摘要
介绍了GPS(GlobalPositioningSystem)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(SelectiveAvailability)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RTCMSC 1 0 4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 .
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.
出处
《北京航空航天大学学报》
EI
CAS
CSCD
北大核心
2000年第6期633-635,共3页
Journal of Beijing University of Aeronautics and Astronautics
