BDS伪距偏差改正对UPD估计的影响分析

摘要

Since the BeiDou satellite-induced code bias is detected and confirmed to be frequency-and elevation dependent,the characteristics of wide lane ambiguity has been changed and the extra bias will affect the UPD estimation.Therefore,the UPD estimation with code bias corrected is proposed.The data of eighteen CORS stations in Hong Kong from January 4 to January 13,2016 are used and this paper further analyzes UPD characteristics of wide-lane and narrow-lane UPD before and after the correction of satellite-induced code bias.The result shows that the BeiDou satellite code bias of wide-lane ambiguity is eliminated by correction model,the consistency,usage of data and residual distribution of wide lane UPD are improved significantly,and the UPD of narrow-lane ambiguity is also improved especial for the data usage rate.%针对BDS伪距偏差严重影响U PD估计的问题,提出基于单站伪距偏差改正的U PD估计方法,并利用香港地区18个连续运行参考站2016-01-04至2016-01-13的数据进行U PD估计,详细分析BDS卫星伪距偏差改正前后的宽巷和窄巷U PD特性.结果表明:BDS卫星伪距偏差会对宽巷U PD的结果引入将近0.5个整周的偏差,降低宽巷和窄巷U PD的数据利用率,改正伪距偏差后,宽巷U PD的一致性、数据利用率以及残差分布均得到显著提高,窄巷U PD的估计结果尤其是数据利用率也得到提高.