51 results about "Bispectrum" patented technology

The invention provides a bridge structure monitoring method and device based on a microwave deformation radar, and relates to the technical field of bridge structure monitoring, and the method comprises the steps: obtaining the multi-point three-dimensional displacement data of a bridge structure through the microwave deformation radar, carrying out the thermal expansion pseudo displacement compensation and multi-point space smoothing through combining with temperature information, and obtaining a displacement field after environment correction; secondly, extracting a vertical component and separating the vertical component into a static deformation component and a dynamic vibration component by adopting variational mode decomposition; further analyzing and identifying a decoupling region through a time window coherence coefficient, performing recursive quantitative analysis, bispectrum analysis and energy distribution entropy calculation on a dynamic signal of the region, and constructing a high-order damage sensitive feature set; and finally, the dynamic characteristics and the static curvature change are fused to form a comprehensive degradation degree index, the deviation degree is judged according to working condition classification and the mahalanobis distance, and multi-dimensional and cross-working-condition degradation identification and risk early warning of the bridge structure are achieved.

The invention discloses an electric energy quality disturbance positioning identification method based on phase perception and multi-mode fusion, and relates to the technical field of electric power system monitoring and fault diagnosis. The electric energy quality disturbance positioning identification method based on phase perception and multi-modal fusion comprises the following steps: acquiring an original voltage signal of a three-phase electric power system; extracting a sample embedding vector of each phase based on the original voltage signal, comparing the sample embedding vector with a normal sample vector, and determining a disturbance phase with power quality disturbance in combination with an adaptive threshold value; performing time sequence feature vector extraction and bispectrum image feature extraction on the disturbance phase, and performing alignment and collaborative fusion to obtain fusion features; the electric energy quality disturbance type is identified based on fusion features, phase-level positioning of the three-phase PQD is achieved, through an innovative phase perception embedding and prototype comparison mechanism, accurate and rapid positioning of abnormal phases in a three-phase system is achieved for the first time under the condition of not depending on disturbance phase labels, and the core pain point of a traditional method is solved.

The invention relates to the technical field of refrigeration equipment state monitoring and data analysis, and discloses a freezer remote monitoring and fault prediction system, which comprises the steps of intercepting operation data of a freezer in a door closing silence period, calculating an environment dew point temperature sequence and extracting a unit temperature difference load fluctuation ratio sequence of a refrigeration system; based on the time change rate of the environment dew point temperature sequence and the unit temperature difference load fluctuation ratio sequence, an instantaneous cross bispectrum coupling potential energy sequence representing the nonlinear modulation relation of the time change rate and the unit temperature difference load fluctuation ratio sequence is constructed; then, a two-dimensional phase space hysteresis track is constructed with the environment dew point temperature sequence as the horizontal axis and the instantaneous cross bispectrum coupling potential energy sequence as the longitudinal axis, and the cross bispectrum hysteresis entropy of the dew point driving type load volatility is calculated based on the probability density distribution of the track and the directed circulation area; and finally, judging an operation state and outputting a fault prediction result by verifying whether the entropy value is within a historical reference interval.

The invention relates to the technical field of monitoring and early warning, and discloses a charging monitoring and early warning protection system, which comprises a signal acquisition module used for acquiring a bus voltage signal of a charging bus and performing windowing preprocessing; the feature extraction module is used for positioning carrier frequency and difference frequency from the preprocessed signal, estimating a bispectrum phase curve and calculating a correlation index, a scale curvature, time drift and an endothermic time constant estimation value; the early warning quantity generation module is used for combining and generating an early warning quantity based on the correlation index, the scale curvature, the time drift, the endothermic time constant estimation value and a preset parameter; and the early warning judgment module is used for carrying out standardization processing on the early warning quantity and outputting an alarm or non-alarm instruction in combination with the signal-to-noise ratio and a preset threshold value.

The invention discloses an unknown radiation source individual identification system, method and equipment. The invention particularly relates to an unknown radiation source classification and identification method based on electromagnetic signal SLIB, time-frequency grid-energy feature fusion and entropy penalty K-means clustering. According to the method, time-frequency grid-energy features and contour integral bispectrum features divided by a time-frequency spectrum grid are subjected to PCA + t-SNE dual dimension reduction and splicing fusion to form a fusion feature vector, so that nonlinear high-order statistical features of signals are included, local fine-grained energy change information of a time-frequency domain is reserved, and the fusion feature vector is more accurate and efficient. Therefore, the essential characteristics of the signal can be represented more comprehensively. Secondly, a K-means clustering method based on entropy penalty is constructed, an unsupervised adaptive strategy is adopted, dynamic cluster center adjustment and an information entropy weight updating mechanism are combined, and the number of clusters is adaptively adjusted. Meanwhile, a Gamma dynamic adjustment factor and a Beta weight mechanism are introduced, sample attribution calculation is optimized, and the stability and robustness of clustering are improved.

The invention relates to the field of radar signal processing, and provides a composite signal feature extraction method and device. The method comprises the following steps: respectively extracting local detail features and global context information of a to-be-extracted time-frequency graph and a to-be-extracted double-spectrum graph of a composite signal to obtain time-frequency graph features and double-spectrum graph features, carrying out channel exchange on the time-frequency graph features and the double-spectrum graph features, and determining effective channel features corresponding to each channel; obtaining a first fusion feature according to all the effective channel features; respectively extracting local detail features of each position in the to-be-extracted time-frequency graph and the to-be-extracted bispectral graph to obtain a first distinguishing feature and a second distinguishing feature, and performing feature fusion on the first distinguishing feature and the second distinguishing feature based on the attention weight to obtain a second fusion feature; and performing feature splicing on the first fusion feature and the second fusion feature to obtain a target feature, thereby solving the problem of relatively low recognition rate of the composite signal under the condition of relatively low signal-to-noise ratio.

The invention relates to a bispectrum adaptive threshold feature selection method based on a random forest. The method comprises the following steps: obtaining feature importance scores through a random forest model; calculating a first-order derivative of the feature importance based on the feature importance score, constructing a gradient spectrum, and obtaining a threshold candidate point of the gradient spectrum; constructing a cumulative importance contribution spectrum of the features, and obtaining threshold candidate points of the cumulative importance contribution spectrum; and synthesizing threshold candidate points of the gradient spectrum and the cumulative importance contribution spectrum, evaluating each candidate threshold point by optimizing a fractional function, and determining an optimal feature. According to the invention, bispectrum feature selection is systematically applied in the field of rainfall simulation for the first time, intelligent feature screening of high-dimensional meteorological data is realized, and technical support is provided for refined meteorological forecast; the method can be directly integrated into an existing weather forecast service system, and through accurate feature selection, forecast precision is improved, disaster loss is reduced, computing resource consumption is reduced, operation cost is saved, and model deployment and maintenance efficiency is improved.

The invention discloses a radiation source individual identification method based on a liquid neural network, and the method comprises the steps: firstly carrying out the preprocessing of a radar radiation source individual identification sample set, extracting a transient signal in the sample set, then extracting the diagonal bispectrum features in the sample set, dividing a training set and a test set, and marking an individual label for each individual; constructing a liquid neural network model as a radiation source individual identification model, training the model by adopting a training set, calculating classification loss by utilizing a cross entropy loss function, and obtaining the radiation source individual identification model through back propagation of model weight and training; and finally, inputting a test set into the trained model for prediction and judgment, and completing the effect evaluation of radar radiation source individual recognition. According to the method, the dynamic calculation capability of the liquid neural network is fully utilized, the time sequence characteristics of the signals can be effectively captured, the radar radiation source individuals are accurately identified, and the method has a good application prospect.

The invention discloses a communication signal modulation identification method and device, electronic equipment and a storage medium, and the method comprises the steps: obtaining a to-be-identified communication signal, and determining a signal feature map corresponding to the to-be-identified communication signal, the signal feature map comprising a bispectrum feature map and a power spectral density feature map; inputting the signal feature map into a feature fusion classification network model, and obtaining a modulation recognition result output by the feature fusion classification network model; wherein the feature fusion classification network model is a network model which is obtained through pre-training and is used for identifying the modulation mode of the communication signal. Based on the above technical scheme, the signal feature pattern corresponding to the communication signal is determined, and the signal feature pattern is identified through the feature fusion classification network model to determine the modulation identification result, so that the identification accuracy and efficiency of the signal modulation type are improved.

The invention relates to the technical field of equipment health assessment, and discloses a health assessment method and system based on industrial equipment electrical characteristics and electric fingerprint identification. The method comprises the steps of obtaining an electrical signal of industrial equipment, extracting a time domain statistical feature, a frequency domain harmonic feature, bearing fault feature frequency sideband energy, a wavelet packet energy entropy and a bispectrum amplitude feature in the electrical signal, and constructing an original feature vector; performing standardization processing on the original feature vector to obtain a comprehensive electric fingerprint feature vector, and calculating a distance value from the comprehensive electric fingerprint feature vector to a sphere center through a pre-established health reference model; and mapping the distance value into an equipment health degree score, positioning a fault feature component causing health degree reduction, and generating a fault diagnosis suggestion report. According to the invention, through deep fusion of multi-dimensional electrical fingerprint features, unsupervised health benchmark modeling and continuous quantitative evaluation, accurate evaluation and early fault early warning of the health state of the industrial equipment are realized.

The present invention relates to the technical field of radar signal, and specifically provides a radar interference identification method, system, terminal and storage medium based on bispectrum phase angle, including: acquiring observation data received by a radar; calculating a bispectrum phase angle matrix of the observation data; converting the bispectrum phase angle matrix into a gray-level co-occurrence matrix, and extracting image texture features based on the gray-level co-occurrence matrix; extracting the numerical values of the main diagonal from the bispectrum phase angle matrix to obtain a diagonal sequence, and performing spectrum analysis and sequence trend feature analysis based on the diagonal sequence; performing principal component analysis based on the image texture features and sequence trend features, and inputting the features after principal component analysis into a preset classification model to obtain the result of identifying a true target or a false target. The present invention improves the reliability of identifying a true target and an interference signal, and solves the problem that it is difficult to distinguish a towed interference signal by traditional methods.

The invention relates to the technical field of composite material damage diagnosis, and discloses a composite material damage diagnosis method fusing an attention mechanism and deep learning, and the method comprises the steps: 1, preparing a test sample; step 2, carrying out an impact test; step 3, obtaining a contour map of the acoustic emission signal; 4, marking according to the damage conditions of the composite material under different impact energies; 5, a damage diagnosis model is constructed and trained; 6, evaluating the damage diagnosis model; through the step 3, the step 4 and the step 5, the sound emission signal and the convolutional neural network are combined, the impact damage information of the composite material is obtained according to the signal bispectrum characteristics, the detection efficiency is improved, and the diagnosis result is more accurate.

The invention relates to the technical field of radar signals, and particularly provides a radar interference identification method and system based on a bispectrum phase angle, a terminal and a storage medium, and the method comprises the steps: obtaining observation data received by a radar; calculating a bispectrum phase angle matrix of the observation data; converting the bispectrum phase angle matrix into a gray level co-occurrence matrix, and extracting image texture features based on the gray level co-occurrence matrix; extracting numerical values of main diagonals from the bispectrum phase angle matrix to obtain a diagonal sequence, and performing spectrum analysis and sequence trend characteristic analysis based on the diagonal sequence; and performing principal component analysis based on the image texture features and the sequence trend features, and inputting the features after the principal component analysis into a preset classification model to obtain a result of the identified real target or false target. According to the method, the reliability of identifying the real target and the interference signal is improved, and the problem that the dragging interference signal is difficult to distinguish by a traditional method is solved.

The invention discloses a gearbox state monitoring method and system based on single-class normal data, and belongs to the field of fault diagnosis, and the method comprises the steps: obtaining the normal working condition data of a gearbox, and carrying out the nonlinear interaction bispectrum processing of the normal working condition data, and obtaining a training data set; constructing an interpretable differential diagnosis model, carrying out training optimization on the interpretable differential diagnosis model through the training data set, obtaining operation data of the gearbox in an unknown state, carrying out nonlinear interaction bispectrum processing on the operation data, and obtaining a differential diagnosis result; judging whether the processed operation data is fault data or not according to an interpretable differential diagnosis model; and when the judgment result is fault data, performing feature enhancement on the fault data according to the optimized interpretable differential diagnosis model to obtain a fault diagnosis interpretable result. According to the scheme, judgment can be carried out only through normal working condition data, the limitation of fault sample scarcity is overcome, and high precision, high noise immunity and good generalization ability are shown in gearbox fault diagnosis.

The invention relates to a communication radiation source individual identification method based on multi-domain feature adaptive fusion, and belongs to the technical field of communication radiation source individual identification. The method adopts a multi-domain feature extraction strategy comprising a time domain, an integral bispectrum and a power spectrum, breaks through the limitation of single-domain information, and then carries out the deep extraction of the feature information of multi-domain features, thereby achieving the recognition of the communication radiation source individual. Interference of irrelevant feature information is suppressed, and important feature information with individual distinction degree is enhanced. Further, deep correlation mining of multi-level features is realized through feature fusion and classification recognition, and the feature robustness in a complex electromagnetic environment is improved. Compared with a traditional single-domain identification method, the method effectively solves the problem that the radiation source features are not fully extracted in a non-cooperative scene.

A deep learning-based method for monitoring anesthesia depth based on high time-frequency resolution bispectral density includes the following steps: acquiring single-channel EEG data, preprocessing it, and dividing it into time segments; extracting features from the EEG data, and calculating a high time-frequency resolution wavelet bispectral matrix by combining variational mode decomposition and synchronous squeeze wavelet transform; constructing and training a deep neural network classification model based on partially convolutional neural networks and gated recurrent units; for test data, inputting the extracted features into the model, and selecting the state with the highest output probability (awake, anesthesia maintenance, or awakening) as the final prediction result for the test data; this invention uses single-channel EEG signals as input, greatly reducing the difficulty of acquiring clinical signals, and the proposed high time-frequency resolution bispectral features combined with a dedicated deep learning network have a strong ability to capture complex nonlinear EEG dynamic features and cross-subject generalization adaptability; therefore, this invention can perform high-precision, multi-classification, and real-time automatic monitoring of anesthesia depth.

The invention relates to the technical field of machine vision, and discloses an enameled wire surface defect detection and classification method based on machine vision, which comprises the following steps: firstly, collecting a wire scanning image, extracting a single-pixel time sequence of a fixed transverse position, performing frequency domain transformation after window processing, and obtaining a single-pixel time sequence; determining the position of a main peak according to the power spectrum in a range from zero frequency to Nyquist frequency; calculating a spiral bispectrum locking degree by taking a main peak as a reference; determining a phase sampling resolution according to the locking degree, and performing phase resampling on a single pixel time sequence and an adjacent pixel time sequence to generate phase-aligned two-dimensional blocks; then parameterizing channel gain and channel bias of each layer of the convolutional neural network by using a spiral bispectrum locking degree, and inputting a two-dimensional block into the network to obtain a defect probability; a binary cross entropy loss function is optimized by taking a power function of the spiral bispectrum locking degree as a sample weight; the arithmetic mean value of the defect probabilities of the same axial section is obtained, and when the mean value reaches or exceeds a preset threshold value, it is judged that defects exist.

The invention provides an array super-gain weak target detection method based on an adaptive diagonal beam spectrum. According to the invention, on the basis of the bispectrum diagonal slicing idea, the array gain is improved by processing the high-order spectrum information of the target signal in the beam forming process, and the background noise is effectively suppressed; meanwhile, by introducing self-adaptive weight design based on diagonal loading, interference of strong target side lobes is effectively suppressed, and the angle resolution of the algorithm is improved. In a word, the method provided by the invention can improve the array gain level, can effectively suppress the interference of a strong target sidelobe, and improves the detection capability of a weak target.

The application relates to a bearing radial clearance state monitoring method and device in a gear-shaft-bearing system. The method comprises the following steps: arranging an acceleration sensor at a position close to the bearing of a gear box of a gear-shaft-bearing-box fourteen-degree-of-freedom nonlinear coupling vibration system, continuously collecting vibration time domain signals of the system at different running moments, carrying out detrending and filtering processing on the vibration time domain signals, and obtaining pretreated signals; carrying out discrete Fourier transform on the pretreated signals, obtaining modulation signal bispectrum based on traditional bispectrum expansion; carrying out carrier frequency normalization processing on the modulation signal bispectrum, obtaining nine groups of MSB-SE amplitudes, superimposing the nine groups of MSB-SE amplitudes on (1, 2, 3) x GMF on (1, 2, 3) x BPFO, obtaining MSB-SE comprehensive indexes of each moment for monitoring the bearing radial clearance, drawing a curve of the indexes changing with running time, and determining a bearing radial clearance monitoring result. The accurate and online monitoring of the bearing radial clearance is realized.

The invention belongs to the technical field of motor fault diagnosis, and particularly relates to an alternating current motor fault diagnosis method and device based on modulation bispectrum and a storage medium. In order to solve the problems of signal distortion and the like in motor fault diagnosis, the method comprises the following steps of: acquiring a current signal and a voltage signal of an alternating current motor in real time, performing short-time Fourier transform on the current signal, and extracting a single-peak ridge line R1 of a time-frequency spectrogram TFS1; time-frequency analysis based on modulation bispectrum is carried out on the current signal, and a single-peak ridge R2 of a time-frequency spectrogram TFS2 is extracted; obtaining phase average power PI according to the current signal, the voltage signal and the single-peak ridge line R1; determining a characteristic frequency threshold H1 for judging whether a fault occurs or not according to the ratio of the phase average power PI to the rated power PR of the alternating current motor; acquiring a fault characteristic frequency amplitude HF according to the current signal I1 and the single-peak ridge line R2; and judging whether the AC motor has a motor broken bar fault or not and the severity of the fault according to the ratio of the fault characteristic frequency amplitude HF to the characteristic frequency threshold H1.

The invention provides a multi-dimensional feature fusion winter wheat weed detection method and system, and relates to the field of agricultural information technology and precision agriculture technology, and the method comprises the steps: constructing a deep learning model of WMGNet, the deep learning model of the WMGNet comprises a wavelet feature processing module, a bispectrum Mamba branch module, a graph volume integral branch module, a feature fusion module and a classifier which are connected in sequence; inputting the standardized winter wheat image into a deep learning model of WMGNet; extracting a multi-scale feature map of the standardized winter wheat image through a wavelet feature processing module; through a bispectrum Mama branch module, extracting long-range dependency features of the multi-scale feature map; non-local features of the enhanced features are extracted through a graph volume integral branch module; fusing the long-range dependency feature and the non-local feature to obtain a fused feature; and inputting the fusion features into a classifier, and outputting a detection result of the winter wheat high-resolution hyperspectral image.

The invention discloses an unmanned aerial vehicle low-altitude inspection fire real-time monitoring system and method based on deep learning. The method comprises the steps that S1, a visible light image, an infrared image and environment sensor data are collected; s2, performing preprocessing to form a bispectrum image; s3, inputting a double-branch encoder of the improved PP-LiteSeg model, extracting multi-scale features, and obtaining a time sequence evidence vector and a gas anomaly score according to environmental sensor data; s4, performing weighted fusion on the multi-scale features; s5, outputting a flame and smoke segmentation mask, and calculating the uncertainty of a segmentation result; s6, executing time sequence consistency constraint on adjacent frame mask segmentation results; s7, calculating a fire risk probability, and generating fire alarm information; and S8, when the re-cruise mechanism is triggered, the unmanned aerial vehicle is controlled for supplementary collection. The accuracy, the real-time performance and the robustness of unmanned aerial vehicle fire monitoring are remarkably improved.

The invention discloses a deception jamming identification method and system based on double-frequency-domain multi-feature and dimension reduction processing, mainly relates to the technical field of deception jamming detection, and is used for solving the problems that the feature resolution of a time-frequency analysis-based method is rapidly reduced under the condition of low signal-to-noise ratio; the number of features is limited, and each feature shows obvious linear inseparability in a high-dimensional space. Comprising the following steps: performing dimension reduction processing on signal bispectrum features by using an axis slicing method to obtain dimension-reduced bispectrum features; extracting five-dimensional axis integral bispectrum features of the bispectrum features after dimension reduction; constructing an original feature matrix by using the five-dimensional axis integral bispectrum features corresponding to all the echo data sequences, obtaining category label array vectors corresponding to the five-dimensional axis integral bispectrum features in the original feature matrix, and further calculating to obtain preset dimension reduction features corresponding to the original feature matrix; and obtaining a trained preset classification model by using the preset dimension reduction features.

The invention relates to the field of motor performance classification evaluation, and provides a motor performance small sample classification evaluation method based on a multi-mode SPM. Extracting four feature sample sets of original data signal slices, time-frequency diagrams, start-stop morphological parameter combinations and cyclic bispectrum graphic features from the data set; establishing an adaptive proportional decision model to divide a support set and a query set; firstly, support set data is input into a Swinin-T module for feature extraction, and then part of features are randomly selected and input into a multi-mode SPM module for feature enhancement; inputting query set data into a DA module and a multi-modal generative adversarial network module in parallel for data expansion, and after two paths are fused, screening and strengthening through a double-channel attention mechanism; positive and negative sample pairs are screened according to the physical distance of the motor performance grade, a loss optimization model is calculated and compared, and accurate evaluation is realized through a full connection layer and a classification function. The framework solves the problem that a traditional method is low in precision, improves the accuracy of motor performance classification evaluation, and is wide in application prospect.

The invention provides a radar signal sorting method, device and equipment based on multi-source intra-pulse characteristics. The method comprises the following steps: acquiring time-frequency intra-pulse characteristics, phase intra-pulse characteristics and bispectrum intra-pulse characteristics corresponding to radar signals to be sorted; and inputting the time-frequency intra-pulse features, the phase intra-pulse features and the bispectrum intra-pulse features into a trained radar signal sorting model to obtain a sorting result of the radar signals to be sorted. The radar signal sorting model comprises a feature mapping module, a gating attention mechanism fusion module and a sorting module, and the feature mapping module obtains time-frequency intra-pulse features, phase intra-pulse features and double-spectrum intra-pulse features of the same latitude and eliminates scale differences among the time-frequency intra-pulse features, the phase intra-pulse features and the double-spectrum intra-pulse features. The gating attention mechanism fusion module fuses the time-frequency intra-pulse features, the phase intra-pulse features and the bispectrum intra-pulse features, feature information of radar signals to be sorted is comprehensively expressed from multiple latitudes, the sorting module obtains a sorting result, and therefore the precision of the sorting result is improved.

The invention discloses a radiation source individual open set identification method based on bispectrum characteristics. The method comprises the following steps: firstly, preprocessing an electromagnetic radiation source signal, performing bispectrum estimation to obtain a bispectrum, calculating a contour integral bispectrum value according to an integral path, and inputting the obtained integral bispectrum value into a feature extraction module formed by introducing a one-dimensional residual convolutional network into a space attention module; and the feature extraction module extracts multi-scale individual fingerprint features to obtain an activation vector, Weibull model fitting prediction and OpenMax correction calculation are carried out in combination with a statistical extremum theory, and finally identification of an unknown category of electromagnetic radiation source individual in an open set environment is realized. According to the method, the calculation amount is reduced, the calculation efficiency is improved, and the identification accuracy of the electromagnetic radiation source individuals in the open set environment is improved.

The application discloses a back-stepping optimization method based on vortex detection signal depth features and thermal process parameters, relates to the technical field of vortex signal processing, and comprises the following steps: collecting vortex signals of a valve, and performing denoising processing on the vortex signals; performing principal component analysis on the denoised vortex signals by adopting a multi-scale principal component analysis method to obtain a principal component feature matrix; extracting depth feature characteristics and bispectrum characteristics from the denoised vortex signals; combining the extracted depth features, bispectrum characteristics and the principal component feature matrix into a comprehensive feature vector; constructing a valve parameter inversion model based on multivariate linear regression, taking the comprehensive feature vector as input, and inversely outputting valve parameters; establishing a relationship model based on the inversely output valve parameters and thermal process parameters, and inversely optimizing the thermal process parameters by an optimization algorithm. The application realizes accurate inversion of process parameters through vortex signal processing and a machine learning model.

Method for identifying individual radiation sources under digital predistortion of power amplifiers. The present invention relates to a method for identifying individual radiation sources. The purpose of the present invention is to solve the problem that existing power amplifier linearization technologies weaken the nonlinear effect of power amplifiers while improving signal quality, resulting in a decline in the performance of individual radiation source identification. The process is as follows: First, obtain a trained digital predistortion trainer; Second, extract multi-domain features from the radiation source signals output by the labeled digital predistortion trainer. The process is as follows: 2.1 Extract contour integral bispectrum features; 2.2 Extract horizontal visibility graph features; 2.3 Extract individual features based on intrinsic time-scale decomposition; Third, obtain a trained SincNet network; Fourth, extract multi-domain features from the radiation source signals to be measured output by the digital predistortion trainer; Fifth, identify the category of the individual signal of the radiation source to be measured after predistortion. The present invention is used in the field of individual radiation source identification.

The invention particularly relates to a communication system intelligent identification method based on multi-domain feature adaptive fusion. The method comprises the following steps: extracting secondary spectrum features and time-frequency features from various communication system signals; the quadratic spectrum features are preprocessed by using a normalization criterion, and the time-frequency features are preprocessed by using image cutting and a cubic convolution algorithm; processing the time-frequency features by using a convolutional neural network, and processing the secondary spectrum features by using a Transform network; performing adaptive fusion on the processed features by using a multi-head attention mechanism; and inputting the fused features into a classifier for classification and identification to obtain an identification result. The method can effectively realize intelligent identification of four different communication systems, shows excellent identification performance under a low signal-to-noise ratio, and can be widely applied to the technical field of cognitive radio.

The invention provides an online monitoring method and system for gas in transformer oil, a medium and electronic equipment. The online monitoring method for the gas in the transformer oil comprises the following steps: inputting the gas in the transformer oil into a first oil-gas separation module and / or a second oil-gas separation module, inputting the gas into a photoacoustic spectrum detection module and / or a gas chromatography detection module through a gas circuit, and obtaining detected gas data based on a degassing detection working mode; wherein the degassing detection working mode comprises a first working mode, a second working mode, a third working mode and a fourth working mode, and the gas circuit comprises a first gas circuit, a second gas circuit, a third gas circuit, a fourth gas circuit, a fifth gas circuit and a sixth gas circuit; and performing mutation analysis and data fusion on the detected gas data by using a bispectrum fusion algorithm to obtain a gas monitoring result. According to the online monitoring method for the gas in the transformer oil, the monitoring accuracy of the gas in the transformer oil can be improved.