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

Abstract

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

CLC Number:

TN959.2+1

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.

Figures/Tables 11

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References 32

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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

Analysis of radar seeker sea-surface echoes at a high grazing angle

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