Bistatic Doppler-SAR DPCA imaging of ground moving targets

Abstract

This paper presents a theory for moving target imaging using two channel Doppler synthetic aperture radar (SAR). Doppler-SAR is a novel SAR modality that transmits ultra-narrowband waveforms. It reconstructs high resolution images by backprojecting data onto the high resolution iso-Doppler contours provided by ultra-narrowband waveforms. We present a novel method to detect/image moving targets by combining the displaced phase center antenna technique with Doppler-SAR. The displaced phase center antenna technique has the distinct advantages of removing the response from stationary targets (clutter) by subtracting images formed by each channel. We present numerical results to demonstrate our theory. This novel method can be used for passive imaging of moving targets embedded in clutter using sources of opportunity transmitting ultra-narrowband waveforms, such as TV and radio stations.