Ultrawide-band coherent processing

In this paper, we develop an approach for estimating the ultrawide-band (UWB) radar signature of a target by using sparse subband measurements. First, we determine the parameters of an appropriate signal model that best fits the measured data. Next, the fitted signal model is used to interpolate between and extrapolate outside of the measurement subbands. Standard pulse-compression methods are then applied to provide superresolved range profiles of the target. The algorithm can automatically compensate for lack of mutual coherence between the radar subbands, providing the potential for UWB processing of real-world radar data collected by separate wide-band radars, because the processing preserves the phase distribution across the measured and estimated subbands, extended coherent processing can be applied to the UWB compressed radar pulses to generate superresolved radar images of the target. Applications of this approach to static test range and field data show promising results.