车载经纬仪的测量误差修正

载车平台变形会直接导致经纬仪方位旋转轴线产生倾斜,从而影响经纬仪的测角精度。为补偿测角精度,实现活动站测量,通过球面几何推导了平台变形对光电经纬仪测角误差影响的修正公式,利用光电轴角编码器精度高、采样频率高的特性,测量出经纬仪坐标系倾斜,经过坐标变换推导出经纬仪倾斜角和倾斜方向,该测量装置通过时统终端与经纬仪望远系统同时记录测角数据及倾斜数据,从而对测角误差进行修正。实验结果表明,该方法能够实时有效地补偿因平台变形而带来的测角误差,使经纬仪不落地测角精度控制在20″内,为实现高精度车载光电测量提供了一种有效的途径。

Measurement error correction of vehicular theodolite

The deformation of vehicular platform directly results in the oblique of the azimuth spin axis of theodolite,which would impact its angle-measuring precision.In order to compensate the measuring precision so as to achieve the measurement on movable station,we’ve deduced the correct formula that relates the impact of angle-measuring precision of the theodolite on the deformation of vehicular platform based on spherical geometry.Based on the precision and high sampling rate of the photoelectric angle encoder,and through coordinate conversion we measure the incline of the coordinate system of the theodolite;at the same time,we record the data of inclined angles with the temporal unitary terminal and telescope system,thus we correct the angle-measurement error.Experiment results manifest that this method is able to compensate the error from the deformation of the platform,the measurement precision can reach 20″when the theodolite is working on the platform,which provides an effective method to achieve precise measurement of vehicular photoelectric theodolite.