57 results about "Atmospheric refraction" patented technology

The invention discloses a single-satellite target sight atmospheric refraction correction method and system based on multi-spectral range finding, and relates to the field of atmospheric refraction processing, and the method comprises the steps: determining a target radiation intensity ratio based on two radiation intensities on different wavebands at the same moment; obtaining observation sight lines of the satellite on the measured target on different wave bands at the same moment, and carrying out light trace tracking to obtain a light ray tracking trajectory; determining a target grid through which each ray tracing trajectory passes from the atmosphere gridding model, determining an extinction coefficient of each target grid, and constructing a target function of a radiation intensity ratio with respect to the height of the target from the ground in combination with a radiation intensity calculation formula; determining a target height from the measured target to the ground based on a target function and a target radiation intensity ratio, determining the position of the measured target according to a track point matched with the target height in each light ray tracing track, and determining a sight line vector after atmospheric refraction correction by combining the position of a satellite, therefore, high-precision atmospheric refraction correction under a single-star observation condition is realized.

The embodiment of the invention discloses an all-day and all-world time measurement method and device. A specific embodiment of the method comprises the following steps: constructing a short-wave infrared astronomical survey star catalogue; constructing a short-wave infrared astronomical geodetic survey star database according to the short-wave infrared astronomical survey star catalogue; optimizing the short-wave infrared astronomical geodetic survey star library to obtain an optimized short-wave infrared astronomical geodetic survey star library, and correcting atmospheric refraction errors in the optimized short-wave infrared astronomical geodetic survey star library; carrying out all-day fixed star point coordinate extraction on the shot multi-frame daytime star map to obtain fixed star point coordinates; and according to the star point coordinates of the fixed star, carrying out all-day astronomical observation world time calculation on the observation fixed star to obtain all-day world time. According to the embodiment, unified comparison of multi-period monitoring data is realized, and the engineering practicability of a monitoring result is improved.

The invention discloses a target sight atmospheric refraction correction method and system based on multi-satellite observation, and relates to the field of atmospheric refraction processing, and the method comprises the steps: obtaining all observation sight lines of different satellites for the same measured target; performing light trace tracking on the observation sight line to obtain a propagation trajectory of the observation sight line in the atmosphere; determining the distance between the trajectory points on every two propagation trajectories, determining two target trajectory points corresponding to the minimum distance on every two propagation trajectories, and determining a midpoint between the two target trajectory points; determining the position of the measured target according to each midpoint; the position of any satellite is connected with the position of the measured target, so that the sight vector of the measured target after atmospheric refraction correction by any satellite is obtained. According to the method and the device, the position of the measured target is determined more accurately, so that the atmospheric refraction correction precision and effect can be improved.

The invention discloses a neutral atmosphere refractive index calculation method and system suitable for different heights, and belongs to the technical field of communication and navigation. During modeling, monthly average reanalysis data is used as input to calculate the three-dimensional refractive index field of the neutral atmosphere, and horizontal, vertical and time domain change characteristics of the refractive index are represented by adopting a regular grid, a third-order index and a trigonometric function; when in use, the refractive index of any target point at any time within a global near-surface space range of 85 km can be calculated through space-time interpolation and elevation normalization only by giving the longitude, latitude, geodetic height and simplified Julian day of the target point. According to the method, the empirical modeling of the global neutral atmosphere refractive index field is realized by utilizing reanalysis data for the first time, the refractive index calculation precision at different height positions is improved through third-order index elevation normalization, and the method has important application value in the communication and navigation fields such as electromagnetic wave signal propagation path simulation and neutral atmosphere delay calculation correction.

The invention provides a troposphere anisotropy-considered real-time PPP positioning method, and relates to the technical field of satellite navigation and positioning, and the method comprises the following steps: S01, receiving real-time GNSS observation data, broadcast ephemeris data and precision correction data, carrying out detection and restoration of clock slip and cycle slip, data quality control and preprocessing of antenna phase correlation errors on the data to obtain a preprocessed data set; s02, calculating the solar altitude after atmospheric refraction correction according to each preprocessed data set and the geographic position and observation time of the observation station corresponding to each data set; and S03, based on the solar altitude and the satellite altitude. According to the method, solar altitude parameters are introduced, the troposphere anisotropy effect caused by solar radiation is effectively modeled, and the precision and convergence speed of real-time precise single-point positioning are remarkably improved.

The application discloses a kind of atmospheric time delay calculation method based on ray tracing, the present application relates to atmospheric time delay calculation technical field, the specific content of the present application is: obtaining multi-source meteorological data, extracting temperature, specific humidity, three kinds of key meteorological parameters such as air pressure, by optimizing interpolation to complete vertical layering blank and correct grid deviation, to construct three-dimensional atmospheric parameter field of time and space continuity;Based on atmospheric physical characteristics and electromagnetic wave propagation principle, calculate atmospheric refractive index and its gradient;With station location as starting point, set the angle of incidence of electromagnetic wave, adopt nonlinear dynamic step length strategy to track propagation path, and compare actual and vacuum propagation time to obtain time delay result.The present application considers data integrity and timeliness, avoids experience model deviation, and improves the calculation precision of atmospheric time delay.

The application provides an atmospheric waveguide detection system, method and device based on unmanned aerial vehicles, which comprises a server, a benchmark test system and a first unmanned aerial vehicle swarm comprising N unmanned aerial vehicles. The server determines the vertical height of the N unmanned aerial vehicles relative to a test surface at time t based on the first height relative to a benchmark point and the second height relative to the test surface of the benchmark test system at time t, and the third height relative to the benchmark point of the N unmanned aerial vehicles at time t. The server obtains the measurement data corresponding to the N unmanned aerial vehicles at time t, determines the corrected atmospheric refractive index of the N heights corresponding to the N unmanned aerial vehicles at time t based on the N measurement data and the N vertical heights, fits the N corrected atmospheric refractive indexes to determine a target curve, and calculates the atmospheric waveguide parameter at time t based on the derivative result of the target curve. The application adopts the unmanned aerial vehicle swarm mode to detect the corrected atmospheric refractive index at different heights, so as to calculate the atmospheric waveguide parameter, and the detection precision can be improved.

The invention discloses an atmospheric laser communication turbulence compensation method based on a novel Kolmogorov-Zakharov model, and belongs to the technical field of atmospheric laser communication. The objective of the invention is to solve the technical problem that the transmission quality and stability of atmosphere laser communication are affected due to reduction of compensation precision in a strong turbulence scene in the prior art. The method comprises the following steps: acquiring phase distribution and light intensity fluctuation of a laser signal in real time to obtain an atmospheric refractive index structure constant, mapping a model parameter and an atmospheric laser communication physical quantity, and updating a model based on the atmospheric refractive index structure constant; based on the model and a Helmholtz equation of atmospheric laser transmission, an atmospheric laser channel KZ turbulence random matrix model is obtained and solved, and a prediction result is obtained; and then turbulence dynamic compensation is carried out based on a prediction result. The method is mainly used for atmosphere laser communication turbulence compensation.

The invention discloses a shipborne marine atmospheric boundary layer refractive index profile detection system and method, and relates to the technical field of marine atmospheric environment monitoring and electromagnetic wave propagation safeguard.The method comprises the steps that sea-air downlink infrared radiation spectrum data and sea surface air temperature, relative humidity and air pressure data are obtained; constructing a background atmosphere profile by using the reanalysis data, and correcting an initial profile bottom layer by using sea surface observation air temperature, relative humidity and air pressure data to form a prior state vector; constructing an inversion cost function including an observation residual term, a background prior term and a sea surface boundary constraint term, and performing inversion to obtain an atmospheric temperature profile and a relative humidity profile; and calculating an atmospheric refractive index profile according to the temperature profile, the relative humidity profile and the air pressure profile. According to the method, the marine atmospheric refractive index profile can be continuously obtained under the shipborne dynamic observation condition, and reliable data support is provided for marine electromagnetic propagation environment analysis and waveguide diagnosis.

This invention relates to the field of satellite simulation technology, and discloses a method, device, and electronic equipment for simulating ultra-high resolution multi-view satellite images. The method includes: constructing a rigorous imaging geometric model between ground points in a preset three-dimensional scene and image points of a satellite sensor based on atmospheric refraction correction and solid tide correction; generating global illumination realistic shadows under the rigorous imaging geometric model based on solar radiation, and simulating the pixel output of the satellite sensor according to the global illumination realistic shadows to obtain a multi-view satellite image model; simulating different view images of the satellite sensor based on the multi-view satellite image model to obtain multi-view satellite images, and determining the rational function model of the rigorous imaging geometric model. This invention can overcome the limitations of traditional DSM / DOM data sources, taking into account the requirements of multi-view, ultra-high resolution, ultra-high precision, and fine detail, and achieving engineering simulation output of multi-view satellite images at the 0.2m level.

The application discloses a ground-based space target monitoring radar atmospheric refraction error correction method. The ground-based space target monitoring radar atmospheric refraction error correction method comprises the following steps: based on the vertical distribution of atmospheric refraction index and the radar elevation angle measurement value, the signal propagation path is accurately recursively calculated by using the refraction theorem and geometric relationship, the corresponding elevation angle, geocentric angle and target apparent distance of different heights are calculated, and a one-to-one corresponding relationship between the apparent distance and the distance, the elevation angle measurement error is established; then, according to the radar distance measurement value, the radar distance and the elevation angle measurement error are calculated by interpolation, and finally, the distance and the elevation angle measurement error caused by the atmospheric refraction of the space target monitoring radar are corrected. The ground-based space target monitoring radar atmospheric refraction error correction method has higher error calculation precision under the condition of given layer interval, has more stable error correction performance, and can more accurately correct the atmospheric refraction error of the space target monitoring radar.

The invention discloses a foundation construction laser leveling control device based on dynamic leveling. The foundation construction laser leveling control device comprises a laser reference unit and a construction end control unit. The laser reference unit is provided with a direct-drive holder attitude stabilization platform and an inertial measurement unit, the inner ring control frequency is not lower than 200Hz, a laser reference plane can be kept horizontally stable when a base vibrates or the attitude changes, an environment and refraction compensation module is arranged, and the refractive index gradient is estimated and the measurement error is corrected in real time through a temperature sensor, a humidity sensor and an air pressure sensor. The construction end control unit comprises a multi-source sensing and state estimation module and a prediction control module, and based on extended Kalman filtering, a laser receiver, inertial measurement and positioning data are fused, and the knife edge height state quantity is output. The device effectively solves the problems of reference deviation and height errors caused by foundation vibration, equipment shaking and atmospheric refraction in the construction process of a traditional device, and the leveling precision and the dynamic stability are remarkably improved.

The application discloses a Beidou InSAR atmospheric error compensation method based on region division, and divides the propagation path from a receiver to a PS point target into a propagation region and an estimation region. For the atmospheric error phase of the propagation region, it is regarded as a constant; and for the estimation region, the atmospheric refractive index is estimated by combining the imaging of different satellites, phase results and PS point selection results. The atmospheric refractive index of each PS point in the scene is estimated, the connectivity of the atmospheric refractive index of the scene is judged by using the median absolute deviation method, the atmospheric refractive index of the points which do not satisfy the connectivity, i.e. outliers, is corrected. Finally, the phases in the propagation region and the estimation region are added, so that the atmospheric phase of each target is obtained, the atmospheric phase compensation is realized, and the precision of deformation inversion and the effective early warning of disasters are improved.

This invention discloses an intelligent environmental pollution assessment and monitoring platform based on industrial big data, belonging to the field of data management technology. It analyzes the attenuation characteristics of echo signals through an attenuation anomaly feature acquisition module, calculates the impact of atmospheric refraction on the laser propagation path through an angle offset feature acquisition module, evaluates the pollutant measurement accuracy using a data prediction model through a measurement accuracy calculation module, and dynamically adjusts the laser power and emission angle in a measurement error correction module to improve measurement accuracy. This technology can effectively reduce the interference of meteorological conditions on lidar measurements, improve the accuracy and stability of pollutant concentration monitoring, and provide more reliable data support for environmental pollution monitoring.

The invention relates to a method and device for evaluating the power generation capacity attenuation rate of a solar cell panel, and the method comprises the steps: obtaining a sun-Mars ephemeris, and calculating a solar elevation angle, an azimuth angle, a solar fire distance, a sunlight incident angle and an ideal zenith irradiation dose per unit area at a current imaging moment according to the sun-Mars ephemeris; performing radiation correction on each image pixel value of the visible light image according to the terrain reflection influence factor of each pixel point to obtain a corrected pixel value sequence; based on a preset standard atmospheric refractive index and the correction pixel value sequence, using a Rayleigh scattering model to invert a relative atmospheric refractive index at an imaging moment; and based on the ideal zenith irradiation dose per unit area, the sunlight incident angle and the relative atmospheric refractive index, calculating the theoretical non-attenuation power generation power of the solar cell panel, and comparing the theoretical non-attenuation power generation power with the actual power generation power to obtain the power generation capacity attenuation rate. Through the method provided by the invention, atmosphere relative light depth changes at different imaging moments can be inverted, and the accuracy of theoretical non-attenuation generation power calculation is improved.

The invention discloses an atmospheric time delay calculation method based on ray tracing, and relates to the technical field of atmospheric time delay calculation, and the method specifically comprises the steps: obtaining multi-source meteorological data, extracting three types of key meteorological parameters of temperature, specific humidity and air pressure, complementing a vertical layering blank through optimization interpolation, and correcting grid point deviation. A space-time continuous three-dimensional atmospheric parameter field is constructed; calculating an atmospheric refractive index and a gradient thereof based on atmospheric physical characteristics and an electromagnetic wave propagation principle; the observation station position is taken as a starting point, an electromagnetic wave incident angle is set, a propagation path is tracked by adopting a nonlinear dynamic step length strategy, and actual propagation time and vacuum propagation time are compared to obtain a time delay result. According to the method, data integrity and timeliness are considered, empirical model deviation is avoided, and the calculation precision of atmospheric time delay is improved.

The invention belongs to the technical field of radar signal processing, and particularly relates to a real-time high-precision neutral atmospheric refraction error compensation method for a ground-based distributed radar. The method specifically comprises the following steps: step 1, constructing a neutral atmospheric refractive index profile model in sections according to the altitude, and setting initialization parameters of the model; step 2, introducing a line-of-sight neutral atmospheric retardation estimated by a real-time global navigation satellite system meteorological method as an observation loss item of a cost function, and introducing a troposphere part refractive index profile provided by numerical weather forecast data as a structural similarity loss item, constructing a cost function containing the observation loss item and the structural similar loss item; step 3, updating to-be-optimized parameters of the neutral atmospheric refractive index profile model based on the cost function to obtain an optimal profile model, and determining a current optimal neutral atmospheric refractive index profile; and 4, realizing neutral atmospheric refraction error compensation by using the neutral atmospheric refraction index profile.

The present application relates to a kind of troposphere scattering channel modeling method based on parabolic equation, belong to wireless communication technical field.First, based on the meteorological data mode of WRF is obtained meteorological data in the modeling region of scattering communication channel, including three meteorological parameters such as air pressure, temperature, humidity, calculate correction atmospheric refractivity M, obtain atmospheric correction refractivity profile n a ;Second, according to atmospheric correction refractivity M, calculate refractivity vertical gradient M', atmospheric refractivity structure constant is characterized then, refractivity disturbance caused by turbulence is substituted, describe random disturbance n f ;Finally, atmospheric correction refractivity profile n a With random disturbance n f It is substituted into Feit-Fleck type wide-angle parabolic equation derived from two-dimensional Helmholtz equation, numerical solution is carried out using step Fourier transform method, constructs troposphere scattering model.The method characterizes the influence problem of atmospheric turbulence on radio wave propagation.

A device for measuring atmospheric refraction error combining dispersion and beam drift methods is disclosed, belonging to the field of atmospheric refraction error measurement technology. It solves the technical problems in existing optical measurement methods for atmospheric refraction error, where turbulence parameter measurements neglect secondary influencing factors, while dispersion methods require high precision in dispersion angle measurement. The measuring device of this invention includes a dual-wavelength laser, a collimating lens, a power attenuator, a focusing lens, and a high-resolution dual-color CCD arranged sequentially along the light propagation direction. The dual-wavelength laser outputs dual-wavelength laser light, which is collimated by the collimating lens and then incident on the power attenuator to achieve the same optical power. The laser light then passes through a turbulent region and is focused onto the high-resolution dual-color CCD by the focusing lens. Atmospheric refraction error is calculated using both beam drift and dispersion methods, thus achieving atmospheric refraction error measurement. This measuring device has a simple structure and can obtain high-precision results with relatively low-precision measurements.

The application provides a water area equal-span large-span bridge elevation precision transmission method, which comprises the following steps: setting an elevation encryption point on the two banks; setting an elevation point on the left side of the odd pier and on the right side of the even pier; erecting a total station on the odd (even) pier; determining the first elevation of the elevation point of the adjacent even (odd) pier by the trigonometric leveling method, and calculating the height difference between the two points from the first elevation; determining that the height difference between the adjacent even piers constitutes an observation route 1, and the height difference between the adjacent odd piers constitutes an observation route 2; the observation routes 1 and 2 and the elevation points on the two banks constitute a checking condition, and the second elevation value of each pier is obtained by rigorous adjustment. The method can effectively weaken the adverse effects of the earth curvature, atmospheric refraction, instrument axis system error, instrument height and prism height on the trigonometric leveling precision, simplify the height difference calculation procedure, and has the advantages of improving the measurement precision and operation efficiency.

The invention discloses a small-angle method full-automatic monitoring system and a monitoring method, and belongs to the technical field of safety monitoring of water conservancy and hydropower engineering. The system comprises a control host, a master controller, two automatic tracking total stations and a plurality of rotatable prism mechanisms, the master controller and the two automatic tracking total stations are in communication connection with the control host, and the rotatable prism mechanisms are in communication connection with the master controller. Full-automatic observation of the dam horizontal displacement collimation line method can be realized, and the system has the advantages of high automation degree, high efficiency, manpower saving, low long-term investment cost and the like; in addition, the observation frequency and the observation time can be flexibly set through the control host, and the influence of atmospheric refraction is small. Most importantly, the method can quickly respond under the conditions of earthquakes, overproof floods and the like to obtain the horizontal displacement of the dam, and has important significance in improving the safety monitoring capability of the dam, guaranteeing the life and property safety of downstream people and the like.

Disclosed is a method for joint estimation of stellar atmospheric refraction and star tracker attitude, including: capturing, by a star tracker, an image of stars, and recognizing the image to obtain a matching relationship between an observed star and a reference star; transforming the reference star to a terrestrial reference frame based on time and position of observation to obtain a true zenith distance of the reference star; calculating an estimated stellar atmospheric refraction based on a simplified atmospheric refraction model, the true zenith distance, and an initial atmospheric refractive coefficient, and subjecting the reference star to stellar atmospheric refraction compensation; calculating the star tracker attitude, and re-projecting the observed star to the terrestrial reference frame to calculate the observed stellar atmospheric refraction and the stellar atmospheric refraction error; if the observed stellar atmospheric refraction is misaligned with the estimated stellar atmospheric refraction, adjusting the atmospheric refractive coefficient based on the stellar atmospheric refraction error, and then recompensating the reference star and calculating the attitude, till the observed stellar atmospheric refraction is aligned with the estimated stellar atmospheric refraction, whereby joint estimation results of the stellar atmospheric refraction and the star tracker attitude are obtained. The disclosure realizes real-time, autonomous estimation and cancelation of stellar atmospheric refraction without being limited by external sensors or empirical formulae.

The invention belongs to the technical field of GNSS positioning, and discloses an atmospheric water vapor profile reconstruction method and system based on GNSS troposphere chromatography, and the method comprises the steps: carrying out the preprocessing of collected GNSS observation data, obtaining a carrier phase and a pseudo-range observation value, and obtaining the total troposphere delay ZTD; obtaining zenith troposphere dry delay ZHD based on the environmental parameters of the observation station and a Saastamoinen model, and further obtaining inclined troposphere wet delay SWD; and reconstructing a three-dimensional chromatography water vapor profile of the atmospheric refractive index field based on inclined troposphere wet delay SWD and a chromatography imaging algorithm. The GNSS observation data is received and processed in real time, the water vapor profile in the troposphere is accurately reconstructed, the distribution and transmission process of water vapor in the atmosphere can be understood, and more reliable data support is provided for the fields of weather prediction, climate research and the like.

The invention relates to a troposphere propagation delay modeling method for land-based navigation signals, and belongs to the technical field of radio navigation. According to the method, near-surface water vapor gradient distribution is accurately described through a refractive index profile function, an atmospheric refractive index model with temperature, humidity and air pressure as variables is innovatively designed, and a low-elevation-angle signal refraction path is tracked and analyzed in combination with a non-uniform atmospheric layering path; the pseudo-range measurement error caused by neglecting the refraction curvature and the meteorological change in a low-elevation (less than 15 degrees) scene of a traditional model is solved, the real-time meter-scale positioning correction capability is provided for air unmanned equipment in a satellite denial environment, and the reliability of a land-based navigation system in a complex environment is remarkably improved. The method is easy to implement, the pseudo-range measurement precision is effectively improved, and the application requirement is met.

The application discloses a lunar-orbit satellite laser ranging data error correction and precision analysis method, and belongs to the technical field of deep space measurement, and comprises the following steps: setting inner coincidence error and outer coincidence error of the whole laser ranging process; calibrating and modeling the system error and random error in the inner coincidence error, correcting the system delay by using the calibration target in real time, and synthesizing the standard deviation of random error to evaluate the data precision; establishing a physical model for the relativistic effect, atmospheric refraction, earth tide, station offset and corner reflector offset in the outer coincidence error to correct the outer coincidence error; and finally comparing with external reference values, calculating the root mean square error of residual error to evaluate the data accuracy. The application realizes systematic correction and precision quantitative analysis of the whole link error of the lunar-orbit satellite laser ranging, significantly improves the ranging data quality, and provides reliable data support for high-precision lunar-orbit orbit determination.

A multi-view on-orbit geometric calibration system for agile imaging satellite: in view of the problem that imaging parameters change during the launch and on-orbit operation of agile imaging satellite, affecting the high-precision positioning of images, a rigorous imaging geometric model is constructed according to the collinear imaging principle, and the on-orbit geometric calibration of agile satellite imaging parameters is carried out through the internal and external step-by-step calibration strategy. The change of imaging angle of agile satellite causes the change of image imaging height, and the influence of atmospheric refraction is intensified, so that the imaging image calibration coefficient of the nadir point of the agile satellite is directly used for the geometric calibration of the inclined imaging image, and the uncontrolled positioning precision is reduced. By establishing the relationship between the change of imaging angle and the compensation of external calibration coefficient, the external calibration coefficient of the inclined imaging image is compensated, and the problem of the decline of uncontrolled positioning precision caused by the change of imaging height and the intensified influence of atmospheric refraction on the inclined imaging image is relieved. The present application can effectively realize the on-orbit geometric calibration of agile imaging satellite, and provide support for the subsequent high-precision geometric processing of images.

The invention provides a low-earth-orbit satellite communication occlusion pre-judgment method and system, and relates to the technical field of low-earth-orbit satellite communication, and the method comprises the steps: obtaining a future trajectory sequence of a low-earth-orbit satellite, a future trajectory sequence of a ground terminal, and topographic data and meteorological data of a ground region of the low-earth-orbit satellite; generating a communication link space-time trajectory according to the future trajectory sequence of the low-orbit satellite and the future trajectory sequence of the ground terminal; performing space-time binding on the topographic data and the meteorological data to generate a space-time incidence matrix; and according to the space-time incidence matrix, determining sampling point distribution and sampling step length of the terrain profile of the to-ground area, and performing dynamic shielding pre-judgment by combining an atmospheric refraction correction model and a meteorological attenuation model to obtain a shielding pre-judgment result of the low-orbit satellite in a preset future time period. According to the invention, through multi-source data fusion, dynamic space-time trajectory generation, space-time binding, adaptive sampling and a comprehensive attenuation model, the precision and timeliness of low-orbit satellite communication occlusion prejudgment are significantly improved.

The invention relates to a real-time multi-speed measurement equipment radio wave refraction error correction method, and belongs to the field of spaceflight measurement and control. The invention designs an error correction method for radio wave refraction of multiple speed measurement devices for real-time tasks on the basis of a hierarchical integral iteration idea, and aims to improve the element measurement precision of the multiple speed measurement devices in real time, calculate troposphere refractive indexes at different heights by using a Hopfield model through temperature, humidity and pressure data collected on the ground, and improve the measurement accuracy of the multiple speed measurement devices. And an initial value calculation coefficient of the target relative to the observation station height is fitted, the apparent distance and the real height of the rocket can be obtained through one-time integration, and finally atmospheric refraction correction values of radar ranging and pitching are obtained. In order to further improve the calculation efficiency, especially the integral calculation speed when the flight height of the rocket is relatively high, a Gaussian integral method which is easier to realize by computer operation is adopted, Gaussian integral constants are used in calculation, the purpose of improving the integral efficiency is achieved, and the correction precision of the method is far higher than that of an existing real-time experience correction model.

The application relates to the technical field of satellite communication, in particular to a dynamic beam adjustment system for medium and low orbit satellite communication. The system comprises a beam demand perception unit, a dynamic beam calculation unit, a beam execution adjustment unit and a satellite-ground coordination unit. The dynamic beam calculation unit offsets the influence of complex environment on beam coverage through a multi-factor collaborative compensation mechanism. The beam execution adjustment unit realizes accurate beam pointing and interference suppression through an adaptive phase optimization algorithm. The application calculates the theoretical pointing angle of the beam based on spherical geometry, determines the compensation amount in combination with satellite movement, user movement and atmospheric refraction, dynamically adjusts the weight of each compensation amount and combines the compensation amounts into a total compensation amount according to the satellite elevation angle, user terminal movement speed and communication link signal-to-noise ratio, and finally obtains the actual beam pointing angle, so that the coupling influence of multi-factors on beam coverage in complex environment is effectively offset, and the beam pointing precision is improved.

The application provides a low-orbit satellite communication shielding prediction method and system, and relates to the technical field of low-orbit satellite communication.The method comprises the following steps: acquiring a future trajectory sequence of a low-orbit satellite and a future trajectory sequence of a ground terminal, and topographic data and meteorological data of a region covered by the low-orbit satellite; generating a communication link space-time trajectory according to the future trajectory sequence of the low-orbit satellite and the future trajectory sequence of the ground terminal; performing space-time binding on the topographic data and the meteorological data to generate a space-time correlation matrix; determining the sampling point distribution and the sampling step of the topographic profile of the region covered according to the space-time correlation matrix, and combining an atmospheric refraction correction model and a meteorological attenuation model to perform dynamic shielding prediction, so as to obtain a shielding prediction result of the low-orbit satellite in a preset future time period.The application significantly improves the accuracy and timeliness of low-orbit satellite communication shielding prediction through multi-source data fusion, dynamic space-time trajectory generation, space-time binding, adaptive sampling and a comprehensive attenuation model.