Co-ordinate System

We define a right handed co-ordinate system with an origin at the center of the scanner imaging lens. The x-axis is parallel to the long axis of the scanner front plate (this is horizontal in the usual scanning geometry). The y-axis is parallel to the short axis of the scanner front plate (vertical in the usual scanning geometry), and the z-axis is the range, or the distance perpendicular to the scanner front plate. The co-ordinate system is illustrated in the following figure.

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