PPP positioning method applied to satellite navigation landing outfield detection

Abstract

The invention provides a PPP positioning method applied to satellite navigation landing outfield detection. On the basis of mobile communication data transmission, a precise ephemeris and a precise clock difference of an IGS network station are obtained in real time, and a broadcast ephemeris and observation data are obtained by a receiver antenna; an influence on an ionized layer is eliminated based on double-frequency ionized-layer-free zero-difference observation value combination, and ambiguity and coordinate accumulation is carried out by using extended Kalman filter, and rapid convergence is carried out; and ambiguity information and a covariance matrix that are obtained each time are introduced into a Lambda algorithm to carry out resolution, thereby obtaining a correct ambiguity value and a correct receiver coordinate. According to the invention, a requirement that the cm-level positioning precision can be reached by the signal receiver can be realized. Meanwhile, because the precise track and the precise clock difference that are issued by the IGS network station are obtained in an on-line mode in real time and the high-precision positioning is realized in real time, the practical engineering requirement can be met well.

Description

technical field [0001] The invention belongs to the field of satellite navigation and relates to a high-precision positioning method. Background technique [0002] Satellite navigation has the advantages of all-weather, wide coverage and low cost, and has become the most important means of navigation in the navigation system. In satellite navigation and positioning, there are mainly two positioning methods: pseudo-range single-point positioning and differential positioning. Pseudo-range single-point positioning can achieve positioning with only one receiver, and has good real-time performance. The single-positioning accuracy is generally tens of meters , can well meet the needs of rough location positioning, but the accuracy requirements cannot meet the actual needs of surveying and mapping, detection, calibration, etc. To obtain high-precision coordinate positions, the technology used is mainly relative positioning technology. Relative positioning requires at least two rec...

AI Technical Summary

Problems solved by technology

Relative positioning technology has high positioning accuracy and good real-time performance, which can well meet the high-precision position requirements. However, with the increase of the baseline length, the error correlation between the base station and the rover weakens, and the positioning accuracy of the rover decreases.

When there is no reference point in the measurement area to be measured or the CORS system cannot cover it, long-distance joint measurement is required to introduce known points, the workload is very large, and the positioning accuracy decreases

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