Method for receiving Beidou satellite-based high-precision differential information

Abstract

The invention provides a beidou space-based high-precision differential information receiving implementation method. The method comprises the steps of firstly, performing signal capturing based on a matching filter, performing carrier tracking by use of a second-order phase-locked loop, keeping the local code of a receiver and a received signal synchronous by use of a designed code tracking ring, and performing bit synchronization by use of a histogram, next, searching for frame headers from different differential information broadcast by two satellites and completely subframe synchronization, and finally, analyzing the subframe data checked according to the appointment in an ICD file to obtain differential information. According to the beidou space-based high-precision differential information receiving implementation method, a user can receive high-accuracy beidou second generation differential information of the standard format within satellite signal available regions, and therefore, all-weather, continuous and wide-area high-accuracy differential services can be realized.

Description

technical field [0001] The invention relates to a differential information receiving method. Background technique [0002] Global Navigation Satellite System (GNSS, Global Navigation Satellite System) is currently developing at a rapid speed, and its application fields are becoming more and more extensive, which also puts forward higher requirements for the accuracy of navigation and positioning. In order to eliminate errors caused by satellite orbit errors and ionospheric refraction, differential GNSS technology is widely used in satellite positioning. [0003] Differential GNSS positioning (DGNSS) is a widely used real-time positioning technology at present. The purpose of calculating the difference between two observations is to eliminate common items, including common errors and common parameters, which is a method to improve GNSS positioning or timing performance. [0004] The Beidou second-generation satellite navigation and positioning system is an independently dev...

AI Technical Summary

Problems solved by technology

However, the existing ground-based augmentation system has a single means of broadcasting, and the technical system results in limited system capacity, making it difficult to serve large-scale users in wide areas.

my country's satellite navigation ground-based augmentation system is still in the research stage, and domestic ground-based augmentation equipment is also under construction, and large-scale applications have not yet been realized

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