大掠射角对海雷达导引头实测回波特性分析

doi:10.12305/j.issn.1001-506X.2024.05.08

摘要/Abstract

摘要：

大掠射角下，对海雷达导引头观测到的海杂波强度激增, 舰船目标检测困难。本文结合全极化雷达导引头挂飞实测数据, 分析了回波幅度和相位特性。首先, 采用典型分布对回波幅度分布进行拟合, 并利用拟合优度对拟合效果作出评估; 然后, 分析了平均相位变化量。结果表明: 在大掠射角条件下, 雷达导引头各极化通道海杂波幅度服从K分布; 海杂波与舰船回波幅度在同极化通道服从K分布, 在交叉极化通道服从对数正态分布; 交叉极化通道回波信杂比高于同极化通道; 海杂波与舰船回波相位平均变化量小于海杂波。

关键词: 雷达导引头, 海杂波, 大掠射角, 幅度分布, 相位变化

Abstract:

The sea clutter intensity observed by the sea radar seeker at a high grazing angle increases sharply where ship-detection performance can be a problem. The analysis in this paper describes the amplitude and phase characteristics of radar echoes based on measured data collected by airborne radar seekers. Firstly, the data are fitted to commonly used probability distribution functions respectively, and then the goodness of fit is used to obtain the optimal distribution model. Finally, the average phase difference is analyzed. The results show that the K distribution is a good fit for sea-clutter data at a high grazing angle, the K distribution is a good fit for the co-polarization ship echoes plus sea clutter data, the Log-normal distribution is a good fit for the cross-polarization ship echoes plus sea clutter data, the signal-to-clutter ratio for the cross-polarization is higher than the co-polarization, the average phase difference of ship echoes plus sea clutter is smaller than sea clutter.

Key words: radar seeker, sea clutter, high grazing angle, amplitude distribution, phase change

中图分类号:

TN959.2+1

连静, 杨勇, 谢晓霞, 王雪松. 大掠射角对海雷达导引头实测回波特性分析[J]. 系统工程与电子技术, 2024, 46(5): 1535-1543.

Jing LIAN, Yong YANG, Xiaoxia XIE, Xuesong WANG. Analysis of radar seeker sea-surface echoes at a high grazing angle[J]. Systems Engineering and Electronics, 2024, 46(5): 1535-1543.

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幅度分布模型	HH通道		HV通道		VH通道		VV通道
幅度分布模型	p	D	p	D	p	D	p	D
Rayleigh分布	3e-9	0.041 7	7.6e-15	0.053 3	4.4e-12	0.048 0	3.6e-23	0.067 0
Log-normal分布	1.3e-30	0.077 1	1.9e-24	0.068 8	2.6e-20	0.062 6	6.9e-35	0.082 4
Weibull分布	5.4e-17	0.057 2	2.6e-19	0.061 0	2.2e-19	0.061 2	8.6e-23	0.066 4
K分布	1.9e-12	0.048 7	3.9e-7	0.036 4	7.2e-9	0.040 8	2.7e-11	0.046 3

幅度分布模型	极化通道
幅度分布模型	HH通道	HV通道	VH通道	VV通道
Rayleigh分布	0.116 6	0.014 9	0.023 9	0.136 9
Log-normal分布	-0.077 7	-0.008 9	-0.006	-0.039 1
Weibull分布	0.038 9	-0.003	0.003	0
K分布	0	-0.006	0	0

幅度分布模型	HH通道		HV通道		VH通道		VV通道
幅度分布模型	p	D	p	D	p	D	p	D
Rayleigh分布	6.6e-5	0.036 4	6e-34	0.099 7	1.3e-37	0.105	1.1e-6	0.043 1
Log-normal分布	3.8e-23	0.082 1	7.3e-33	0.098 1	1.4e-12	0.06	1e-27	0.090 0
Weibull分布	3.6e-9	0.050 9	3e-112	0.182 0	4.8e-64	0.137 3	3.4e-19	0.074 6
K分布	2.4e-9	0.051 4	2e-117	0.186 2	3.8e-67	0.140 7	4.5e-16	0.068 1

幅度分布模型	极化通道
幅度分布模型	HH通道	HV通道	VH通道	VV通道
Rayleigh分布	0.149 7	0.139 1	0.159 3	0.118 4
Log-normal分布	0	0.009 9	0	-0.059 2
Weibull分布	0.089 8	0.019 9	0.01	0.029 6
K分布	0.059 9	0.009 9	0	-0.029 6

距离单元	极化通道
距离单元	HH通道	HV通道	VH通道	VV通道
海杂波	0.82	0.78	0.82	0.82
舰船回波	0.43	0.51	0.51	0.43
第590个距离单元	0.20	0.39	0.13	0.19