本文以城市地铁建设为对象，对现代城市地下工程各阶段的高精度测量技术进行了研究。
The city subway construction being taken as the object, the high accuracy direction survey technology at the various stages of the modern city underground project was studied in the paper.
描述了一种用神经网络技术实现的高精度光栅测量装置。
A grating measuring instrument with high resolution developed by neural networks technique is described.
为了抑制噪声的影响，应用交流技术开发了有更高精度的锁相微分电导测量系统。
In order to depress the noise, a lock-in differential conductance measurement system is designed.
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