US3699570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tacan ground station track and display system
Assignee: United States Department of the Air Force
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Filing: 1970-09-10
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Granted: 1972-10-17
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Expires: 1990-09-10
Abstract
Abstract A lightweight secondary ground radar type function is achieved by modification of standard TACAN equipment. Participating aircraft range and angle information is derived at the ground station from modified aircraft to ground station TACAN signals. This eliminates the need for a separate data link. The technique comprehends triggering the airborne TACAN transponder with the received North burst and transmitting from the aircraft time coded signals which indicate bearing of the plane from the TACAN ground site. The technique permits the ground station to compute several aircraft positions and display them as a radar type of presentation.
Inventors
- 👤 Donald W Hanson
- 👤 Ralph W Mifflin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:06
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/74; G01S13/76; G01S13/765
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
In combination with a TACAN navigation system having a ground beacon station and a plurality of airborne stations, a display system for displaying participating aircraft comprising: in each participating aircraft; means for coding its position information comprising a bearing signal generator responsive to the standard airborne position indicator output in combination with a trigger coder being adapted to generate, in response to the output of said bearing signal generator, discrete pulses having time coded relationships to pulses of the standard airborne station to ground station TACAN signal, and means for transmitting said coded position information to said ground beacon station; and in said ground beacon station, means for receiving and decoding said coded position information, said means for decoding coded position information comprising a timing counter circuit in combinAtion with a scan conversion computer, said combination being adapted to compute the difference in time of receipt of standard aircraft to ground station TACAN signal pulses and said discrete pulses and generate a position information signal therefrom, and means for displaying said decoded position information.
Claim 2
Dependent Claim
174 words
In combination with a TACAN navigation system having a ground beacon station and a plurality of airborne stations, a display system for displaying participating aircraft comprising: in each participating aircraft; means for coding its position information comprising a bearing signal generator responsive to the standard airborne position indicator output in combination with a trigger coder being adapted to generate, in response to the output of said bearing signal generator, discrete pulses having time coded relationships to pulses of the standard airborne station to ground station TACAN signal, and means for transmitting said coded position information to said ground beacon station; and in said ground beacon station, means for receiving and decoding said coded position information, said means for decoding coded position information comprising a timing counter circuit in combinAtion with a scan conversion computer, said combination being adapted to compute the difference in time of receipt of standard aircraft to ground station TACAN signal pulses and said discrete pulses and generate a position information signal therefrom, and means for displaying said decoded position information.
References Cited (Backward Citations)
US3055001A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |