Method for improving positioning accuracy of satellite-based augmentation system based on partition correction

Abstract

A zone correction-based method for improving positioning accuracy in a satellite-based augmentation system, including: dividing an area to be observed into a plurality of observation areas, and configuring a plurality of monitoring stations in each observation area; acquiring residual of each monitoring station by processing observation data; acquiring mean clock error value of each monitoring station according to observation residual; acquiring ambiguity reduction value of each observation area according to residual data; acquiring zone corrections of each observation area according to residual data and ambiguity reduction value data; and providing a user with a zone corrections calling service by means of a network or a satellite link. The method carries out wide-range area configuration to monitoring stations and calculates the zone corrections for use in network and satellite-based broadcasts on the basis of the monitoring stations to refine error correction in user positioning.

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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