高轨辐射源被动雷达空-时积累海面动目标检测技术

被动雷达作为一种特殊的双（多）基雷达体制，具有低成本、反隐身和抗干扰能力强等显著优势；与传统辐射源相比，地球同步轨道（geosynchronous earth orbit， GEO）卫星具有覆盖面积广、重访周期短、地面功率密度高等特性，将其作为辐射源构成高轨辐射源被动雷达，在广域持续隐蔽探测中具有显著优势。本文针对一发多收的高轨辐射源被动雷达系统，为解决多基目标回波的高精度融合问题，提出了一种基于空-时联合积累的高轨辐射源被动雷达海面运动目标检测技术。首先，利用Keystone变换和去调频傅里叶变换实现目标回波能量跨距离单元和跨多普勒单元现象的校正，并将各站目标回波能量积累到多普勒参数域；然后，根据目标角度、距离、多普勒参数与多基构型间的解析形式，建立各站目标回波域、多普勒参数域间各自映射关系，从而解决了多基间目标距离和多普勒参数的差异性问题，完成了多基间目标回波能量的对齐和积累，实现了高轨辐射源被动雷达动目标检测和定位。 

Maritime Moving Target Detection Technique Via Space-Time Integration of Passive Radar with Geosynchronous Illuminator

? ?As a special bi/multi-static radar system， passive radar has significant advantages such as low cost， anti-stealth and strong anti-jamming capabilities. Compared with conventional radiation sources， geosynchronous earth orbit （GEO） satellite is used as the source to form the GEO-based passive radar system， which provides significant advantages such as wide coverage， short revisit period， and relatively high ground power density. This paper focuses on GEO-based passive radar system with one satellite transmitter and multiple receivers. In order to achieve high-precision fusion of multistatic target echoes， this paper proposes a ship target detection technique of GEO-based passive radar based on space-time integration. First， The Keystone transform and dechirp Fourier transform are used to remove the range and Doppler migrations， and accumulate the target echo energy of each receiver into the Doppler parameter domain. Then， according to the target aspect angle， distance， Doppler parameters and the analytical form of the multistatic configuration， the mapping relationship between the target echo domain and Doppler parameter domain of each receiver are established. The alignment and accumulation of target echo energy between multiple baselines are completed by compensating the differences in range and Doppler parameters between multistatic echoes. The detection and localization of the moving target for GEO-based passive radar are realized.