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Data Acquisition, Research and Analysis on Galileo E1 Signal

Author: WuZhongJie
Tutor: MaoXuChu
School: Shanghai Jiaotong University
Course: Navigation,Guidance and Control
Keywords: Galileo satellite navigation system BOC modulation Digital IF signal Capture Track Navigation message Demodulation
CLC: P228.4
Type: Master's thesis
Year: 2010
Downloads: 162
Quote: 0
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Abstract


Galileo satellite navigation system (Galileo) created by the European Community, and the modernization of the U.S. Global Positioning System (GPS) to become a research focus of this attention. Galileo signals using the new modulation scheme - the binary offset carrier modulation (Binary Offset Carrier, BOC), to reduce the mutual interference between the signals, to improve the positioning performance to become the direction of development of the modern satellite positioning system. Galileo E1 signal band is shared with the GPS for civilian important band, so great research value. Galileo launch the Code were experimental satellite GIOVE-A and GIOVE-B, running in good condition. In this paper, the launch of the Galileo satellite GIOVE-A E1 signal, signal simulation, signal acquisition, and the subsequent processing of the signal. The prerequisite high precision Galileo satellite signals as the data source of the signal demodulation algorithm and positioning algorithm Galileo applied research Galileo E1 band satellite signal simulation for the development and testing of high dynamic receiver provide a real simulation environment has a positive meaning domestic research in this area is still lacking. This paper presents two different platforms under the Galileo E1 the IF signal simulation method, its Doppler shift adjustable, duration adjustable and the signal-to-noise ratio is adjustable. After signal analysis and capture experiments, confirmed that the signal generated is fully equipped with the Galileo E1 signal characteristics, can be used for positioning of the receiver solver. Galileo software receiver front-end part of the data collection. GPS receiver chip based on down-conversion, serial-to-parallel conversion and sampling to quantify a series of steps to complete the work of Galileo GIOVE-A satellite signal acquisition and subsequent signal processing to provide reliable real data sources. Galileo receiver software signal processing section of the core part, including signal capture, capture fine, tracking and demodulation of the navigation data. Real signal data processing section above, and proposed a series of improved algorithm Unlike GPS, Galileo signals. Traditional GPS signal acquisition algorithm including the string Search and FFT search method, but applied to the Galileo signal effect was not significant. Based Galileo signal characteristics and the characteristics of BOC modulation proposed the cycle extension FFT search method and based on the capture cross-correlation, auto-correlation characteristics of retention BOC modulation algorithm. After the real signal processing, the algorithm can be applicable to the Galileo E1 real signal. Traditional GPS signal tracking algorithms in signal tracking link the same can not be effectively applied to the Galileo E1 signal, traditional tracking algorithm based on an improved ahead and ultra lag tracking loop algorithms for BOC modulation characteristics, the results show that the algorithm can effectively track the Galileo true signal, the navigation data to be processed can be obtained. Galileo E1 signals having a structure different from the GPS navigation message. This paper describes the structural characteristics demodulate the navigation information from the tracking data and demodulate the corresponding navigation information. After the analysis verify, confirm and understand the tone of navigation data reliability and correctness, can be used for subsequent positioning algorithm. In summary, this article on Galileo the band E1 band signal a series of system simulation and data processing, to solve a series of key issues for the Galileo system brought about by the introduction of the BOC modulation. This article can provide reliable algorithms data and reference data for the Galileo software receiver, providing an important reference source for its realization, and provide effective protection for the follow-up of the Galileo positioning algorithm.

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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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