32 results about "Satellite visibility" patented technology

The invention relates to an agile satellite visibility analysis method based on an along-longitude push-broom mode, relates to the technical field of satellite task planning and visibility analysis, and solves the technical problem that an existing target visibility analysis method is difficult to accurately reflect a real visibility state in a satellite continuous imaging process. The method comprises the following steps: acquiring an imaging center point coordinate, an imaging duration, satellite imaging parameter information, satellite orbit information and a target shooting period; the visibility of the imaging center point in the shooting period is calculated, division is carried out according to the number of orbital circles, and a visible information set of the center point is obtained. The agile satellite visibility analysis method based on the along-longitude push-broom mode is suitable for efficient visibility calculation of an agile optical remote sensing satellite and oriented to an along-longitude imaging scene, the visibility state of a target in the imaging process can be accurately evaluated on the basis of considering satellite attitude maneuver characteristics and orbit constraints, and the accuracy of the visibility analysis is improved. Therefore, accurate support is provided for task arrangement and resource scheduling.

The invention discloses an engineering surveying and positioning method and system based on Beidou. The method comprises the following steps: S1, establishing an oil field operation environment three-dimensional model, and performing satellite visibility and multipath prediction; according to the invention, by constructing a multi-path geometric model and a dual-antenna array discrimination and weighted suppression algorithm, reflection interference caused by a metal facility dense environment in a well site and a station site is effectively weakened; by fusing a local DEM terrain model and earth surface reflection characteristics and introducing vertical Kalman filtering, the stability and precision of Beidou elevation calculation are significantly improved; under the scene of insufficient visibility such as shielding of a drilling machine and large equipment, continuous and high-reliability positioning capability is kept through a tight coupling fusion strategy of IMU and vision assistance, so that high-robustness and high-precision Beidou engineering measurement positioning can be realized in a complex environment of an oil field.

The invention discloses a satellite navigation anti-spoofing method and system for multi-dimensional cooperative detection, and the method comprises the steps: completing the prediction and detection of satellite visibility based on the position and time information of a receiver in combination with a satellite almanac; calculating a satellite pseudo-range rate and comparing the satellite pseudo-range rate with a predicted value to realize pseudo-range rate detection; a double-star pseudo-range difference model is constructed, and detection is completed by observing the residual error of the pseudo-range difference and the theoretical pseudo-range difference; deriving a receiver clock drift value based on adjacent epoch pseudo-range data, and completing detection through clock drift change characteristics; and according to the four-dimensional detection result, cooperatively judging a deception signal, triggering an alarm and eliminating the signal. According to the scheme of the invention, through cooperative verification of a multi-dimensional detection mechanism, the problems of easy missing detection and weak anti-interference capability of a single detection method are solved, the method can be realized only by a single receiver, the compatibility is strong, the real-time performance is excellent, various types of deception signals can be effectively identified, and the navigation positioning precision is ensured.

The application discloses a kind of based on low-orbit giant constellation dynamic inter-satellite communication visibility calculation method, comprising the following steps: obtaining the latest TLE ephemeris data of two satellites under a certain constellation, based on TLE ephemeris data and specific epoch, the spatial position of two satellites is calculated using SGP4 orbit prediction model;Then the inter-satellite line-of-sight visibility between two satellites is calculated, and the result is characterized as a Boolean quantity;Utilize the optical power budget function based on inter-satellite laser link establishment, carry out received optical power budget;The azimuth and elevation of communication antenna under satellite body coordinate system are calculated;Finally, the visibility result of two satellites is calculated, the specific communication antenna number of satellite is determined, and the constellation inter-satellite visibility matrix is established.The application discloses a kind of based on low-orbit giant constellation dynamic inter-satellite communication visibility calculation method, constellation scale and calculation speed have higher flexibility and computing performance, inter-satellite visibility calculation is more in line with actual satellite communication scene.

This invention proposes a mobile phone shadow matching positioning method and system in complex urban environments. The method includes: extracting building boundaries and road area blocks, and calculating satellite SNR distribution characteristics; obtaining mobile phone GNSS observation data and broadcast ephemeris, smoothing the SNR using a low-pass filter, and obtaining the pedestrian's absolute position and satellite position; obtaining accelerometer, magnetometer, and gyroscope data, and obtaining the pedestrian's stride length and heading angle based on the observation data; generating an initial set of candidate positions based on the pedestrian's initial absolute position, and updating the candidate positions based on the pedestrian's stride length and heading angle; predicting satellite visibility characteristics based on satellite positions and building boundaries; scoring and weighting candidate positions based on SNR distribution characteristics, satellite visibility, altitude angle, azimuth angle, and the distance between the candidate positions and the pedestrian's absolute position, and determining the pedestrian's position using a weighted average method. This invention can significantly improve the dynamic positioning accuracy of shadow matching algorithms in complex urban environments.

The invention discloses a visibility prediction method for a low-orbit communication satellite, a terminal and a storage medium. The method comprises the following steps: initializing terminal parameters and target constellation parameters; acquiring ephemeris data of a corresponding satellite based on the target constellation parameter; calculating precession parameters of a satellite orbit in combination with the ephemeris data and the terminal parameters; distributing reference satellites for each orbit of the constellation according to the precession parameters; and predicting the visibility of all satellites of the constellation to the terminal based on the reference satellite and the terminal parameters. According to the method, the reference satellite represents the motion characteristics of the whole orbital plane, so that the calculation complexity of visibility prediction is remarkably reduced, and efficient and rapid prediction of the visibility of the low-orbit communication satellite is realized.

The present invention relates to a method and a device for checking the reliability of information on the location of a vehicle (11) obtained from a satellite geolocation system. To this end, first data on the location of the vehicle (11) are determined from signals received from satellites (111 to 114) and second data on the location of the vehicle (11) are determined from data received from sensors onboard the vehicle (11). A first level of vehicle location accuracy is determined by comparing the first data and the second data. The first level of accuracy is compared with a second level of location accuracy obtained from a satellite visibility map. The reliability of the second level of accuracy is determined on the basis of a result of comparing the first level of accuracy with the second level of accuracy.

The application discloses a three-dimensional map aided GNSS positioning method based on density clustering improvement, comprising the following steps: constructing a three-dimensional building model, generating a sky mask, pre-generating a sky mask database, judging satellite visibility, scoring the satellite visibility based on a shadow matching algorithm, optimizing candidate point screening rules, introducing an OPTICS clustering algorithm to sort, clean and select candidate points, and screening high-score points; taking the score of the high-score points as a weight, optimizing the calculation formula into a weighted average formula considering cluster weight, and calculating a final position. The positioning method can solve the problem of multiple adjacent peak candidate points in three-dimensional building model aided GNSS pseudorange single point positioning under similar geometric observation conditions in the vicinity of a city area in a complex urban environment, the OPTICS clustering algorithm is adopted to sort data points according to density, small clusters are removed, and effective cleaning and selection of candidate points are realized, so that the positioning precision is effectively improved.

The application discloses a multi-constellation multi-fault detection and elimination method and device and electronic equipment, and belongs to the technical field of satellite navigation and positioning. The method comprises the following steps: acquiring GNSS observation data and a fisheye image, performing semantic segmentation on the image to identify a sky area, and judging satellite visibility; constructing an Euclidean distance matrix, a geometric angle matrix and an inter-satellite pseudo-range difference matrix for each constellation; based on a triangular geometric relationship and a cosine theorem, a geometric distance from a reference star to a terminal is obtained by using median robust estimation, and a residual error matrix is constructed; a fault voting matrix is generated through K-means clustering, a fault satellite set is output, and positioning calculation is performed by using non-fault satellites. The application fuses visual semantic information and inter-satellite geometric constraints, does not need iterative search and a large amount of training data, realizes one-time multi-fault real-time detection and elimination in a complex urban environment, and has good generalization ability and robustness.

Techniques for satellite-based wireless communication (SBWC) satellite visibility determination based on global navigation satellite system (GNSS) satellite visibility are disclosed. The technique may include: identifying one or more visible GNSS satellites based on one or more received GNSS signals; estimating an orientation of a directional radio frequency (RF) antenna based on the respective expected positioning of the one or more visible GNSS satellites; determining whether any one of the plurality of SBWC satellites is visible based on the estimated orientation of the directional RF antenna; and initiating an SBWC communication process in response to determining that at least one SBWC satellite of the plurality of SBWC satellites is visible.

The present invention relates to a method and device for verifying the reliability of vehicle location information (11) obtained from a satellite geolocation system. To this end, first vehicle location data (11) from signals received from satellites (111 to 114) and second vehicle location data (11) from data received from sensors onboard the vehicle (11) are determined. A first level of vehicle location accuracy is determined by comparing the first and second data. This first level of accuracy is compared to a second level of location accuracy obtained from a satellite visibility map. The reliability of the second level of accuracy is determined based on the result of comparing the first level of accuracy to the second level of accuracy. (See Figure 1 for abbreviations.)

The invention discloses a space-based observation configuration optimization method and system based on GDOP optimization. The method comprises the steps that an observation satellite obtains observation information of a target; screening a satellite set capable of participating in observation; enumerating all main and auxiliary satellite combinations meeting task requirements; introducing reinforcement learning, and screening out candidate combinations with high potential; calculating the GDOP value of each candidate combination in parallel in real time; judging and switching the optimal combination; and recording all decision data, efficiency indexes and energy consumption states of the current combination as empirical data. The system comprises a target sensing module, a satellite visibility judgment module, a dynamic resource allocation evaluation module, a main and auxiliary satellite combination enumeration module, a reinforcement learning screening module, a GDOP real-time evaluation module, a configuration switching decision module and a data storage module. According to the invention, accurate real-time positioning can be realized under the condition of dynamic change of the target. The method can be widely applied to the fields of satellite navigation and target observation.

The invention provides an autonomous task planning method and device for satellite group collaborative observation of a space target. The method comprises the following steps: constructing a comprehensive constraint index based on acquired input parameters, and determining an observable constraint set of resources to targets and an observable target number of the resources based on the comprehensive constraint index; wherein the input parameters comprise a satellite working duration constraint set, a satellite minimum working duration constraint set and a target visibility identifier of the satellite; according to the observable constraint set of the resources to the targets and a preset optimization target, calculating a revenue coefficient of each satellite for observing each target; wherein the preset optimization target comprises load balancing, resource redundancy, tracking duration, earliest tracking time and resource switching times; and on the basis of the income coefficient and the observable target number of the resources, sequentially searching an optimal resource planning scheme under different observation target numbers by using a heuristic algorithm. According to the scheme, on-satellite real-time rapid optimal solution can be realized.

A multifunctional PPS pulse-per-second signal generator based on an SoC relates to the technical field of satellite timing. It addresses the existing problem that actual satellite signals are limited by factors such as satellite visibility, signal strength, and environmental interference, resulting in inevitable errors during testing and verification. The timing process is not intuitive and flexible, and compared to the SoC core, other main control cores have fewer resources, making it unable to cope with various timing situations and different devices requiring timing. The present invention includes a power supply circuit, an SoC main control circuit, an RS422 bus transmission circuit, a CAN bus transmission circuit, an OLED display circuit, a key circuit, a bidirectional voltage conversion circuit, a DIP switch, and wiring terminals. The present invention simulates satellite signals to generate pulse signals and time information, uses RS422 and CAN bus data transmission, and improves the signal generator's anti-interference capability.

This application discloses a method, apparatus, and medium for executing extended discontinuous reception parameters for network verification, relating to the field of communication technology. A terminal device acquires satellite ephemeris data, its own geographical location, and service characteristic information; calculates the satellite visibility time window sequence and orbit revisit period; determines the target extended discontinuous reception configuration parameters; and sends a non-access stratum request message carrying the geographical location, target parameters, and satellite orbit identifier. The core network acquires corresponding satellite constellation coverage planning data, performs orbit matching verification and validity judgment on the request parameters, and generates a feedback adjustment confirmation message. The terminal executes the extended discontinuous reception operation based on the effective parameters in the confirmation message. This application achieves parameter adaptation to satellite orbits and service characteristics, improves parameter validity, reduces terminal power consumption, and ensures communication reliability.

A system, apparatus and method for mapping and navigating within a cavity lacking continuous satellite visibility, the system comprising: a scanning device configured to generate a spatial model of the cavity using a simultaneous localization and mapping (SLAM) module; a localization module configured to obtain absolute position information when available; an inertial measurement unit (IMU) for providing data of motions taken by a user using the system; at least one processor configured to: receive the absolute position information from the localization module; receive the spatial model generated by the SLAM module; associate relative SLAM coordinates of the scanning device with the absolute position information; update locations within the spatial model based on the motion data; and a wearable device comprising a display device, the display device adapted to display a presentation of at least a part of the spatial model or a map of the cavity.

The invention provides a satellite visibility judgment method and device, equipment, a storage medium and a program product, and relates to the technical field of satellite positioning, and the method comprises the steps: selecting a plurality of pieces of target satellite position data of which epoch time is located in a first time period from a plurality of pieces of satellite position data of a first satellite position data set; wherein the first time period is determined according to the user time; each piece of satellite position data comprises a satellite identifier, epoch time and a satellite position; according to the polynomial order, performing data interpolation processing on the multiple pieces of target satellite position data to obtain a second satellite position data set; wherein the polynomial order is related to the complexity of the position data of the multiple target satellites; and according to the satellite visibility prediction model, the user position and the satellite position corresponding to the user time in the second satellite position data set, a satellite visibility judgment result corresponding to the user time is obtained, and by adopting the scheme of the invention, the accuracy of satellite visibility judgment can be improved.

A method and apparatus for acquisition preprocessing includes: estimating and determining the visible satellites of the navigation receiver within a preset time period based on satellite visibility association information of the navigation receiver; and performing acquisition processing based on the estimated visible satellites of the navigation receiver within the preset time period. Embodiments of the present invention reduce the number of satellites searched during cold start, shorten the initial positioning time during cold start, and improve the acquisition efficiency of the navigation receiver.

The present application relates to the field of satellite communication, and more particularly to a satellite visible time window calculation method based on visible areas, which constructs an accurate 3D terrain model through real-time volume rendering and multi-level dynamic modeling techniques; then, uses a high-performance ray tracing algorithm and an adaptive precision adjustment mechanism to calculate visible area data; then, combines machine learning algorithms and multi-factor dynamic correction methods to generate corrected predicted orbit data; then, uses a multi-objective optimization algorithm to integrate data and calculate the optimal satellite visible time window; finally, through real-time monitoring and feedback adjustment of the multi-satellite coordination mechanism and dynamic switching strategy, efficient and stable satellite switching is ensured; the present application significantly improves the calculation accuracy and efficiency, optimizes resource allocation, and enhances the stability and user experience of the system.

The application discloses a kind of methods for calculating city space beidou satellite visibility using virtual panoramic occlusion map, first, generate high-precision digital surface model based on point cloud;Second, calculate the initial area of high-precision digital surface model of virtual panoramic occlusion map, by constantly iterating, adaptively select the range of high-precision digital surface model used when constructing virtual panoramic occlusion map at any position in city three-dimensional space, according to the calculation of azimuth and elevation, the cylindrical virtual panoramic occlusion map is converted into hemispherical virtual panoramic occlusion map, then the map is projected into plane circumferential virtual panoramic occlusion map;Finally, according to the plane relationship diagram of plane circumferential virtual panoramic occlusion map and beidou satellite sky map, judge beidou satellite visibility.The present application improves the accuracy and resolution of existing city digital surface model;Reduce data operation amount, improve operation efficiency, improve the efficiency and accuracy of city three-dimensional space beidou satellite visibility calculation.

The invention relates to a method for predicting the hot start success rate of a receiver, and belongs to the field of satellite navigation. According to the method, parameters t1 and P1 preset by a user are accessed, a Beidou satellite orbit drifting model and a regional satellite visibility algorithm are combined, the hot start success rate at the moment t1-P1 is accurately predicted, a result is fed back to a receiver user in real time, the user can judge whether to readd an ephemeris when P1 is approached according to the result in advance, and the accuracy of the receiver is improved. Positioning delay caused by blind starting is avoided, and finally the use efficiency of the Beidou receiver in a dynamic scene is improved.

The invention relates to the technical field of satellite trajectory calculation, and discloses real-time satellite visibility deception detection based on satellite trajectory estimation, which comprises the following steps of: calculating a visible satellite list at the position and time through a satellite trajectory model according to the geographic position and the current time of a receiver; detecting and analyzing the received satellite signal, and judging whether the satellite signal belongs to a visible satellite list or not; and analyzing and judging whether the received satellite signal is real or not based on the historical satellite data and the analyzed satellite signal. By adopting an advanced signal analysis technology and a machine learning algorithm, normal signals and forged signals can be quickly identified and distinguished, and the method is particularly excellent in performance in complex and dynamic environments. In addition, the detection method based on real-time satellite trajectory estimation enables the system to respond to potential threats in time, and the overall safety is improved.

The application provides a satellite visibility simulation method and device, wherein the satellite visibility simulation method comprises the following steps: generating a simulation time point set according to a preset simulation time length and a preset simulation step; grouping a to-be-simulated ground station and a to-be-simulated satellite based on a set grouping strategy, and constructing at least two simulation object groups, wherein the at least two simulation object groups perform visibility simulation in parallel, each simulation object group comprises at least one to-be-simulated ground station and at least one to-be-simulated satellite; selecting a target satellite and a target ground station from a target simulation object group, performing visibility simulation on the target satellite and the target ground station based on the simulation time point set, and determining a visibility simulation result of the target satellite for the target ground station. In this way, the grouping strategy can be customized, the to-be-simulated ground station and the to-be-simulated satellite are grouped, parallel processing is adopted, computer resources are maximally utilized, and the efficiency of the visibility simulation is greatly improved.

This application relates to a positioning method, apparatus, computer device, storage medium, and program product. The method can be applied to map navigation, map building, autonomous driving, or smart mobility scenarios. The method includes: determining the target location from candidate locations corresponding to the area where the target device is located at the current epoch based on satellite visibility; calculating the double-difference pseudorange and double-difference frequency shift at the current epoch based on the target's visible satellites observed jointly by the target location and a reference base station at the current epoch; adding a trailing variable node to the factor map optimized in the previous epoch based on the double-difference pseudorange and double-difference frequency shift at the current epoch to obtain the factor map corresponding to the current epoch; adjusting the factor map corresponding to the current epoch with the goal of maximizing the posterior probability of the factor map corresponding to the current epoch to obtain the optimized factor map for the current epoch; and generating the positioning information of the target device at the current epoch based on the trailing variable nodes in the optimized factor map for the current epoch. This method can improve positioning accuracy.

The present invention relates to a method and device for controlling the movement of an automated vehicle (10) in a road environment (1). To this end, first data representing a satellite visibility map associated with the road environment (1) are received. Second data representing a path to be followed by the automated vehicle (10) in the road environment (1) are received. Third data representing a route for the automated vehicle (10) is determined based on the first and second data. The movement of the automated vehicle (10) is controlled based on the third data. Figure 1 (for the abstract)

This application relates to a method, apparatus, and equipment for satellite telemetry, tracking, and command (TT&C) mission scheduling based on hierarchical optimization. The method includes: establishing a unified model of a set of resource demand objects, a set of equipment capability objects, and a set of satellite visibility forecasts for equipment in medium- and high-orbit orbits (MEO) satellites, based on resource usage requests; preprocessing and decoupling the demand object sets to generate new demand object sets for each scheduling layer; sequentially calling designed sub-scheduling layers for hierarchical resource scheduling based on the new demand object sets, equipment capability object sets, and visibility forecast sets to generate an initial solution set for hierarchical scheduling; calling a designed optimized scheduling layer to reconstruct and optimize the initial solution set based on the demand object sets, generating an optimized solution set for hierarchical scheduling; the optimized solution set for hierarchical scheduling is used to indicate the resource scheduling result for MEO satellites corresponding to the resource usage request. This significantly improves the scheduling efficiency of routine TT&C missions for MEO satellites.

The application discloses a kind of through TLE data determination satellite and satellite visible time period calculation method, it is related to satellite communication and inter-satellite link management technical field, in low-orbit constellation networking scene, the application is generated by the joint analysis of orbit inclination difference and BSTAR parameter, scaling factor evolving with time, real-time correction communication distance threshold, inhibit error transmission along the direction of trajectory;Introduce the dynamic tolerance model of relative motion state perception, make the window search process automatically refine step in the high-speed approach phase of satellite, accurately capture millisecond-level visible interval, while avoiding missing detection in high dynamic relative motion;In addition, for the visible state boundary jitter problem, adopt the stabilization output strategy of hysteresis filtering and double threshold linkage;By linear mapping dynamic tolerance to hysteresis bias, form the adaptive buffer zone of entry / exit threshold, ensure that short distance fluctuation does not trigger state jump, output continuous complete visible time period.

The application provides a kind of constellation cooperative observation space target autonomous task planning method and device.Method includes: based on the input parameter of acquisition, construct comprehensive constraint index, and based on the comprehensive constraint index, determine the observable constraint set of target of resource to target and the observable target number of resource;Wherein, the input parameter includes satellite workable time constraint set, satellite minimum work time constraint set and satellite visibility identification to target;According to the observable constraint set of target of resource to target and preset optimization target, the benefit coefficient of each satellite observation each target is calculated respectively;Wherein, the preset optimization target includes load balancing, resource redundancy, tracking time, earliest tracking time, resource switching frequency;Based on the benefit coefficient and the observable target number of resource, the optimal resource planning scheme under different observation target number is searched in turn using heuristic algorithm.This scheme can realize real-time fast optimal solution on satellite.

The embodiment of the present application discloses a regional short message encoding method and a positioning method based on regional short messages, which relate to the field of GNSS navigation and positioning technology. The encoding method includes: calculating the spatial signal ranging error correction number of each satellite based on the initial position of the user terminal; determining the deviation change of the pseudorange observation value of each satellite; obtaining the phase observation value deviation of each satellite; determining the broadcast satellite; encoding the spatial signal ranging error correction number, pseudorange observation value deviation change and phase observation value deviation of the broadcast satellite into a regional short message. The present application increases the number of satellites broadcasting short messages by more effectively utilizing the data length of the regional short message, reduces the accuracy loss caused by encoding, and improves positioning accuracy and convergence speed. Under the premise that satellite visibility, spatial signal ranging error, pseudorange and phase deviation are all within the valid range, multiple visible satellites are selected for encoding and broadcasting, which effectively improves positioning accuracy.

The invention provides a satellite visibility analysis method and device for a carrier, and relates to the technical field of satellite communication.The satellite visibility analysis method for the carrier comprises the steps that real-time environment data, the real-time pose of the carrier and the satellite position within a preset range are obtained, and the real-time environment data comprise a continuous terrain model and a building white model; generating a detection ray according to the real-time pose of the carrier and the satellite position; determining a building shielding result according to a space intersection relationship between the detection ray and a building white pattern on the continuous terrain model; according to the real-time poses of the detection rays and the carrier, the self-shielding result of the carrier is determined through the projection overlapping relation; and generating a satellite visibility analysis result of the carrier according to the building shielding result and the carrier self-shielding result. According to the method, the accuracy of satellite visibility evaluation can be effectively improved.