视准轴

通过GPS/INS给出的投影中心位置、视准轴姿态观测值及三线阵CCD像空间坐标，可以直接计算地面点在物空间的坐标。

One can get the coordinates of object points on the ground directly assisted by the measure-ments of the perspective center position and the attitude of boresight given by GPS / INS .

视准轴与测距轴不平行对测量结果的影响

The Effect of the Distancing-Axis Not to Parallel to Sight-Axis on Measurement Results

根据现代微倾水准仪的视准轴可以调整的构造特点，阐述了使水准仪视准轴垂直于竖轴的方法，以及倾斜竖轴法放样斜坡面的原理；

According to the structural feature of modern tilting levels , the method of erecting the collimation axis to the standing axis and the principle of the setting out of slope with the tilting standing axis are expounded .

同时由于地面环境不能完全替代航摄作业环境，因而目前利用地面检校方法得到的视准轴误差和空间位置偏心差值稳定性和精度均低于飞行检校得到的精度。

Also , the stability and accuracy of the Boresight Misalignment and Levers Arms which are got by using ground calibration method are lower than flight calibration , the reason probably is that the ground environment could not replace flight environment absolutely .

分析了视准轴误差、水准尺立尺误差等对观测成果的影响及规律，提出了消除或减弱仪器误差、外界条件影响及观测误差的基本方法，从而有效提高了外业沉降观测精度。

Collimation errors , stuff setting errors , and its influences and rules on the settlement result were analyzed . Some basic methods such as weakening or eliminating instrumental errors , field condition errors and observation errors were proposed , which will effectively improve the observation precision of field settlement .