Accurate carrier phase measurement is an important research direction in precise ranging.
精确的载波相位测量是精密测距中一个很重要的研究点。
In this thesis, the EMW-based precise ranging technology was studied, a location system based on PTR8000 was proposed fulfilling coarse location.
本文针对井下人员定位系统，深入研究了基于电磁波测距的精确定位方法，并提出了一套基于PTR8000的井下人员定位系统方案。
Ultrasonic positioning is simple in structure, practical, low cost, the advantages of precise ranging. Therefore, was widely applied to various fields.
超声波定位具有结构简单、实用性强、成本低、测距精准等优点，因此被广泛的应用到各个领域。
Ultrasonic positioning is simple in structure, practical, low cost, the advantages of precise ranging. Therefore, was widely applied to various fields.
超声波定位具有结构简单、实用性强、成本低、测距精准等优点，因此被广泛的应用到各个领域。
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