基于B1c/B2a/B3I北斗三频实时高采样率动态PPP分析

为了分析北斗三号新信号的三频实时动态PPP定位性能,首先推导了三频两两组合无电离层模型和三频非差非组合模型的观测方程。基于山东建筑大学CORS站观测得到的北斗三号B1c/B2a/B3I三频信号1s采样率数据,使用iGMAS提供的超快速精密星历预报部分,制定了基于B1cB3I-B2aB3I三频无电离层两两组合、B1cB2aB3I三频非差非组合以及用于对比分析的B1cB2a、B1IB3I两种双频无电离层共四种定位方案。然后利用Net_Diff软件进行实时动态PPP实验,对超快速精密轨道和钟差预报部分的精度和稳定度以及实验解算结果进行分析,对比不同定位方案的定位性能。实验分析表明,两种三频定位方案定位性能均优于B1cB2a双频定位方案,定位精度能达到0.462m和0.479m,收敛至分米所需时间能达到45.8min和62.8min;B1IB3I方案定位性能优于两种三频定位方案,定位精度和收敛速度能达到0.228m和6.6min。

BDS Triple-Frequency Real-Time Kinematic PPP Analysis Based on High Sampling Rate Data of B1c/B2a/B3I

In order to analyze the positioning performance of the three-frequency real-time dynamic PPP of the Beidou-3 new positioning signal,the triple-frequency models containing two ionosphere-free combined models and uncombined models are analyzed firstly.By using prediction part of ultra-fast precise ephemeris provided by iGMAS,four positioning schemes including B1cB3I-B2aB3I three-frequency two ionosphere-free combined model,B1c/B2a/B3I three-frequency uncombined model and two kinds of dual-frequency ionosphere-free models based on B1cB2a and B1IB3I for comparison are designed based on the observations from the CORS station of Shandong Jianzhu University.Then,real-time kinematic precise point positioning experiments are done with the Net_Diff software.Ultra-fast precise ephemeris error and experimental solution results are analyzed for comparison of positioning accuracy of different schemes.The experiments show that the positioning performance of the two three-frequency positioning schemes are both better than the B1cB2a positioning scheme.Their positioning accuracies can reach 0.462m and 0.479m and their convergence time can be 45.8min and 62.8min to decimeter scale.The positioning performance of the B1IB3I scheme is better than the two kinds of three-frequency positioning schemes,and its positioning accuracy and convergence speed can be 0.228m and 6.6min,respectively.