极区北斗三号与GPS定位性能仿真分析

Simulation analysis of BDS-3 and GPS positioning performance in polar region

为研究北斗三号与GPS在极区的定位性能,基于STK软件,仿真分析两系统在4个极地科考站点和极区范围的卫星可见性和GDOP值,结果表明:在极区60°~80°范围内,北斗三号东半球定位性能优于西半球,而当纬度超过80°时,东西半球无明显差异;与GPS相比,在纬度60°~80°,经度50°~180°范围内,北斗三号定位性能优于GPS,极区其他区域平均可见星数比GPS少1颗左右,GDOP值相差不大。此外,北斗三号GDOP值变化更平稳,表明极区北斗三号卫星空间分布更合理。

To research the positioning performance of BDS-3 and GPS in the polar region.Based on STK software,the satellite visibility and GDOP values of the two systems in four polar scientific research stations and polar areas are simulated and analyzed.The results show that the positioning performance of BDS-3 in the eastern hemisphere is better than that in the western hemisphere within the polar region of 60°~80°.When the latitude exceeds 80°,there is no significant difference between the eastern and western hemispheres;Compared with GPS,the positioning performance of the BDS-3 is better than GPS in the range of latitude 60°~80°and longitude 50°~180°.In other regions of the polar region,the average number of visible satellites is about 1 less than that of GPS and GDOP values have little difference.In addition,the GDOP value of the BDS-3 changes more smoothly.It shows that the spatial distribution of BDS-3 satellite in the polar region is more reasonable.