中文摘要：

统一S波段（Unified S-band,USB）系统是目前中国载人航天和月球探测任务的主要测控网.文章对中国USB系统的测距测速数据的误差构成进行了详细分析,给出了传播媒介、相位中心偏差、时标偏差、通道时延以及卫星星历误差的修正模型,并通过对实测数据的残差分析,对目前中国USB测量数据的精度进行了评估,给出了USB测距和测速数据的实际精度.最后,针对目前USB数据的处理和应用情况,提出了数据处理上需注意的一些问题.文章的结论对今后改善中国USB系统的测定轨精度具有一定的参考价值.

英文摘要：

The Unified S-band System （USB） is the main TT＆C （Telemetry,Tracking and Command） network used in space missions including manned spacecraft and lunar exploration programs of China.Firstly,all kinds of errors existed in the USB range and range-rate measurements were analyzed,and the error correction models of tropospheric refraction delay,ionospheric delay,time tag bias,phase center error,channel delay and satellite ephemeris error were presented.Secondly,the accuracy of the USB measurements was evaluated and obtained based on the residual analysis of the USB range and range-rate measurements of a real space mission.Finally,according to the current actuality of disposal and application of USB measurements,some advices that should be noted in data processing were put forward.The conclusions have important reference value to improve the accuracy of orbit determination based on the USB system of China.