US3699669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radar landmass simulator
Assignee: United States Department of the Navy
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Filing: 1971-06-14
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Granted: 1972-10-24
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Expires: 1991-06-14
Abstract
Abstract In a radar landmass simulator having one photographic memory for storing elevation information and another photographic memory for storing reflectivity information, surplus reflectivity storage is used to store multiplying factors for expanding the elevation information. The multiplying factors are combined with the elevation information to extend the range of usable elevations. Since a surplus of reflectivity storage is available, the net effect is to increase the available elevation storage by a factor of three or more with no increase in the size of the memories.
Inventors
- 👤 Hans H Wolff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:44
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/40; G01S7/4052; G01S7/4082
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
106 words
In a radar landmass simulator having a first memory for storing radar reflectivity information and a second memory for storing terrain elevation information to be displayed on a radar display, the improvement comprising: a first memory modified to store both reflectivity information and additional elevation information, means for reading out said reflectivity information and said additional elevation information from said first memory and said elevation information from said second memory simultaneously, combining means for combining said additional elevation information and said elevation information into combined elevation information, and means for transmitting said combined elevation information to said radar display to increase the range of elevations displayed.
Claim 2
Dependent Claim
106 words
In a radar landmass simulator having a first memory for storing radar reflectivity information and a second memory for storing terrain elevation information to be displayed on a radar display, the improvement comprising: a first memory modified to store both reflectivity information and additional elevation information, means for reading out said reflectivity information and said additional elevation information from said first memory and said elevation information from said second memory simultaneously, combining means for combining said additional elevation information and said elevation information into combined elevation information, and means for transmitting said combined elevation information to said radar display to increase the range of elevations displayed.
Claim 3
Dependent Claim
39 words
The apparatus of claim 1, wherein said elevation information is comprised of a selected number of discrete signal levels and wherein said combined elevation information is comprised of a number of discrete signal levels greater than said selected number.
Claim 4
Dependent Claim
54 words
The apparatus of claim 2, said combining means including a reflectivity scale converter for converting said reflectivity information and said additional elevation information into a number of reflectivity signals and a number of group signals, and an elevation scale converter for combining said elevation information and said group signals into said combined elevation information.
Claim 5
Dependent Claim
94 words
The apparatus of claim 3 and including connecting means for transmitting said group signals from said reflectivity scale converter to said elevation scale converter, said reflectivity signals to said radar display and said combined elevation information to said radar display, the arrangement being such that the number of discretely different reflectivity signals transmitted to said radar display is less than the storage capacity of said first memory and the number of discrete signal levels in said combined elevation information transmitted to said radar display is greater than the storage capacity of said second memory.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |