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。

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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。

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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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Tokyo's own estimate for the number of civilian deaths in Nanjing is far less precise, ranging from as little as 20, 000 to 200, 000.

WSJ: Chinese Outraged By Denial of Nanjing

The approach du jour for most researchers is something known as Light Detection and Ranging ( LIDAR) -- a laser-based technology capable of creating precise maps over relatively large areas.

ENGADGET: Microsoft Kinect used to map asteroids, glaciers, other scary things