NDLI: FM sequence optimisation of chaotic-based random stepped frequency signal in through-the-wall radar

Content Provider	IET Digital Library
Author	Quan, Yinghui Li, Yachao Hu, Wen Zhai, Yadi Xing, Mengdao
Abstract	Chaotic-based random stepped frequency signal is applied in the multiple-input-multiple-output through-the-wall detection radar (MIMO-TWDR)recently. When the frequency modulation (FM) sequence of transmission signal is controlled by the chaotic signal, the single-frequency interference such as the power harmonics sneaking into the phase detector becomes periodical and therefore can be filtered in frequency domain. However, the target echo signal becomes random after chaotic modulation, where the matched filter usually is unable to be realised by Fourier transform and consequently the envelope of direct wave after the phase detector varies stochastically and is difficult to be eliminated by an analogue filter. The FM sequence of random disorganising cannot meet the demand of filtering out the single-frequency interference and direct wave simultaneously. Therefore, a new method of FM sequence optimisation of chaotic-based random stepped frequency signal based on genetic algorithm is proposed to solve these problems in this study. Simulations show that the optimised stepped frequency signal possesses the advantages of both chaotic-based random and linear stepped frequency signal. The proposed scheme achieves excellent performance on direct wave and single-frequency interference suppression and target detection. Moreover, it can avoid the interference between transmission antennas of MIMO radar.
Starting Page	830
Ending Page	837
Page Count	8
ISSN	17519675
Volume Number	11
e-ISSN	17519683
Issue Number	Issue 7, Sep (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-spr/11/7
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-spr.2015.0565
Journal	IET Signal Processing
Publisher Date	2017-04-28
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Chaotic-based Random Stepped Frequency Signal FM Sequence Optimisation Fourier Transform Frequency Modulation Sequence Genetic Algorithm High-range Doppler Resolution Matched Filter MIMO Radar Multiple-input-multiple-output Through-the-wall Detection Radar Optimisation Technique Phase Detector Power Harmonics Radar Equipment Radio-frequency Immunity Single-frequency Interference System And Application Through-the-wall Radar Transmission Antenna Transmission Signal
Content Type	Text
Resource Type	Article
Subject	Signal Processing Electrical and Electronic Engineering

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