Normalized matched filter—a low rank approach

Details Normalized matched filter—a low rank approach Normalized matched filter—a low rank approach

2005-10-13

2008-08-05

Pihulic, Daniel (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Clutter elimination

Statutory Invention Registration

active

H0002222

ABSTRACT:
This invention addresses the problem of radar target detection in severely heterogeneous clutter environments. Specifically, we present the performance of the normalized matched filter test in a background of disturbance consisting of clutter having a covariance matrix with known structure and unknown scaling plus background white Gaussian noise. It is shown that when the clutter covariance matrix is low rank, the (LRNMF) test retains invariance with respect to the unknown scaling as well as the background noise level and has an approximately constant false alarm rate (CFAR). Therefore, a technique known as self-censoring reiterative fast maximum likelihood/adaptive power residue (SCRFML/APR) is developed to treat this problem and its performance is discussed. The SCRFML/AP method is used to estimate the unknown covariance matrix in the presence of outliers. This covariance matrix estimate can then be used in the LRNAMF or any other eigen-based adaptive processing technique.

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Rangaswamy et al. “Low Rank Adaptive Signal Processing for Radar Applications”. IEEE International Conference on Acoustics, Speech, and Signal Processing, 2004. May 17-21, 2004. vol. 2. pp. ii-201-204.

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