Satellite-based augmentation system positioning accuracy improvement method based on regional correction

Abstract

The invention discloses a satellite-based augmentation system positioning accuracy improvement method based on regional correction. The satellite-based augmentation system positioning accuracy improvement method comprises the steps of: dividing a region to be observed into a plurality of observation regions, and setting a plurality of observation stations in each observation region; acquiring residual data of each observation station through processing observation data; acquiring clock difference mean value data of each observation station according to the observation residual data; acquiring ambiguity reduction value data of each observation region according to the residual data; acquiring regional correction value data of each observation region according to the residual data and the ambiguity reduction value data; and providing a user with a regional correction value data calling service through a network or a satellite link. According to the satellite-based augmentation system positioning accuracy improvement method based on regional correction, the wide-range regional design for the observation stations is carried out, the regional correction values used for network and satellite-based broadcast are calculated on the basis of the observation stations, the error correction in user positioning is refined, and the user positioning accuracy can be improved; and the satellite-based augmentation system positioning accuracy improvement method has the advantages of high accuracy and wide application range.

Description

technical field [0001] The invention relates to the field of wide-area satellite-based augmentation, in particular to a method for improving positioning accuracy of a satellite-based augmentation system based on partition correction. Background technique [0002] The services provided by the Global Navigation Satellite System (GNSS) include basic navigation and satellite-based augmentation. Among them, in order to improve the accuracy of real-time service of the system, the basic idea of ​​satellite-based augmentation is to distinguish the main error sources such as satellite orbit error, satellite clock error and ionospheric delay, and establish a model of each error source to correct these errors in basic navigation. parameter error. These calculated corrections are called wide-area differential corrections, and the satellite telegraph system broadcasts the wide-area differential corrections to users through satellite links. [0003] The current navigation augmentation s...

AI Technical Summary

Problems solved by technology

[0007] However, the processing technology of the existing satellite-based augmentation system has the following problems: (1) only the pseudo-range observation is used, and the wide-area differential correction is affected by the pseudo-range accuracy, which limits the improvement of the positioning accuracy; (2) if the phase Observations, due to the ambiguity and cycle slips in the phase observations, the corresponding data processing has a problem of long convergence time; (3) the correction of the space propagation segment (mainly the ionosphere) is also based on the pseudorange observations. There are limits to the improvement of positioning accuracy

[0008] Since the current satellite-based enhancement processing only uses pseudo-range observation data, its service accuracy is limited to the meter level, and its positioning accuracy can only reach a maximum of about 1m, which cannot meet the higher-precision positioning needs of wide-area users

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