轨道基准网平面测量及其数据处理的探讨

Discussion on Plane Surveying and Data Processing of Track Reference Network

轨道基准网作为一种从德国引进的全新的建网方法,其测量和数据处理方法以及精度控制指标跟我国常规的测量方法有很多不同之处,因此对轨道基准网平面测量及其数据处理进行详细的探讨很有必要。通过大量的实测数据统计分析和理论推导,得出如下结论:(1)对CPⅢ和轨道基准点外业质量检查应设定不同的限差进行;(2)确定了轨道基准网站内平面坐标转换采用的是三参数相似变换法;(3)用重叠区内首尾2个轨道基准点坐标反算的近似方位角代替重叠区内轨道基准点处的线路切线方位角,计算重叠区内轨道基准点平面位置偏差是可行的。

Track reference network is a brand-new method of establishing network introduced from German; and there are a lot of differences between track reference network and domestic conventional survey method, including survey method and data processing as well as accuracy control indexes. Therefore, it is necessary to make a detail discussion on plane surveying and data processing of track reference network. Based on statistical analysis of large amounts of measured data and theoretical derivations, the results are as follows： （1）Respectively for CP-111 and track reference point, the different tolerance values of field measurement quality checks should be set up. （2） Plane coordinate transformation within track reference network station should be done by 3-parameter similarity transformation method. （3） It＇s feasible to calculate the positional deviation of track reference point in overlap region by using the approximate azimuth instead of the azimuth of route tangent at track reference point in overlap region, and the approximate azimuth is obtained by inverse calculation of coordinates with first point and last point in overlap region.