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Weak GPS signal capture key technology research

Author: ChenHongGuang
Tutor: TianZhong
School: University of Electronic Science and Technology
Course: Electronics and Communication Engineering
Keywords: GPS Quadrature detector Duffing chaotic oscillator P-code direct acquisition
CLC: TN967.1
Type: Master's thesis
Year: 2011
Downloads: 168
Quote: 1
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Abstract


Under normal circumstances , the GPS signal reaches the ground strength is -130dBm, the receiver can easily be captured . However, when the receiver in indoor , tunnels , forests and other environmental penetration loss , reflection loss , diffraction loss and signal fading , the rapid decay of the signal strength . So that there are some difficulties in capturing these signals . In order to capture these weak GPS signal , the receiver may be through a series of methods to improve the detection SNR , such as: the coherent integration and non-coherent integration and differential coherent integration . For the P-code directly captured , due to the length of the P-code and the influence of the uncertainty interval , so that the capture time is far greater than the capture time of the C / A code . P code directly to capture algorithms focus on how to compress the P code directly capture time . To solve the above problems , the main contents of this thesis include the following aspects : 1 . Coherent quadrature detector , non- coherent integration detector and differential coherent the integral detection performance of the detector as well as the carrier Doppler frequency shift , the navigation data modulation and code Doppler shift detector detection performance of the above three in-depth analysis . And by analyzing and comparing the pros and cons of the three detector performance in different circumstances . Proposed a Duffing chaotic oscillator GPS signal acquisition algorithm , nonlinear characteristics of the algorithm using chaotic oscillator and phase trajectory changes in the characteristics of GPS Doppler frequency shift estimate matlab simulation confirmed the algorithm better performance. Introduced two popular P-code direct acquisition algorithm , code phase offset the impact on the performance of the direct average method and to address the impact of improved algorithm . After that , a fusion of two algorithms P-code direct acquisition algorithm matlab simulation verify the feasibility and efficiency of the algorithm .

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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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