The rtd method of determining the result of arbitrary coordinate system based on ntrip

Abstract

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.

Description

technical field [0001] The invention relates to the fields of geodetic surveying and satellite navigation, in particular to an RTD method for measuring results of an arbitrary coordinate system based on NTRIP. Background technique [0002] RTD (Real Time Pseudorange Difference) is an application of GNSS (Global Navigation Satellite System). Its system consists of several reference stations and rover stations that are relatively close (usually less than 100km). The coordinates are known precisely. Since there is a strong error correlation between the pseudorange code observations received by the reference station and the rover at the same time, the pseudorange correction number and its change rate are sent from the reference station to the rover, and then the pseudorange differential positioning is performed. It can eliminate or weaken public satellite ephemeris errors, satellite clock errors, ionospheric errors, and tropospheric errors, and realize real-time positioning of ...

AI Technical Summary

Problems solved by technology

[0014] In order for the user to obtain the coordinates of the ginseng coordinate system, there are three conventional methods: 1) The user submits the measured ECEF coordinates in written form to the surveying and mapping results storage unit approved by the State Bureau of Surveying and Mapping, and the latter coordinates after the approval. Conversion, and the result will be sent back to the user. This mode has good confidentiality, and the accuracy and reliability of the results are guaranteed, but the procedure is cumbersome, the work efficiency is low, and it is not real-time, which cannot meet the needs of real-time stakeout ginseng coordinate system coordinates

2) The surveying and mapping results storage unit approved by the State Bureau of Surveying and Mapping establishes a coordinate conversion network service system [2] [3], authorized users can submit the measured ECEF coordinates online through the network, and the service system will feedback the results through the network after completing the coordinate conversion online For the user, the advantage of this mode is that the user is easy to use and the results are standardized, but it can only be carried out after the measurement is completed, and it cannot meet the needs of real-time stakeout ginseng coordinate system coordinates

3) The user obtains the parameters by himself through the joint measurement of known points. There must be a distribution of known points near the measurement area. The field workload is large, the data processing is relatively complicated, the requirements for user quality are high, the operation efficiency is low, and the accuracy of the results is low. reliability is not guaranteed

[0015] At present, there is no literature mentioning the technical method of measuring the coordinates of the ginseng coordinate system and the normal height in real time in the RTD mode. However, due to the different positioning modes, the method of transforming the coordinates of the reference station in the differential message similar to the RTK mode is not suitable for RTD

Images