US5067172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air to ground communications system and method
Assignee: WIRELESS SPECTRUM TECHNOLOGY Inc
•
Filing: 1989-05-30
•
Granted: 1991-11-19
•
Expires: 2009-05-30
Abstract
Abstract An air-to-ground communications system wherein the communicating frequency channels are assigned dependent on the amplitude of the signals received at the base sites and dependent on the altitude of the aircraft.
Inventors
- 👤 Gerald R. Schloemer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:34
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/14; H04B7/15; H04B7/185; H04B7/18502; H04B7/18506; H04B7/24; H04B7/26
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
107 words
In a radio telephone communications systems for selectively providing air-to-ground communications between a plurality of bases and a plurality of aircraft, wherein said aircraft provides respective signal transmitting patterns substantially as an inverted cone coverage covering areas dependent upon the height of the transmitting aircraft, the method of assigning frequency channels based upon evaluating all communicating signals present in the system and assigning a channel to each aircraft which does not interfere with a signal from any other aircraft or base site, and including the steps of assigning channels based upon the amplitudes of signals received at base sites independently of locations and altitudes of the aircraft.
Claim 2
Dependent Claim
107 words
In a radio telephone communications systems for selectively providing air-to-ground communications between a plurality of bases and a plurality of aircraft, wherein said aircraft provides respective signal transmitting patterns substantially as an inverted cone coverage covering areas dependent upon the height of the transmitting aircraft, the method of assigning frequency channels based upon evaluating all communicating signals present in the system and assigning a channel to each aircraft which does not interfere with a signal from any other aircraft or base site, and including the steps of assigning channels based upon the amplitudes of signals received at base sites independently of locations and altitudes of the aircraft.
Claim 3
Dependent Claim
31 words
A method as in claim 1 including the steps of assigning selected channels to aircraft flying at relatively lower altitudes, and assigning other channels to aircraft flying at relatively higher altitudes.
Claim 4
Dependent Claim
120 words
A radio telephone communications system selectively providing air-to-ground communications between a plurality of bases each having transmitters and receivers and a plurality of aircraft each having transmitters and receivers, transmitting means for providing signal transmitting patterns from said aircraft each pattern being substantially an inverted cone and covering areas on the ground dependent upon the height of the aircraft, means for assigning frequency channels for transmission and reception based upon the amplitude of signals received at base sites independently of locations and altitudes of aircraft, means evaluating all communicating signals present in the system, and means for assigning a channel to each aircraft to provide a coverage which does not interfere with signals from any other aircraft or base site.
Claim 5
Dependent Claim
120 words
A radio telephone communications system selectively providing air-to-ground communications between a plurality of bases each having transmitters and receivers and a plurality of aircraft each having transmitters and receivers, transmitting means for providing signal transmitting patterns from said aircraft each pattern being substantially an inverted cone and covering areas on the ground dependent upon the height of the aircraft, means for assigning frequency channels for transmission and reception based upon the amplitude of signals received at base sites independently of locations and altitudes of aircraft, means evaluating all communicating signals present in the system, and means for assigning a channel to each aircraft to provide a coverage which does not interfere with signals from any other aircraft or base site.
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) | 1994-11-18 | 1995-05-20 | 1995-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-18 | 1999-05-20 | 1999-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-18 | 2003-05-20 | 2003-11-19 | $7700.00 | Window Closed / Lapsed |