LFM-DPC抗间歇采样转发干扰波形集设计算法

doi:10.12305/j.issn.1001-506X.2025.07.09

Abstract

Abstract:

In response to the degradation of radar pulse compression performance due to false targets caused by interrupted sampling repeater jamming (ISRJ) and Doppler frequency shift caused by motion of high-speed target, a design method for high Doppler tolerance waveform set which is based on the composite modulation of linear frequency modulation-discrete phase coding (LFM-DPC) is proposed. Within a certain range of Doppler frequency shifts, the optimization model is formulated by minimizing the sidelobe energy of the auto ambiguity function of the unrepeated signal and the energy of the cross-ambiguity function between the unrepeated signal and the repeated signal. Then an iterative algorithm based on the KKT (Karush-Kuhn-Tucker) optimality condition is designed to solve the model. Simulation experiments show that compared to genetic algorithm (GA) and single modulation LFM signal and DPC signal, the LFM-DPC waveform set designed by the iterative optimization algorithm based on KKT optimality conditions has better performance in anti-ISRJ.

Key words: interrupted sampling repeater jamming (ISRJ), linear frequency modulation and discrete phase coding (LFM-DPC) waveform set, Doppler tolerance, KKT (Karush-Kuhn-Tucker) condition, ambiguity function

CLC Number:

TN95

Qiaolong DONG, Siqi LIU, Weijian ZHANG, Jindong ZHANG. LFM-DPC waveform set design algorithm against interrupted sampling repeater jamming[J]. Systems Engineering and Electronics, 2025, 47(7): 2154-2164.

Figures/Tables 12

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算法	相位数	GA	KKT	差值
AAF-ASL	K=4	-46.52	-47.06	0.54
	K=8	-46.72	-48.95	2.23
	K=16	-46.46	-50.49	4.03
CAF-AL	K=4	-49.52	-51.37	1.85
	K=8	-49.36	-53.10	3.74
	K=16	-49.67	-54.41	4.74

算法	波形数量	GA	KKT	差值
AAF-ASL	M=3	-44.71	-46.03	1.32
	M=4	-46.72	-48.95	2.23
	M=5	-47.16	-49.97	2.81
CAF-AL	M=3	-48.51	-51.30	2.79
	M=4	-49.36	-53.10	3.74
	M=5	-50.46	-54.62	4.16

参数	数值
载频/GHz	15
目标径向距离/km	d₁=15, d₂=16.2
目标径向速度/(m/s)	v₁=100, v₁=－200
目标回波强度/dB	β₁=0, β₂=－5
干扰机位置/km	d_j=16.8
转发干扰延迟时间/μs	1.5
信噪比/dB	20
信干比/dB	-15

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LFM-DPC waveform set design algorithm against interrupted sampling repeater jamming

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