iGPS测量不确定度空间分布分析方法

针对i GPS实际测量现场的快速评估与布局优化问题,研究了i GPS测量不确定度空间分布规律.给出了i GPS测量模型,据此建立了i GPS测量不确定度通用两站分析模型,进一步提出了基于两站模型变换的测量不确定度空间分布分析方法,并根据发射器覆盖范围进行了修正.该方法适用于发射器为任意数目与空间布局的i GPS测量环境,可用于计算i GPS测量环境中任一空间点的测量不确定度.构建了i GPS两站与四站实际测量环境,并进行了数值仿真计算与实际测量偏差对比.结果表明,两者数据吻合良好,该i GPS测量不确定度空间分布分析方法能有效描述i GPS测量不确定度空间分布规律.

Analysis method of iGPS measurement uncertainty spatial distribution

The spatial distribution of iGPS measurement uncertainty was studied to help rapid assessment and layout optimization of iGPS measurement. According to the measurement model of iGPS, a typical two-station model of measurement uncertainty was established. Furthermore, a universal analysis method of iGPS measurement uncertainty distribution was proposed and modified in accordance with transmitter coverage. This method is applicable to diverse iGPS measurement environment with an arbitrary number of the transmitters in different layouts, and can be used to calculate the measurement uncertainty at any spatial point. Real measurement environment with two stations and four stations were established respectively. The distribution of actual measured deviations corresponded to the numerical simulation results. This analysis method was proved effective to describe the measurement uncertainty distribution pattern of iGPS.