FIFTH
ANNUAL
ASAP '97 WORKSHOP
|
FIFTH
ANNUAL |
A Robust and Efficient |
S.U. Pillai, Y.L. Kim, and J.R. Guerci Dept. of Electrical Engineering Polytechnic University Six Metrotech Center Brooklyn, New York 11201 tel: (718) 260-3732 fax: (718) 260-3906 email: pillai@arma.poly.edu Abstract A new technique for removing dominant interference eigenvectors is presented which does not require that an eigendecomposition be performed-as is the case with the eigencanceler method. Similar to eigen-based cancellation techniques, the resulting space-time pattern is formed by subtracting from the quiescent steering vector, a weighted sum of interference eigenvectors. However, the subtraction is accomplished implicitly, without having to directly estimate the interference eigenvectors. Instead, a subspace projection is formed in the data domain which typically has a dimension an order of magnitude smaller than the total available number of degrees-of-freedom for the space-time array. This new method is ideally suited for nonstationary clutter environments, where only a small sample support is available for the adaptive training set, and where a premium is placed on computational overhead. A detailed analytical comparison between the proposed technique and existing eigen and non-eigen based constrained interference removal techniques is presented. Also, experimental results are presented based on both synthetic and recorded data sets originating from the Mountaintop radar. |
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