7 results about "Normal height" patented technology

The application discloses a shaft elevation transfer method based on gravity measurement, comprising the following steps: arranging an upper known point and a lower to-be-measured point in a shaft, and obtaining a measured gravity value and a normal height of the upper known point; calculating the normal gravity of the upper known point according to the geodetic coordinates of the upper known point, and obtaining the disturbing gravity of the upper known point according to the measured gravity value and the normal gravity; setting auxiliary points above the plumb of each of the upper known point and the lower to-be-measured point, and obtaining the disturbing gravity gradient of each measuring point according to the gravity observation value of each measuring point and the corresponding auxiliary point; constructing a height difference transfer constraint model based on the disturbing gravity and the disturbing gravity gradient of the upper known point and iteratively solving to obtain the geodetic height difference between the upper known point and the lower to-be-measured point; and calculating the normal height difference between the upper known point and the lower to-be-measured point based on the geodetic height difference, and determining the normal height of the lower to-be-measured point according to the normal height of the upper known point and the normal height difference.

The invention relates to the technical field of remote sensing image processing, in particular to a satellite image RPC parameter elevation optimization method fused with a gravity field model. Comprising the following steps: S1, aerial triangulation encryption and key point acquisition; s2, coordinate transformation; s3, primarily calculating geodetic coordinates by the model; s4, carrying out elevation conversion on the EGM2008 model; s5, constructing a block adjustment model considering the gravity field; s6, iterative solution and output are carried out; according to the method, the earth height (H) directly output by the RPC model is accurately converted into the normal height (h) by introducing the EGM2008 earth gravitational field model, so that the elevation system error caused by the fluctuation of the geoid in a complex region with abnormal and remarkable gravity is effectively eliminated. The normal height is used as a hard constraint to be fused into block adjustment, and the RPC parameters are optimized in a targeted manner, so that the final elevation positioning precision is improved by more than 30% compared with that of a traditional method, and the elevation precision requirement of topographic map surveying and mapping with the measuring scale of 1: 10000 and even 1: 2000 can be met.

The application provides an intelligent leveling system based on three GNSS coordinate cooperation and a measuring method thereof. The system comprises an intelligent level gauge, a first intelligent leveling rod and a second intelligent leveling rod. All of them are provided with independent GNSS modules and can obtain three-dimensional coordinates in real time. The level gauge can obtain the front and rear sight distances through coordinate inversion and calculate the sight distance difference, and then send the sight distance difference to the display screens of the two rods to guide the first rod to be in place. The leveling rod is provided with an inclination sensor, which can automatically switch among the three states of movement guidance, rod monitoring and righting recording according to the inclination angle, and automatically record the three-dimensional coordinates to form an electronic notebook at the righting moment. The leveling rod can be switched to an RTK mobile station through one key, which is used for layout and recovery of buried leveling points and accurate recovery of temporary leveling points the next day. When the leveling rod is righted for the first time after station migration, the coordinates are automatically compared to realize the detection and tracing of the centimeter-level error. The system can synchronously collect the geodetic height and normal height of each rod point, automatically calculate the height anomaly value and cumulatively form a local height anomaly model.

A regional elevation datum calculation method based on error partition optimization comprises the following steps: determining a test point in a target region, and measuring geodetic coordinates and a first normal height hP of the test point through a GNSS (Global Navigation Satellite System) and a level gauge; according to the geodetic coordinates of the test points, the gravitational potential of the average normal gravity # imgabs0 # of the test points based on the 1985 national elevation datum plane is calculated, and the gravitational potential of the elevation datum of the target area is calculated through a gravitational potential difference method; calculating a second normal height h * P of the test point by using the gravitational potential difference method again; according to the difference value between the second normal height h * P and the first normal height hP, obtaining a test point error, dividing a test point into a positive error region and a negative error region, and respectively calculating the average normal gravity # imgabs1 # and the second normal height h * P until the test point error reaches a set precision requirement, thereby completing the calculation of the elevation reference of the target region. The problem of insufficient non-uniform error processing is effectively solved, the calculation precision is improved, and the systematic error of normal high calculation is reduced.

The embodiment of the application discloses a data processing method and related device, when the availability of height anomaly data in a first height system is low and the availability of height anomaly data in a second height system is high, the height anomaly data corresponding to multiple positions in the second height system can be obtained, the difference between the height anomaly data of the multiple positions in the second height system is used to simulate the difference between the height anomaly data of the multiple positions in the first height system, so that when there is a position in the multiple positions corresponding to normal height data in the first height system, the normal height data corresponding to the remaining positions in the first height system can be analyzed by combining the difference between the height anomaly data and the difference between the geodetic height data corresponding to the multiple positions in the first height system, the accuracy of the normal height data is ensured, and the data analysis difficulty is reduced and the data analysis efficiency is improved.

The invention discloses a method for applying GPS static measurement result conversion parameters to RTK measurement, and belongs to the technical field of engineering measurement. The method comprises the following steps: S1, carrying out synchronous static observation on a CPII control network in a measurement area by adopting a plurality of double-frequency GPS receivers, constructing a network in an edge-connected manner, calculating a baseline vector grid-connected adjustment, and obtaining a three-dimensional coordinate of a control point WGS-84; s2, the digital level gauge carries out fourth level measurement, height difference is rechecked and adjusted, and normal height is obtained; s3, performing segmented area measurement, solving plane conversion parameters based on WGS-84 coordinates and engineering coordinates, and solving elevation conversion parameters by combining geodetic height and normal height; s4, calculating an inspection plane residual error and an elevation residual error; and S5, importing the parameters into RTK equipment, erecting the base station at any control point, and performing real-time dynamic measurement by the moving station. According to the method for applying the GPS static measurement result conversion parameters to RTK measurement, the base station can be flexibly erected, site point correction is not needed, and efficiency and precision are improved.

This invention discloses a GNSS-based dynamic measurement method and system for elevation control networks. The method includes: during elevation control network resurvey, acquiring the geoid differences of each node of the elevation control network relative to the stable elevation starting point; performing phased synchronous GNSS observations on the stable elevation starting point and each node to obtain the real-time geodetic height of the stable elevation starting point and the real-time geodetic height of each node; and calculating the real-time normal height of each node based on the normal height and real-time geodetic height of the stable elevation starting point, the geoid differences, and the real-time geodetic height of each node. By utilizing GNSS technology to achieve high-precision dynamic measurement of the elevation control network, this invention solves the shortcomings of using leveling surveys for maintaining elevation control networks, such as station-by-station transmission, large number of personnel, high cost, low efficiency, and long time consumption. It improves operational efficiency, reduces the number of personnel, and enables the maintenance accuracy of the elevation control network to reach the same level as leveling network resurveys.