摘要
针对多星时差频差定位系统时/频同步要求高、多星测向定位系统复杂等问题,提出一种多星多普勒频率变化率的无源定位体制,每颗卫星仅需单个接收天线和通道,且多星之间无需高精度时/频同步。针对定位观测量与辐射源位置的高度非线性,提出一种基于多普勒频率的多假设非线性最小二乘(MH-NLS)无源定位算法。理论推导了定位估计的克拉美-罗下限(CRLB),基于定位误差的几何分布(GDOP)分析了多星构型对定位误差的影响。计算机仿真分析表明,基于多普勒频率变化率的MH-NLS算法得到的定位误差能够达到CRLB。
Due to the high precision synchronization requirements in TDOA/FDOA localization and the system complexity in DOA localization by multiple satellites,a new passive localization system using Doppler frequency rate-of-change-only is proposed.A single receiving channel is needed for each satellite and the synchronization requirement is lower.To solve the high nonlinear between the measurement and the unknown position,a multiple hypothesis nonlinear least square（MH-NLS）localization algorithm for Doppler rate is presented.The theoretical derivation of Cramer-Rao lower bound（CRLB）is derived and the relation between the error and the satellite geometry is also analyzed via geometrical dilution of precision（GDOP）.The computer simulation shows that the proposed algorithm can approach to the CRLB.
作者
马永圣
张敏
郭福成
Ma Yongsheng Zhang Min Guo Fucheng(College of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, Hunan, China)
出处
《航天电子对抗》
2017年第4期17-21,56,共6页
Aerospace Electronic Warfare
基金
上海航天科技创新基金(SAST2015028)
装备预研基金(9140A21040115KG01001)
关键词
无源定位
多星
多普勒变化率
克拉美-罗下限
passive localization
multiple satellites
Doppler rate-of-change
CRLB
