Patent US6043776A successfully refreshed from Google Patents.
US6043776A
Expired / Lapsed
US
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Mobile satellite communication system
Assignee: Mitsubishi Electric Corp
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Filing: 1998-03-02
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Granted: 2000-03-28
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Expires: 2018-03-02
Abstract
Abstract A mobile satellite communication system including an artificial satellite which is situated in a satellite orbit and develops an active phased array antenna so as to accomplish a line to a terrestrial station using a portable terminal in a specific area. As a result, a service that satisfies a demand for communication in the specific area can be realized.
Inventors
- 👤 Isamu Chiba
- 👤 Takashi Katagi
- 👤 Shuji Urasaki
- 👤 Yoshihiko Konishi
- 👤 Makoto Matsunaga
- 👤 Akio Iso
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:32
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/14; H04B7/15; H04B7/204; H04B7/2041
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
307 words
A mobile satellite communication system comprising an artificial satellite, disposed in a satellite orbit, which develops an active phased array antenna so that it accomplishes a line to a terrestrial station using a portable terminal in a specific area, wherein said satellite orbit is a substantially static orbit inclined with respect to the equator and having an eccentricity; wherein said active phased array antenna includes a receive active phased array antenna and a transmit active phased array antenna; wherein said artificial satellite includes a receive artificial satellite for reception only on which said receive active phased array antenna is mounted and a transmit artificial satellite for transmission only on which said transmit active phased array antenna is mounted; wherein said receive artificial satellite and said transmit artificial satellite are docked with each other after said receive artificial satellite and said transmit artificial satellite are put in said substantially static orbit, to exhibit a transmit/receive function as one artificial satellite; wherein said receive active phased array antenna includes a first electric wave-to-optical convertor that converts a signal received by a receive device antenna into an optical signal; wherein a receive satellite body of said receive artificial satellite includes a first optical-to-electric wave convertor that converts the optical signal into an electric signal; wherein said first electric wave-to-optical convertor and said first optical-to-electric wave convertor are connected through a first optical fiber; wherein a transmit satellite body of said transmit artificial satellite includes a second electric wave-to-optical convertor that converts the electric signal into the optical signal; wherein said transmit active phased array antenna includes a second optical-to-electric wave convertor that converts the optical signal into a microwave signal and a transmit device antenna that radiates said microwave signal; and wherein said second electric wave-to-optical convertor and said second optical-to-electric wave convertor are connected through a second optical fiber.
Claim 2
Dependent Claim
307 words
A mobile satellite communication system comprising an artificial satellite, disposed in a satellite orbit, which develops an active phased array antenna so that it accomplishes a line to a terrestrial station using a portable terminal in a specific area, wherein said satellite orbit is a substantially static orbit inclined with respect to the equator and having an eccentricity; wherein said active phased array antenna includes a receive active phased array antenna and a transmit active phased array antenna; wherein said artificial satellite includes a receive artificial satellite for reception only on which said receive active phased array antenna is mounted and a transmit artificial satellite for transmission only on which said transmit active phased array antenna is mounted; wherein said receive artificial satellite and said transmit artificial satellite are docked with each other after said receive artificial satellite and said transmit artificial satellite are put in said substantially static orbit, to exhibit a transmit/receive function as one artificial satellite; wherein said receive active phased array antenna includes a first electric wave-to-optical convertor that converts a signal received by a receive device antenna into an optical signal; wherein a receive satellite body of said receive artificial satellite includes a first optical-to-electric wave convertor that converts the optical signal into an electric signal; wherein said first electric wave-to-optical convertor and said first optical-to-electric wave convertor are connected through a first optical fiber; wherein a transmit satellite body of said transmit artificial satellite includes a second electric wave-to-optical convertor that converts the electric signal into the optical signal; wherein said transmit active phased array antenna includes a second optical-to-electric wave convertor that converts the optical signal into a microwave signal and a transmit device antenna that radiates said microwave signal; and wherein said second electric wave-to-optical convertor and said second optical-to-electric wave convertor are connected through a second optical fiber.
Claim 3
Dependent Claim
221 words
A mobile satellite communication system comprising an artificial satellite that is disposed in a satellite orbit and develops an active phased array antenna so that it accomplishes a line to a terrestrial station using a portable terminal in a specific area, wherein said satellite orbit is a substantially static orbit inclined with respect to the equator and having an eccentricity; wherein said active phased array antenna includes a receive active phased array antenna and a transmit active phased array antenna; wherein said receive active phased array antenna includes a first electric wave-to-optical convertor that converts a signal received by a receive device antenna into an optical signal; wherein a satellite body of said artificial satellite includes a first optical-to-electric wave convertor that converts the optical signal into an electric signal; wherein said first electric wave-to-optical convertor and said first optical-to-electric wave convertor are connected through a first optical fiber; wherein said satellite body further includes a second electric wave-to-optical convertor that converts the electric signal into the optical signal; wherein said transmit active phased array antenna includes a second optical-to-electric wave convertor that converts the optical signal into a microwave signal and a transmit device antenna that radiates said microwave signal; and wherein said second electric wave-to-optical convertor and said second optical-to-electric wave convertor are connected through a second optical fiber.
Claim 4
Dependent Claim
221 words
A mobile satellite communication system comprising an artificial satellite that is disposed in a satellite orbit and develops an active phased array antenna so that it accomplishes a line to a terrestrial station using a portable terminal in a specific area, wherein said satellite orbit is a substantially static orbit inclined with respect to the equator and having an eccentricity; wherein said active phased array antenna includes a receive active phased array antenna and a transmit active phased array antenna; wherein said receive active phased array antenna includes a first electric wave-to-optical convertor that converts a signal received by a receive device antenna into an optical signal; wherein a satellite body of said artificial satellite includes a first optical-to-electric wave convertor that converts the optical signal into an electric signal; wherein said first electric wave-to-optical convertor and said first optical-to-electric wave convertor are connected through a first optical fiber; wherein said satellite body further includes a second electric wave-to-optical convertor that converts the electric signal into the optical signal; wherein said transmit active phased array antenna includes a second optical-to-electric wave convertor that converts the optical signal into a microwave signal and a transmit device antenna that radiates said microwave signal; and wherein said second electric wave-to-optical convertor and said second optical-to-electric wave convertor are connected through a second optical fiber.
Claim 5
Dependent Claim
76 words
The mobile satellite communication system according to claim 2, wherein said satellite body further includes an analog-to-digital signal convertor that converts said analog electric signal into a digital signal, a first digital beam former that forms a beam on the basis of said digital signal, a second digital beam former that forms a beam on the basis of a data signal, and a digital-to-analog signal convertor that converts said digital electric signal into an analog signal.
References Cited (Backward Citations)
EP0237009A2
Cited
US4827421A
Cited
US4922257A
Cited
US4843397A
Cited
US4943808A
Cited
US4885589A
Cited
US5016018A
Cited
US5161248A
Cited
EP0464765A1
Cited
US5367305A
Cited
US5231405A
Cited
US5788187A
Cited
US5430451A
Cited
US5345321A
Cited
US5548292A
Cited
US5422647A
Cited
WO1994029927A1
Cited
US5500648A
Cited
WO1995022489A1
Cited
US5619211A
Cited
US5845206A
Cited
WO1997005704A1
Cited
US5758260A
Cited
US5652750A
Cited
GB2315644A
Cited
GB2318947A
Cited
US5790070A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-03-28 | 2003-09-27 | 2004-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-03-28 | 2007-09-27 | 2008-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-03-28 | 2011-09-27 | 2012-03-28 | $7700.00 | Window Closed / Lapsed |