低轨双星无源定位算法及定位精度分析  

Low orbit dual-satellites passive location algorithm and its precision analysis

作　　者：张勇[1] 盛卫东[2] 郭福成[2] 周伯昭[1] 

机构地区：[1]国防科技大学航天与材料工程学院,长沙410073 [2]国防科技大学电子科学与工程学院,长沙410073

出　　处：《中国惯性技术学报》2007年第2期188-192,共5页Journal of Chinese Inertial Technology

基　　金：总装备部"十五"国防预研项目(41309020101)

摘　　要：针对空间电子侦察卫星对地面固定辐射源进行无源定位的问题,研究并提出了一种通过低轨双星联合利用到达时间差(TDOA)和到达频率差(FDOA)无源定位的解析计算方法。通过公式推导和替换,该算法将原本复杂的时差、频差定位方程组化简为简单的6次实系数多项式方程,极大地降低了原方程组的计算复杂度。文章还推导了目标的定位误差几何稀度(GDOP)与时差测量精度、频差测量精度的关系。仿真结果表明,当参数测量的精度很高时,该算法能够准确地对地面目标定位;对比GDOP与参数测量精度的关系还发现,测频误差对低轨双星定位误差的影响较大。Abstract： for electronic reconnaissance using TDOA（time difference of arrival） and FDOA（frequency difference of arrival） was studied and presented which locates ground emitter from space satellites. By the formulae deducing and substituting, this algorithm changes the complex equations set into a simple 6-order polynomial with real coefficient. The relationship between GDOP（geometric dilution of precision） and TDOA error and FDOA error was also analyzed. Simulation results show that an emitter can be located correctly when measurement errors are low, and the frequency measurement error has large effects on the location error of dual satellites location.

关 键 词：卫星 无源定位 时差 频差 

分 类 号：U666.1[交通运输工程—船舶及航道工程]