Programmed radar coordinate scan conversion
US5519401A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 1, 1993 |
| Grant date | May 21, 1996 |
| Priority date | — |
| Expiry date | Nov 1, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2101/06
- WIPO fieldMeasurement
- WIPO sectorInstruments
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 .…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.