Axis intersection measurement of three-axis turntable with two crosshair targets

In order to measure three-axis intersection error, two crosshair targets were fixed in the inner axis frame of a three-axis turntable. Also a theodolite was used to point its telescope to the targets and to measure the horizontal angles when three axes were on equi-spaced angle positions. The calculation equations of the axis intersection were deduced from the mounting position of the theodolite, positions of two targets, angular positions of three axes, and the measured horizontal angles with the theodolite. Finally, a practical measurement is carried out on a horizontal three-axis turntable and error analysis is conducted.

利用坐标变换推导经纬仪三轴误差

通过几台经纬仪的交汇测量方式或单站测距方式能够确定目标的空间坐标，经纬仪的三轴误差的大小直接影响测量精度。本文利用坐标变换方法推导经纬仪三轴误差，并将其结果与利用球面三角学推导的结果进行了比较，探索了推导经纬仪三轴误差的新方法。

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。