适用于不同基线条件下北斗三频RTK算法研究

Research on Beidou Tri-frequency RTK Algorithm Suitable for Different Baseline Conditions

针对RTK作业过程中,不同长度基线残余误差大小的差异对定位结算的影响,本文分析了短、中、长3种基线条件下的主要误差来源及其大小,并比较了几种不同的三频RTK结算策略对各项误差的处理能力,提出了分别适用于短、中、长3种不同基线条件的三频RTK算法。对于15 km以内的短基线,采用改进的TCAR算法解算;中基线条件下采用电离层加权模型;对于大于100 km的长基线采用将两个超宽巷相叠加的宽巷组合的WRTK定位。不同长度基线实测数据处理结果表明:3种算法可以实现相应基线条件下的最佳解算效果,在短基线和中基线下实现厘米级定位,长基线则可以实现平面方向误差小于15 cm、高程方向误差小于30 cm的分米级快速定位。

In the process of RTK operation,the impact of the difference in the residual error of different length baselines on positioning and settlement.This paper analyzes the major error sources and their sizes under three baseline conditions:short,medium,and long,and compares the processing capabilities of several different tri-frequency RTK settlement strategies for various errors.Three-frequency RTK algorithm with three different baseline conditions.For short baselines within 15 km,an improved TCAR algorithm is used for solution;in the baseline,an ionospheric weighting model is used;for long baselines greater than 100 km,WRTK positioning using a combination of two wide lanes with super wide lanes superimposed is used.The processing results of measured data of baselines of different lengths show that the three algorithms can achieve the best settlement effect under the corresponding baseline conditions,achieve centimeter-level positioning under the short baseline and the middle baseline,and the long baseline can achieve the plane direction error less than 15 cm and the elevation direction Quick positioning in decimeters with errors less than 30 cm.