Patent US5615407A successfully refreshed from Google Patents.
US5615407A
Expired / Lapsed
US
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Satellite communications system using an intermediate satellite to provide same frequency uplink and downlink
Assignee: Airbus Group SAS
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Filing: 1994-12-29
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Granted: 1997-03-25
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Expires: 2014-12-29
Abstract
Abstract For exchange of information between an earth-station and a satellite in geostationary orbit, information signals addressed to the satellite are transmitted from the earth-station, and information signals from the satellite are received at the earth-station. Signals addressed to the satellite and the signals from the satellite have a common first carrier frequency. Signals addressed to the satellite are transmitted to an intermediate satellite with an angular offset from the satellite in geostationary orbit. The intermediate satellite retransmits signals laterally to the geostationary orbit satellite on a second carrier frequency different from the first carrier frequency.
Inventors
- 👤 Gerard Barkats
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:55
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/14; H04B7/15; H04B7/185; H04B7/18521; H04B7/19
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
125 words
A method of exchanging information between an earth-station and a satellite in geostationary orbit, said method comprising the steps of: transmitting information signals addressed to said satellite to an intermediate satellite with an angular offset from said satellite in geostationary orbit on a first carrier frequency, said information signals addressed to said geostationary satellite being transmitted from said earth-station; retransmitting said information signals addressed to said geostationary satellite laterally to said geostationary satellite in geostationary orbit on a second carrier frequency different from said first carrier frequency, said information signals addressed to said satellite being retransmitted from said intermediate satellite; and receiving information signals from said geostationary satellite on said first carrier frequency, said information signals from said geostationary satellite being received by said earth-station.
Claim 2
Independent Claim
125 words
A method of exchanging information between an earth-station and a satellite in geostationary orbit, said method comprising the steps of: transmitting information signals addressed to said satellite to an intermediate satellite with an angular offset from said satellite in geostationary orbit on a first carrier frequency, said information signals addressed to said geostationary satellite being transmitted from said earth-station; retransmitting said information signals addressed to said geostationary satellite laterally to said geostationary satellite in geostationary orbit on a second carrier frequency different from said first carrier frequency, said information signals addressed to said satellite being retransmitted from said intermediate satellite; and receiving information signals from said geostationary satellite on said first carrier frequency, said information signals from said geostationary satellite being received by said earth-station.
Claim 3
Dependent Claim
40 words
The method of exchanging information according to claim 1, wherein said method further comprises the step of selecting said first carrier frequency and said second carrier frequency such that said second carrier frequency is higher than said first carrier frequency.
Claim 4
Dependent Claim
40 words
The method of exchanging information according to claim 2, wherein said step of retransmitting said information signals addressed to said satellite includes selecting said second carrier frequency such that said second carrier frequency is equal to at least 30 GHz.
Claim 5
Dependent Claim
199 words
The method of exchanging information according to claim 1, wherein said method further comprises the steps of: receiving said information signals addressed to said geostationary satellite and transmitted from said earth-station in parallel with other signals transmitted on said first carrier frequency from other earth-stations, said information signals transmitted from said earth-station and said other signals transmitted from said other earth-stations being received by said intermediate satellite; multiplexing said information signals received from said earth-station and said other signals received from said other earth-stations, said information signals received from said earth-station and said other signals received from said other earth-stations being multiplexed by said intermediate satellite; retransmitting said information signals and said other signals toward said satellite in geostationary orbit at said second carrier frequency, said information signals and said other signals being retransmitted by said intermediate satellite; receiving said information signals and said other signals from said intermediate satellite, said information signals and said other signals being received by said satellite in geostationary orbit; and demultiplexing said information signals and said other signals retransmitted from said intermediate satellite, said information signals and said other signals retransmitted from said intermediate satellite being demultiplexed by said satellite in geostationary orbit.
Claim 6
Dependent Claim
36 words
The method of exchanging information according to claim 1, wherein said step of transmitting information signals addressed to said satellite includes selecting said angular offset such that said angular offset is equal to at least 2°.
Claim 7
Dependent Claim
36 words
The method of exchanging information according to claim 1, wherein said step of transmitting information signals addressed to said satellite includes selecting said angular offset such that said angular offset is equal to at least 10°.
Claim 8
Dependent Claim
25 words
The method of exchanging information according to claim 1, wherein said method further comprises the step of positioning said intermediate satellite in a geostationary orbit.
Claim 9
Independent Claim
120 words
A system for transmitting information, said system comprising: an earth-station having a transmitter and a receiver; a satellite in geostationary orbit, said satellite having a receiver and a transmitter, said transmitter of said satellite and said receiver of said earth-station pointed toward each other and tuned to a first carrier frequency; and an intermediate satellite offset angularly from said satellite in geostationary orbit, said intermediate satellite having an intermediate receiver and an intermediate transmitter, said transmitter of said earth-station and said intermediate receiver pointed toward each other and tuned to said first carrier frequency, said intermediate transmitter of said intermediate satellite and said receiver of said geostationary satellite pointed laterally toward each other and tuned to a second carrier frequency.
Claim 10
Independent Claim
120 words
A system for transmitting information, said system comprising: an earth-station having a transmitter and a receiver; a satellite in geostationary orbit, said satellite having a receiver and a transmitter, said transmitter of said satellite and said receiver of said earth-station pointed toward each other and tuned to a first carrier frequency; and an intermediate satellite offset angularly from said satellite in geostationary orbit, said intermediate satellite having an intermediate receiver and an intermediate transmitter, said transmitter of said earth-station and said intermediate receiver pointed toward each other and tuned to said first carrier frequency, said intermediate transmitter of said intermediate satellite and said receiver of said geostationary satellite pointed laterally toward each other and tuned to a second carrier frequency.
Claim 11
Dependent Claim
21 words
The system for transmitting information according to claim 8, wherein said second carrier frequency is higher than said first carrier frequency.
Claim 12
Dependent Claim
23 words
The system for transmitting information according to claim 9, wherein said second carrier frequency has a value equal to at least 30 GHz.
Claim 13
Dependent Claim
30 words
The system for transmitting information according to claim 8, wherein said transmitter of said earth-station and said receiver of said earth-station have a pointing difference equal to at least 2°.
Claim 14
Dependent Claim
30 words
The system for transmitting information according to claim 8, wherein said transmitter of said earth-station and said receiver of said earth-station have a pointing difference equal to at least 10°.
Claim 15
Dependent Claim
130 words
The system for transmitting information according to claim 8, wherein said intermediate receiver and said intermediate transmitter conjointly include a receive antenna mounted on said intermediate satellite, a receiver stage connected to said receive antenna, an amplifier stage connected to said receiver stage, a multiplexer and transmitter stage connected to said amplifier stage, and a transmit antenna connected to said multiplexer and transmitter stage, and wherein said receiver of said geostationary satellite and said transmitter of said geostationary satellite conjointly include a receive antenna mounted on said geostationary satellite, a demultiplexer stage connected to said receive antenna, a receiver stage connected to said demultiplexer stage, an amplifier stage connected to said receiver stage, a transmitter stage connected to said amplifier stage, and a transmit antenna connected to said transmitter stage.
Claim 16
Dependent Claim
58 words
The system for transmitting information according to claim 8, wherein said intermediate satellite has a position in geostationary orbit, and wherein said intermediate transmitter of said intermediate satellite and said receiver of said geostationary satellite each have positions such that said intermediate transmitter of said intermediate satellite and said receiver of said geostationary satellite point toward each other.
References Cited (Backward Citations)
US4004098A
Cited
US4287588A
Cited
US4375697A
Cited
US4691882A
Cited
JPS6057736A
Cited
US4689625A
Cited
US4701935A
Cited
WO1992000632A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-03-24 | 2000-09-23 | 2001-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-03-24 | 2004-09-23 | 2005-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-03-24 | 2008-09-23 | 2009-03-25 | $7700.00 | Window Closed / Lapsed |