In order to measure ballistic trajectory accurately, the measurement precision of the photoelectric theodolite should be investigated.
为了保证外弹道的测量精度，就应对光电经纬仪的测量精度进行合理设计。
2
Principle of the industrial system measurement using a theodolite as the sensor is introduced, with sources of error and their effects upon precision analyzed.
Using electron theodolite dummy photograph observing tunnel border displacement, as the example, the authors analyse the principle, means and precision of the system.