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A Novel Long‐Time Accumulation Method for Double‐Satellite TDOA/FDOA Interference Localization
Author(s) -
Wu Risheng,
Zhang Yixiong,
Huang Yanan,
Xiong Jinyi,
Deng Zhenmiao
Publication year - 2018
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1002/2017rs006389
Subject(s) - fdoa , multilateration , signal (programming language) , computer science , interference (communication) , ambiguity function , algorithm , carrier to noise ratio , mathematics , signal to noise ratio (imaging) , telecommunications , acoustics , physics , channel (broadcasting) , radar , waveform , node (physics) , programming language
Abstract In double‐satellite interference localization system, the position of the interference source is computed by estimating the time difference of arrival (TDOA) and the frequency difference of arrival (FDOA) between the signals retransmitted by two satellites. The traditional cross ambiguity function (CAF)‐based TDOA/FDOA estimation method requires the constant TDOA/FDOA between the two received signals, which can be satisfied only when the signal length is short. Therefore, the CAF estimation method cannot be applied in long‐time accumulation (LTA). To solve this problem, a novel LTA method is proposed based on signal segmentation. In the proposed method, the two received signals are first divided into several short signal segments. Subsequently, the TDOA, the initial FDOA, and the FDOA change rate of each signal segment are estimated by a modified CAF method. After compensating the FDOA difference between the signal segments, the results are spliced again to form a complete signal without FDOA variation. Consequently, the signal energy can be concentrated and the estimation accuracy of FDOA can be improved. Experimental results of real data demonstrate that greater signal‐to‐noise ratio (SNR) gain is achieved by the proposed method, compared to the traditional CAF‐based method.