Ruler algorithm for PPI rectangular radar scan converter with st

Communications: directive radio wave systems and devices (e.g. – With particular circuit – Display

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342195, G01S 710

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active

061409553

ABSTRACT:
A process provides radar scan conversion from radar amplitude data in polar coordinates to rectangular coordinates by a digital computer which receives (r,.theta.) coordinate amplitude data from a radar receiver and which supplies (x,y) coordinate amplitude data which covers a rectangular-shaped display area of a monitor display. A software program generates an aggregate radial scan pattern that consists of a plurality of radials each of which have active lengths that span one or more of a plurality of selected regions of the display such that the region boundaries are square as a result of a modified radial drawing method. Each resolution region is defined by the bisection of the radials forming the previous resolution region and the hole-filled range of the previous resolution region. The display can be generated as an offset display where the antenna center may be offset from the display center.

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