摘要
在GPS/INS辅助航空摄影测量作业过程中,如果GPS失锁时间过长将会影响到整个机载POS数据后处理精度,从而影响制图效果。文章旨在研究解决传统基于位置、速度组合的松耦合导航系统在GPS失锁情况下后处理精度不高的问题,提出基于伪距、伪距率的紧耦合导航系统:在保证外符合精度前提下,后处理后的位置内符合精度达到0.05m、航向角内符合精度约为0.005deg,各项指标均满足国外GPS/INS辅助航空摄影测量系统解算精度要求。研究结果可以为解决相关问题提供参考。
GPS outages usually occur in the process of GPS/INS aided aerial photogrammetry measurement.If the GPS outages time is too long,the result accuracy of the entire Airborne POS data after postprocessing will be affected,and then the entire follow-up mapping accuracy could be reduced.Tightly coupled navigation system on the base of pseudorange and pseudorange rate was proposed to solve the problem that traditional loosely coupled navigation system which is based on position and velocity can not get high precision after post-processing during GPS outages.Results showed that the position RMS was about 0.05 meters and the heading RMS was about 0.005 degree after post-processing,which could meet the requirements of abroad GPS/INS aided aerial photogrammetry measurement standards.The achievement would provide a reference for related research.
出处
《测绘科学》
CSCD
北大核心
2015年第1期14-17,32,共5页
Science of Surveying and Mapping
基金
科技部国际科技合作项目(2010DFA70990)
国家自然科学基金项目(41164001)
国家科技支撑计划项目(2011BAH12B02
2012BAK15B03)
关键词
组合导航系统
紧耦合
内符合精度
航空摄影测量
integrated navigation system
tightly coupled
inner precision
aerial photogrammetry
