Waveform Preconditioning for Clutter Rejection in Multipath for Sparse Distributed Apertures

Abstract

The idea of preconditioning transmit waveforms for optimal clutter rejection in radar imaging is presented. Waveform preconditioning involves determining a map on the space of transmit waveforms, and then applying this map to the waveforms before transmission. The work applies to systems with an arbitrary number of transmitand receive-antenna elements, and makes no assumptions about the elements being co-located. Waveform preconditioning for clutter rejection achieves efficient use of power and computational resources by distributing power properly over a frequency band and by eliminating clutter filtering in receive processing.

Time-Reversal Waveform Preconditioning for Clutter Rejection

“…Loosely speaking, W emphasizes the parts of s residing the subspaces in which the signal-to-clutter ratio is high [1].…”

“…1 Consequently, the US Government is authorized to reproduce and distribute reprints for governmental purposes notwithstanding any copyright notation thereon. The views and conclusions contained herein are those of the authors and should not be interpreted as necessarily representing the official policies or endorsements, either expressed or implied, of the Air Force Research Laboratory or the US Government.…”

“…In earlier work we introduced waveform preconditioning of transmit waveforms for optimal clutter rejection [1], [2]. Here we show how preconditioning of transmit waveforms for optimal clutter rejection can be performed using a time-reversal approach.…”