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科技导报  2014 

基于GPS定位原理的轨道外部几何参数测量系统

DOI: 10.3981/j.issn.1000-7857.2014.31.004, PP. 41-45

Keywords: GPS,轨道外部几何参数,控制网,外场试验

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Abstract:

利用GPS定位全天候、高效率、低成本的特性,设计出一种新型的轨道外部几何参数测量系统.该系统由卫星系统、加载接收机的轨检仪、控制网和GPRS发射站组成.测量前,先构建边连式同步图形扩展式带状轨道监测控制网,并在现有的轨检仪上加载GPS接收机.测量过程中,轨检仪沿轨道运动GPS控制网中4个GPS基站与轨检仪上GPS流动站实时采集定位信息;定位信息经双差处理和整周模糊度解算后,得到RTK(real-timekinematic)观测量,确立轨道中心线;结合轨检小车测出的轨道内部几何参数和轨道中心线,解算出轨道高程.静态实验与外场试验结果表明该测量系统自动化程度较高,静态观测误差在0.5mm以内,动态误差在15mm以内,完全能够满足轨道外部几何参数高精度测量的要求.

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