FDA MIMO双基雷达主瓣走动矫正距离模糊杂波抑制

doi:10.12305/j.issn.1001-506X.2022.05.08

Abstract

Abstract:

Under the high repetition rate pulse system, the ground clutter of the side looking multiple input multiple output (MIMO) array bistatic radar system has serious range dependence and clutter spectrum broadening problem. At the same time, the multi-dimensional clutter structure of bistatic radar faces the difficulty of obtaining sufficient training samples and high complexity of adaptive weighting algorithms. In this paper, a range ambiguous clutter suppression method for frequency diversity array (FDA)-MIMO bistatic radar based on transmitting main lobe correction is proposed. This method solves the problem of the main lobe illumination angle movement by correcting the main lobe of the equivalent emission pattern at the receiving end. Through the correction and compensation of the equivalent emission pattern main lobe and the reverse compensation after the received signal, the echo has a phase term of range coupling, which realizes the effective distinction of clutter at different range areas, solves the problem of clutter range ambiguity, and completes clutter suppression. The three-dimensional search is split into the form of "2+1". Firstly, the clutter is suppressed in the emission angle frequency domain and the Doppler domain, and the target parameter search is performed. Then, construct a dimensionality reduction matrix according to the obtained target transmitting angle and Doppler information, and perform dimensionality reduction search in the receiving angle frequency domain, which solves the problem of insufficient clutter samples and large amount of calculation. Finally, this method solves the problem of ground range clutter ambiguity in the large scene of bistatic early warning radar. Simulation experiments verify the effectiveness of the proposed method.

Key words: multiple input multiple output (MIMO) radar, bistatic radar system, frequency diversity array (FDA), range ambiguous clutter suppression

CLC Number:

TN959

Yuzhuo WANG, Shengqi ZHU, Ximin LI, Lan LAN. Range ambiguous clutter suppression for FDA MIMO bistatic radar with main lobe correction[J]. Systems Engineering and Electronics, 2022, 44(5): 1483-1494.

Figures/Tables 16

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References 28

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参数	参数值
发射阵元数	16
接收阵元数	6
参考工作频率/GHz	1.104
信号带宽/kHz	19.478
阵列阵元间距/m	0.054 3
发射阵列速度/(m/s)	140
接收阵列速度/(m/s)	140
目标距离/km	63.2
目标归一化多普勒频率	-0.560
发射机高度/km	6
接收机高度/km	6
双基基线长度/km	50
脉冲重复频率/Hz	2 434.8
相干脉冲数	5
脉冲宽度/s	4.7e-05
频率增量/Hz	1 217.4
目标归一化接收角频率	-0.288
目标归一化发射角频率	0.160

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Range ambiguous clutter suppression for FDA MIMO bistatic radar with main lobe correction

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