Design and Analysis of Carrier and Code Synchronization for GNSS Receiver
Date Issued
2008
Date
2008
Author(s)
Liu, Dong-Hong
Abstract
The United State Global Positioning System (GPS) is the familiar Global Navigation Satellite System (GNSS). The European Union will develop its own next generation GNSS, called Galileo Positioning System. In the thesis, the Low-IF receiver architecture is adopted to receive GPS/Galileo E1 signal. In the thesis, the non-constant group delay of the RF front-end complex filter and the baseband signal processing effect is analyzed for low-IF receiver. Galileo E1 system has a code period of 4ms which is quadruple that of GPS C/A code. In other words, due to the large number of hypotheses in code phase at acquisition stage, a longer searching time or more hardware resource is required. In the thesis, the proposed method acquires these satellite signals with hardware complexity reduction. The underlying concept in the method is to modify the code structure and shorten the code period such that the acquisition complexity can be decreased. However, the computation reduction by code shortening is not for free. The orthogonality of the modified code will not be as good as the original code anymore---there is degradation of maximum correlation gain. In the most cases of this thesis, the performance degradation is acceptable when mean acquisition time is used as a performance metric.
Subjects
GPS
Galileo
Acquisition
Group delay
Threshold
Integration time
Type
thesis
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