北斗系统广域差分性能评估技术研究

Research on Wide Area Differential Performance Evaluation Technology of Bei Dou Navigation Satellite System

随着社会经济的快速发展,人们群众生活水平的不断提高,北斗卫星导航系统已在许多领域得到广泛应用与推广。北斗系统在服务领域亦得到了有效的推广与应用,且该系统具有开放服务和授权服务两种服务方式,授权服务方式主要是利用一维等效钟差改正数和导航信息完成高精度定位服务。除此之外,北斗卫星导航系统基于差分信息进行伪距观测数据计算,但通常其精度会受残余伪距噪声影响,从而导致定位产生误差。基于此情况,为有效提升系统广域差分服务性能,笔者对广域差分新模型进行详尽阐述,并指出新模型的优点在于综合了伪距及相位观测数据,并将伪距观测值作为钟差改正数和轨道改正数的定义标准,而计算约束差分改正数的高精度则是以相位历元间差分观测值的相对变化为基准。笔者对北斗系统广域差分性能评估技术进行概述,并对相关数据进行分析,最后得出结论,以期为未来北斗系统广域差分性能的提升提供一定借鉴,从而促进北斗系统广域差分评估技术在我国卫星导航领域的蓬勃发展。

With the rapid development of social economy and the improvement of people＇s living standard, BeiDou Navigation Satellite System （BDS） has been widely used and popularized in many fields. BeiDou Navigation Satellite System （BDS） has also been effectively popularized and applied in the service field, and the system has two service modes： open service and authorization service.Authorization service mainly uses one-dimensional equivalent clock error correction and navigation information to complete the highprecision positioning service. In addition, the BDS is based on differential information for pseudo-range observation data calculation,but usually its accuracy will be affected by residual pseudo-range noise, thus resulting in positioning errors. In view of this situation,in order to improve the performance of wide-area differential service effectively, the author expatiates on the new wide-area difference model in detail, and points out that the advantage of the new model lies in the synthesis of pseudo-range and phase observation data. The pseudo-range observations are taken as the definition criteria of clock error correction and orbit correction, while the high accuracy of computing constraint differential correction is based on the relative variation of phase epoch differential observations. The author summarizes the wide area differential performance evaluation technology of BDS, analyzes the related data, and finally draws a conclusion in order to provide some reference for the promotion of the wide area differential performance of BDS in the future. In order to promote the wide area differential evaluation technology of BDS in the field of satellite navigation in China＇s vigorous development.