BDS-3不同模式下PPP对流层延迟性能评估

Performance Evaluation of PPP Tropospheric Delay in Different Modes of BDS-3

为分析BDS-3评估天顶对流层延迟的能力,基于全球均匀分布的8个MGEX跟踪站数据,首先采用无电离层和非差非组合模型解算得到BDS-3B1C/B2a和B1I/B3I静态与动态PPP结果,然后提取天顶对流层延迟估值,最后将天顶对流层延迟估值与IGS产品进行对比。结果表明,BDS-3静态PPP精度在厘米级,动态PPP水平精度在厘米级、高程精度在分米级;静态PPP评估天顶对流层延迟结果稳定,误差在毫米级。BDS-3 PPP能精确评估天顶对流层延迟,B1I/B3I组合动态PPP评估结果比B1C/B2a评估结果稳定,但整体误差在厘米级;无论静态还是动态,B1I/B3I组合评估天顶对流层延迟结果均比B1C/B2a更加稳定。

In order to analyze the BDS-3’s ability for evaluating the zenith tropospheric delay, based on the data of 8 MGEX tracking stations uniformly distributed around the world, we used ionosphere-free and non differential non-combined model to obtain the static and dynamic PPP results of BDS-3 B1C/B2a and B1I/B3I at first. Then, we extracted the zenith tropospheric delay estimate. Finally, we compared the zenith tropospheric delay estimate with IGS products. The experimental results show that the static PPP accuracy of BDS-3 is at the centimeter level, the dynamic PPP level accuracy is at the centimeter level, and the elevation accuracy is at the decimeter level. The zenith tropospheric delay results evaluated by Static PPP are stable with error in millimeter level. BDS-3 PPP can accurately evaluate the zenith tropospheric delay. The B1I/B3I combination dynamic PPP evaluation results of zenith tropospheric delay are stable compared to the B1C/B2a evaluation results, but the overall result error is at the centimeter level. Whether static or dynamic, the B1I/B3I combination evaluation results of zenith tropospheric delay are more stable than B1C/B2a.