BDS-3四频短基线单历元定位方法

Short baseline single-epoch positioning method of BDS-3 quad-frequency

为了充分利用北斗三号B1I、B3I、B1C和B2a四频观测数据,该文提出了一种基于北斗三号四频组合的短基线单历元定位方法。采用无几何模型和几何模型相结合的方法依次求解两个超宽巷、三个宽巷和一个窄巷模糊度,并利用LAMBDA方法搜索固定窄巷模糊度,最后使用模糊度固定的窄巷进行单历元定位。利用北斗三号短基线实测数据进行验证分析,结果表明,该方法可以有效进行超宽巷和宽巷模糊度的单历元固定,窄巷模糊度固定率高于99%,基本可以实现短基线单历元定位,并获得厘米级定位精度。

In order to make full use of BDS-3 quad-frequency observation data B1I,B3I,B1C and B2a,this paper proposed a short baseline single-epoch positioning method based on BDS-3 four-frequency combination.Two extra-wide-lane ambiguities,three wide-lane ambiguities and one narrow-lane ambiguity was solved by combining geometry-free model with geometry-based model in turn,and the LAMBDA method was used to search for the narrow-lane ambiguity.Finally,the narrow-lane with fixed ambiguity was used for single epoch positioning.The measured data of BDS-3 short baseline was used for verification and analysis.The results showed that this method can effectively fix extra-wide-lane and wide-lane ambiguity in a single epoch,and the success rate of narrow-lane ambiguity resolution was higher than 99%,which can basically realize the short baseline single epoch positioning and achieved centimeter-level positioning accuracy.