基于北斗三号导航系统的卫星定位技术

对北斗三号体制下的传输链路、接收门限进行理论分析,得出捕获算法采用4次非相干累加,可以使捕获灵敏度达到-130 dBm,同时实现定位时间小于5 min的综合较优结果.接着以低轨太阳同步轨道卫星为例,利用STK建模进行全轨道周期仿真,结果显示全程收星数超过4颗,定位精度达到2.59 m,速度误差为0.00378 m/s....

Research on satellite positioning technology based on BeiDou-3 navigation satellite system

The transmission link between BeiDou navigation satellites and user satellite, and the relationship between the capture sensitivity and the incoherent accumulation were analyzed. A four time incoherent accumulation was used and capture sensitivity reached -130dBm, together with positioning time less than 5 minutes. Based on the capture sensitivity, a STK model was set up to simulate the number of captured BeiDou navigation satellites for the user satellite whose orbit was of sun synchronous in a full orbital period. The results show that more than 4 satellites could be captured during the full orbital period. Positioning accuracy and speed accuracy are 2.59m and 0.00378m/s respectively. The first test of on-orbit satellite positioning was carried out right after BeiDou navigation satellite system completed deployment at the end of 2020. Six or more visible BeiDou navigation satellites were captured. Positioning accuracy of 2.77m and speed accuracy of 0.006m/s were achieved, showing good consistency with the simulated results. The study proves that the algorithm can be used for satellite positioning applications and that it satisfies the positioning requirement based on Beidou navigation system.