从微波着陆系统工作原理出发，分析讨论了角度测量过程中存在的误差源，及其所影响到的角度计算因子。
This paper first discussed three main guiding system, and then, base on MLS principle, analyzed error sources as well as other factors that affect the measurement result.
从实验误差理论角度，分析了沙摆重心变化引起的实验误差，结果表明由重心变化引起的误差相对于其它误差而言在实验中占主要地位。
The experiment error which altering barycenter of sand pendulum brings about is analyzed theoretically. And it is also an important factor comparing with others.
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