A Troposphere Constraint Method To Improve PPP Ambiguity-Resolved Height Solution
A Troposphere Constraint Method To Improve PPP Ambiguity-Resolved Height Solution
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DOI：
10.1017/s0373463313000647
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发表时间：
2013-10
影响因子：
2.4
通讯作者：
Junbo Shi;Yang Gao
中科院分区：
文献类型：
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作者：
Junbo Shi;Yang Gao
在精确点定位（PPP）中，整数模糊度的解决能够提高定位精度，缩短收敛时间。虽然已证明水平定位精度有显著提高，但发现高度解的改进不太显著，改进这一点需要进一步研究。本文提出了一种利用对流层精确修正的对流层约束方法来改进PPP模糊分辨高度解。这与传统方法不同，传统方法通常应用气象数据计算先验对流层延迟并估计对流层剩余延迟。首先研究了对流层延迟对PPP模糊分辨高度解的影响。基于解耦时钟模型和全球定位系统（GPS）逐时观测数据，对加拿大ppp推断对流层可降水水汽系统的模糊分辨定位结果进行了数值分析。结果表明，该方法可将PPP模糊分辨高度精度从传统方法的5·32 cm进一步提高到3·86 cm。
Integer ambiguity resolution is able to improve positioning accuracy and reduce convergence time in Precise Point Positioning (PPP). Although significantly improved horizontal positioning accuracy has been demonstrated, the height solution improvement is found to be less significant, and improving this requires further investigation. In this paper, a troposphere constraint method using precise troposphere corrections is proposed to improve the PPP ambiguity-resolved height solution. This is different from the conventional approach that typically applies meteorological data to calculate the a priori troposphere delay and estimates the residual troposphere delay. The effects of the troposphere delay on PPP ambiguity-resolved height solutions are first studied. Numerical analysis is conducted to ambiguity-resolved positioning results based on the decoupled clock model and hourly Global Positioning System (GPS) observations from a Canadian PPP-inferred troposphere precipitable water vapour system. The results show that by using the proposed method the PPP ambiguity-resolved height accuracy can be further improved to 3·86 cm compared to 5·32 cm using the conventional approach.