CAJ | 학술논문

为了研究精密单点定位（ PPP）模型及PPP精密授时的精度，对PPP模型和精密授时原理进行了分析和评价．首先，给出了传统无电离层组合PPP模型及精密授时的原理和数学模型；然后，采集了IGS提供的4个测站的数据进行实例分析；最后，对PPP模型定位结果和精密授时结果进行了精度分析．实验结果表明：无电离层组合PPP模型的平面定位精度可达mm级，高程方向精度优于4 cm；PPP精密授时精度可达0．1 ns，采用外符合RMS值来评判授时结果的精度，结果显示，授时误差在0．3 ns内，授时精度较高；采用Allan方差来评判钟差的稳定性，结果显示，一天数据的钟差稳定度在10-20～10-23之间，很好地保证了精密授时的稳定性．
위료연구정밀단점정위（ PPP）모형급PPP정밀수시적정도，대PPP모형화정밀수시원리진행료분석화평개．수선，급출료전통무전리층조합PPP모형급정밀수시적원리화수학모형；연후，채집료IGS제공적4개측참적수거진행실례분석；최후，대PPP모형정위결과화정밀수시결과진행료정도분석．실험결과표명：무전리층조합PPP모형적평면정위정도가체mm급，고정방향정도우우4 cm；PPP정밀수시정도가체0．1 ns，채용외부합RMS치래평판수시결과적정도，결과현시，수시오차재0．3 ns내，수시정도교고；채용Allan방차래평판종차적은정성，결과현시，일천수거적종차은정도재10-20～10-23지간，흔호지보증료정밀수시적은정성．
In order to study the precise point positioning ( PPP) model and the accuracy of precise timing, the principles of the PPP model and the precise timing are analyzed and evaluated.First, the principles and mathematical models of the ionosphere-free combined PPP model and precise timing are presented.Then the data of four stations in the IGS( international GNSS service) website is col-lected to perform an example analysis.Finally, the accuracies of PPP model positioning and precise timing results are analyzed.The experimental results show that the plane positioning precision of ion-osphere-free combined PPP model in the GPS( global positioning system) can reach millimeter level, and the height accuracy exceeds 4 cm.On the other hand, the precision of PPP model precise timing can reach nanosecond level, and the precision is judged by external accord accuracy, it shows the precise timing error is within 0.3 ns, which indicates the accuracy is high.The stability of precise timing is judged by Allan variance, and the stability of clock bias within a day is between 10 -20 and 10 -23 , which guarantees the stability of precise timing.