车载经纬仪的垂轴误差分析

基于高精度机动式车载测量平台,提出了利用综合坐标变换法修正补偿机动平台变形引起的光电经纬仪测角误差。分析了综合坐标变换法的基本原理,建立基座、照准部及望远镜坐标系,并推导得出了三轴误差公式。构建了一个车载平台模型,并根据实际算例分别通过综合坐标变换法和传统单项误差累计法进行误差修正。结果表明,综合坐标变换法较单项误差累计法误差修正精度提高5,避免了单项误差累计法工作范围内分布多个较大误差点的弊端,具有较高的补偿精度,将该方法应用于机动车载测量系统可进行高精度的测量,具有较高的理论和实用价值。

Analysis of vertical axis error of vehicular theodolite

The theodolite which works on a vehicle has measurement error caused by the deformation of vehicle platform. Two methods that the single error accumulation method and the comprehensive coordinate transformation method to compensate the error were deduced. First, the basic principle of the two methods was analyzed, taking into account the limitations of the different correction methods. Then a practical example with a vehicle platform containing large deformation derivation was built. The measurement error were summarized in two correction methods were compared. The results show that the correct error of the single error accumulation method has several points within large error in whole work scope of the theodolite, caused the error about 5 larger than the comprehensive coordinate transform method. Therefore the comprehensive coordinate transformation method must be used to obtain high-precision measurements.