39 results about "Reference ellipsoid" patented technology

The invention relates to a vertical reference detection method of a tide gauge station by using a GNSS buoy, and belongs to the technical field of vertical reference detection of a tide gauge station. The present invention includes the following steps: S1: GNSS precision level measurement, S2: on-site deployment of GNSS buoys, S3: erection of GNSS static reference stations, S4: setting of GNSS observation time, S5: calculation of GNSS buoy SSH, S6 : Data filtering of tide signal SSH, S7: Elimination of SSH geoid difference, S8: Unification of GNSS and vertical datum of tide gauge station. The present invention uses high-precision GNSS altimetry buoys to observe the sea surface height information under the WGS-84 reference ellipsoid datum, avoids the above three problems, conveniently and economically deploys in sea areas near marine stations, and avoids reference displacement errors and levels of tide gauge stations Measurement errors are accumulated, and tide gauge station benchmarks are unified in any sea area (including) remote sea islands and reefs.

The invention discloses a method for surveying and setting a railway center line based on a reference ellipsoid, comprising the following steps: S1: determining the starting point information, ending point information and intersection point information of the railway line; S2: calculating the comprehensive elements of the curve by using a geometric analysis method; S3: Calculate the mileage of each main point of the curve according to the comprehensive elements of the curve; S4: compare the mileage of each measuring point with the numerical value of the mileage of each main point of the curve, and determine the line segment to which each measuring point belongs; S5: calculate the ellipsoid coordinates of each measuring point; S6: According to the ellipsoidal coordinates of each measuring point, the center line of the railway is measured and set. By adopting the technical solution provided by the invention, the longitude and latitude of each point on the center line of the railway on the reference ellipsoid can be directly used for measurement and design, so that the measurement and calculation results have no projected deformation or the deformation can be minimized. Moreover, the data calculated on the reference ellipsoid can be used to obtain results on various projection surfaces according to various projection rules, which makes the calculated data reusable and universal.

The invention discloses a disturbing gravity-based quasi-geoid land-sea seamless splicing method. In the method, the physical characteristic that the disturbing gravity is not limited by local height datum is fully utilized, a unified earth reference ellipsoid is taken as a coordinate reference frame, the land-sea unified disturbing gravity is calculated by adopting land-sea reference unified global navigation satellite system (GNSS) and gravity data, and the land-sea unified disturbing gravity is introduced to the more strict arithmetic provided by the invention so as to realize quasi-geoid land-sea seamless splicing. Different from the conventional fit algorithm for calculating land-sea height anomaly by utilizing gravity anomaly and a Stokes formula, the method is strict theoretically,and can eliminate result errors caused by the oddness of a kernel function.

A method based on NTRIP for measuring an RTD of an arbitrary coordinate system result carries out extension on a source node, is used for conveying moving station requests with details, does not need to modify NTRIP, and simply needs to add judgments and algorithms to NtripCaster software, or adds an NtripProxy relay module between NtripCaster and a moving station. A coordinate under a reference-ellipsoid-centric coordinate system needs to be acquired in real time, a corresponding source node simply needs to be selected when a server is logged in, and non-secret seven parameters are filled in a handhold notebook. If normal height needs to be acquired in real time, a corresponding source node simply needs to be selected when the server is logged in. If ECEF coordinate needs to be obtained in real time, a corresponding source node simply needs to be selected when the server is logged in. An operating mode is basically unchanged, under the premise that a privacy policy is met, the reference-ellipsoid-centric coordinate system and the normal height of real-time survey staking of the RTD can be achieved, and surveying and mapping production efficiency is remarkably improved.