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Investigation of Passive Location Techniques Based on OFDM Signal

Author: YangGuoQing
Tutor: DengPing
School: Southwest Jiaotong University
Course: Communication and Information System
Keywords: Passive Location OFDM timing synchronization TDOA location
CLC: TN919.3
Type: Master's thesis
Year: 2008
Downloads: 233
Quote: 1
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Abstract


In recent years, the use of radio and television signals and other civilian signal as irradiation source passive radar systems due to its wide coverage, good for hiding , anti-stealth and the ability of anti - low-altitude raid received wide attention and rapid development . Orthogonal frequency division multiplexing (OFDM) technology due to its good anti- noise anti- multipath interference and high spectrum efficiency advantages are widely used in digital broadcasting ( DAB ) , digital television ( DVB ) , wireless local area network (WLAN) technology and become one of the core technology of next-generation wireless communication system . In this paper, a combination of both passive location technology based on OFDM modulation digital broadcast television signals . First of all, the papers in the inspection , analysis on the basis of relevant literature introduced passive positioning technology research status at home and abroad , to discuss the classification of passive location and technology , focusing on narrative research direction in recent years in the area representative and content. Second , the article describes the basic principles of OFDM , key technology and its applications in DAB , DVB , discussed the impact of synchronization errors on system performance , OFDM receiver system needs to have a higher frequency and timing accuracy , it can be based on OFDM accurate timing estimation of the signal the arrival time of the measurement signal to be applied to the the ranging part in the passive location . OFDM system timing estimation and measurement principles ranging in nature , the paper then focuses on the frequency of the training sequence based on cyclic prefix and guide two types of timing synchronization method and its application in ranging , respectively, of two class algorithm and the improved algorithm . Finally, build a passive positioning system model , derived two Passive TDOA location algorithm applied to the model of three-dimensional space , and the positioning performance of the algorithm was simulated to verify the effectiveness of the algorithm .

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