CAJ | 학술논문

无源雷达信号处理中常通过长时间相干积累获取增益以检测微弱目标。但目标高速运动会引起距离徙动及多普勒展宽。现有研究方法可通过 keystone 变换校正径向速度引起的距离徙动，然而目标的切向运动引起的多普勒展宽现象仍会引起能量损失，需对其进行补偿。该文通过推导回波信号模型，分析了目标切向运动引起多普勒展宽的原理，并提出一种基于 RSPWVD-Hough 变换的多普勒展宽补偿方法，针对多目标场景下的处理性能进行了分析。仿真实验及结果分析表明该方法能够针对多目标场景进行多普勒展宽补偿，并得到较好的效果，且适用于微弱目标，因而能够提高系统对微弱目标的探测能力。
무원뢰체신호처리중상통과장시간상간적루획취증익이검측미약목표。단목표고속운동회인기거리사동급다보륵전관。현유연구방법가통과 keystone 변환교정경향속도인기적거리사동，연이목표적절향운동인기적다보륵전관현상잉회인기능량손실，수대기진행보상。해문통과추도회파신호모형，분석료목표절향운동인기다보륵전관적원리，병제출일충기우 RSPWVD-Hough 변환적다보륵전관보상방법，침대다목표장경하적처이성능진행료분석。방진실험급결과분석표명해방법능구침대다목표장경진행다보륵전관보상，병득도교호적효과，차괄용우미약목표，인이능구제고계통대미약목표적탐측능력。
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.