首页 >  2009, Vol. 13, Issue (2) : 238-245

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10.11834/jrs.20090244

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可适应阵列误差和非均匀杂波环境的多通道SAR图像域STAP方法
国防科学技术大学,电子科学与工程学院,湖南 长沙 410073
摘要:

多通道SAR图像域STAP方法是一种利用了长相干积累时间的STAP方法,其杂波抑制和运动目标检测能力强.但是,目前的多通道SAR图像域STAP方法均是在理想条件下给出的,没有考虑阵列误差和非均匀杂波环境对其性能的影响.文中分析了阵列误差和非均匀杂波环境的影响,提出了一种可适应阵列误差和非均匀杂波环境的多通道SAR图像域STAP方法.基于实测杂波数据的实验验证了所提方法的正确性.

A new image domain STAP method for multi-channel SAR with array distortion and non-homogeneity environments
Abstract:

Themulti-channel SAR image domain STAP methods, with a long coherent processing time, can achieve very high performance of clutter restrain andmoving targetdetection. However, the array distortion and non-homogeneity environments have notbeen taken into consideration in the existing image domain STAPmethods. This paper studies their influence on the performance of the image domain STAP, and then proposes a new multi-channel SAR image domain STAP method that can cope with array distortion and non-homogeneity environments. The introducedmethod firstapplies the PowerSelection and Training (PST) method to select the training data, and then proposes anew Improved Sample Matrix Inversion (ISMI) method to remove themoving targets in the training data.With the training data eliminating the moving targets, the covariance matrix of the clutter is estimated.Afterwards the array distortion is estimated based on the covariance matrix, and the array distortion is calibrated later during the image domain STAP processing. The experiments based on real clutterdata prove the validity of the introducedmethod.

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