联合最小方差与最大似然谱估计的前视成像方法

doi:10.12305/j.issn.1001-506X.2023.10.14

Abstract

Abstract:

Forward-looking imaging technique can be used on phased array radar to detect and track the targets in front of the high speed motion platform. To solve the problem of discriminating the targets in the beamwidth, a forward-looking imaging method by integrating minimum variance and maximum likelihood spectrum estimation is proposed. Firstly, the approach of scanning the beam is used. The initial two-dimensional range-azimuth image is created with minimum variance spectrum estimation. Secondly, the regions in which the amplitude peaks exceed the threshold are searched to implement the second estimation. Simulation results have demonstrated the effectiveness of the approach to improve the targets'resolution capability in the applications involving correlated signals and low signal-to-noise ratios.

Key words: forward-looking imaging, spectrum estimation, discrimination, maximum likelihood

CLC Number:

TN957.52

Shengxiang ZHU, Min HE, Zhiyi HE, Jiaxin WANG. Forward-looking imaging method by integrating minimum variance and maximum likelihood spectrum estimation[J]. Systems Engineering and Electronics, 2023, 45(10): 3108-3115.

Figures/Tables 13

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参数	取值
检测概率	0.9
虚警概率	1e-6
工作频率/GHz	10
采样率/MHz	30
脉冲重复频率/kHz	12.5
距离分辨率/m	10
扫描角度/(°)	-7~7
扫描步长/(°)	0.1

算法	单次搜索乘法	单次搜索加法	搜索次数	其他运算
ML2	N²	N²－N	(M²－M)/2	无
ML3	N²	N²－N	(M³－3M²+2M)/6	无
MUSIC2	2N²－3N－2	3N²－11N+10	M	特征值分解O(N³)
MUSIC3	2N²－5N－3	3N²－14N+15	M	特征值分解O(N³)

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Forward-looking imaging method by integrating minimum variance and maximum likelihood spectrum estimation

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