这次升级的目的是想在现有功能的基础上添加接收和处理精密距离以及微波着陆系统近地数据的能力。
The upgrade is intended to add to the present features the capability to accept and process precision distance together with the MLS approach data.
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.
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