基于伪卫星的北斗系统定位精度改进方法研究

针对北斗二号一期系统卫星集中分布在赤道附近,导致国土范围内接收机南北方向定位精度偏低,且由于可视卫星均为正仰角,导致接收机垂直方向定位精度也偏低的问题,提出了利用地面伪卫星改善用户观测几何结构的方法来提高国土范围内北斗接收机的定位精度。仿真结果表明,在用户使用范围的北部地区布设伪卫星可有效降低用户南北方向以及垂直方向的DOP值,从而有效改善定位精度。

BDS Positioning Accuracy Improvement based on Pseudolites

Compass satellites concentrating near the equator, which resulting in a low positioning accuracy within the Homeland in north-south direction. And because the visible satellites are positive elevation, the vertical positioning accuracy is also low. To solve the above problems, a method to improve BDS positioning accuracy is proposed, which is using pseudolites to improve the user observation geometry. Simulation results show that the DOP in north-south and vertical direction can be reduced effectively by lying pseudolites in the north area of users, thus the positioning accuracy can be effectively improved.