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GPS RF Front End Design and Research of GPS Signal Acquisition Method

Author: LiYang
Tutor: XiXiaoLi
School: Xi'an University of Technology
Course: Communication and Information System
Keywords: GPS RF front-end High dynamic Low signal-to-noise ratio Capture Detect Threshold
CLC: P228.4
Type: Master's thesis
Year: 2008
Downloads: 713
Quote: 7
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Abstract


GPS RF front end and GPS signal acquisition method occupies an important position in the GPS receiver, the the former performance will directly affect the performance of the receiver sensitivity GPS receiver and a subsequent signal processing part. The performance of the latter determines receiver intercepts the useful signal. Therefore, the main purpose of this paper is that the GPS RF front end and GPS signal acquisition method. GPS signal capture GPS signal acquisition method is divided into two aspects, namely the high dynamic environment of GPS signal acquisition and low SNR environment. First of all, on the basis of the basic principles of the basic principles of GPS and RF circuit design, explore GPS RF front-end design, application Zarlink GP2010 chip design to meet the requirements of the GPS RF front-end. Secondly, traditional capture methods rely on focus to meet the high dynamic GPS signal quickly capture requirements FFT acquisition method based on the code phase and carrier-based FFT acquisition method. The study showed that: The former method can be completed in while searching one frequency unit searching all code phase point, its speed is far superior to the conventional sliding correlation capture method. The latter method can be completed on the basis of the search a code phase unit to search the entire Doppler frequency, and its frequency search range is large, easy to implement hardware. Finally, the GPS signal acquisition technology in the environment of low signal-to-noise ratio. Coherent integration and non-coherent integration algorithm simulation and experimental performance characterization of the problems of these two algorithms: bit flip and squared loss. The highlights a differential coherent, experimental simulations show that this method can eliminate the above shortcomings, the performance is far superior to the coherent integration and non-coherent integration method is very suitable for the environment of low signal-to-noise ratio of the GPS signal acquisition. At the same time, through the study of the capture threshold, in particular on the adaptive threshold in the noise power estimation method proposed three valid estimation of the noise power. In order to improve the detection probability of capture, take evaluate the performance of the M-search detector Tang search detector and N derived formula for the total probability of false alarm of the detector, the total probability of detection and the average dwell time. Verified through numerical discussion of the the detector parameters role and capture performance. Its findings parameters to determine the actual detector has a guiding role.

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CLC: > Astronomy,Earth Sciences > Surveying and Mapping > Geodesy > Satellite geodesy and space geodesy > Global Positioning System (GPS)
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