极化合成孔径雷达有源干扰的干信比方程

doi:10.12305/j.issn.1001-506X.2021.12.16

摘要/Abstract

摘要：

对极化合成孔径雷达(polarimetric synthetic aperture radar, PolSAR)实施有效的电子干扰是合成孔径雷达电子对抗领域的重要课题。针对PolSAR电子干扰的基本原理, 首先推导出了接收机输出端和成像处理后的PolSAR方程, 并与极化散射矩阵联系起来, 完整地描述了不同极化状态组合下的信噪比和杂噪比; 然后构建了PolSAR接收机输出端的干扰方程以及成像处理后的非相干、部分相干和完全相干干扰方程, 总结了PolSAR电子干扰有效功率的能量分配与守恒规律; 最后基于上述方程论证了不同极化配置对PolSAR干扰的效果。对于PolSAR电子干扰技术研究和相关装备研制具有重要的理论指导意义。

关键词: 极化合成孔径雷达, 有源干扰, 干扰方程, 极化散射矩阵

Abstract:

Effective electronic jamming on polarimetric synthetic aperture radar (PolSAR) is an important issue in the field of SAR electronic countermeasures. The basic principles of electronic jamming on PolSAR is established in this paper. Firstly, the PolSAR equations at the output of the receiver and after imaging processing are derived, which are connected with the polarimetric scattering matrix to fully describe signal-to-noise ratio (SNR) and clutter-to-noise ratio (CNR) under different combinations of polarization states. Secondly, PolSAR jamming equations at the output of the PolSAR receiver and after imaging processing are constructed for the incoherent, partially coherent and fully coherent jamming. The energy distribution and conservation rules of the effective power of the PolSAR electronic jamming are summarized. Finally, the jamming performances under different polarization configurations are discussed. These research works have important theoretical guiding significance for developing technologies and equipments of electronic jamming on PolSAR.

Key words: polarimetric synthetic aperture radar (PolSAR), active jamming, jamming equation, polarimetric scattering matrix

中图分类号:

TN957

牛朝阳, 王建涛, 胡涛, 刘伟, 李润生. 极化合成孔径雷达有源干扰的干信比方程[J]. 系统工程与电子技术, 2021, 43(12): 3542-3551.

Chaoyang NIU, Jiantao WANG, Tao HU, Wei LIU, Runsheng LI. Interference signal ratio equation of polarimetric synthetic aperture radar active jamming[J]. Systems Engineering and Electronics, 2021, 43(12): 3542-3551.

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参数	数值
光速c/(m/s)	3×10⁸
雷达中心频率F_c/GHz	5.4
脉冲宽度τ/μs	6
脉冲重复频率F_r/kHz	2.4
雷达系统带宽B/MHz	200
雷达天线方位向孔径长度D/m	20
雷达发射和接收天线的功率增益G/dB	50
雷达接收机系统损耗L_s/dB	3
雷达信号峰值功率P_t/W	2 000
雷达接收机系统噪声温度T₀/K	300
雷达接收机系统噪声系数F_n/dB	3
雷达平台速度v/(km/s)	7.8
雷达平台高度H/km	800
目标到雷达之间的距离R/km	1 200
雷达与目标之间的双程链路损耗L_a/dB	10
干扰机与雷达之间波束角θ_j/(°)	5
雷达接收天线在干扰机方向的增益G(θ_j)/dB	10
干扰机天线增益G_j/dB	30
干扰机至雷达之间的链路损耗L_j/dB	9.5
带宽失配系数K_f	1
多普勒频谱失配系数K_d	1

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