移动车载测图系统的POSLV定位精度评估

本文介绍了移动车载测图系统的组成,阐述了POSLV松组合、紧组合的组合策略以及框架体系。为评估POSLV系统的后处理定位精度,对引进的LandMark系统在国内BJBQL和ZZSM两个试验测区进行测试,在受GPS卫星信号失锁的影响下,POSLV数据后处理能否达到稳健的分米级、厘米级定位精度。试验结果表明,无GPS信号失锁时,POSLV数据后处理定位精度平面最大中误差达到5cm,高程最大中误差8cm;GPS失锁时间最长持续15min时,定位精度下降,平面中误差最大达到75cm,高程中误差最大达85cm。

Accuracy evaluation of POS for land vehicle based on mobile mapping system

The paper described the components of mobile mapping and positioning systems,analyzed the architectures of Position and Orientation System for Land Vehicle (POSLV) and integration strategies,i.e.,loosely coupled integration and tightly coupled integration.Its objective was to evaluate the POSLV post-processed position accuracy during the preliminary tests within the projects BJBQL and ZZSM using Applanix LandMark in China.Within the time duration of GPS outage,POSLV could maintain robust post-processing positioning accuracy with decimeter-level or centimeter-level.The testing results have proved that POSLV could be able to achieve robust positioning with centimeter-level accuracy and accurate orientation during GPS overlay.The post-processing results were RMSE less than 5cm in planimetry and less than 8cm in height.During the 15 minutes duration GPS outage,POSLV could maintain decimeter-level positioning accuracy,corresponding to RMSE less than 75cm in planimetry and 85cm in height.