›› 2013, Vol. 33 ›› Issue (4): 62-70.

• 技术交流 •

### 基于三频数据的北斗卫星导航系统DCB参数精度评估方法

1. （北京卫星导航中心，北京 100094）
• 收稿日期:2012-10-30 修回日期:2013-01-10 出版日期:2013-08-25 发布日期:2013-08-25
• 作者简介:樊家琛 1989年生，2011年毕业于北京大学数学科学学院数学与应用数学专业，助理工程师。研究方向为卫星精密定轨及GNSS精密定位应用等。
• 基金资助:

国家自然科学基金（41204023）、上海市空间导航与定位技术重点实验室开放课题资助项目

### COMPASS Satellites DCB Parameter Accuracy Assessment Based on Tri-frequency Data

FAN  Jia-Chen, WU  Xiao-Li, LI  Yu-Xiang, WEI  Gang

1. (Beijing Satellite Navigation Center,Beijing 100094)
• Received:2012-10-30 Revised:2013-01-10 Online:2013-08-25 Published:2013-08-25

Abstract: As an important part of GNSS navigation message, the differential code bias (DCB) parameter is one of the main error sources affecting the PNT services. COMPASS provides navigation signals on three frequencies, and broadcasts two TGD parameters. An algorithm to solve COMPASS satellites DCB parameters and their form error was introduced. According to the COMPASS tri-frequency characteristics, a new method using different dual-frequency combinations was proposed to evaluate the accuracy of DCB parameters. DCBs provided by manufacturers and DCBs solved by the algorithm are taken to analyze the effects on UERE and positioning accuracy. Real data analysis indicates that the form error of COMPASS satellite DCBs and GPS satellite DCBs share the same accuracy, however, influenced by the satellite constellation and regional distribution of stations, the stability of COMPASS satellite DCBs is worse than that of GPS satellite DCBs from IGS. The accuracy of COMPASS satellite DCBs is better than 0.5ns, and the difference of VTEC between different calculations using two kinds of geometric free combinations is better than 0.6TECU. Compared with DCBs provided by manufacturers, dual-frequency user′s 3D positioning accuracy is improved from 13.80% to 47.42% by using DCBs from the algorithm.