一种地基GNSS接收机差分码偏差估算方法

GNSS不同频点间的码伪距作差会引入信号的差分码偏差（DCB），包括GNSS卫星及地面接收机的DCB。本文提出一种地基GNSS接收机差分码偏差参数估算方法，首先由电离层文件参数作线性插值，计算出电离层延迟误差。之后对IGS站观测文件进行加权最小二乘法估计，得到GPS卫星和地面GNSS接收机的L1C频点和L2P频点间码偏差。该方法能同时获取卫星DCBs与地面GNSS接收机的DCBr，有效解决地面GNSS接收机DCBr获取的问题。通过对估计的卫星DCBs与CODE公布的值进行对比和统计分析，结果表明，两者卫星DCBs（C1P2）之差的RMS均值误差 < 0.3541 ns，地基GNSS接收机DCBr（C1P2）估算精度优于1.6105 ns。 

A Method for Estimating Differential Code Deviation of Ground-based GNSS Receiver

The difference of code pseudo-range between different frequency points of GNSS will lead to the DCB of the signal. The DCB of GNSS satellite and ground receiver can cause an accuracy error of about 25 ns, which must be corrected. Against to this problem, this paper proposes a differential code deviation estimation method for ground-based GNSS receivers. This method can obtain the DCBr of ground GNSS receiver and satellite DCBs at the same time, and effectively solve the problem of ground GNSS receiver DCBr acquisition. Through the comparison and statistical analysis of the estimated satellite DCBs and the values published by code, the results show that the RMS mean error of the difference between the two satellites DCBs (C1P2) is less than 0.3541 ns, and the estimation accuracy of ground-based GNSS receiver DCBr (C1P2) is better than 1.6105 ns.