Real-time signal receiving and processing system of public frequency points of Beidou navigation satellite system and GPS

Abstract

The present invention discloses a real-time signal receiving and processing system of public frequency points of a Beidou navigation satellite system and a GPS. Signals of the public frequency points of the Beidou navigation satellite system and the GPS enter three RF radio frequency front end modules through the same antenna, are subjected to a series of amplification, filtering and down-conversion processing, and are converted to 2bit medium frequency digital signals through the A / D (Analog to Digital) conversion, and the medium frequency digital signals are acquired to the internal storage of an FPGA under the control of the FPGA, are stored to be a data block with a certain length in a ping-pong mode, and are transmitted to a computer in a block mode through a USB controller. The real-time signal receiving and processing system of public frequency points of a Beidou navigation satellite system and a GPS is able to perform rapid capture and real-time data processing of signals of the public frequency points of the Beidou navigation satellite system and the GPS on the software architecture of a computer platform, and the like, therefore positioning accuracy, reliability, integrity and availability of a single positioning system are substantially improved; and moreover, the software development on the basis of the software radio technology is performed, thereby getting rid of the algorithm of a traditional hardware receiver and realizing the reconfiguration of a research mode.

Description

Technical field: [0001] The invention relates to a signal receiving and processing system for navigation and positioning, in particular to a system for receiving and processing real-time signals 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 the satellite navigation an...

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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