Data processing method for Beidou and GPS common frequency point real-time signal receiving and processing system

Abstract

The invention discloses a data processing method for a Beidou and GPS common frequency point real-time signal receiving and processing system. Beidou second generation and GPS common frequency point signals are transmitted into three RF front-end modules through the same antenna, through a series of amplification, filtering and down-conversion, the signals are converted into 2-bit medium-frequency digital signals in an A / D mode, the medium-frequency digital signals are acquired into an internal storage of an FPGA under the control of the FPGA and stored as data blocks of certain length in a ping-pong mode, and finally, the data blocks are transmitted to a computer through a USB controller. The method has the advantages that the technical purposes that the Beidou second generation and the GPS common frequency point signals are captured rapidly on a software framework of a computer platform and the data are processed in real time are achieved, and the locating accuracy, the reliability, the integrity and the usability of a single locating system are remarkably improved; based on software development of the software radio technology, an algorithm of a traditional hardware receiver is eliminated, and a reconfiguration research mode is achieved.

Description

Technical field: [0001] The invention relates to a signal receiving and processing system for navigation and positioning, in particular to a data processing method for the real-time signal receiving and processing system of Beidou II and GPS public frequency points. Background technique: [0002] The "2006 China Aerospace White Paper" announced that five major aerospace projects will be launched in the next five years, and the deployment of the second-generation "Beidou" satellite navigation system with military applications will be completed within four years. Some experts said that after the deployment of the second-generation "Beidou" satellite system is completed, China will be able to launch precise attacks on small targets, and some media in the United States believe that China is using the Beidou project to suppress the military advantage of American satellites. With the improvement of my country's comprehensive national strength and the comprehensive penetration of t...

AI Technical Summary

Problems solved by technology

[0004] Beidou II uses the same carrier frequency and modulation method as GPS, but uses a different pseudo-random code and data encoding method, GPS receivers cannot process Beidou II signals

And a small number of receivers that can process Beidou 2nd generation signals are only post-processed by general-purpose GPS receivers, but they still cannot be used as real-time applications.

Generally, the cold start time of the GPS hardware receiver is tens of seconds, the hot start is about 1 second, and the processing time of automatic positioning is more than 10 seconds

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