US4759716A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotating color mapped radar sweep simulator
Assignee: United States Department of the Navy
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Filing: 1986-03-21
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Granted: 1988-07-26
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Expires: 2006-03-21
Abstract
Abstract A rotating cursor plan position indicator radar display is simulated upon aolor mapped computer driven raster scan CRT display by logically dividing the pixels of the display into a plurality of wedge shaped regions. The color attributes of the pixels in each region are changed in a systematic fashion in order to simulate the appearance of a standard radar display for radar operator training purposes.
Inventors
- 👤 John L. Booker
- 👤 Roger H. Werner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:54
CPC Classifications
G; G09; G09B; G09B9/00; G09B9/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
184 words
Apparatus to simulate the appearance of the rotating line cursor display of a plan position indicator, comprising: a raster scan display device having color-mapped video and a plurality of pixels; and, a general purpose digital processor programmed to logically divide said pixels into a plurality of wedge-shaped polygonal regions each having its apex at the centroid of the display provided by said device, assign a separate register to each said region, store a color number in each said register such that the color numbers in adjacent registers are sequential in a preselected forward direction, and then predeterminedly move the color number in each register from register to register to simulate in said raster scan display the rotating line cursor of a plan postion indicator; and, to logically read the video attribute byte pertaining to the preselected pixel whereat a target is to be displayed, select a target brightness for said pixel compared to the color number in the register of the wedge pertaining to said byte from a predetermined table of color registers, and write the address of the selected register to said pixel.
Claim 2
Dependent Claim
184 words
Apparatus to simulate the appearance of the rotating line cursor display of a plan position indicator, comprising: a raster scan display device having color-mapped video and a plurality of pixels; and, a general purpose digital processor programmed to logically divide said pixels into a plurality of wedge-shaped polygonal regions each having its apex at the centroid of the display provided by said device, assign a separate register to each said region, store a color number in each said register such that the color numbers in adjacent registers are sequential in a preselected forward direction, and then predeterminedly move the color number in each register from register to register to simulate in said raster scan display the rotating line cursor of a plan postion indicator; and, to logically read the video attribute byte pertaining to the preselected pixel whereat a target is to be displayed, select a target brightness for said pixel compared to the color number in the register of the wedge pertaining to said byte from a predetermined table of color registers, and write the address of the selected register to said pixel.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-26 | 1992-01-25 | 1992-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-26 | 1996-01-25 | 1996-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-26 | 2000-01-25 | 2000-07-26 | $7700.00 | Window Closed / Lapsed |