12 results about "LattisNet" patented technology

This invention discloses a method and apparatus for processing the displacement of point-based Point of Interest (POI) features based on enhanced Morton codes. The method includes: calculating a data region, constructing a quadtree, and encoding the quadtree using Morton codes; decoding the Morton codes to obtain the rows and columns of the grid corresponding to each node in the entire quadtree grid matrix; for each node's corresponding grid, calculating the center point position of the grid using the node's depth and the Morton code through Morton decoding; shifting the geographic target obtained through a single-selection method to the center point position of the grid; when the shift distance exceeds a user-set error threshold, increasing the Morton code length by constructing a virtual sub-grid; and correcting the base map after the shift operation using a base map deformation technique. This invention solves the practical problems of point-based POI data display in the Internet environment, such as mutual overlap and unclear expression of thematic information.

The application discloses a response method and device for differential enhanced service request, equipment and storage medium, the method comprises the following steps: obtaining the differential enhanced service request sent by a service requester; determining the grid range type corresponding to the differential enhanced service request according to the grid coding in the differential enhanced service request; determining the differential correction data in the corresponding grid range and the broadcast frequency of the differential correction data according to the grid range type; sending the generated differential correction data to the service requester according to the determined broadcast frequency; by implementing the application, the differentiated needs of different service requesters for correction data can be met.

This application belongs to the field of digital twin basic data management technology. This application provides an automated method and apparatus for generating spatial identity codes for basic geographic entities. The embodiments of this disclosure acquire the geometric and classification information of basic geographic entities under a unified spatiotemporal reference, automatically calculate the minimum bounding rectangle / minimum outer cube, adaptively select the minimum grid level that can contain the geometric range, and generate two-dimensional or three-dimensional location codes level by level according to the BeiDou grid location code rules. These are combined with classification codes and sequence codes to form a standard field; then, a proprietary identification field is formed by combining this field with root identifier codes and special codes, and extended fields are added as needed to achieve interaction with external codes. This can realize the automated generation, verification, parsing, and traceability of spatial identity codes in scenarios such as provincial, municipal, and county collaborative production updates, two-dimensional / three-dimensional integrated database construction, semantic association, and service publishing, providing unified support for the data organization and management of basic geographic entities and cross-industry interconnection.

The application provides a navigation enhancement information transmission method, device and system, and the method comprises the following steps: a server receives a navigation enhancement original message; the server determines navigation enhancement information messages of visible satellites in each grid in real time according to the navigation enhancement original message; the server determines a grid in which a terminal is located according to the position information of the terminal in response to a navigation information enhancement service request of the terminal; and the server sends the navigation enhancement information messages of the visible satellites in the grid in which the terminal is located to the terminal through a ground network and a low-orbit satellite. Through the above scheme, the terminal is grouped based on the grid, so that the purpose of grouping by area can be achieved, the navigation enhancement information messages can quickly reach the terminal, the technical problem of low transmission efficiency of navigation enhancement information in the existing navigation enhancement technology is solved, and the technical effect of quickly and accurately transmitting the navigation enhancement messages is achieved, so that the reliability of terminal positioning is improved.

This invention discloses a grid atmospheric modeling and PPP-RTK positioning method and system applicable to BeiDou PPP-B2b service. The server combines broadcast ephemeris data with PPP-B2b corrections, and generates high-precision satellite orbit clock errors through benchmark unification processing. A non-differential, non-combined model that takes into account specific satellite clock error deviations is constructed using regional reference station network data to estimate the uncorrected phase delay compatible with these deviations. Based on this delay and orbit clock errors, ambiguity is fixed stepwise, regional ionospheric and tropospheric delays are extracted, and a grid atmospheric enhancement product is generated through a two-layer modeling strategy of fitting and adding residuals. The phase delay and atmospheric product are broadcast to the user terminal. Upon receiving the data, the user terminal recovers the atmospheric corrections, incorporates them as constraints into the observation equations, and performs rapid ambiguity fixing in conjunction with the phase delay to achieve positioning. This invention achieves rapid ambiguity fixing for PPP-B2b service in dynamic scenarios, significantly shortening convergence time and improving positioning accuracy.

The application relates to the technical field of city planning, and discloses a micro-size city expansion measurement method based on a central grid area index, which comprises the following steps: constructing a basic grid, performing step-by-step spatial expansion on the basic grid to form multiple grids of different scales; dividing the research area into uniform grids by using the grids of different scales, then calculating the central grid area index CGAI corresponding to each grid under each scale, and formulating a screening rule based on the central grid area index CGAI, so as to screen the grids, and the remaining grids constitute the CGAI distribution map of the research area corresponding to the grid. The CGAI distribution maps of different scales are reasonably evaluated, and the CGAI distribution map with the highest evaluation result is taken as the final result output.

This invention provides a method for determining the integrity support data of BeiDou PPP-B2b service. It utilizes long-term statistical data from BeiDou PPP-B2b messages, broadcast ephemeris, and precise ephemeris to calculate instantaneous ranging error and worst-case spatial signal ranging error. A two-step over-boundary envelope method is used to enclose the worst-case spatial signal ranging error distribution to obtain a two-step Gaussian over-boundary envelope distribution, subsequently determining the sum of the values ​​in the ISD parameters. Based on the sum, the upper limit value UB of the worst-case spatial ranging error is obtained. The instantaneous spatial signal ranging error within the PPP-B2b service area is calculated using a grid simulation method. Then, using the upper limit value UB as an anomaly detection threshold to remove outliers, the standard deviation is calculated to obtain the sum of the values ​​in the ISD parameters. Finally, using the upper limit value UB as an anomaly detection threshold, the number of faults and the average duration of faults for individual satellites and constellations are statistically analyzed to calculate the sum of the values ​​in the ISD parameters. This provides accurate prior input parameters for ARAIM, improving the reliability of ARAIM fault monitoring, elimination, and protection level calculation. This method can also be used as an evaluation method for the long-term service performance of PPP-B2b.

The application discloses a ground point cloud filtering method based on curvature dynamic segmentation and a storage medium, belongs to the technical field of point cloud data processing, and carries out point cloud preprocessing and blocking; curvature dynamic segmentation and TIN cluster semantic analysis based denoising are carried out; for steep terrain areas, curvature threshold recursive segmentation sub-blocks are carried out; for flat areas, seed points with terrain representation are obtained by screening based on global elevation minimum point constraint and linear fitting. Then, progressive triangulation network iteration encryption optimization is carried out. Finally, a ground DEM based on grid filling is constructed, and a bilinear interpolation filtering based on the ground DEM is carried out, the difference between the actual elevation of the point cloud and the DEM elevation is calculated, if the difference is less than the final distance threshold, the ground point is marked, and the ground classification of the whole point cloud is completed. The application specifically solves the core problems of large filtering data volume, low processing efficiency and poor adaptability to complex terrain of the traditional triangulation network, and has high filtering precision and engineering practicability.

The application provides a positioning method and device based on 5G macro base station broadcast, and relates to the technical field of high-precision positioning. The method comprises the following steps: performing consistency check and alignment processing on original observation data of multiple reference stations, constructing a grid cell set, and generating a differential data stream by fusing differential corrections in the grid cell with a multi-dimensional dynamic weight mechanism; forming a target differential data stream through multi-dimensional residual analysis and adaptive threshold discrimination screening; performing time alignment broadcast through a 5G macro base station under a single-frequency network synchronization mechanism; establishing a time alignment relationship by a terminal to perform network RTK solving to generate positioning data; and outputting a final positioning result after determining the stability of the solving through residual autocorrelation analysis. The application can form an overall closed-loop constraint among regional modeling, broadcast synchronization and terminal solving stability determination, thereby improving the positioning accuracy.

The present application relates to the technical field of GNSS satellite navigation positioning and GNSS meteorology, in particular to a method for fusing GNSS and ERA5 tropospheric zenith delay in a small area, which comprises correcting the geopotential height of four adjacent ERA5 grid positions of a GNSS station to the ellipsoidal height of the GNSS station, and interpolating the ERA5 tropospheric zenith delay of the four adjacent grid points to the GNSS station based on the inverse distance weighting method. The present application corrects the systematic deviation of ERA5 ZTD, makes up for the deficiency of traditional interpolation methods which excessively rely on the distribution density of stations, supports the flexible construction of ZTD grid with different spatial resolutions to balance the calculation load and spatial details, effectively eliminates the systematic error and restores the smoothed local micro-meteorological details through the fine statistical modeling of the residual grid, and realizes the regional tropospheric delay modeling with high precision and high spatial resolution.

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.