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P-code GPS satellite positioning system directly capture technology research

Author: JinZuo
Tutor: LianBaoWang
School: Northwestern Polytechnical University
Course: Communication and Information System
Keywords: GPS P code High dynamic Code Acquisition FFT
CLC: TN967.1
Type: Master's thesis
Year: 2006
Downloads: 562
Quote: 7
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Abstract


The study focused on in low signal-to-noise ratio , the Doppler shift of the P code directly capture technology , the P code based on the frequency domain FFT residing locally bidirectional search method to achieve fast capture GPS receiver program . The program will be part of the IF sampling data resides locally reuse many times , until the the local reappearance code phase and resident data corresponding P code phase completed capture . To reverse search data resides proposed a reverse P - code generator structure , so that the generated code sequence with standard P - code sequence full reciprocal and verify its effectiveness . In addition, the program abandon their traditional code tracking loop - carrier tracking loop work in parallel capture all the Doppler shift of the dynamic characteristics of the system , while the serial by the search code phase search , effectively reducing the false alarm probability. Simulation results show that the introduction of the FFT algorithm can reduce the computational complexity more than one order of magnitude ; introduction of the the reverse P code generator resides receive data quickly reverse search , capture system clock frequency can be increased by 5 to 10 times or even high; serial search carrier Doppler and code phase can effectively reduce the frequency shift Doppler caused by the signal - to - noise ratio loss . Choose a different carrier Doppler search step value , depending on the use environment , the Doppler shift range , the the FFT computation Points and effective number of points , you can get different search speed , dynamic performance and anti- noise performance .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radio navigation > Navigation systems of the various institutional > Satellite navigation system
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