利用旋转多普勒的单站无源定位性能分析  

Performance Analysis of Passive Localization Utilizing Rotational Doppler-Based Single Observer

作　　者：李腾[1] 郭福成[1] 姜文利[1] 

机构地区：[1]国防科技大学电子科学与工程学院,长沙410073

出　　处：《宇航学报》2010年第10期2388-2394,共7页Journal of Astronautics

基　　金：国家自然科学基金(60702010)

摘　　要：针对只测相位差变化率无源定位问题,提出了一种利用旋转多普勒的单站无源定位体制。该体制利用两接收天线构成长基线干涉仪(LBI),不但利用干涉仪平动带来的相位差变化率信息,还利用干涉仪自身转动引入的相位差变化率信息。从定位线特性的角度分析了该定位体制的原理,并推导了定位误差的克拉美-罗下限(CRLB)。理论分析和计算结果表明,通过干涉仪转动,能够提高定位精度,且干涉仪转动越快、基线方向变化范围越大,定位性能越好。To deal with the problem of passive localization using phase difference rate of change only,a new passive localization system is proposed by utilizing rotational Doppler-based single observer. A long baseline interferometer （ LBI） is formed by two antennas. Not only the information of phase difference rate of change brought by translation but also by rotation of the LBI are used. The principle of this system is analyzed in respect to characteristics of location lines,and the Cramer-Rao lower bound of localization errors is derived. Theoretical analysis and computational results indicate that localization accuracy can be improved through LBI rotating,moreover,the faster the LBI rotates and the larger aspect range of the baseline varies in,the better the performance will be.

关 键 词：旋转多普勒 无源定位 干涉仪 相位差变化率 

分 类 号：TN97[电子电信—信号与信息处理]