面向多主瓣干扰的波形与滤波器联合认知设计方法

doi:10.12305/j.issn.1001-506X.2023.11.09

Abstract

Abstract:

Multi-mainlobe jamming and radar echo coincide highly in space, time, frequency, and other dimensions, which seriously weakens radar detection performance. In order to solve the problem of simultaneous interference of chopping and interleaving (C&I), intermittent sampling direct forwarding, and intermittent sampling repeated forwarding, an anti-multi-mainlobe interference method based on joint optimization of transmitting waveform and receiving filter is proposed in this paper. Firstly, C&I, intermittent sampling, and direct forwarding and intermittent sampling repeated forwarding interference signal models is constructed based on constant mode phase coded signal. Then, under the condition that the interference parameters are fully known or biased, the joint optimization problem of transmitting and receiving is established based on the peak level of waveform correlation function, the matching error of main lobe template of correlation function, and the weighting and minimization criteria of interference energy under the constraint of signal to noise ratio (SNR). Then, by using penalty function method, norm transformation, and other methods, the non-convex, non-smooth, and constrained optimization problem is transformed into a minimization problem about the function of independent variables (composed of signal phase, filter amplitude and phase). The iterative limited-memory Broyden-Fletcher-Goldfarb-Shanno (L-BFGS) algorithm is used to solve the problem. Finally, simulation results show that the optimization method can effectively suppress multi-mainlobe interference and sidelobe level to a certain extent, and could control the SNR loss to a certain extent.

Key words: multi-mainlobe jamming, cognitive design, waveform and filter joint design

CLC Number:

TN973

Yu LIN, Yi BU, Xianxiang YU, Guolong CUI. Joint cognitive design method of waveform and filter for multi-mainlobe jamming[J]. Systems Engineering and Electronics, 2023, 45(11): 3437-3448.

Figures/Tables 15

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References 29

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参数	数值
相位编码信号时宽/μs	60
失配滤波器时宽/μs	120
带宽/MHz	5
采样率/MHz	5
雷达频率/GHz	2
相位编码信号长度	300
失配滤波器长度	600

干扰类型	干扰感知情况
干扰类型	干扰参数完全已知		干扰参数存在偏差
C&I干扰	截取段数	5	截取段数	4
	转发次数	5	转发次数	6
	每段点数	12	每段点数	12
间歇采样直接转发	截取段数	5	截取段数	5
	转发次数	1	转发次数	1
	每段点数	8	每段点数	8
间歇采样重复转发	截取段数	5	截取段数	5
	转发次数	4	转发次数	4
	每段点数	4	每段点数	4

参数	信号类型
参数	LFM信号	优化信号1	优化信号2
信号匹配/失配处理后峰值旁瓣电平	-13.47	-29.46	-25.62
信号与C&I干扰相关处理后峰值电平	-13.98	-32.24	-29.67
信号与间歇采样直接转发干扰信号相关处理后峰值电平	-17.5	-34.19	-33.9
信号与间歇重复转发采样干扰信号相关处理后峰值电平	-21.78	-35.62	-32.57
设计过程SNR_loss	0	0.924 2	1.982 7

参数	数值
脉冲个数	100
脉冲重复周期/μs	480
采样率/MHz	5
信噪比/dB	0
干信比/dB	20
目标距离/km	45
目标速度/(m·s^-1)	30
C&I干扰距离/km	46
C&I干扰速度/(m·s^-1)	32
间歇采样直接转发干扰距离/km	44
间歇采样直接转发干扰速度/(m·s^-1)	28
间歇采样重复转发干扰距离/km	48
间歇采样重复转发干扰速度/(m·s^-1)	26

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Joint cognitive design method of waveform and filter for multi-mainlobe jamming

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