DOI: 10.3724/SP.J.1300.2013.13073

Journal of Radars (雷达学报) 2013/2:4 PP.430-438

A Compensation Algorithm Based on a RSPWVD-Hough Transform for Doppler Expansion in Passive Radar

For passive radar, a long integration time is used to achieve high processing gain in order to detect a weak target. As a result, range migration and Doppler expansion may occur for high-speed targets. A keystone transform can be used to rectify range migration introduced by radial velocity. Tangential velocity, however, may lead to Doppler expansion, which entails a loss of integration gain. In this paper, a signal model is presented to analyze the reason for Doppler expansion. A Doppler expansion compensation method is then introduced based on a RSPWVD–Hough transform for a multiple-target scenario. Simulation results show that the proposed method can compensate, with good performance, for the energy loss caused by Doppler expansion in a multiple-target scene. Additionally, results show that the proposed method is also effective for weak targets, and may therefore improve the ability to detect weak targets in passive radar systems.

Key words:Passive radar,Doppler expansion compensation,RSPWVD-Hough transform,Weak target detection

ReleaseDate:2014-07-21 16:59:57