A Method for FDOA Estimation with Expansion of RMS Integration Time

Shangyu ZHANG  Zhen HUANG  Zhenqiang LI  Xinlong XIAO  Dexiu HU  

Publication
IEICE TRANSACTIONS on Communications   Vol.E100-B   No.5   pp.893-900
Publication Date: 2017/05/01
Online ISSN: 1745-1345
Type of Manuscript: PAPER
Category: Sensing
Keyword: 
cross ambiguity function,  frequency difference of arrival,  RMS integration time,  

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Summary: 
The measurement accuracy of frequency difference of arrival (FDOA) is usually determinant for emitters location system using rapidly moving receivers. The classic technique of expanding the integration time of the cross ambiguity function (CAF) to achieve better performance of FDOA is likely to incur a significant computational burden especially for wideband signals. In this paper, a nonconsecutive short-time CAF's methods is proposed with expansion of root mean square (RMS) integration time, instead of the integration time, and a factor of estimation precision improvement is given which is relative to the general consecutive method. Furthermore, by analyzing the characteristic of coherent CAF and the influence of FDOA rate, an upper bound of the precision improvement factor is derived. Simulation results are provided to confirm the effectiveness of the proposed method.