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Based on the TDOA and FDOA multi- star , co-locating technology research

Author: GuoWenLong
Tutor: ShuFeng
School: Nanjing University of Technology and Engineering
Course: Communication and Information System
Keywords: TDOA FDOA CRLB MRC Hough Transform
CLC: TN95
Type: Master's thesis
Year: 2009
Downloads: 169
Quote: 4
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Abstract


With the development of science and technology, multi-satellite passive location plays a more and more important role in the military and the civil applications. Because passive location system does not emit electromagnetic wave, it has a high concealing and anti-jamming ability. In recent years, passive location shows an irreplaceable role in aviation and navigation, aerospace and electronic warfare, etc. Thus, it obtains more and more widespread concerning from many countries.This paper focuses on passive location and consists of the following parts: satellite locating accuracy analysis, joint time difference of arrival (TDOA) and frequency difference of arrival (FDOA) location algorithm. The main content is as follows:a) To design a good satellite array shape, we describe the derivation process of Cramer-Rao lower bound (CRLB) and Geometric dilution of Precision (GDOP). Then, a typical five-satellite array shape is discussed. Simulation results and discussions show: if the angle between the lines connecting the main satellite and aiding ones is between 45°and 60°, then a better GDOP is achieved.b) To improve the location precision of TDOA or FDOA, we propose a joint location algorithm based on maximum ratio combing (MRC). Simulation results show that this MRC algorithm under earth constraint (EC) can achieves CRLB and perform better than TDOA, FDOA and Ho algorithm regardless of EC.c) Application of Hough Transform (HT) to passive location is deeply studied, and data fusion based on HT is discussed. The simulation results show that the weighted HT has a better location performance than TDOA or FDOA location based on HT.

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