Influence Analysis of Differential Corrections Transmitting Cycle on Positioning Precision
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摘要: 介绍了GPS(Global Positioning System)定位的误差来源及差分的具体形式,描述了伪距定位及伪距差分定位的数学模型.分析了差分修正后的用户伪距残差和SA(Selective Availability)信号的关系,并从SA的时间相关特性出发,分析了伪距差分中差分改正数的更新率对定位精度的影响.最后,利用RTCM SC 104格式的电文1进行了不同更新率的实验,得出了具有实践意义的结论.Abstract: The positioning error elements of GPS are described and the differential means are proposed in detail. The mathematics models of pseudo-range position and pseudo-range differential position are also introduced. The relationship between the corrected user pseudo-range residue and SA signal is analyzed. Based on the temporal correlation of SA signal, a suitable transmitting cycle of correction is then acquired in the local differential method. The correction contains pseudo-range correction and pseudo-range rate correction, which are included in the RTCM SC-104 telegraphese 1. In final, the practical conclusion is provided via many pseudo-range differential position experiments in a fixed point and many different correction-transmitting cycles.
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Key words:
- navigation /
- positioning /
- difference /
- time correlation
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