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- 2018
一种改进的精密单点定位模型
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Abstract:
针对现有精密单点定位（PPP）模型收敛慢的问题，提出了一种改进的PPP定位模型。采用码相位半合组合观测值以及几何无关组合观测值分别降低码伪距观测噪声和轨道误差的影响，该模型不仅具有较小的观测噪声，还降低了轨道误差影响。实验结果表明，引入新的组合观测值后明显改善了PPP的解算性能。当观测时长为0.5 h时，采用所提模型的收敛率较标准非组合（un-combined model，UC）模型、UofC（university of calgary model）模型和标准非差无电离层组合（un-difference ionosphere free combined model，UD）模型分别提高了37.6%、4.2%和235.9%，且收敛速度有明显提高；在定位精度方面，新模型与UofC模型较为一致，但明显优于UC和UD模型；采用新模型估计的天顶对流层延迟与UC模型较为一致，且高于UofC和UD模型
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