34 results about "Satellite visibility" patented technology

A method and system for creating a sky visibility map, using data from a vehicle and its neighbors. A host vehicle with satellite-based navigation capability measures the quality of signals it receives from available satellites, where azimuth and elevation angles of the satellites are known from an ephemeris or almanac. The host vehicle also receives satellite signal data from surrounding vehicles via vehicle-to-vehicle communication. Using data from all of the vehicles, a sky visibility map is constructed, indicating where obstructions to satellite visibility exist for different locations. The sky visibility map is used to anticipate satellite signal quality. A driving environment classification can be used to configure other vehicle systems. The sky visibility map can also be constructed without using data from surrounding vehicles; the host vehicle can store its satellite signal data long-term and use it to estimate satellite visibility when returning to a location previously visited.

The invention discloses a satellite visibility analysis method considering satellite occlusion conditions, comprising the following steps: S1, measuring the occlusion elevation angle Ei of a satellite at a target point; S2, calculating the spatial position of the satellite and carrying out coordinate transformation; and S3, in a station center coordinate system with a ground survey station R as the origin, calculating out the instantaneous elevation angle e and azimuth angle A of the satellite; calculating the occlusion elevation angle Ei at corresponding time and at corresponding azimuth A; comparing the elevation angle e of the satellite with the occlusion elevation angle Ei at the corresponding time and at the corresponding azimuth; if e<=Ei, judging that the satellite is not visible, and removing the satellite; if e>Ei, judging that the satellite is visible, and keeping the satellite; and filtering satellites according to the method, and obtaining an accurate satellite visibility result. The precision factor of a single survey station is evaluated according to the satellite visibility analysis result, and thus, ephemeris prediction is realized. The method of the invention is suitable for carrying out ephemeris prediction of GNSS observation in alpine and gorge regions and in regions difficult to observe under the effect of city buildings. The problem that the traditional ephemeris prediction result is inconsistent with the actual observation conditions is solved.

The invention provides an analysis method of constellation compatibility and interoperability of navigation satellites and relates to a definition and analysis method for the constellation compatibility and the interoperability of the navigation satellites. The compatibility is analyzed mainly from two aspects of long-term evolution and collision probability. Shot effects and long-term evolution rules of satellites on the medium orbit are given and a calculation method of the collision probability is provided. The interoperability is analyzed mainly from aspects of satellite visibility, position precision factors and positioning service availability, and calculation methods and effect factors of the satellite visibility, the position precision factors and the positioning service availability are provided respectively. According to the invention, the provided definitions of the constellation compatibility and the interoperability are different from definitions of common signal, time and coordinate compatibility and interoperability, and the provided analysis method is highly realizable in engineering.

The invention relates to a method and a device for judging satellite visibility under carrier rotating condition. The method mainly includes: building a carrier coordinate system, calculating carrier rotating angles, and calculating satellite positions in the carrier coordinate system according to the carrier rotating angles; and calculating satellite elevation angles according to the satellite positions in the carrier coordinate system, comparing the satellite elevation angles and satellite screening angles, and judging satellite visibility according to comparison results. In an embodiment of the method and the device, the carrier coordinate system is built, positions of satellites in a horizontal coordinate system are shifted into the carrier coordinate system and the satellite elevation angles are calculated, and accordingly the satellite visibility can be effectively judged according to the satellite elevation angles under carrier rotating condition.

The invention discloses a satellite visibility analysis method for Beidou differential reference station layout. The method is used for calculating the satellite visibility of a reference station at some moment through DEM (Digital Elevation Model) data and almanac data. The method comprises the steps: (1) calculating the azimuth angle alpha and altitude angle beta of a satellite; (2) calculating the coordinates P of a point of intersection between the direction from the reference station to the satellite and a DEM valid data boundary; (3) calculating the coordinates of a barrier point; (4) calculating the altitude angle of the barrier point; (5) judging satellite visibility. By the method, on-graph previewing work can be carried out on reference station layout, and the method has the advantages of simplicity and practicability.

The present invention provides a method for carrying out positioning in-orbit test authentication based on a navigation satellite leakage signal. Firstly, an in-orbit test flight height is determined, the relative position relation among a detector, a navigation satellite and the Earth is calculated, the angle of an any position relative to Earth vector and detector vector of the navigation satellite is calculated according to the position relation of the detector, the navigation satellite and the Earth, and the visibility of the navigation satellite is judged. According to the navigation satellite visibility judgment result, the height range of boot working and boot time of a satellite-borne navigation receiver are determined, according to the navigation visibility judgment result, an in-orbit flight attitude is analyzed, and the wave beam angle range of a GNSS navigation receiving equipment receiving antenna is determined. The receiving condition of the navigation leakage signal and a navigation positioning result are recorded in an orbit test. The receiving ability of the navigation leakage signal of the GNSS navigation receiver and the influence on the navigation performance are compared and analyzed. The problems of the comprehensive functional performance testing of the navigation satellite leakage signal receiving equipment of deep-space exploration and high-Earth orbit satellite navigation satellites and the system design of positioning by using the navigation satellite leakage signal are solved.

The invention discloses a satellite search method and a receiver. The satellite search method comprises steps: a spatio-temporal lattice collection and satellite visibility corresponding to the spatio-temporal lattice collection are determined; according to confidence of each spatio-temporal lattice in the spatio-temporal lattice collection where the receiver is located and the satellite visibility, a search optimization level of a to-be-searched satellite is determined; and the satellite is searched according to the search optimization level of the to-be-searched satellite. According to the satellite search method and the receiver, the search sequence of the satellite can be determined according to the confidence and the satellite visibility, the hit rate of capture is improved, and the satellite search efficiency is further improved.

The invention discloses an urban canyon positioning method based on GNSS / vision / Lidar fusion. The method comprises the following steps: 1, judging satellite visibility through a fisheye camera; 2, further judging a satellite signal type based on a supervised learning mode; 3, determining the weight of a satellite, and carrying out multi-constellation positioning calculation based on the weight of the satellite to obtain an initial positioning solution; 4, correcting the initial positioning solution, and generating a candidate position; 5, screening the candidate position and calculating the weight of the candidate position according to the conformity degree of the satellite visibility of the candidate position and the recognized visible satellite in the step 1; and 6, calculating based on the candidate position weight to obtain a final positioning result. According to the method, the precision of the cross-street direction and the along-street direction in urban canyon GNSS positioning is effectively improved, and better real-time performance and convenience are achieved.

The invention provides a vehicle localization integrity monitoring method based on wireless information interaction. The method includes that a vehicle receives and analyzes observation information of a navigational satellite through a satellite positioning receiver, an adjacent vehicle state information packet of vehicle networking is received and analyzed through a dedicated short range communication (DSRC) transmission unit that is carried by the vehicle, overall PL of the vehicle are determined according to the navigational satellite observation information and the adjacent vehicle state information packet, integrity state is evaluated according to the overall PL and AL of vehicle networking of the vehicle, and an adjusting scheme of a positioning structure of the vehicle is determined according to an evaluated result of the integrity state. A moving adjacent vehicle node is used as a reference target, observation information of automatic integrity monitoring that is implemented by the vehicle-mounted satellite positioning receiver is extended, and thereby, requirements of integrity monitoring for satellite visibility conditions can be lowered.

The invention relates to a method and a device for judging satellite visibility under carrier rotating condition. The method mainly includes: building a carrier coordinate system, calculating carrier rotating angles, and calculating satellite positions in the carrier coordinate system according to the carrier rotating angles; and calculating satellite elevation angles according to the satellite positions in the carrier coordinate system, comparing the satellite elevation angles and satellite screening angles, and judging satellite visibility according to comparison results. In an embodiment of the method and the device, the carrier coordinate system is built, positions of satellites in a horizontal coordinate system are shifted into the carrier coordinate system and the satellite elevation angles are calculated, and accordingly the satellite visibility can be effectively judged according to the satellite elevation angles under carrier rotating condition.

Embodiments of the present invention provide a link flooding attack protection method and device, wherein the method includes: obtaining each traffic transmission requirement of the satellite network, the inter-satellite visibility relationship between each satellite in the satellite network, and the The number of beams; based on the inter-satellite visibility relationship between the satellites and the number of beams of each satellite, determine several candidate transmission paths corresponding to each traffic transmission requirement; based on the respective traffic transmission requirements and their corresponding For several candidate transmission paths, determine the final transmission paths corresponding to the respective traffic transmission requirements and perform traffic allocation. The method and device provided by the embodiments of the present invention realize the balanced distribution of network traffic in the satellite network and ensure normal communication between the target area and the external network.

The invention discloses a quite-weak GNSS signal receiving high-orbit-satellite orbit positioning method. By means of the method, a GNSS ephemeris and celestial navigation information are used, the GNSS satellite visibility is analyzed, and a GNSS signal Doppler frequency range is estimated; the technology that an 8*20-ms coherent integration time matched filer is combined with a navigation message for estimation is used, influences of overturning of the navigation message are avoided, data of the navigation message can be correctly obtained, the problem that a coherent integration value is attenuated due to the code Doppler effect is solved, and open-loop-structure quite-weak GNSS signals with the signal intensity as low as -158 dBm can be accurately captured. Meanwhile, ionized layer delay is compensated, the super-long pseudo-range ambiguity is constructed, and accurate orbit positioning of a high-orbit satellite is achieved. The super-long coherent integration time is used, the signals can be intermittently and accurately captured, the weak signal capturing sensitivity is greatly improved, and the energy losses are reduced.

The invention discloses a positioning method, a positioning device and a computer readable storage medium, and relates to the field of wireless communication. The positioning method comprises the following steps of determining a satellite coverage function according to a reference station variable and the number of base stations to be selected, wherein the reference station variable represents whether the base station to be selected is used as a reference station or not; according to the reference station variable, and the time period during which a satellite can be observed by each base station to be selected, determining a satellite visibility function; determining an optimized objective function according to the satellite coverage function and the satellite visibility function; and determining the to-be-selected base station serving as a reference station when the optimized objective function value is the maximum, so as to carry out positioning according to the determined referencestation. Therefore, modification and upgrading can be carried out on the basis of an existing base station, so that the positioning function is achieved, and the positioning precision is improved on the basis that the station distribution cost is reduced as much as possible.

The method of the present invention proposes an on-orbit test verification method for positioning based on navigation satellite leakage signals. First, determine the flight height of the on-orbit test, calculate the relative positional relationship between the detector, the navigation satellite and the earth, and calculate the relative position of any position according to the positional relationship among the three. The angle between the earth vector of the navigation satellite and the detector vector is used to judge the visibility of the navigation satellite; according to the judgment result of the navigation satellite visibility, determine the altitude range and the startup time of the spaceborne navigation receiver, and according to the judgment result of the navigation visibility , analyze the flight attitude on orbit, and determine the beam angle range of the receiving antenna of the GNSS navigation receiving equipment; on-orbit test records the reception of navigation leakage signals and navigation positioning results; compare and analyze the receiving ability of GNSS receiver navigation leakage signals and its performance on navigation The method of the present invention solves the comprehensive functional performance test of the navigation satellite leakage signal receiving equipment of deep space exploration and high-orbit earth satellites and the system design problem of using the navigation satellite leakage signal for positioning.

The invention discloses a satellite search method and a receiver. The satellite search method comprises steps: a spatio-temporal lattice collection and satellite visibility corresponding to the spatio-temporal lattice collection are determined; according to confidence of each spatio-temporal lattice in the spatio-temporal lattice collection where the receiver is located and the satellite visibility, a search optimization level of a to-be-searched satellite is determined; and the satellite is searched according to the search optimization level of the to-be-searched satellite. According to the satellite search method and the receiver, the search sequence of the satellite can be determined according to the confidence and the satellite visibility, the hit rate of capture is improved, and the satellite search efficiency is further improved.

The invention discloses a satellite visibility analysis method considering satellite occlusion conditions, comprising the following steps: S1, measuring the occlusion elevation angle Ei of a satellite at a target point; S2, calculating the spatial position of the satellite and carrying out coordinate transformation; and S3, in a station center coordinate system with a ground survey station R as the origin, calculating out the instantaneous elevation angle e and azimuth angle A of the satellite; calculating the occlusion elevation angle Ei at corresponding time and at corresponding azimuth A; comparing the elevation angle e of the satellite with the occlusion elevation angle Ei at the corresponding time and at the corresponding azimuth; if e<=Ei, judging that the satellite is not visible, and removing the satellite; if e>Ei, judging that the satellite is visible, and keeping the satellite; and filtering satellites according to the method, and obtaining an accurate satellite visibility result. The precision factor of a single survey station is evaluated according to the satellite visibility analysis result, and thus, ephemeris prediction is realized. The method of the invention is suitable for carrying out ephemeris prediction of GNSS observation in alpine and gorge regions and in regions difficult to observe under the effect of city buildings. The problem that the traditional ephemeris prediction result is inconsistent with the actual observation conditions is solved.

The invention discloses a positioning method, a positioning device and a computer-readable storage medium, and relates to the field of wireless communication. The positioning method includes: determining a satellite coverage function according to a reference station variable and the number of base stations to be selected, wherein the reference station variable indicates whether the base station to be selected is used as a reference station; satellites can be observed according to the variable of the reference station and each base station to be selected Determine the satellite visibility function; determine the optimization objective function according to the satellite coverage function and the satellite visibility function; determine the base station to be selected as the reference station when the optimization objective function value is the largest, so as to perform positioning according to the determined reference station . Therefore, the existing base station can be transformed and upgraded to have the positioning function, and the positioning accuracy can be improved on the basis of reducing the cost of station deployment as much as possible.

The invention provides an analysis method of constellation compatibility and interoperability of navigation satellites and relates to a definition and analysis method for the constellation compatibility and the interoperability of the navigation satellites. The compatibility is analyzed mainly from two aspects of long-term evolution and collision probability. Shot effects and long-term evolution rules of satellites on the medium orbit are given and a calculation method of the collision probability is provided. The interoperability is analyzed mainly from aspects of satellite visibility, position precision factors and positioning service availability, and calculation methods and effect factors of the satellite visibility, the position precision factors and the positioning service availability are provided respectively. According to the invention, the provided definitions of the constellation compatibility and the interoperability are different from definitions of common signal, time and coordinate compatibility and interoperability, and the provided analysis method is highly realizable in engineering.