BDS/GPS非差“一步法”融合定轨数据质量及精度分析

摘要

目前BDS/GPS融合定轨方法主要为“两步法”融合定轨.但在解算过程中,两个系统之间存在系统偏差会使BDS定轨精度下降.为降低融合定轨中系统偏差对轨道精度的影响,采用B1/B3和L1/L2频点组合的非差“一步法”融合定轨的方法,把BDS和GPS卫星置于同一参考框架下进行定轨,并对B1/B3频点的数据进行质量分析.结果分析证明,B1/B3频点数据质量优于B1/B2频点数据质量;“一步法”非差融合定轨获取的BDS轨道精度也优于“两步法”融合定轨获取的BDS轨道精度.其中BDS-MEO&IGSO卫星定轨精度优于100 mm;BDS-GEO卫星定轨精度优于1000 mm.%At precent,determinating orbit by "two-step" is the main method of BDS/GPS multi-orbit determination.However,during the calculation process,the systematic bias of the reference frame will reduce the accuracy of BDS orbit determianted.In order to eliminates the systerm bias,one-step non-differential multi-orbit determination with B1/B3 & L1/L2 is adopted.In this method,GPS and BDS stallites are processed in one reference frame for determination.And the data quality of B1/B3 are analysised.The result shows that the data quality of B1/B3 is better than that of B1/B2,and the accuray of BDS satellite orbit determinating in one step is better than that in two steps.The orbit accuracy of BDS-MEO and IGSO is better than 100 mm,and that of the BDS-GEO orbit is better than 1000 mm.