52 results about "Density distribution function" patented technology

The invention discloses a sea area monitoring method and system based on a satellite remote sensing technology, and relates to the technical field of remote sensing, and the method comprises the steps: firstly, generating multi-stage and multi-band remote sensing raster data through a resource set, and secondly, obtaining joint sample vectors at different times through monitoring external environment data in a target monitoring region, a multivariable kernel density estimation algorithm is adopted to obtain a four-dimensional joint probability density distribution function, and an abnormal coverage area is obtained in combination with multi-stage and multi-band remote sensing raster data; then, based on the abnormal coverage area, identifying an enhanced abnormal unit, and performing dynamic correction operation; and finally, after dynamic correction, obtaining an abnormal connected region, analyzing an abnormal unit with an unstable form, determining an abnormal evolution sensitive region, and realizing a local adaptive optimization means based on the change of the abnormal evolution sensitive region.

The invention relates to the technical field of biomechanical detection and automobile safety evaluation, and discloses an automobile collision dummy abdomen safety test device and method. The testing device comprises a human body feature modeling module which is used for establishing a target population abdomen parameterized model based on statistical analysis, determining a key size design domain covering target population percentile and constructing a target population metrology database; the abdominal mechanical property simulation module is used for obtaining a human tissue relative density distribution function based on the hyperelastic constitutive model, taking the density distribution function as an input parameter for manufacturing a gradient honeycomb structure and simulating human abdominal mechanical properties through relative density gradient distribution in the thickness direction; the multi-mode sensor integration module adopts a distributed intelligent sensing network architecture and is composed of a sensing layer, a transmission layer and a processing layer. By integrating pressure, deformation, acceleration and tissue stress sensors and combining a real-time feedback algorithm, collision parameters are dynamically optimized, and the test precision and the biological fidelity are improved.

The invention relates to the technical field of formation data acquisition, in particular to a logging formation information intelligent analysis system which comprises a response model construction module, a dynamic weight generation module, a composite evidence distribution module and a multi-source information fusion module. According to the method, core calibration data are obtained, a probability density distribution function of basic lithologic logging response is constructed through a kernel density estimation algorithm, dependence on a fixed plate and a static cut-off value is eliminated, dynamic probabilistic description of stratum response characteristics is achieved, and then the initial reliability and sensitivity weight of response numerical values are calculated based on distribution; the method is used for adjusting evidence distribution, then calling an evidence theory combination rule to fuse adjusted multi-source information, determining the stratum state according to the highest cumulative reliability, effectively solving the problem of misjudgment caused by response overlapping, and remarkably improving the accuracy and objectivity of stratum lithology and fluid property identification.

The invention discloses a method for simulating sound propagation in a porous medium based on a QSGS-LBM, and the method comprises the steps: building a sound propagation physical model of an anisotropic porous medium based on the QSGS-LBM, and obtaining the density, pressure, speed and temperature distribution of a flow field during sound wave propagation; obtaining a density distribution function evolution equation and a temperature distribution function evolution equation based on the D2Q9 discrete velocity space; setting QSGS method parameters in the flow field area, and generating a porous medium model; obtaining a distribution function of each grid point after collision and migration, and applying boundary constraint conditions to the solid-liquid area based on the distribution function; and obtaining macroscopic variables on the grid points. According to the method, the iterative calculation time for multiple groups of porosity and structure parameters is remarkably shortened, the attenuation law of sound waves, sound pressure pulsation and temperature change caused by energy dissipation can be effectively captured, and the goodness of fit between a simulation result and a theoretical analytical solution is higher.

The present application relates to the technical field of position estimation, in particular to a sea mobile target motion prediction method and device based on limited prior information. The method comprises the following steps: acquiring prior information; constructing a tangent plane coordinate system based on the prior information; calculating a grid side length; determining a unit time step; constructing a voyage transfer probability density distribution function and a heading transfer probability density distribution function; determining a task area, performing grid processing on the task area based on the grid side length, performing discrete point processing on each grid, and acquiring a discrete point one-dimensional vector of each grid; constructing a transfer distance matrix based on a starting grid and a target grid, constructing a transfer angle matrix based on the starting grid, the target grid and a destination point, and acquiring a transfer probability matrix based on the transfer distance matrix and the transfer angle matrix. In this way, the target key area can be quickly searched through observation under limited prior information, thereby improving the target search perception efficiency.

The invention discloses a double-Beta distribution vector pulse width modulation method and system introducing an overlapping factor, and the method comprises the steps: constructing double-Beta symmetrical distribution introducing the overlapping factor, and constructing a probability density distribution function of a double-Beta symmetrical distribution random carrier period strategy; constructing a power spectral density function of the expanded random carrier switching period signal based on the random carrier signal; and carrying out power spectral density analysis on the power spectral density function of the expanded random carrier switching period signal based on the probability density distribution function of the double-Beta symmetric distribution random carrier period strategy to realize random carrier switching period permanent magnet synchronous motor control. According to the invention, local energy accumulation can be weakened, smooth spectrum transition can be realized, and adjustable control of a sideband voltage harmonic peak value can be realized. The overlapping factor-introduced double-Beta distribution vector pulse width modulation method and system can be widely applied to the technical field of pulse width modulation driving.

The application provides a turbine blade thermal barrier coating force-thermal coupling reliability evaluation method, which comprises the following steps: measuring and constructing a density distribution function of a thermal barrier coating microstructure and thermodynamic parameters, completing macroscopic complex turbine blade thermal barrier coating temperature field and strain field simulation, constructing a Monte Carlo sample space of random parameters at different positions of the blade, establishing a micro-scale force-thermal coupling finite element model and obtaining a life data set, building and training a deep learning agent model, and completing turbine blade thermal barrier coating reliability evaluation and sensitivity analysis. The reliability evaluation method provided by the application comprehensively considers the influence of the thermal barrier coating microstructure factor and the force-thermal coupling failure mechanism, solves the problems of high dimension, high nonlinear calculation cost and the like in the reliability evaluation of the complex blade thermal barrier coating, improves the accuracy and efficiency of the reliability evaluation, and provides an evaluation means for the safe application and optimized design of the thermal barrier coating.

The disclosure provides a gamma adjustment method, a computer readable storage medium and a computer program product. The gamma adjustment method comprises the following steps: obtaining a model of a to-be-tested module, determining a target model corresponding to the model and an error probability density distribution function according to the model, the target model being used to represent a mapping relationship between a gamma register value and a target influence factor, and the error probability density distribution function being used to represent an error distribution between a predicted gamma register value output by the target model and an actual gamma register value; obtaining a target influence factor value when the to-be-tested module displays a target gray scale picture, and inputting the target influence factor value into the target model to obtain a first gamma register value; detecting whether a display picture of the to-be-tested module meets a requirement when the to-be-tested module performs gamma adjustment by using the first gamma register value; and when the display picture does not meet the requirement, adjusting the first gamma register value by using the error probability density distribution function until the display picture meets the requirement.

The present application relates to the technical field of biomechanical detection and automobile safety evaluation, and discloses a device and method for testing the abdomen safety of a car crash dummy. The testing device comprises a human feature modeling module, a parameterized model of the abdomen of a target population is established based on statistical analysis, a key size design domain covering the target population percentile is determined, and an anthropometry database of the target population is constructed; an abdomen mechanical property simulation module, a human tissue relative density distribution function is obtained based on a super-elastic constitutive model, the density distribution function is taken as an input parameter for manufacturing a gradient honeycomb structure, and the abdomen mechanical properties of the human body are simulated through the relative density gradient distribution in the thickness direction; and a multi-modal sensor integration module, a distributed intelligent sensing network architecture is adopted, and the multi-modal sensor integration module is composed of a perception layer, a transmission layer and a processing layer. Through integration of pressure, deformation, acceleration and tissue stress sensors, and in combination with a real-time feedback algorithm, collision parameters are dynamically optimized, and the testing precision and biological fidelity are improved.

This invention discloses a design and manufacturing method for a uniform cross-section explosive load simulator based on gradient elastic metamaterials, relating to the field of impact loading. Addressing the problems of high cost per use and the susceptibility of variable cross-section elastic rods to local buckling instability under high-speed impact leading to waveform distortion in existing simulators, this invention, while maintaining the macroscopic uniform cross-section shape of the simulator, derives the ideal wave impedance gradient required to achieve the target explosive load based on the one-dimensional elastic wave propagation inverse design theory; establishes the mapping relationship between the relative density of a three-period minimal surface (TPMS) metamaterial unit cell and its equivalent mechanical parameters, and inversely solves the spatial relative density distribution function; extracts the waveform through dynamic impact finite element simulation, and introduces an impedance gradient correction factor to perform nonlinear iterative correction of the density function, obtaining a final three-dimensional metamaterial geometric model that accurately matches the waveform, and uses a flexible polymer material for additive manufacturing. This invention achieves the purely elastic, non-destructive, and reusable simulator, perfectly adapting to the stable firing of light gas cannons, and exhibiting excellent anti-instability capability and waveform fidelity under strong dynamic loads.

The present disclosure provides a multiphase flow simulation method and system based on heterogeneous mixed precision acceleration, which relates to the field of multiphase flow simulation, including: obtaining target object information to be simulated; using the target object information to establish a fluid mechanics model through the lattice Boltzmann method, discretizing the continuous fluid macroscopic behavior into tiny grids and time steps, and simulating the fluid macroscopic behavior by the collision and migration of several particles in the gridded fluid area; based on the initial density distribution function, iterating the fluid mechanics model in time steps, and simulating the fluid macroscopic behavior of all particles in parallel in each time step until the iteration stop condition is met, thereby obtaining a multiphase flow simulation result; the present disclosure provides a feasible solution that takes into account both efficiency and accuracy for industrial-grade multiphase flow interface dynamics simulation through dynamic threshold recognition and multi-level collaborative optimization.

The application discloses a sparse Bayesian learning vector acoustic direction finding method based on orthogonal acoustic intensity flow, and belongs to the technical field of array signal processing. First, an orthogonal acoustic intensity flow data model is constructed, an acoustic intensity flow is obtained by cross spectrum of sound pressure and vibration velocity channels, and acoustic energy flow density is obtained by acoustic pressure autospectrum. Then, a joint probability density distribution function is established by means of a sparse Bayesian learning model. Finally, according to maximum log-Bayes evidence estimation of signal power, spectral peak search is performed on the signal power estimation value, and the direction estimation of the target is realized. The method uses acoustic intensity and acoustic intensity flow as input, has the effect of suppressing isotropic noise and reduces the calculation amount. When the hyperparameters are updated for the first time, a deconvolution algorithm is introduced to avoid the judgment error of the number of signal sources and the direction of arrival caused by the proximity of two targets. Moreover, the method has good direction estimation accuracy and direction resolution capability, and can maintain good performance under the condition of low signal-to-noise ratio.

The application provides a simulation prediction method and system for slow positron source intensity in a research reactor, comprising the following steps: S1, reading arrangement information of components in a reactor core of the research reactor; S2, constructing a Monte Carlo model of the reactor core containing a slow positron source device, and obtaining neutron multi-group angular flux and photon multi-group angular flux information near the slow positron source generating device; S3, constructing a slow positron Monte Carlo model; S4, performing energy-angle double sampling to obtain an incident neutron energy probability density distribution function f n,ig,ia , an angle probability density distribution function f n,ia , an incident photon flux energy probability density distribution function f g,ig,ia , an angle probability density distribution function f g,ia , and a neutron-photon weight factor; S5, performing function sampling of particle types, energy and angle; and S6, obtaining slow positron distribution information generated in the slow positron generating device. The application accurately considers the whole life cycle of slow positron generation and transportation through multi-stage coupling, and realizes accurate prediction of slow positron source intensity.

The application relates to a radio frequency transmit field detection method and device, a radio frequency transmit field correction method, a magnetic resonance system, a storage medium and a computer program product. The method comprises: acquiring at least two groups of magnetic resonance echo signals. Each group of magnetic resonance echo signals is generated by exciting a detection object by a radio frequency transmit pulse with a different preset flip angle, and the different preset flip angles conform to a predetermined relationship. According to each group of magnetic resonance echo signals, a flip angle probability density distribution function corresponding to a radio frequency transmit field is determined. The flip angle probability density distribution function represents the probability density distribution of the flip angle of the radio frequency transmit field in the case that a characteristic quantity of the magnetic resonance echo signal is at a set value. According to the flip angle probability density distribution function and the magnetic resonance echo signal, the distribution of the radio frequency transmit field is determined. By using the method, the actual offset of the radio frequency transmit field is detected to determine the uniformity of the radio frequency transmit field.

The invention provides an X-ray free electron laser pulse transmission simulation method. The method comprises the steps that a three-dimensional light field of an X-ray free electron laser pulse light field generated through simulation is acquired; according to the type of the X-ray free electron laser pulse, different dimension reduction methods are selected, and a probability density distribution function of the X-ray free electron laser pulse in the six-dimensional phase space is determined; and selecting the random scatter points based on the probability density distribution function corresponding to the X-ray free electron laser pulse, and determining a target light source model of the X-ray free electron laser pulse light field in the six-dimensional phase space so as to evaluate the free electron laser pulse in the beam line. Six-dimensional phase space distribution is reduced to low dimension, six-dimensional phase space scatter points are obtained, transmission simulation of free electron laser pulses in a beam line is further carried out, the calculation speed is higher compared with a wave optics method, and rapid evaluation of transmission of XFEL pulses in the beam line is achieved.

This invention relates to a method and system for optimal distributed resource regulation considering multi-factor uncertainties, belonging to the field of distributed resource regulation technology. The method and system include an uncertainty assessment model considering variable correlations. First, considering variable correlations, the conditional probability density distribution function of the error between the predicted and actual values ​​of variables is measured. Then, discrete convolution with complex correlations is used to measure the uncertainty range of the difference or sum of variables. Finally, a robust optimal distributed resource regulation strategy considering multi-factor uncertainties is proposed. Different game strategies are constructed for different distributed heterogeneous components, and individual optima are achieved through strategy exchange and updates between game supply and demand entities. A potential function ensures that the local and overall objective functions are consistent with optimality.

The invention discloses an all-working-condition risk quantification method applied to a new energy civil aircraft power system, which comprehensively considers the influence of discrete factors and continuous factors, quantifies the performance risk of the power system under all working conditions into a probability density distribution function, and comprises the following steps: defining a discrete variable and continuous variable distribution set; establishing a power system performance change degree probability density function PDFcon under the influence of continuous variables; establishing a power system performance probability density function PDFsys under the common influence of the continuous variable and the discrete variable; and step 4, quantifying the system risk, namely quantifying the system risk under the common influence of the discrete variable and the continuous variable into a probability density distribution function for evaluating the risk of the system at the moment. According to the method, quantitative analysis of all-working-condition risks can be realized, and reliable support is provided for airworthiness verification, safety evaluation and engineering application of a new energy power system.

The invention belongs to the technical field of material processing simulation, and particularly relates to a simulation method for inclusion distribution in a high-temperature alloy deformation process. The simulation method covers the dynamic evolution of the distribution rule of the inclusions in the high-temperature alloy in the thermal processing and thermal deformation process. The method comprises the following steps: firstly, based on actual detection or early-stage simulation, acquiring the surface density distribution condition of the inclusions in the cast ingot, generating a data file representing the initial distribution of the inclusions, providing the data file to Deform software to calculate the position movement condition of the inclusions in the machining process, and performing nuclear density estimation on the distribution of the inclusions after exporting a calculation result; and obtaining a probability density distribution function of the inclusions in the deformation process of the high-temperature alloy. According to the method, the yield, the quality consistency and the service reliability of the deformation high-temperature alloy component are improved, and the method has important engineering application value and strategic significance for promoting high-quality and high-stability manufacturing of key components in the fields of aerospace, energy power and the like in China.

The invention discloses a mobile energy storage peak load shifting scheduling control method and device, a terminal and a medium, and the method comprises the steps: collecting historical output scene data according to renewable resources in a target power distribution network, and constructing a source load prediction model containing a power generation power probability density distribution function in combination with output characteristics; the output simulation parameters output by the source load prediction model are substituted into a preset double-layer structure mobile energy storage optimization scheduling model, and an upper optimization sub-model aims to maximize the net revenue of mobile energy storage configuration and is solved by a heuristic optimization algorithm; and the lower-layer optimization sub-model aims at realizing power distribution network loss minimization, solving by an adaptive wave search algorithm, and obtaining an optimal mobile energy storage scheduling strategy through collaborative optimization, so that efficient solving is realized, the efficiency bottleneck of a traditional algorithm in complex problem solving is broken through, the peak-valley difference of the power distribution network is reduced, and the peak clipping and valley filling effect is improved.

The invention relates to an unsteady state cigarette removing method and device based on a density distribution curve and a medium, and the unsteady state cigarette removing method based on the density distribution curve comprises the steps: obtaining the density distribution data of a to-be-detected cigarette; performing curve fitting on the density distribution data to obtain a first density distribution function of the cigarette to be detected; based on the first density distribution function and a second density distribution function set, whether the cigarette to be detected is in a steady state or not is judged; wherein the second density distribution function set comprises second density distribution functions of a preset number of steady state cigarettes; according to the method, the uniformity of tobacco shred distribution can be scientifically, reliably and completely represented, and the reliability of cigarette product quality detection is improved.

This invention relates to the field of position estimation technology, specifically to a method and apparatus for predicting the motion of a moving maritime target based on limited prior information. The method includes: acquiring prior information; constructing a tangent plane coordinate system based on the prior information; calculating grid edge lengths; determining the unit time step; constructing a range transfer probability density distribution function and a heading transfer probability density distribution function; determining the task area, performing gridding processing on the task area based on the grid edge lengths, and discretizing each grid point to obtain a one-dimensional vector of discrete points for each grid; constructing a transfer distance matrix based on the starting grid and the target grid, constructing a transfer angle matrix based on the starting grid, the target grid, and the destination point, and obtaining the transfer probability matrix based on the transfer distance matrix and the transfer angle matrix. In this way, with limited prior information, it is possible to quickly search for key target areas through observation, thereby improving the efficiency of target search and perception.

This invention relates to a method and equipment for probabilistic assessment of highway resilience under rainfall-induced landslide conditions, comprising the following steps: S1, calibrating a random rainfall model and the probability density distribution function of soil and rock parameters; S2, numerically simulating the sliding distance of the slope using a two-stage analysis of the finite element method and the material point method, and constructing a sample library of highway residual functions; S3, constructing a two-stage predictive proxy model for highway residual functions; S4, randomly sampling soil and rock parameters and rainfall events, and predicting highway residual functions based on the two-stage predictive proxy model; S5, constructing a probabilistic ladder recovery model for highway functions based on a decision tree, randomly sampling the recovery patterns of the highway after different landslide events, and calculating the highway resilience index based on the predicted value of the highway residual functions; S6, repeating step S5 multiple times to solve for the mean and standard deviation of the highway resilience index. Compared with existing technologies, this invention can achieve rapid and accurate assessment of the resilience level of slope highways.

The invention discloses an intermittent fault diagnosis and residual service life prediction method for a hybrid system, and relates to the technical field of fault diagnosis and residual service life prediction, and the method comprises the steps: carrying out the fault diagnosis of the hybrid system based on an extended Kalman filtering algorithm; constructing a double-random process model to describe a degradation process and a fault occurrence process of an intermittent fault element; estimating unknown parameters of the double random process model by using a multi-stage expectation maximization algorithm; a concept of an event-triggered collaborative failure process is proposed, and a probability density distribution function of the remaining service life of an intermittent fault element is derived based on a failure mechanism of the process. By utilizing the method, the residual service life prediction of the hybrid system under the intermittent fault can be realized.

The invention discloses an optical diffusion plate and a sound atmosphere lamp. The optical diffusion plate includes: a base material; the base material comprises a light incident surface opposite to the light emitting unit and a light emergent surface opposite to the light incident surface; a scattering layer is arranged in the base material, and the base material is filled with the scattering layer; the scattering layer comprises at least one kind of scattering particles, and the scattering particles are non-uniformly distributed at different preset positions in the scattering layer at different preset weight densities based on a weight density distribution function; wherein the weight density distribution function represents the influence of the preset position of the optical diffusion plate, the radial distribution contribution, the angle modulation contribution and the thickness distribution contribution on the reference weight density of the scattering particles. According to the embodiment of the invention, the hot spot phenomenon existing in the light-emitting unit can be effectively inhibited, the light-emitting uniformity is improved, and relatively high light-emitting efficiency can be ensured.

The application discloses a marine abnormal target discrimination method based on frequency analysis and grid adaptive expansion. A radar detection area is divided into grids with equal longitude and latitude span, and target frequency data in each grid is counted based on historical AIS track data of each type of target. Then, historical speed and acceleration of different types of targets are counted to obtain target normal activity representation expressed by a Gaussian probability density distribution function. A plurality of random samples are obtained from Dirichlet distribution, and target frequency data statistical results are recalculated in sequence to quantize uncertainty of the target normal activity mode. A cross-subspace support area of an arbitrary grid is formed through an adaptive expansion mechanism based on grid length and uncertainty similarity, and the target activity path coincidence average is calculated based on the uncertainty quantization result of the target type normal activity mode and the cross-subspace support area of the arbitrary grid, and the abnormal target is judged by combining the target speed and other feature coincidence calculation.

The application relates to a group building earthquake risk assessment method and device based on a probability density evolution theory and a storage medium, wherein the method comprises probability earthquake risk analysis and group building earthquake vulnerability analysis, specifically comprises the following steps: acquiring a historical earthquake catalog database; dividing a potential seismic source area; determining seismic activity parameters and ground motion attenuation relations; generating an earthquake risk curve; determining a consistent risk spectrum; generating a random artificial ground motion time history sample curve; acquiring a group building database; establishing a multi-degree-of-freedom bending-shearing type layer model and determining parameters; based on the random artificial ground motion time history sample curve, adopting a central difference method to determine a maximum interlayer displacement angle; determining a probability density distribution function of the maximum interlayer displacement angle; determining the probability of each building being in different damage states; changing an earthquake recurrence period to generate an earthquake vulnerability curve. Compared with the prior art, the application has the advantages of complete evaluation process and accurate evaluation result.

The application discloses a power equipment differentiation early warning method and device based on a fault probability. The method comprises the following steps: acquiring online monitoring data of a power equipment to be measured; in the case that the online monitoring data are distinguished according to different operating conditions, a first fault probability of the power equipment to be measured is calculated according to a voltage grade of the power equipment to be measured and a probability density distribution function of a fault threshold value under the voltage grade which is established in advance, and an early warning grade of the power equipment to be measured is determined according to the first fault probability; in the case that the online monitoring data are not distinguished according to different operating conditions, a second fault probability of the power equipment to be measured is calculated through a corrected fault probability function according to an ambient temperature of the power equipment to be measured and a corresponding correction coefficient under the ambient temperature, and an early warning grade of the power equipment to be measured is determined according to the second fault probability.

The invention discloses an LBM-based numerical simulation research method for a watertight air chamber device, and the method comprises the steps: S1, constructing an LBM-based wave numerical water tank, and simulating a process that waves enter an OWC air chamber; s2, according to the volume and the mass of air in the OWC air chamber at the initial moment in the simulation process, the initial condition of the gas state is obtained; s3, based on the gas state initial condition, updating the volume of air in the gas chamber at each time step, and based on the updated volume and the gas mass at the previous moment, calculating the current gas mass; s4, calculating the pressure intensity in the gas chamber according to the current gas mass and the updated volume, substituting the pressure intensity in the gas chamber into a free surface boundary condition of an LBM model, and updating a density distribution function; and S5, repeating the steps S2-S4 until a time termination condition is met, and completing numerical simulation of the wave energy conversion process in the OWC air chamber.

The application discloses a new weighted mel-frequency cepstral coefficient (MFCC) feature fusion method, which belongs to the field of underwater acoustic target recognition. The application solves the problem of poor separability of the fusion feature based on the existing weight selection method, and the effect of limited recognition accuracy improvement. The application obtains a first-order differential feature by performing differential operation on the MFCC feature, and then performs differential operation on the first-order differential feature to obtain a second-order differential feature. Then, the MFCC feature, the first-order differential feature and the second-order differential feature are linearly weighted to construct a fusion feature with the same dimension as the MFCC feature. The fusion feature of the application contains a large amount of information in the time dimension, and therefore is more robust than the MFCC feature. Moreover, the distance between the probability density distribution functions of the features of two different targets is calculated, and the maximum value of the feature distribution distance is found to determine the weight. The feature after the weight fusion ensures the maximum feature separability. The method of the application can be applied to underwater acoustic target recognition.

The application relates to the field of aerospace technology, and particularly discloses a high-efficiency infrared feature simulation calculation method based on adaptive pre-sampling and application, which relies on a reverse Monte Carlo method to predict the infrared features of an aircraft. By pre-sampling a rough imaging area, a radiation contribution probability density distribution function within a detection viewing angle is estimated based on a calculation result, and finally, according to the information, the number of sampling rays of different detection directions is adjusted, importance sampling is carried out in the imaging area, the problem of invalid sampling in some detection directions is solved, the calculation variance is reduced, and fast and accurate target infrared feature prediction calculation is realized. The application significantly improves the calculation speed of the traditional reverse Monte Carlo method. Through testing, under the premise of ensuring the same calculation accuracy, the calculation speed is improved by nearly 6.75 times.