定义 中文名称： 圆-圆定位 英文名称： range-range positioning 其他名称： 距离-距离定位 定义： 以测点至两个已知点的距离为半径，已知点为圆心，两圆相交确定点位的方法。 应用学科： 测绘学（一级学科）； 海洋测绘
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外圆无心磨削是不定心的磨削，由托板支承靠工件自身外圆定位进行磨削。
It's orientated by outer circle of workpiece itself and grinded by support of a supporting plate.
结果在豚鼠的颞骨标本上准确定位出下列中耳结构：鼓膜、听骨链、卵圆窗、圆窗、咽圆窗鼓管鼓口、面神经等；
Results The located structures of the middle ear in the guinea pig include tympanic membrane, ossicular chain, oval window, round window, tympanic foramen of eustachian tube, facial nerve, etc;
构建了基于计算机视觉的齿形链链板的测量系统，对直线和圆的边缘定位，提出了新的亚像素算法，计算了齿形链链板的销孔直径及圆度误差、链板节距和两直边夹角，对测量结果进行了误差分析。
The measurement system on chain board of tooth shape chain was established based on computer vision, and a new kind of sub-pixel algorithm for edge orientation of beeline and circle was put forward.
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