北斗实时精密轨道和钟差产品解算策略及精度评定

随着北斗卫星导航系统全球星座部署即将完成，其应用领域不断扩大，实时精密服务性能受到了极大关注。基于动力学精密定轨方法，设计了北斗卫星实时轨道、钟差算法流程和解算策略。利用不同频点信号，分别计算了BDS-2和BDS-3卫星的实时精密轨道和钟差，建立了完整的轨道和钟差精度评定方法，重点对解算的实时产品的精度进行了评定。结果表明：BDS-2和BDS-3实时精密轨道和钟差产品精度均可满足大部分实时用户的需求。对于B1IB3I频点，BDS-3 MEO卫星的实时轨道精度约为26cm，径向精度约为6cm，实时钟差精度约为0.45ns，且相较于BDS-2，性能更加稳定；对于B1CB2a频点，BDS-3 MEO卫星的实时轨道精度优于20cm，精度和稳定性较高。

BDS Real-Time Precise Orbit and Clock Offset Products Solution Strategy and Accuracy Evaluation

With the completion of Beidou Navigation Satellite System (BDS) global constellation deployment and the expansion of BDS applications, the real-time high-precision service perfor-mance of BDS has received great attention. Based on the dynamic precise orbit determination method, the real-time orbit and clock offsets algorithm flow and solution strategy of BDS are designed. Using different frequency signals, the real-time precise orbit and clock offsets of BDS-2 and BDS-3 satellites are calculated respectively. A complete evaluation method of orbit and clock offsets accuracy is established, and the accuracy of the real-time products is evaluated. The results show that BDS-2 and BDS-3 satellites real-time high-precision orbit and clock offset products can meet the needs of most real-time users. Using B1IB13 frequency signals, the real-time orbit accuracy of BDS-3 MEO satellites is about 26cm, the accuracy in the radial direction is about 6cm, and the accuracy of clock offsets is about 0.45ns respectively.The performance of BDS-3 is more stable compared with BDS-2. Using B1CB2a frequency signals, the real-time orbit accuracy of BDS-3 MEO satellites is better than 20cm, with higher accuracy and stability.