A sampling-based approach to wideband interference cancellation

Document Type

Article

Publication Date

12-1-1998

Abstract

Classical adaptive array schemes which use only complex spatial weights are inherently narrowband and consequently perform poorly when attempting to suppress wideband interference. The common solution to this problem is the use of tapped delay line filters in each spatial channel to facilitate space-time adaptive processing (STAP). The higher performance provided by the STAP architecture comes at the cost of a considerable increase in complexity. This paper presents a simpler technique based on programmable time adjustable sampling (TAS) that provides a limited number of wideband degrees of freedom. Two TAS methods are introduced: TAS-sidelobe canceler (TAS-SLC) is based on the sidelobe canceler, while TAS-minimum variance beamformer (TAS-MVB) is derived from the minimum variance bearaformer. TAS is implemented by adjusting the sampling instant at selected array channels. TAS-SLC consists of controlling the sampling in the main channel of the sidelobe canceler. With TAS-MVB array complex weights are substituted with TAS time delays. The performance of TAS methods with wideband interference is compared to the conventional sidelobe canceler and minimum variance beamformers. It is shown that TAS-SLC provides better performance than the sidelobe canceler, while TAS-MVB outperforms the minimum variance beamformer. © 1998 IEEE.

Identifier

0031673271 (Scopus)

Publication Title

IEEE Transactions on Aerospace and Electronic Systems

External Full Text Location

https://doi.org/10.1109/7.640256

ISSN

00189251

First Page

2

Last Page

12

Issue

1

Volume

34

Grant

N62269-93-C-0536

Fund Ref

Naval Surface Warfare Center

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