联合失配滤波器的近区低旁瓣混沌波形设计算法

doi:10.12305/j.issn.1001-506X.2025.08.09

Abstract

Abstract:

In the field of radar detection, due to the high sidelobe level of linear frequency modulation （LFM） signals near mainlobe, the strong target sidelobes cover the weak targets, which greatly reduces the detection ability of traditional radar for such weak targets. To solve this problem, an optimization method for low sidelobes near the mainlobe of chaotic waveform is proposed. On the basis of the excellent anti-interception and anti-interference ability of chaotic waveform, this method combines the characteristics of low sidelobe level of chaotic waveform, and fully utilizes the spectral characteristics of the dual chaotic signal design and the time-frequency degrees of freedom of the mismatched filter to adjust the energy distribution of the pulse compressed signal. Simulation results show that the designed chaotic waveform has good range resolution, and the sidelobe level in the near mainlobe region after pulse compression by the mismatched filter reaches a low level. It has certain significance for detecting weak targets in close proximity situations.

Key words: weak target detection, low sidelobe, chaotic signal, waveform design, mismatched filter

CLC Number:

TN 959.1

Yingcong LUO, Lei ZHANG, Shaopeng WEI, Zhichao MENG. Joint design algorithm using chaotic waveform and mismatched filter for low sidelobe near mainlobe region[J]. Systems Engineering and Electronics, 2025, 47(8): 2511-2518.

Figures/Tables 11

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参数名称	参数数值
时宽$ {T_{{p}}} $/μs	10
带宽$ {B_{{w}}} $/MHz	100
频谱延拓周期$ {{{f}}_{{\rm{step}}}} $/MHz	20
频谱延拓次数$ {N_s} $	5
频谱合成权重	[0.2828,0.7348,1,0.7348,0.2828]

参数名称	参数数值
权重$ {\lambda _1} $	3
权重$ {\lambda _2} $	1
峰值电平${b_{{\rm{max}}} }$	Ne−1/20
迭代次数	20000
近区旁瓣范围/m	40

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Joint design algorithm using chaotic waveform and mismatched filter for low sidelobe near mainlobe region

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