四星时差定位中的卫星构型及其定位性能  

Constellation Configuration and Its Performance Based on TDOA with Four Satellites

作　　者：顾黎明[1] 赵砚[2] 朱建丰[1] 缪善林[1] 

机构地区：[1]中国电子科技集团公司第三十六研究所,浙江嘉兴314033 [2]清华大学电子工程系,北京100084

出　　处：《电讯技术》2017年第1期33-38,共6页Telecommunication Engineering

摘　　要：针对目前多星联合定位研究中对卫星覆盖区域无法长时间高精度定位的问题,提出了一种新型的四星星座构型,并在STK软件中得到了实现。推导了在地球约束情况下基于四星时差定位的误差模型,对卫星全球飞行过程中星座构型变化时的定位性能进行了仿真。仿真结果表明,新型四星星座可以实现在卫星全球飞行过程中对覆盖区域保持高精度定位,在时差测量误差为50 ns且不考虑卫星位置误差的情况下,定位误差在±45°波束范围内优于1.5 km,对多星联合定位技术在工程设计应用上具有重要意义。To solve the problem of long-time high-precision location in multi-satellite passive location,a new satellite configuration including four satellites is presented and implemented by using Satellite Tool Kit（STK）. The model of locating error with earth restraint is deduced,and the location performance in differ-ent position is simulated. The analysis shows that the new satellite configuration can implement long-time high-precision location,and the geometrical dilution of precision（ GDOP） is less than 1. 5 km in ±45° range while the error of time difference measurement is 50 ns without the error of satellite locations. The conclusions can be a reference for multi-satellite passive location.

关 键 词：无源定位 星座构型设计 到达时间差 定位误差几何稀释 

分 类 号：TN971.3[电子电信—信号与信息处理]