Multichannel SAR wide-swath imaging based on adaptive removal of azimuth ambiguities

Abstract

By exploiting the direction of arrival (DoA) information of azimuth ambiguity, an innovative algorithm for the adaptive suppression of azimuth ambiguity for multichannel synthetic aperture radar (SAR) wide-swath imaging is presented. It firstly estimates the DoA value of each azimuth component within a Doppler cell using the efficient noise subspace-based iterative estimation technique. Then the spatial filter for sequentially extracting the desired azimuth component is derived, which is designed to be used with the newly estimated DoA information within each Doppler bin. Finally, the azimuth ambiguities can be suppressed via the implementation of spatial filtering. The proposed approach is robust to aircraft velocity errors, and its effectiveness is validated via simulation results.

Additional information

Funding

This work was supported in part by the National Natural Science Foundation of China [grant number 61201459], [grant number 61301212]; Natural Science Foundation for Young Scholars of Jiangsu Province of China [grant number BK2012408]; Chinese Universities Scientific Foundation[grant number 2012B06014].