43 results about "Bayesian melding" patented technology

The invention relates to the technical field of API security protection, and discloses an API anomaly detection method, system and device based on behavior fingerprints during operation and a medium, and the method comprises the following steps: collecting operation log data in an API calling process in real time; preprocessing the log data, extracting multi-dimensional behavior characteristics from the preprocessed data, and constructing an API behavior fingerprint vector; based on the historical behavior fingerprint vector, a Gaussian mixture model is adopted to establish a normal behavior reference model; dynamically determining the optimal clustering number of the Gaussian mixture model through a Bayesian information criterion; and inputting a behavior fingerprint vector called by the API in real time into the Gaussian mixture model, calculating an abnormal score, judging an abnormal behavior, regularly and incrementally updating parameters of the Gaussian mixture model, and re-optimizing the clustering number. According to the method, through dynamic behavior modeling and a closed-loop self-adaptive mechanism, the accuracy of abnormal recognition in a complex environment and the long-term stability of the system are remarkably improved.

The invention provides a photovoltaic power prediction method and device based on dual-mode hybrid analysis and electronic equipment, and relates to the technical field of power systems and photovoltaic power generation. The method comprises the following steps: acquiring a current photovoltaic power sequence; carrying out adaptive noise complete set empirical mode decomposition on the current photovoltaic power sequence to obtain multiple groups of intrinsic mode functions; based on a preset clustering algorithm and a Bayesian information criterion, performing clustering processing on the plurality of groups of intrinsic mode functions to obtain a plurality of data sub-pools; for each data sub-pool, inputting the plurality of intrinsic mode functions in the data sub-pool into a pre-trained BiLSTM model and a pre-trained SVR model to obtain a first prediction result and a second prediction result; performing fusion processing on the first prediction result and the second prediction result to obtain a target prediction result; and determining a photovoltaic power prediction sequence according to the target prediction results of all the data sub-pools. The method is used for improving the accuracy of photovoltaic power prediction and the reliability of a prediction result.

The embodiment of the invention discloses a GBIC-based multi-electric aircraft starting power generation system DBN model lightweight method, and relates to the technical field of reliability design and modeling of an equipment complex system.The GBIC-based multi-electric aircraft starting power generation system DBN model lightweight method comprises the steps that a DBN model of a starting power generation system is established, nodes in the DBN model correspond to key components and working states of the starting power generation system, and the nodes in the DBN model correspond to the key components and the working states of the starting power generation system; directed edges in the DBN model are used for describing the mutual relation between the nodes, a redundant structure in the DBN model is recognized, lightweight processing is carried out, and the fault state of the starting power generation system is recognized through the DBN model subjected to the lightweight processing. Aiming at the problems of complex reasoning calculation and low efficiency in the use process of the dynamic Bayesian analysis method of the equipment complex polymorphic system, the grey system theory and the Bayesian information criterion are introduced, the lightweight of the dynamic Bayesian network of the complex polymorphic system is realized, the redundant structure is eliminated, and the accuracy of the result is ensured.

The invention discloses an oil reservoir history fitting method based on graph lasso and set smooth multi-data assimilation, and relates to the technical field of oil and gas field development. The method comprises the following steps: firstly, acquiring to-be-optimized model parameters and observation data of a target oil reservoir, constructing an observation error covariance matrix and initializing a model parameter set, performing numerical simulation by utilizing an oil reservoir numerical simulator to obtain prediction data, constructing a joint state matrix, performing dimensionless standardization processing on the joint state matrix to obtain an empirical correlation coefficient matrix, and then, performing optimization on the joint state matrix. And executing a graph lasso algorithm combined with an extended Bayesian information criterion to obtain an optimal dimensionless sparse precision matrix, extracting correlation coefficient sub-blocks required by Kalman updating from the optimal dimensionless sparse precision matrix based on a Scherr's theorem, obtaining a robust data auto-covariance matrix through a reverse reduction physical quantity outline, calculating Kalman gain in combination with an observation error covariance matrix, and calculating a Kalman filter. And the model parameter set is updated until the preset condition is met, the reservoir history fitting model parameter set is output, and the stability and precision of reservoir automatic history fitting are improved.

The invention discloses a cascade water-wind-light multi-power system modeling method based on time-space correlation, and the method comprises the steps: building an autoregression integral moving average-generalized autoregression condition heterovariance model of wind power photovoltaic power and cascade hydropower station runoff, building an R-vine, C-vine and D-vine Copula function spatial correlation model through employing a generalized autoregression condition heterovariance value, and carrying out the modeling of a cascade water-wind-light multi-power system. And selecting an optimal spatial correlation model according to a Bayesian information criterion, an akaike information criterion and a logarithm likelihood value goodness of fit index. Based on the optimal spatial correlation model, constructing a scene generation method of Latin hypercube-Copula function sampling, performing scene generation on the wind power photovoltaic power and the runoff volume of the cascade hydropower station, and constructing a scene reduction method of contour coefficient optimization Kmeans clustering to reduce the generated scene. The invention provides a time-space correlation cascade water-wind-light multi-power system modeling method, and aims to analyze water-wind-light multi-energy complementary operation characteristics and provide reference for a scheduling mode among water-wind-light multi-energy.

The invention provides a construction interruption risk reasoning and plan generation method and device. The method comprises the following steps: acquiring multiple types of risk factors influencing construction interruption and a historical data set; taking a Bayesian information criterion as a scoring function, and constructing a directed acyclic graph structure based on the scoring function, a historical data set and a constraint set determined by domain knowledge; the constraint set is used for limiting whether edges between nodes exist or not in the construction process of the directed acyclic graph structure; based on the directed acyclic graph structure and the historical data set, a conditional probability table of the directed acyclic graph structure is determined, and the directed acyclic graph structure and the conditional probability table form a Bayesian network model; determining the risk probability of the target construction interruption event based on a Bayesian network model; and optimizing a preset construction plan combination based on the risk probability, and determining an optimal plan combination. According to the directed acyclic graph structure, objective data and domain knowledge are considered, and the accuracy of subsequent risk reasoning and plan generation is improved.

The invention discloses a multi-dimensional night urination behavior monitoring system based on rhythm features, and relates to the technical field of biomedical signal processing, and the system specifically comprises a data acquisition module, a rhythm feature extraction module, a urine volume dynamics modeling module, a clustering monitoring module and a real-time feedback module; collecting individual data in real time through IoT equipment and preprocessing the individual data; calculating a nocturnal urination frequency index, a nocturnal urination time concentration ratio, a urination interval rhythm variation coefficient and a deviation index based on the individual data, and performing rhythm feature extraction; performing quadratic polynomial least square fitting on the night accumulated urine volume, and calculating a urine volume acceleration index by using an obtained second derivative to quantify a urine volume generation trend; the method comprises the following steps: constructing and preprocessing a night urine multi-dimensional digital phenotypic vector matrix, fitting a Gaussian mixture model based on an expectation maximization algorithm of a Bayesian information criterion, automatically mapping individuals into four types of subtypes according to cluster center features, and outputting individual subtype labels and confidence coefficients; and obtaining a comprehensive risk score through normalized risk assessment.

The invention relates to the technical field of uncertainty probability modeling, and provides a limit load modeling method and device for a high-temperature adhesive, a computer readable storage medium and electronic device.The method comprises the steps that self-service sampling processing is conducted on an original limit load sample set of the high-temperature adhesive, and N self-service sample sets are obtained; n is an integer greater than 1; fitting each candidate probability distribution model by using each self-service sample set, and calculating a Bayesian information criterion value corresponding to each candidate probability distribution model; under each self-service sample set, selecting an optimal model based on a Bayesian information criterion value; and counting the frequency of each candidate probability distribution model selected as an optimal model under the N self-service sample sets, and determining the candidate probability distribution model with the highest frequency as an optimal fitting distribution model of the limit load data of the high-temperature adhesive. The invention provides a scientific and reliable method for high-temperature adhesive limit load distribution modeling.

The present application relates to the field of image processing. The processing method of dark current modeling and outlier detection based on Gaussian mixture model simulates the dark field condition of actual observation environment in the laboratory, and continuously shoots a group of photos at different temperatures according to the exposure time interval of the camera working in the actual observation environment; in each group of photos shot at different temperatures, the gray scale of each exposure time pixel is taken as a vector, and the characteristic vector of the pixel is modeled; the characteristic vectors of all pixels in the photos are clustered by using the Gaussian mixture model, and the Akaike information quantity BIC and the Bayesian information quantity AIC under the clustering are calculated. The present application compares the non-target part of the actually shot picture with the same part of the image shot in the simulated environment, obtains the temperature of the actual observation environment, and further obtains the dark current of the camera shot in the actual observation environment.

A toddler-inspired Bayesian learning method according to an embodiment includes: collecting information related to at least one task while an agent is performing exploration; and performing Bayesian inference regarding the at least one task by using the collected information as Bayesian informative priors.

The invention belongs to the technical field of load prediction, and particularly relates to an external load dynamic prediction method. Comprising the steps that S1, different driving working conditions are simulated through a virtual prototype, a dynamic load data set of the multi-crawler walking device is obtained, and the dynamic load data set is a set of dynamic load values of the multi-crawler walking device walking on the ground at each moment and characteristic parameters related to the dynamic loads; s2, performing data preprocessing on the dynamic load data set to obtain an initial structured data set; obtaining an optimal time window length based on a Bayesian information criterion, and obtaining a recurrent neural network prediction model in combination with the initial structured data set; and S3, obtaining a to-be-detected characteristic parameter sequence based on a rolling time window method, and inputting the to-be-detected characteristic parameter sequence into the recurrent neural network prediction model for processing to realize dynamic load online prediction of the multi-crawler walking device. The application range and the calculation efficiency of the dynamic load prediction method are improved to the maximum extent.

This invention relates to a method for highlighting spike discharge data of intracranial electroencephalogram (EEG) signals. The method involves collecting background noise data from the patient's brain without neuronal discharges, preprocessing the background noise data, automatically selecting the optimal order of an autoregressive (AR) model using the Akaike Information Criterion (AIC) and Bayesian Information Criterion (BIC), estimating the AR model coefficients using the Yul-Walker equation, and constructing a background noise model. The intracranial EEG signals to be processed are then subjected to high-pass filtering. A short-time Fourier transform (STFT) and window-based frame-by-frame processing strategy are used to subtract the spectrum of the signal from the noise. By adjusting the parameters of the spectral subtraction, noise removal and preservation of neuronal signal features are achieved.

The application discloses a kind of ocean element profile classification method based on clustering analysis algorithm, belong to marine data processing technical field, for ocean element profile classification, including obtaining original ocean element profile sample and pre-processing and standardization;Covariance matrix is constructed to standardization profile, and principal component is selected using cumulative variance contribution rate, and feature vector is constructed;Expectation maximization algorithm is used to estimate Gaussian mixture model parameter;Classification result is verified based on bayesian information criterion and physical interpretability;Ocean structure partition or water mass identification is carried out based on classification result.The application combines principal component analysis with Gaussian mixture model, significantly reduces the calculation complexity while retaining the main vertical variation information of the profile, does not need artificial preset label, has strong adaptability, interpretability and generalizability, can objectively and efficiently complete ocean element profile automatic classification, and is suitable for water mass identification, acoustic environment assessment and other various marine applications.

The invention discloses a biomolecule relation modeling method based on semantic consistency hypergraph contrast learning, and aims to model a complex relation between biomolecules by effectively combining a local structure and global semantic information. According to the method, firstly, local representation of nodes is enriched by expanding a message aggregation mechanism guided by a subgraph, and global context information is combined to improve the modeling precision of the biomolecular relationship; secondly, performing hypergraph reconstruction by adopting a double-layer consistency mechanism, and maintaining the consistency of a local structure and semantics at a node level and a hyperedge level through semantics and structure constraints; besides, soft clustering is carried out by using a Gaussian mixture model (GMM) and a Bayesian information criterion (BIC) strategy, hyperedge selection is further optimized, and structural consistency in a reconstruction process is ensured. In order to ensure the consistency of local and global semantics, the method introduces a multi-granularity comparison target in a comparison learning framework, performs training at node, hyperedge and extended subgraph levels, feeds back high-level semantic information to low-level semantic information through a cross-layer feedback mechanism, stabilizes the model and enhances semantic alignment between representations. Experimental results show that the provided framework is excellent in performance in node classification and clustering tasks on multiple reference data sets, and compared with an existing method, local and global semantic relationships can be better captured and aligned, and the hypergraph learning effect is remarkably improved.

The invention discloses an automatic division method and system for a satellite constellation orbital plane, and relates to the technical field of spaceflight measurement and control. The method comprises the following steps: firstly, calculating an orbital plane unit normal vector based on a satellite orbit inclination angle and an ascending node right ascension, and performing first-level spatial pointing clustering by adopting a density clustering algorithm to form an orbital plane group; secondly, in the same orbital plane group, by taking a semi-major axis and an eccentricity rate as characteristics, automatically determining an optimal shell layer number by utilizing a Gaussian mixture model and a Bayesian information criterion, and realizing second-stage orbital energy shell layer division; and finally, in the same shell layer, sorting and interval statistical analysis are performed on the right ascension of the ascending node, recursive subdivision is performed through dynamic threshold segmentation in combination with a range-based dual-condition verification mechanism, and fine division of a third-level orbital plane is completed. The method realizes full-process automation from orbit data to division results, has the advantages of high division precision, strong adaptability, good engineering practicability and the like, and is suitable for operation and maintenance management of large-scale heterogeneous satellite constellations.

The invention provides a grain safety toughness influence factor analysis method based on a Bayesian network. Relates to the field of food safety. The method comprises the following steps: screening grain safety toughness influence factors through a Spearman level correlation coefficient method, an adjusted R2 maximum criterion optimal subset and a random forest feature importance evaluation method, and determining indexes through a union set method; a natural breakpoint method is utilized, and quantitative indexes are converted into high, medium and low qualitative indexes by minimizing intra-group variances and maximizing inter-group variances; taking the grain safety toughness as a dependent variable and the final index as an independent variable, constructing a three-layer Bayesian network by using a simulated annealing algorithm, and evaluating and iterating through a Bayesian information criterion scoring function to obtain an optimal structure; on the basis, a reverse reasoning method is used, the probability that the grain safety toughness is high is set, the reverse reasoning probability and change of each index are calculated, and the influence effect is analyzed. Various factors are incorporated, and the influence effect of each factor can be systematically and comprehensively analyzed.

The present application relates to the technical field of image data processing, and more particularly to a concrete vibration quality evaluation method and system based on image analysis. The method comprises: acquiring a gray image of the surface of the newly vibrated concrete; constructing a region adjacency graph and extracting multi-dimensional features; calculating physical entropy weight based on the multi-dimensional features; performing region merging operation; identifying bubble clusters and calculating the quality evaluation index of the concrete surface according to the statistical characteristics of the bubble clusters; and outputting the concrete vibration quality evaluation result according to the quality evaluation index. The present application divides the concrete surface by the watershed algorithm and region adjacency graph, extracts multi-dimensional features, constructs a physical entropy weight model to evaluate the saliency, uses a boundary gray level priority queue and an adaptive multi-threshold intelligent region merging method to solve the problem of over-segmentation, and combines the Gaussian mixture model and the Bayesian information criterion to identify bubble clusters, so as to comprehensively evaluate the concrete vibration quality and improve the objectivity and accuracy.

The invention provides a coke oven gas generation amount prediction method based on multi-time scale decomposition, and relates to the technical field of coke oven gas generation amount prediction.The method comprises the steps that coke oven gas generation amount data obtained after smoothing processing is decomposed through EEMD, a plurality of IMF components are obtained, and high-frequency noise signals in the IMF components are removed in a Hilbert transformation mode; performing complexity evaluation on each IMF component by calculating a sample entropy, and reconstructing the IMF components into a periodic component and a trend component; calculating a mutual information coefficient to obtain key process parameters influencing the coke oven gas generation amount; lSTM added with an attention mechanism is used as a prediction model, the optimal hysteresis period input by the model is obtained through the Bayesian information criterion, and the coke oven gas generation amount is predicted with the periodic component, the trend component, the key process parameters and the optimal hysteresis period as input variables of the model. According to the method, the coke oven gas generation quantity prediction precision and reliability can be improved.

This application discloses a method, apparatus, equipment, and medium for assessing voltage sag fault risk, belonging to the field of voltage sag fault risk assessment. The method involves: collecting test points of the withstand characteristic curves of the electrical equipment under test under different voltage sag initiation angles and load conditions; each test point includes residual voltage and duration values; constructing multiple first Gaussian mixture models with different numbers of Gaussian components based on the test points; iteratively solving the optimization parameters of each model using the expectation-maximization algorithm until convergence, obtaining multiple second Gaussian mixture models; selecting a target Gaussian mixture model using the Bayesian information criterion; and finally, inputting the voltage sag test points to be assessed into the target Gaussian mixture model to obtain the assessment result characterizing the voltage sag fault risk of the electrical equipment under test. Therefore, by implementing this application, the problem of low accuracy in voltage sag fault risk assessment in the prior art can be solved.

The invention discloses a drought and flood sudden change event assessment method, which comprises the following steps: firstly, collecting rainfall series data, runoff series data and soil water content series data of a target area in a to-be-assessed time period, unifying a time sequence and a scale, and respectively calculating standardized indexes of the rainfall series data, the runoff series data and the soil water content series data; secondly, constructing a Copula function according to the three standardized drought and flood indexes, selecting and fitting the optimal Copula function by adopting a minimum informatization criterion and a Bayesian information criterion, performing normal inverse transformation on the function to obtain a comprehensive drought and flood index, and calculating according to the comprehensive drought and flood index to obtain a standardized drought and flood sudden turning index; and finally, performing grade division on the value of the standardized drought and flood sudden turning index to complete evaluation of the drought and flood sudden turning event in the target area. According to the method, the problems of single consideration factor, non-uniform judgment standard and insufficient consideration of land hydrological process in evaluation of the drought and flood sudden change event in the prior art are solved, and improvement of a drought and flood system evaluation system and risk identification analysis of the drought and flood sudden change event are facilitated.

This invention relates to the field of optical fiber communication testing technology, specifically a method for distinguishing adjacent fault points and estimating the distance between them using an OTDR. The method first acquires the OTDR backscattering curve of the optical fiber link under test, and then locates the starting position of the first fault point through preprocessing. Within a local analysis window, single-fault and double-fault physical models considering the system's finite pulse width and bandwidth characteristics are established. After baseline removal processing of the local observation signal, the optimal parameters of the two models are estimated using ordinary least squares and variable projection methods, respectively. Then, model selection is performed based on the Bayesian information criterion to determine the number of fault points, and when a double fault is identified, the estimated distance between the two fault points is output. This invention solves the problem of accurately distinguishing the number and estimating the distance between adjacent fault points when their responses overlap, significantly improving the OTDR's ability to distinguish and locate nearby fault points. It has high computational efficiency, good robustness, and is suitable for long-distance, large dynamic range optical fiber link testing scenarios.

The invention belongs to the technical field of electric digital data processing, and particularly relates to an electric power marketing business transaction diagnosis method based on dynamic self-adaption and feature fusion, which comprises the following steps: acquiring electric power marketing work order data, respectively extracting multi-scale features, and obtaining high-dimensional feature vectors; clustering the high-dimensional feature vectors by adopting a Gaussian mixture model, determining the number of scenes through a Bayesian information criterion, and performing dynamic evolution recognition on the scenes to obtain a scene division result; independently training an exclusive normal mode model for each divided scene; and for newly input power marketing work order data, calculating transaction scores by using the normal mode model corresponding to the scene, judging transaction, positioning features corresponding to transaction during transaction, analyzing a service root cause, and outputting a transaction diagnosis result. According to the method, accurate detection of power marketing work order transaction is realized through multi-scale feature fusion and dynamic scene adaptive modeling, and both technical accuracy and service practicability are considered.

The application discloses a kind of intelligent prediction methods for trans-critical working medium thermophysical property suitable for property mutation characteristics, obtain the property-temperature data of target working medium under specified working pressure by standard property database, using piecewise linear regression variable point detection algorithm based on residual sum of squares dynamic monitoring, realize the identification of working medium property-temperature curve inflection point and the adaptive division of temperature interval, based on bayesian information criterion, the polynomial order optimization of each segmented interval is carried out to balance fitting accuracy and complexity, and continuity constraint is applied at the connection point of segmentation, to build globally continuous segmented polynomial function.The application can realize the whole process automation of trans-critical working medium property-temperature function modeling of "data acquisition-inflexion point identification-order optimization-function generation", effectively overcome the subjectivity and limitation of artificial experience segmentation, while ensuring the accuracy of model, avoid overfitting risk, provide reliable support for engineering simulation and thermodynamic system design under trans-critical condition.

This disclosure provides an indoor temperature clustering method and apparatus for centralized heating systems, applicable to the field of precise control of centralized heating systems. The method includes: generating initial room temperature sequence data based on room temperature data acquired from multiple room temperature sensors; constructing room temperature observation vectors of a predetermined duration based on target room temperature sequence data, wherein the target room temperature sequence data is obtained by preprocessing the initial room temperature sequence data; determining a Bayesian information criterion value based on the number of room temperature observation vectors of the predetermined duration, and determining the number of model parameters corresponding to the minimum value of the Bayesian information criterion value as the target number of clusters; performing cluster analysis on the room temperature observation vectors of the predetermined duration according to the target number of clusters, and displaying the clustering results obtained when the cluster analysis converges.

The invention discloses a power system operation state evolution analysis method, device and equipment and a medium, and the method comprises the steps: obtaining the output data of various generator sets in a plurality of geographic regions and the power load data corresponding to each geographic region, so as to generate a power system operation time sequence; outputting a state transition probability matrix through a pre-trained hidden Markov model according to the operation time sequence of the power system; wherein the hidden state number of the hidden Markov model is determined according to an akaike information criterion and a Bayesian information criterion so as to ensure the optimality of the model; the state transition probability matrix is used for identifying an implicit operation state in the operation process of the power system; and acquiring real-time operation data of a target power system, and predicting an operation state corresponding to a preset future time sequence according to the real-time operation data and the state transition probability matrix. Compared with the prior art, the dynamic property and the accuracy of the evolution analysis of the operating state of the power system can be improved.

The application discloses a RCS information auxiliary multi-target tracking method and device in a clutter environment, and the method comprises the following steps: constructing a Bayesian RCS information recursive estimation mechanism; introducing the Bayesian RCS information recursive estimation mechanism into a Poisson multi-Bernoulli mixed filter, augmenting a target state vector, and respectively deducing a corresponding prediction density in a gamma Gaussian mixed form for a Poisson part and a multi-Bernoulli mixed part; respectively deducing an updating density in a gamma Gaussian mixed form for the Poisson part and the multi-Bernoulli mixed part; combining the updating density in the gamma Gaussian mixed form for the Poisson part and the multi-Bernoulli mixed part to construct a cost matrix and an assignment matrix of a global hypothesis; after the cost matrix and the assignment matrix are obtained, generating k optimal global hypotheses and weights corresponding to the global hypotheses, selecting a global hypothesis with the maximum weight, and obtaining a multi-target motion state estimation. The application improves the multi-target state estimation precision and improves the tracking performance of the multi-target.

The application provides a single-channel mechanical vibration signal blind separation method, system, device and medium, a single vibration sensor is used to obtain a mechanical vibration signal under a running condition as a single-channel mechanical vibration signal to be analyzed, the single-channel mechanical vibration signal is decomposed by using symplectic geometry modal decomposition to obtain a single-component signal, the single-component signal is reconstructed according to a frequency spectrum correlation coefficient to obtain a symplectic geometry modal component, the single-channel mechanical vibration signal, the symplectic geometry modal component and a residual term are used to form a multi-dimensional observation signal, a singular value decomposition is performed on a self-correlation matrix of the multi-dimensional observation signal, a Bayesian information criterion is used to obtain an estimation of the number of signal sources, the symplectic geometry modal component is selected according to a maximum time-domain correlation coefficient principle to form a new multi-dimensional signal observation matrix together with the original observation signal, and a blind source separation method based on time-frequency analysis is used to separate the multi-dimensional signal observation matrix. The application can separate multiple mechanical vibration source signals from a single-channel vibration signal.

The source number determination method, device, equipment and storage medium provided by the present disclosure determine a data matrix according to a received signal, calculate a sample covariance matrix of the data matrix and perform eigenvalue decomposition, calculate a linear spectrum statistic, calculate a generalized Bayesian information quantity corresponding to each source number, sort the generalized Bayesian information quantities from large to small, and determine the source number corresponding to the smallest generalized Bayesian information quantity as the estimation of the source number. By converting the original data matrix into a linear spectrum statistic, the main information contained in the data matrix is extracted, the description framework of the asymptotic behavior of the statistic is changed, and the requirement of accuracy for the signal-to-noise ratio is reduced through the dimension ratio p / n.

The invention provides a parameter estimation method and system for a cross-field ultrahigh-frequency wireless channel, and belongs to the field of wireless communication, and the method comprises the steps: constructing an ultrahigh-frequency terahertz channel measurement system, and obtaining a channel transmission function; establishing a cross-field domain channel signal model; executing a cross-field domain parameter estimation and optimization process by adopting a parameter estimation algorithm based on a maximum likelihood criterion; and carrying out channel characterization and analysis based on the estimation parameters. According to the method, near-field and far-field multipath components are intelligently distinguished by introducing the Bayesian information criterion, parameter estimation is performed by adopting the spherical wavefront model and the plane wavefront model respectively, and the problem of estimation deviation caused by neglecting a near-field effect and spatial non-stationarity in a traditional algorithm is effectively solved by combining iterative optimization and visible region modeling. According to the method, the nonlinear phase change, the multipath birth and death phenomenon and the frequency domain characteristic in the ultrahigh-frequency multi-antenna channel can be accurately captured, the parameter estimation precision and the residual performance are remarkably improved, and a key technical support and an experimental basis are provided for channel modeling, large-scale antenna array design and perception communication integration of a 6G ultrahigh-frequency terahertz communication system.

The embodiment of the application discloses a DBN model lightweight method of a multiple-electric aircraft starting power generation system based on GBIC, relates to the technical field of reliability design and modeling of complex equipment systems, and comprises the following steps: a DBN model of a starting power generation system is established, nodes in the DBN model correspond to key components and working states of the starting power generation system, directed edges in the DBN model are used for describing mutual relations between nodes, redundant structures in the DBN model are identified and lightweight processing is performed, and a fault state of the starting power generation system is identified by using the DBN model subjected to the lightweight processing.The embodiment of the application introduces a grey system theory and a Bayesian information criterion aiming at the problems of complex and low efficiency of reasoning calculation in the process of a dynamic Bayesian analysis method of a complex polymorphic system, realizes lightweight of the dynamic Bayesian network of the complex polymorphic system, eliminates redundant structures, and guarantees the accuracy of results.