendingCN121547092ARadio transmissionHigh level techniquesSatellite radioInterference (communication)
The invention provides a special high-throughput satellite communication terminal for electric power, and relates to the technical field of electric power communication, and the special high-throughput satellite communication terminal comprises a baseband processing module which is used for carrying out differential encryption processing on different types of electric power data; the high-throughput satellite radio frequency module is used for suppressing sidelobe interference while realizing automatic satellite beam tracking through a beam forming algorithm during satellite communication, and calculating the optimal transmitting power through a self-adaptive power regulation algorithm; the communication transmission module is used for presetting a data priority based on a priority mapping table during data transmission and preempting satellite beam resources according to the data priority; the electric power Internet of Things protocol adaptation layer is used for realizing conversion between an electric power dedicated protocol and a satellite IP protocol, differential coding compression of electric power data and interrupted transmission in a link; and the beam optimization module is used for dynamically optimizing the beam pointing angle based on the satellite orbit parameters and the terminal geographic position. According to the scheme, the coverage degree of electric power communication in remote areas can be improved, and the safety and reliability of data transmission are improved.
Owner:国网宁夏电力有限公司固原供电公司
Method for maximizing main lobe gain of analog-digital hybrid array for radar communication system
ActiveCN121441359ASpatial transmit diversityWave based measurement systemsCommunications systemHybrid array
The invention discloses a main lobe gain maximization method for an analog-digital hybrid array of a radar communication system. According to the method, the ratio of the maximum minimum main lobe level to the peak side lobe level is used as a target function, and under the main lobe ripple constraint, the simulation weight constant modulus constraint and the digital weight power constraint, the ADMM (Alternating Direction of Multiplexing) is used for carrying out joint design on the simulation weight and the digital weight. In the ADMM framework, a Riemann conjugate gradient method is adopted to solve a simulation weight subproblem with constant modulus constraint; and solving a digital weight by adopting a Lagrange multiplier method. A numerical result shows that the method can generate better main lobe ripples and lower peak side lobe level, and has good beam directional diagram accurate control performance.
Owner:NANJING UNIV OF SCI & TECH
SAR interference suppression method based on echo asynchronous pulse detection
The invention discloses an SAR interference suppression method based on echo asynchronous pulse detection, and the method comprises the steps: constructing a local odd-even channel comparison mode or a global reference pulse comparison mode, directly carrying out the processing in a time domain of an SAR echo data matrix, determining a corresponding mode through the energy characteristics of an interference signal, and carrying out the detection of the interference signal. Constructing a channel difference mask and an outlier mask in the corresponding mode, and finally obtaining an interference mask in each mode; establishing a mask matrix based on the interference mask, and processing the amplitude matrix to obtain an amplitude matrix after interference suppression processing; and combining the phase matrix to obtain a final non-interference SAR echo data matrix. According to the method, interference artifacts brought to SAR image data by the forwarding type coherent interference can be suppressed, and the phenomenon of sidelobe deterioration of strong scattering points in the image after frequency domain notch is eliminated, so that the forwarding type coherent interference existing in the SAR echo data is effectively suppressed.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Dual-polarization one-dimensional scanning phased-array antenna and weather radar system
The invention discloses a dual-polarization one-dimensional scanning phased-array antenna and a weather radar system, the antenna comprises a radiation layer, a first feed layer, a first PCB layer, a second feed layer, a second PCB layer and a third feed layer which are stacked from top to bottom, and a horizontal polarization radiation unit and a vertical polarization radiation unit of the radiation layer are arranged in an orthogonally staggered manner; each first feeder is etched on the top surface of the first PCB layer and corresponds to a first metal groove formed in the bottom of the first feed layer and a second metal groove formed in the top of the second feed layer in position; and each second feed line etched on the top surface of the second PCB layer corresponds to the position of a third metal groove formed in the bottom of the second feed layer and the position of a fourth metal groove formed in the top of the third feed layer. According to the invention, high cross polarization isolation is realized, and the antenna has dual polarization beams with low side lobes and consistent beam width and pointing height in the whole working frequency band.
Owner:HUNAN NOVASKY ELECTRONICS TECH CO LTD
High Gain Multiple Input, Multiple Output Antenna
PendingUS20260121297A1Simultaneous aerial operationsRadiating elements structural formsSoftware engineeringSide lobe
A high gain multiple input, multiple output antenna which has a feeding board; a ground plane; a low band patch radiator; a first printed circuit board; a second printed circuit board; and a high band dipole patch radiator. The high band dipole patch radiator is a co-located stacked array on top of the low band patch radiator. The high band dipole patch radiator and the low band patch radiator are proximity coupled with the first printed circuit board and the second printed circuit board. The low band patch radiator covers low band frequencies in the range of 2.4 GHz to 2.5 GHZ and the high band dipole patch radiator cover high band frequencies in the range of 4.9 GHZ to 7.125 GHz. The antenna assembly has a gain of above 7.5 dBi and a well-directed radiation patten with no side lobes.
Owner:TE CONNECTIVITY SOLUTIONS GMBH
Design method and system based on radar antenna
ActiveCN121659666ADesign optimisation/simulationSpecial data processing applicationsRadar antennasPhase correction
The invention relates to the technical field of simulation design, in particular to a design method and system based on a radar antenna, and the method comprises the following steps: resolving a phase error based on thermal deformation, analyzing a dynamic sidelobe variance in combination with displacement spectrum integration and covariance mapping, and generating a waveguide skeleton through electromagnetic energy mapping fluid damping; according to the method, thermally induced phase error data is introduced, the influence of structural deformation on the phase is accurately calculated, and meanwhile, calculation of dynamic group delay and group delay difference is combined, so that the phase correction accuracy is improved. Prediction of influence of structural deformation on electrical performance, data fusion of multiple physical fields and automatic process optimization are realized, design precision and efficiency are improved, limitation of single simulation software is avoided, factors such as material loss and gain evolution are accurately corrected in the design process, performance requirements of the high-frequency radar are met, and complex environment adaptability is improved.
Owner:成都玖锦科技有限公司
Ground target elimination method for two-dimensional phased array low-altitude detection, medium and electronic equipment
The invention belongs to the technical field of radar data processing, and relates to a ground target elimination method for two-dimensional phased array low-altitude detection, a medium and electronic equipment. The method comprises the following steps: transmitting a single-frame waveform composed of an airspace detection wave position and a ground sidelobe rejection wave position; selecting the detection point with the maximum power as an effective detection point of the airspace detection wave position, and judging the other detection points as ground side lobe detection points and removing the ground side lobe detection points; and rejecting effective detection points with ground sidelobe rejecting wave positions of which the power is higher than that of the effective detection points from the detection points of the airspace detection wave positions. According to the method, the unmanned aerial vehicle batch starting time is greatly shortened, and unmanned aerial vehicle track batch starting is realized; the contradiction between the detection power and the batch starting time is decoupled, and the ground side lobe target is eliminated; the beam resource utilization rate is improved, and the detection response speed of the radar system to the unmanned aerial vehicle target is improved.
Owner:成都纳雷科技有限公司
Hybrid clutter suppression using electronically scanned antennas
A system and method for distinguishing targets of interest from main lobe clutter and sidelobe clutter includes an ESA or AESA divided into subarrays. A sum beam power profile is produced via one or more scans of the subarrays, and a difference beam power profile is produced via calculations involving the subarrays. A comparison of the sum beam power profile and the difference beam power profile accentuates signal power disparities between targets of interest and clutter. A threshold is then applied to isolate targets of interest. Different difference beam power profiles may be used for elevation comparisons and azimuth comparisons. Alternatively, subarrays may be selected such that the same difference beam power profile may be used for both elevation and azimuth. Scans may be time multiplexed such that data from different scans may be used to produce the sum beam power profile, the difference beam power profile, or both.
Owner:ROCKWELL COLLINS INC
SAR anti-interference method based on multiple orthogonal frequency modulation waveform design
PendingCN121918072ARadio wave reradiation/reflectionGenetic algorithmsAnti jammingFrequency spectrum
According to the SAR anti-interference method based on the multiple orthogonal frequency modulation waveform design disclosed by the invention, the waveform agility number and orthogonality can be improved while the low sidelobe imaging performance is ensured; in addition, according to the method, a segmented high-degree-of-freedom frequency modulation coding structure is adopted, and the long-distance imaging requirement of a satellite-borne SAR system under the condition of a large time bandwidth product can be met. The method comprises the following steps: S1, constructing a multi-target signal optimization model for minimizing a peak sidelobe ratio and cross-correlation peak energy; s2, designing an improved adaptive genetic algorithm for solving a non-convex complex waveform optimization problem; s3, an MOFM waveform with accurate spectrum control capability is obtained through algorithm optimization; s4, effective suppression of main lobe active interference is realized by using the designed waveform; compared with a traditional linear frequency modulation waveform, the method has the advantages that the low sidelobe characteristic is kept, meanwhile, the orthogonal agility number is remarkably increased, and the method is suitable for the anti-interference imaging requirement of a modern spaceborne SAR system.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +1
Unified beam control mode back projection SAR imaging post-processing method
The invention discloses a unified beam control mode back projection SAR imaging post-processing method, and relates to the technical field of radar signal processing, and the method comprises the steps: carrying out the range pulse compression and side lobe suppression of original echo data; then establishing a minimum error imaging grid and performing coordinate system conversion; constructing a uniform spectrum compression function, and designing an azimuth time domain windowing function according to the relative position of the beam pointing and the grid point; integrating a unified frequency spectrum compression function and an azimuth time domain windowing function in a back projection imaging process to realize focusing reconstruction of a preprocessed signal; and finally, a high-quality post-processing image is obtained through phase error compensation. The method effectively improves the imaging precision and efficiency, and is suitable for various beam control modes.
Owner:XIDIAN UNIV
IGSA-based microphone array layout optimization method
The invention discloses a microphone array layout optimization method based on IGSA, and belongs to the field of sound source localization. The method comprises the following steps: firstly, constructing a topological structure of a microphone array as a rectangular array; then, the directivity and the directional diagram of the microphone array are adopted to express the performance of the microphone array; constructing a fitness function through the width of a main lobe, the level of a side lobe and the number of microphones; then, on the basis of a genetic algorithm, improving crossover and mutation steps, adopting a hierarchical crossover strategy and a similarity regulation and control mutation strategy, and simultaneously optimizing an array structure by a simulated annealing operator in an interspersed manner; and finally, outputting the optimal microphone array arrangement to meet the requirements of low sidelobe performance and high resolution. The IGSA algorithm is adopted to optimize the microphone array layout, so that more accurate global optimization, faster convergence speed and better multi-target balance are realized, and particularly, the number of microphones and the hardware cost are remarkably reduced while the sound source localization performance is ensured.
Owner:CHANGCHUN UNIV OF SCI & TECH
Self-decoupling method for multi-characteristic spectrum inversion and ribbon-parallel fiber bragg grating sensing optical cable
PendingCN121089608AThermometers using physical/chemical changesUsing optical meansSide lobeFiber gratings
The invention provides a self-decoupling method for multi-characteristic spectrum inversion and a ribbon-parallel fiber grating sensing optical cable, and relates to the technical field of optical fiber sensing, and it needs to be explained that a grating reflection spectrum of the ribbon-parallel fiber grating sensing optical cable is obtained by determining a reference quantity according to the embodiment of each method; the method comprises the following steps: placing a ribbon-parallel fiber bragg grating sensing optical cable in a preset characteristic calibration state, collecting a reflection spectrum of the ribbon-parallel fiber bragg grating sensing optical cable, and traversing the reflection spectrum through a main peak global extremum search algorithm to obtain a central wavelength of the ribbon-parallel fiber bragg grating sensing optical cable; extracting a first-order left side lobe intensity and a first-order right side lobe intensity in symmetrical wavelength windows at two sides of the central wavelength by adopting a peak detection algorithm, and respectively calculating a wavelength reference variation, a left side lobe reference variation and a right side lobe reference variation according to the calibration reference quantity; and constructing a response characteristic calibration model so as to respectively solve the temperature variation and the strain variation of the ribbon fiber grating sensing optical cable. According to the invention, the decoupling precision and stability can be improved.
Owner:WUHAN UNIV OF TECH
Adaptive beam prediction and control method for satellite mobile communication antenna
The invention relates to a satellite mobile communication antenna adaptive beam prediction and control method, which comprises the following steps: acquiring motion data of a user terminal, signal state data of a satellite antenna receiving end, satellite-ground attitude data of a satellite and environment interference data of the ground, and processing to obtain a multi-source data set; the method comprises the following steps: constructing a geometric correlation feature, a gain correlation feature, a sidelobe correlation feature and an array element phase correlation feature of a multi-source data set and beam parameters, constructing a correlation matrix, and splicing the correlation matrix with the multi-source data set to obtain a complete input feature set; a beam prediction model is constructed, and training and verification are carried out; and converting the output of the beam prediction model into a control signal to drive an antenna array element to adjust, correcting model parameters based on the link signal-to-noise ratio, the bit error rate and the throughput collected by the user terminal, and splitting / combining the beam. According to the method, the beam parameter prediction precision and environment adaptability can be improved, interference is suppressed, resource allocation is optimized, and stability and high efficiency of satellite communication in a high-dynamic complex environment are guaranteed.
Owner:YANGO UNIV
Structural parameter and sweep frequency signal determination method of controllable impact source
The invention relates to the technical field of seismic exploration, in particular to a method for determining structural parameters and sweep frequency signals of a controllable impact seismic source, which is used for carrying out an indoor physical test of a controllable impact seismic source model machine and ensuring the effectiveness of a design scheme of the controllable impact seismic source. Constructing and verifying a multi-body dynamics numerical model of single impact, performing single variable sensitivity analysis on key structure parameters, and determining an optimal structure parameter combination by taking a frequency domain of output seismic waves as an evaluation index; constructing a multi-impact model, performing a simulation test on the sweep frequency control parameter, and determining an optimal sweep frequency signal parameter based on the main lobe amplitude and the main lobe-side lobe amplitude ratio of the output signal autocorrelation function; through forward modeling and cross-correlation-scattered wave inversion imaging processing, an application method of a controllable impact seismic source is established, and validity is verified. The technical problems that a traditional trial and error method is low in efficiency, main lobe energy of seismic source output signals is dispersed due to an unknown parameter influence mechanism, side lobe interference is large, and the signal-to-noise ratio is low are solved.
Owner:CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
Steam pipeline leakage detection method based on fusion of acoustic array and temperature measurement camera
The invention proposes a novel steam pipeline leakage detection method based on the fusion of an acoustic array and a temperature measurement camera, and the method comprises the following steps: synchronously collecting an acoustic signal, a temperature image and a visible light image, carrying out the preprocessing and wave beam forming of the acoustic signal, obtaining an acoustic energy diagram, carrying out the thermal anomaly detection of the temperature image, and obtaining a detection result. Geometric registration is carried out on the acoustic energy diagram and the temperature image; beam forming is restrained by using the thermal anomaly mask; a sidelobe-restrained acoustic energy diagram is generated; multi-source evidence fusion is carried out on the sidelobe-restrained acoustic energy diagram and the thermal anomaly mask to obtain a leakage probability diagram; and finally, displaying a superposition result and receiving user interaction. According to the invention, through fusion of multiple devices such as the acoustic array and the temperature measurement camera, accurate detection and stable tracking of steam pipeline leakage are realized, and the method has important application prospects and technical significance.
Owner:国能神福(石狮)发电有限公司
Synthetic aperture radar image reconstruction method and device based on Gaussian kernel
The invention relates to a synthetic aperture radar image reconstruction method and device based on a Gaussian kernel, and the method comprises the steps: constructing a Gaussian kernel set of a synthetic aperture radar based on an initial image of the synthetic aperture radar, and generating a two-dimensional Gaussian kernel representation model of the initial image; establishing a physical imaging model represented by a full-scene Gaussian kernel according to a mapping relation from the Gaussian kernel to a distance compression domain of the synthetic aperture radar, and further establishing a loss function; and performing parameter iterative optimization on the Gaussian kernel according to the loss function, and further updating the two-dimensional Gaussian kernel representation model by taking the optimized Gaussian kernel as an initial value so as to generate a final synthetic aperture radar image by using the updated two-dimensional Gaussian kernel representation model. Therefore, the problems that as the SAR imaging method mostly adopts a linear processing mode, side lobe enhancement, noise diffusion and detail blurring are easily caused under the conditions of complex terrains, non-ideal tracks or sparse sampling, so that the imaging precision and the visual definition are reduced and the like are solved.
Owner:TSINGHUA UNIVERSITY
Cable extrusion process state online monitoring method and system based on acoustic sensing
ActiveCN121200387ASubsonic/sonic/ultrasonic wave measurementSpeech analysisFast Fourier transformFrequency spectrum
The invention belongs to the technical field of extrusion process monitoring, and particularly relates to a cable extrusion process state online monitoring method and system based on acoustic sensing, so as to solve the technical problem of inaccurate cable extrusion process state monitoring in the prior art. The monitoring method comprises the following steps: S1, when a transient impact factor is greater than a preset threshold value, windowing a signal frame by adopting an asymmetric window function with a main lobe in front and a side lobe in back; s2, performing fast Fourier transform on each windowed signal frame to obtain a frequency spectrum of each windowed signal frame; filtering the frequency spectrum of each signal frame by using a filter bank and calculating logarithmic energy of each filtering channel; s3, selecting cepstrum coefficients of which the ratio is greater than a selection threshold to form a process state feature vector; and inputting the process state feature vector into a state classifier to obtain a current cable extrusion process state. According to the method, redundancy and noise interference are eliminated, so that the accuracy of process state monitoring is improved.
Owner:JIANGSU HONGFENG CABLE GROUP
Frequency hopping signal detection method under low signal-to-noise ratio based on FPGA (Field Programmable Gate Array)
The invention discloses a method for detecting a frequency hopping signal under a low signal-to-noise ratio based on an FPGA (Field Programmable Gate Array), which comprises the following steps of: at a transmitting end, adding a synchronous sequence with low side lobe, high anti-interference performance and self-adaptive adjustment of sequence length under different channel conditions to a frame header and a frame tail of a data frame, and after coding modulation and up-conversion at the transmitting end, carrying out frequency hopping on the frequency hopping signal under the low signal-to-noise ratio; the frequency hopping signals are converted into a group of frequency hopping signals with m hops; and at a receiving end, counting over-threshold frequency hopping signals, jointly judging whether the packet of data is valid data, and dynamically adjusting a correlation peak threshold according to a channel condition. According to the invention, the synchronization accuracy is improved.
Owner:CHINESE AERONAUTICAL RADIO ELECTRONICS RES INST
OTFS waveform low sidelobe optimization method and system based on improved seagull algorithm
The embodiment of the invention provides an OTFS waveform low sidelobe optimization method and system based on an improved seagull algorithm, and the method comprises the steps: initializing population parameters and integer coding sequences, calculating the distance peak sidelobe ratio PSLR of each integer coding sequence, carrying out the sorting, and determining a current optimal integer coding sequence; global search is carried out on the whole integer coding sequence population in the optimal sequence direction, local spiral search is carried out on optimal sequence element traversal, and each element preferentially keeps an improvement result with PSLR as an index; moving a non-optimal sequence to the updated optimal integer coding sequence while avoiding mutual collision, and calculating the centroid position of the current whole population; for the last 20% of solutions with poor performance in the population, generating a reverse solution on the basis of the solutions and the mass center of the population, if the reverse solution is better, performing replacement, reordering the updated population, and updating the optimal integer coding sequence; iterations are repeated until the maximum number of iterations is met, and a historical optimal distance sidelobe value is output.
Owner:GUANGZHOU UNIVERSITY
Data processing method, apparatus and device
Embodiments of the present application provide a data processing method, device and equipment, the method comprising: obtaining a sequence set, the sequence set comprising a plurality of sequences, there being at least one first sequence among the plurality of sequences, the self ambiguity function of each first sequence being a thumbtack shape, the sidelobe energy of the cross ambiguity function between each first sequence and other sequences in the sequence set being less than a first threshold; transmitting a signal according to the sequences in the sequence set, the signal being used for speed measurement and / or distance measurement. The accuracy of radar measurement is improved.
Owner:HUAWEI TECH CO LTD
A method and system for sidelobe reduction of OFDM signals suitable for polar encoding
The application discloses a kind of OFDM signal sidelobe reduction method and system suitable for polar encoding, method includes: sending end is encoded into length M bit by polar code encoder to length N information bit sequence;The element in by reordering device is rearranged to obtain by being arranged by split channel from good to bad order;Adjacent element in is modulated, and obtain;The first K elements of are mapped to the subcarrier in the middle of sending signal, and the last L-K elements are sequentially mapped to the subcarrier on both sides, and the power of L-K signals on both sides of subcarrier is reduced;IDFT conversion is carried out, and it is sent to carrier frequency modulation.The application can effectively reduce the sidelobe of sending signal, and does not affect receiving performance, and can further improve performance at high signal-to-noise ratio.
Owner:SOUTHEAST UNIV
Phase shift mask layout forming method and device, computer equipment and storage medium
The invention relates to a phase shift mask layout forming method and device, computer equipment, a storage medium and a computer program product. The method comprises the following steps: acquiring an initial mask layout, wherein the mask layout comprises a main pattern positioned in a light-transmitting area; performing exposure simulation based on the initial mask layout, and obtaining a sidelobe position area where a sidelobe pattern appears; determining a target graph in the main graph according to the side lobe position area; a shading auxiliary pattern is added into the target pattern to update the mask layout, and the size of the shading auxiliary pattern is smaller than the exposure precision. By adopting the method, the sidelobe pattern phenomenon can be improved.
Owner:BEIJING SUPERSTRING ACAD OF MEMORY TECH