| 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。 |
| 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 |
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| 基金项目: |
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| Constellation configuration and its performance based on TDOA with four satellites |
| GU Liming,ZHAO Yan,ZHU Jianfeng,MIAO Shanlin |
| () |
| Abstract: |
| 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 different 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. |
| Key words: passive location constellation configuration design time difference of arrival(TDOA) geometrical dilution of precision(GDOP) |
