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

摘要: Chaotic-based random stepped frequency signal is applied in the multiple-input-multiple-output through-the-wall detection radar (MIMO-TWDR)recently. When modulation (FM) sequence of transmission controlled by chaotic signal, single-frequency interference such as power harmonics sneaking into phase detector becomes periodical and therefore can be filtered domain. However, target echo after modulation, where matched filter usually unable to realised Fourier transform consequently envelope direct wave varies stochastically difficult eliminated an analogue filter. The FM disorganising cannot meet demand filtering out simultaneously. Therefore, a new method optimisation chaotic-based based on genetic algorithm proposed solve these problems this study. Simulations show that optimised possesses advantages both linear signal. scheme achieves excellent performance suppression detection. Moreover, it avoid between antennas MIMO radar.