Algorithm for radar coordinate conversion in digital scan converters
US4697185A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jul 1, 1983 |
| Grant date | Sep 29, 1987 |
| Priority date | — |
| Expiry date | Jul 1, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S7/298
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Disclosed is a system for high speed conversion of radar formats from polar coordinates to cartesian coordinates. From an initial address X.sub.i Y.sub.i where a radar pulse crosses a display, subsequent addresses are determined by adding constant values sin .theta..sub.i and cos .theta..sub.i to X.sub.i and Y.sub.i. This is faster than the prior method of calculating x.sub.i and Y.sub.i by multiplying R.sub.i (range) by sin .theta..sub.i and cos .theta..sub.i. Also disclosed is a system for filling the display between adjacent radials at long ranges where spoking of the display tends to occur. This is done by adding constant increments to one cartesian value on one vector until the next vector is reached while maintaining the other cartesian value constant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.