机场工程中坐标系的转换计算

Calculation of coordinate transformation in airport engineering

本文对我国机场工程可能存在多种坐标系现状进行了叙述,论述了这些坐标系之间相互转换的方法、数学模型、转换参数的解算过程及精度分析,说明了建立机场抵偿面坐标系的必要性,在实际算例中详细介绍了转换实现的过程,并对坐标转换的精度进行了评定;证明了机场测量控制网基于GPS精密解算获得的ITRF瞬时历元坐标,可以实现精度优于7.5cm的WGS-84坐标转换。

This paper reviews several coordinate systems possibly existing in the present airport engineering in our country,and describes the transformation methods and mathematical models,the process of solving transformation parameters and the assessment of accuracy.It also discusses the necessity of setting up an airport coordinate system with compensated surfaces.In real case studies,we introduce the detail procedures of setting up a coordinate transformation,and estimate the accuracy of such a transformation.It is proved that the ITRF instantaneous epoch coordinates,which are determined from the airport mapping control network based on GPS precise ephemeris,can be transformed to the WGS-84 coordinates with an accuracy better than 7.5cm.