机载相控阵雷达灵巧干扰信号模型及抑制方法研究0

doi:10.12305/j.issn.1001-506X.2021.02.08

Abstract

Abstract:

At present, the research on smart jamming mainly focuses on conventional ground radar, there are few studies on the jamming model and its suppression method under airborne radar. The space-time signal models of three typical smart jammings including noise convolution jamming, random frequency-shift jamming and time-delay repeater jamming under the background of airborne radar are established. Then, the distribution characteristics and the internal mechanism that affects the performance of space-time adaptive processing (STAP) are analyzed from the perspectives of clutter freedom degrees, space-time power spectrum and range-Doppler spectrum. On this basis, a simultaneous clutter and jamming suppression method for airborne radar based on the smallest of cell average detection is proposed. The method accurately estimates the jamming direction from the perspective of clutter space-time power spectrum and forms an jamming auxiliary beam accordingly. Finally, the effective suppression of jamming and clutter is achieved through STAP. The simulation results show that compared with the traditional cascade suppression method, the proposed method improves the suppression performance of time-delay repeater smart jamming by more than 5 dB, which verifies the effectiveness of the proposed method.

Key words: airborne phased array radar, noise convolution jamming, random frequency-shift jamming, time-delay repeater jamming, jamming suppression

CLC Number:

TN957

Wei CHEN, Jijian ZHANG, Wenchong XIE, Yongliang WANG. Research on smart jamming signal model and suppression method for airborne phased array radar[J]. Systems Engineering and Electronics, 2021, 43(2): 343-350.

Figures/Tables 10

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References 27

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干扰类型	脉压增益	杂波自由度增加数目	距离-多普勒谱图	特性
压制噪声干扰	1	N_j(K-1)	距离和多普勒均连续分布	时域白化,空域相关
噪声卷积干扰	(T_n+τ)/(T_n+1/B)	N_j(K-1)	距离离散,多普勒连续	时域白化,空域相关
随机移频干扰	Bτ(1-\|Δf_j\|/B)	N_j	距离和多普勒均离散分布	时域部分相关,空域相关
延时转发干扰	Bτ	N_j	距离和多普勒均离散分布	时域相关,空域相关

参数	物理量	数值
系统参数	载机高度H/km	8
	载机速度V/m/s	140
	阵元数N/个	4×16
	脉冲数K/个	16
	脉冲重复频率f_r/Hz	4 869.6
	接收机带宽B/MHz	5
	脉冲宽度τ/μs	15
	波长λ/m	0.23
	主波束方位角θ₀/(°)	90
干扰机参数	干扰机距离R_j/km	370
	归一化空间频率f_sj	0.1
	功率谱密度S_j/W/Hz	10^-3
噪声卷积干扰	干扰数目/个	3
噪声卷积干扰	卷积噪声长度T_n/μs	15
随机移频干扰	干扰数目/个	3
	单个干扰包含的假目标数目/个	50
	移频范围f_j/Hz	-200~200
延时转发干扰	干扰数目/个	3
	单个干扰包含的假目标数目/个	50
	归一化多普勒频率	0.3

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Research on smart jamming signal model and suppression method for airborne phased array radar

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