Design and Analysis of GPS/Galileo Satellites Navigation Signal Tracking Loops
Date Issued
2007
Date
2007
Author(s)
Chen, Hong-Yu
DOI
en-US
Abstract
Global Navigation Satellite System (GNSS) is the standard generic term for satellite navigation systems that provide autonomous geospatial positioning with global coverage. As of 2007, the United States NAVSTAR Global Positioning System (GPS) is the only fully operational GNSS. The European Union’s Galileo positioning system is a next generation GNSS in the initial deployment phase, scheduled to be operational in 2010.
Galileo system employs modern signal structure and modern BOC (Binary Offset Carrier) modulation. A BOC modulation multiplies a spreading code with a square wave sub-carrier that has a frequency multiple of the code rate. It is different from GPS signal modulation. We need some new tracking algorithm for Galileo signal. In this thesis, we discussed the two methods for Galileo signal tracking.
Tracking is the part of the baseband signal processing. The carrier phase tracking loop, the carrier frequency tracking loop, and the code tracking loop are the three tracking loops in receiver. We analyse them in this thesis. The noise bandwidth in the tracking loop is the most important parameter. We described how to determine the optimal noise bandwidth. And then, some RF effects are discussed in this thesis.
Subjects
全球衛星定位系統
伽利略
追蹤迴路
最佳化雜訊頻寬
鎖定偵測
GPS
Galileo
Tracking
Optimal noise bandwidth
Lock detector
Type
thesis
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