8 results about "Geocentric coordinates" patented technology

The embodiment of the application provides a kind of distributed high-precision phased array measurement radar beam scheduling method and beam scheduling system, belong to radar beam scheduling technical field.The scheduling method includes: obtaining the antenna azimuth angle pitch information of each substation and radar site information, to obtain the conversion matrix of geocentric coordinate, station heart coordinate conversion matrix and array surface coordinate conversion matrix;Obtain the scheduling request of main station TRK;The main station target RAE coordinate of the scheduling request is converted into array surface coordinate according to the array surface coordinate conversion matrix;The main station target RAE coordinate is converted into geocentric coordinate according to the geocentric coordinate conversion matrix;The geocentric coordinate is sent to each substation for observation;Obtain each the feedback observation information of the substation, and integrate each the observation information according to time sequence signal, to obtain the observation data of target.The application solves the problem of each radar receiving time sequence synchronization and target position unification under multiple stations, ensures the consistency of data between different radar stations.

This invention discloses a method for detecting the azimuth and elevation angles of a low-Earth orbit (LEO) satellite transit, belonging to the field of satellite communication technology. The method includes the following steps: obtaining the satellite coordinates and communication time differences for three consecutive two-way communications between a ground terminal and a LEO satellite; calculating the distance between the ground terminal and the satellite at the three communication times based on the communication time differences; calculating the ground terminal coordinates in the geocentric coordinate system based on the satellite coordinates and the calculated three distances at the three communication times; and calculating the elevation and azimuth angles of the satellite relative to the ground terminal using a vector method based on the satellite coordinates and ground terminal coordinates at the time of the last communication.

The application discloses a data processing method, device and equipment, and relates to the technical field of data processing, to solve the problem that the existing POI data collection mode needs manual participation and cannot obtain the center point coordinates and contour information of POIs. The method comprises the following steps: acquiring dot matrix data of a target point of interest (POI); converting each point cloud coordinate in the dot matrix data into a geocentric coordinate system coordinate; determining a planar area mapped by the geocentric coordinate system coordinate of the dot matrix data; determining the contour information of the target POI according to the position distribution of the dot matrix data in the planar area, and determining the center point coordinate of the planar area as the center point coordinate of the target POI. The application can achieve the technical effect of obtaining the center point coordinate and the contour information of the target POI without manual participation.

The application provides an accurate calculation method, device and equipment for ISAR imaging rotation angle. The method comprises the following steps: obtaining first coordinate information of a target in a radar large earth coordinate system; converting the first coordinate information into a geocentric coordinate system to obtain third coordinate information; calculating a first included angle and a second included angle by using the third coordinate information in the geocentric coordinate system; and calculating the ISAR imaging rotation angle by using the first included angle and the second included angle. In the application, the spatial relationship among the geocenter, the ground-based radar and the target is coupled and calculated through the conversion among the coordinate systems, so that the correlation between the rotation angle value and the target orbit radius is generated, the limitations brought by the two-by-two spatial calculation model (radar-satellite, geocenter-satellite) of the traditional method are avoided, the accuracy of the imaging rotation angle calculation is improved, and finally the application efficiency of the ISAR technology in the medium-high orbit long-distance observation scene is improved.

This invention discloses a train positioning method based on the fusion of 5G and electronic track maps in a railway 5G-R scenario. The method includes: transforming the track point set in the electronic track map from a geodetic coordinate system to a geocentric coordinate system to obtain a trajectory continuity function; determining the Time of Arrival (TOA) for each base station based on downlink PRS signals transmitted by multiple 5G base stations and a pre-configured local reference PRS signal; obtaining distance difference observations based on the Time Difference of Arrival (TDOA) between TOAs; estimating the Angle of Arrival (AOA) observation based on uplink SRS signals; constructing an objective function for TDOA based on the trajectory continuity function and the distance difference observation, and pruning the feasible solution region using the AOA observation; and solving the objective function within the pruned feasible solution region using a coarse search and locally bounded optimization algorithm to obtain a train position estimate. This invention can still obtain stable and accurate positioning results even when there are insufficient available positioning base stations.

The application discloses a kind of identification and positioning method and device of aerial visual angle blind area target, belong to computer vision and remote sensing field.The method includes: obtaining the multisensor data of laser radar, camera, IMU and GNSS;Laser radar point cloud is converted to local horizontal coordinate system, and the region with elevation mutation feature is identified as blind area detection candidate area;The specific type and pixel range of aerial visual angle blind area target are identified;The point cloud data corresponding to target mask is extracted, combined with the pose and coordinate information of unmanned aerial vehicle, the three-dimensional coordinates of target under geocentric coordinate system are solved, and the center position is calculated to realize accurate positioning.The technical route of the application is coarse positioning by laser radar point cloud detection candidate area, accurate identification by image semantic segmentation, coordinate mapping solution, solves the problem that existing technology cannot be efficiently identified and positioned, and the accuracy is low, realizes the type identification and high-precision positioning of aerial visual angle blind area target.

This invention relates to a positioning calculation method, equipment, and medium based on BeiDou-3 satellites, belonging to the field of satellite positioning technology. The method includes the following steps: obtaining the geocentric coordinates of the BeiDou-3 satellites, the precise coordinates of the reference station, the approximate coordinates of the rover station, and the pseudorange and carrier phase observations of both relative to the satellites; inputting the geocentric coordinates and the coordinates of the reference and rover stations into a common-view satellite selection algorithm to obtain a common-view satellite set and select a reference satellite; calculating the double-difference pseudorange and double-difference carrier phase observations relative to the reference satellite using the observations from the reference and rover stations, and constructing a linearized observation equation; performing least-squares estimation using a weighted matrix to obtain the floating-point solution and its covariance matrix, and combining this with the approximate rover station coordinates to obtain the fixed solution rover station coordinates. This invention solves the problem of decreased positioning accuracy caused by the difficulty in completely eliminating tropospheric delay in complex environments such as long baselines and urban canyons by introducing double-difference tropospheric residual correction.

This invention discloses a three-dimensional spatial discrete coding method and system based on cubic spherical topology, relating to the fields of geospatial information processing and three-dimensional discrete grid technology. It addresses the problems of high-latitude distortion, poor elevation dimension fusion, and low computational efficiency across scales and surfaces in existing coding systems. This invention establishes a geocentric coordinate system and an Earth reference ellipsoid model, transforming and separating the spherical position and elevation components of the target point. After cubic mapping, nonlinear tangent transformation, fixed-point quantization, and three-dimensional Morton interleaving, it combines dynamic sentinel positions to form a 64-bit unsigned integer code, which can be quickly deconstructed and hierarchically analyzed using tail-zero counting. This invention effectively avoids high-latitude projection distortion, achieves native three-dimensional spatial fusion, supports cross-scale recursive addressing and O(1) complexity cross-surface neighborhood resolution, and is suitable for the efficient organization and retrieval of global three-dimensional spatial data.