Coherent and non-coherent integration TDOA/FDOA estimation method of frequency-hopping signals

被引：0
|
作者：
Ouyang X. [1 ,2 ]
Yao S. [2 ]
Yang Y. [2 ]
He Q. [2 ]
Wan Q. [1 ]
机构：
[1] School of Information and Communication Engineering, University of Electronic Science and Technology of China, Chengdu
[2] National Key Laboratory of Science and Technology on Blind Signal Processing, Chengdu
来源：
Xi Tong Gong Cheng Yu Dian Zi Ji Shu/Systems Engineering and Electronics | 2021年 / 43卷 / 05期
关键词：
Coherent integration; Frequency difference of arrival (FDOA); Frequency-hopping (FH); Time difference of arrival (TDOA);
D O I：
10.12305/j.issn.1001-506X.2021.05.04
中图分类号：
学科分类号：
摘要：
The carrier frequency of frequency-hopping (FH) signals varies with time, therefore, the FH signals have broad distribution in frequency. And FH signals are continuous in time domain, which have broader distribution in time domain compared to single hop signal. The estimation accuracy of time difference of arrival (TDOA) and frequency difference of arrival (FDOA) is determined by the frequency distribution or time distribution and energy of signal and noise. The TDOA estimation is mainly depended by the frequency distribution, while the FDOA estimation is mainly depended by the time distribution. FH signals have broad distribution in frequency and time domain, the problem of low estimation accuracy for TDOA and FDOA of single hop signal can be overcome through multi-hop coherent integration to improve the use of information in time and frequency domain. Focus on the TDOA/FDOA estimation problem of FH signals, firstly, the cross ambiguity function (CAF) of single hop baseband signal is analyzed, then, the phase difference of each CAF for the multi hop baseband signal is analyzed through TDOA and FDOA dimensions. Coherent integration TDOA/FDOA estimation method of CAF for multi-FH signals is realized by FDOA normalized compensation and phase compensation. When the coherent integration requirements are not satisfied, the non-coherent TDOA/FDOA estimation method of FH signals is proposed. The relationship between performance of two TDOA/FDOA estimation method for FH signals and each parameter for signal are analyzed theoretically. Simulation results show that the performance of proposed coherent integration TDOA/FDOA estimation method for FH signals is best, and the non-coherent integration method is suboptimal, while that of single hop signal is poorest, which proves the correctness of the theory analysis. © 2021, Editorial Office of Systems Engineering and Electronics. All right reserved.
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页码：1184 / 1190
页数：6
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