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- 2017
利用北斗系统建立和维持国家大地坐标参考框架的方法研究
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Abstract:
2000中国大地坐标系统（China Geodetic Coordinate System 2000，CGCS2000）的建立和维持主要依赖于GPS技术，不利于保障国家时空信息安全。中国北斗卫星导航系统（BeiDou navigation satellite system，BDS）提供亚太区域服务，可满足中国及周边地区高精度定位导航应用需求，对建立和维持国家大地坐标参考框架具有重要意义。研究利用已建成的北斗基准站网观测数据，实现基于BDS技术、并与国际地球参考框架（International Terrestrial Reference Frame，ITRF）一致的国家大地坐标参考框架，为今后国家级和全球性北斗坐标参考框架（BeiDou Terrestrial Reference Frame，BTRF）的建立和维持提供理论基础和方法支撑。初步计算结果表明，积累2 a以上的观测数据，利用单独BDS数据可以获得与GPS精度相当的水平速度场，精度约为2~3 mm/a。基于单独BDS数据，测站残差平面和高程的重复性分别可优于0.8 cm和1.7 cm。利用BDS数据已可监测到测站高程方向的季节性变化。此外，还对单独BDS与GPS数据计算的坐标可能存在的与经纬度相关的系统误差进行了分析。总体来说，目前的北斗系统可满足建立和维持中国cm级大地坐标框架的需求
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