BDS卫星端DCB不同表达对单点定位精度的影响

摘要

Considering that there is a closure among differential code biases ( DCBs) of B1B2, B1B3 and B2B3, this paper analyses the impact of different representations of BDS satellite DCB correction formula on positioning accuracy of single point position ( SPP) and precise point position ( PPP) under the three sampling rates. The re-sults show that in different sampling rate after DCB correction, SPP and dynamic PPP precision improve in meter level, decimeter to meter level, respectively, percentage improvement in 10~80 percent, 50~90 percent, respec-tively. The impact of different DCB representations on positioning accuracy is in centimeter magnitude. This error magnitude can be neglected in SPP, and in dynamic PPP we suggest choose the code corrective observation mean of different representations as the final correction value.%考虑到北斗卫星导航系统( BDS)的B1B2,B1B3及B2B3之间硬件延迟( DCB)值存在一个闭合差,分析BDS卫星端DCB改正公式不同表示方法在3种采样率下对定位精度的影响,分别进行了伪距定位和精密定位解算。结果表明,不同采样率的DCB改正后SPP下精度改善在m级,提高10%~80%；动态PPP下精度改善在dm~m级,提高50%~90%。改正公式的不同DCB表示方法对精度影响在cm量级,在SPP中可忽略该误差,动态PPP中建议取DCB改正均值作为最终改正值。