This paper presents an investigation of the precise point positioning (PPP) performance of a combined solution from BDS-2 and BDS-3 satellites. To simultaneously process different BDS signal observations, i.e., B1/B1C, B2/B2a and B3C, undifferenced and uncombined observations with ionosphere delay constrained by the deterministic plus stochastic ionosphere model are used in the basic model. Special attention is paid to code bias and receiver clock parameters in the derivation of the observation model. The analysis is carried out using more than one-month data for BDS-2 and BDS-3 collected at the CANB, DWIN, KNDY and PETH stations in the Asia-Pacific region. The results suggest that compared with BDS-2 alone, the BDS-2 and BDS-3 solution provides significantly more accurate PPP, with increases of 28%, 21% and 5% in the up, north and east directions, respectively. In addition, the average root mean square error decreases to 0·21, 0·13 and 0·16 m for the three directions. Furthermore, the PPP convergence time for BDS-2 and BDS-3 is about 1·5 h and less than 1 h for the horizontal and vertical components, respectively, whereas that for BDS-2 alone is about 2·3 h for both directions.

中文翻译：

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BDS-2和BDS-3卫星三频观测精确点定位的初步性能评估

本文研究了北斗二号和北斗三号卫星组合解决方案的精确单点定位（PPP）性能。为了同时处理不同的BDS信号观测，即B1/B1C、B2/B2a和B3C，在基本模型中使用具有确定性加随机电离层模型约束的电离层延迟的非差分和未组合观测。在推导观测模型时要特别注意码偏和接收机时钟参数。分析使用了在亚太地区 CANB、DWIN、KNDY 和 PETH 站收集的 BDS-2 和 BDS-3 一个多月的数据。结果表明，与BDS-2单独相比，BDS-2和BDS-3解决方案提供的PPP精度明显更高，在上、北和东方向分别增加了28%、21%和5%，分别。此外，三个方向的平均均方根误差减小到0·21、0·13和0·16 m。此外，BDS-2 和 BDS-3 的 PPP 收敛时间分别约为 1·5 h，水平分量和垂直分量均小于 1 h，而 BDS-2 单独的双向收敛时间约为 2·3 h .