摘要
Abstract
With the increase in navigation constellations and signal types,differential code bias(DCB)has become a critical correction product in precision data processing.This paper focuses on evaluating the performance of the DCB products for the newly added B1C,B2a,and B2b frequency signals in BDS-3,and compares the DCB prod-ucts released by the DLR,GFZ and CAS which have been corrected for phase center offset(PCO).A long-term time series analysis is conducted to assess the stability and consistency of four DCB products:CAS0,CAS1,DLR and GFZ.The results indicate that CAS products exhibit the highest stability and IGSO satellite DCB has better sta-bility than MEO.CAS1,DLR and GFZ show good consistency;however,significant differences exist between CAS0 and CAS1 due to PCO correction.The positioning experiments demonstrate that the performance differences among the three DCB products in both SPP and PPP applications are generally minor,with the primary impact ob-served in the elevation component.Moreover,the PCO correction shows limited improvement in positioning accura-cy for some stations,which may be attributed to the inclusion of corresponding corrections in processing.This study provides valuable reference for precision GNSS users in selecting and utilizing DCB products.关键词
北斗三号/差分码偏差/伪距偏差/天线相位中心/精密单点定位Key words
BDS-3/differential code bias/pseudorange bias/phase center offset/PPP分类
天文与地球科学
