单频GPS/GLONASS组合单点定位的精度评估

摘要

The results of combined GPS/GLONASS single point positioning (SPP) are compared with each other under different observation weights by using single-frequency pseudorange observations and broadcast ephemeris data and then the effect of atmospheric errors on SPP is discussed and analyzed. Finally, the computation of SPP is conducted with the Least Square and Kalman filter algorithms. The results indicate that the combined GPS/GLONASS SPP can achieve accuracies better than 2.5 m in the horizontal components and 4.5 m in the vertical component for single-epoch solutions. In addition, accuracies better than 1 m in three coordinate components can be obtained during a 24-hour observation period. Compared with GPS-only SPP, the accuracy improvement is significant for both algorithms.%利用单频伪距观测值和广播星历数据,比较不同观测值权值下GPS/GLONASS组合单点定位的结果,并讨论大气误差对组合单点定位精度的影响.利用最小二乘和卡尔曼滤波两种算法进行单点定位计算,结果表明,组合定位单历元平面位置解精度优于2.5 m,高程方向精度优于4.5 m,24小时解3个坐标分量精度均优于1 m,对于该两种算法,组合定位与单独GPS定位相比精度均有不同程度的提高.