一.竖直度盘(vertical circle)的构造 1.包括:(1)竖盘(vertical circle)竖盘指标水准管(vertical index bubble tube)和(3)竖盘指标水准管微动螺旋。后两部分可采用竖盘指标自动归 零补偿器(vertical index compensator)来替代
1. Errors related to GPs Satellites 2. Errors related to GPS signal propagation in atmosphere 3. Error related to gPs receivers Gv Principles of the Global Positioning System