GPS接收机码间偏差(DCB)的确定

DETERMINATION OF GPS RECEIVER'S DCB

利用双频载波相位平滑伪距数据构建DCB解算数学模型,并利用"中国地壳运动观测网络工程"2003年的数据,计算网络工程基准站接收机的DCB值,分析其日及月变化。结果表明,利用上述方法,能够以优于1ns精度确定基准站接收机的码间偏差,且码间偏差在日及月尺度上没有明显的趋势变化。

The determination of differential code biases （DCB） plays an important role in many GPS applications supported by code observations which include precise point positioning, ionosphere monitoring and the time transfer among GPS observation stations. The mathematical model for estimating the DCB is presented, which is based on the phase - smoothed code. The DCB for receivers of the reference station in CMONOC were determined with GPS observations of these stations in 2003, and daily and monthly variations of DCB were analyzed. It＇ s showed that the accuracy of DCB can be better than 1 nanosecond and the DCB of the reference station in the CMONOC have no remarkable variation during the time period considered.