Communications: directive radio wave systems and devices (e.g. – With particular circuit – Display
Patent
1993-11-01
1996-05-21
Lobo, Ian J.
Communications: directive radio wave systems and devices (e.g.,
With particular circuit
Display
364731, G01S 744
Patent
active
055194010
ABSTRACT:
A pseudo-code representation and a C language representation of a scan converter system whereby radar amplitude data specified in polar coordinates may be displayed on a computer monitor display controlled by rectangular coordinates is provided. The invention utilizes a look-up table that is built using a two-phase algorithm. The look-up table is set into an initial state after which a mapping process takes place in which all of the (x,y) coordinate values covering the display area are inversely projected to the nearest (r,.theta.) coordinate values using trigonometric and approximation procedures. Since more than one (x,y) value may map to the same (r,.theta.) value, these values are linked together to form a patch. All of the (r,.theta.) coordinates will not be hit in this mapping process. Therefore, a second phase of projection occurs. Each (r,.theta.) coordinate not hit in the aforementioned inverse projection is now projected forward to an (x,y) coordinate using trigonometric and approximation procedures. Upon conclusion of the formation of the look-up table, each (r,.theta.) value will have an associated patch of (x,y) values. The look-up table may now be addressed by r and .theta.. The associated patch contains the x and y coordinate values which are used to paint the display.
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Farmer Michael E.
Sohn Stephen M.
Bowen Glenn W.
Lobo Ian J.
Loral Corporation
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