EXTENSIBLE HIGH BANDWIDTH GLOBAL SPACE COMMUNICATION NETWORK

• US 20120302160A1
• Filed: 05/27/2011
• Published: 11/29/2012
• Est. Priority Date: 05/27/2011
• Status: Active Grant

• Current Assignee: Raytheon Company (Rtx Corporation)
• Original Assignee: Raytheon Company (Rtx Corporation)
• Inventors: SILNY, John F., COLEMAN, Gary D., HASTINGS, C. Thomas Jr., MINISCALCO, William J., MCSPADDEN, James
• Granted Patent: US 8,693,947 B2
• Time in Patent Office: Days
• US Class Current: 455/12.1
• CPC Class Codes: H04B 7/18508 with satellite system used as relay, i.e. aeronautical mobile satellite service
• CPC Class Codes: H04B 7/18521 Systems of inter linked satellites, i.e. inter satellite service for optical links between satellites H04B10/118
• CPC Class Codes: H04B 7/195 Non-synchronous stations

Abstract

Various embodiments provide a satellite communication system including a first transceiver and a second transceiver geographically fixed on the earth, and a first satellite configured to communicate with the first transceiver through a first link. The system further includes a second satellite configured to communicate with the second transceiver through a second link and communicate with the first satellite through a laser communication crosslink. The first satellite and the second satellite are at a low earth orbit or medium earth orbit below the geostationary earth orbit of approximately 36000 km.

Claims

1. A satellite communication system, comprising:

a first transceiver and a second transceiver geographically fixed on the earth;

a first satellite configured to communicate with the first transceiver through a first link; and

a second satellite configured to communicate with the second transceiver through a second link and communicate with the first satellite through a laser communication crosslink,

wherein the first satellite and the second satellite are at a low earth orbit or medium earth orbit below a geostationary earth orbit of approximately 36000 km.

2. The system of claim 1, wherein the first transceiver is provided on an airborne asset.

3. The system of claim 2, wherein the first transceiver on the airborne asset comprises an antenna configured to track the first satellite.

4. The system of claim 2, wherein the airborne asset is an unmanned aerial vehicle.

5. The system of claim 1, wherein the second transceiver is a ground base station.

6. The system of claim 5, wherein the ground base station is within a transmission coverage of the second satellite so as to receive a transmission from the second satellite.

7. The system of claim 5, wherein the ground base station comprises a plurality of antennas configured and arranged so that a field of regard of the antennas provides a period of time sufficient for the second satellite to downlink data to the ground base station during orbit transit of the second satellite.

8. The system of claim 1, wherein the first transceiver is configured to uplink data to the first satellite, the first satellite is configured to relay the data to second satellite via the laser communication link, and the second satellite is configured to downlink the data to the second transceiver.

9. The system of claim 1, wherein the first transceiver is configured to communicate with the first satellite and the second satellite is configured to communicate with the second transceiver with low time latency less than approximately 100 ms.

10. The system of claim 1, wherein the first transceiver is configured to communicate with the first satellite and the second satellite is configured to communicate with the second satellite at a data rate greater than about 1 gigabits per second.

11. The system of claim 1, wherein a data rate of the laser communication crosslink is greater than approximately 1 gigabit per second.

12. The system of claim 1, wherein the laser communication crosslink operates at two laser wavelengths, one wavelength for sending data and another wavelength for receiving data.

13. The system of claim 1, wherein the laser communication crosslink operates using two polarization modes, one polarization mode for sending data and another polarization mode for receiving data.

14. The system of claim 1, wherein the laser communication crosslink employs wavelength division multiplexing so as to increase data rate, wherein in the wavelength division multiplexing, a plurality of wavelengths are employed in the laser communication crosslink for transmitting data and plurality of wavelengths are employed in the laser communication crosslink for receiving data.

15. The system of claim 1, wherein the first link and the second link are radio frequency communication links or laser communication links, or a combination thereof.

16. The system of claim 1, further comprises a ground control station configured to communicate with the first satellite or the second satellite so as to select a desired route for transmitting data received by the first satellite to the second satellite.

17. The system of claim 1, wherein the first satellite and the second satellite are configured to autonomously compute a desired route for transmitting data between the first satellite and the second satellite without being controlled to do so by a ground control station.

18. The system of claim 1, wherein the first satellite and the second satellite comprise a plurality of radio frequency receivers, one radio frequency transmitter and a plurality of laser communication transceivers.

19. The system of claim 18, wherein the first transceiver includes a plurality of transceivers on a plurality of airborne assets,

the plurality of radio frequency receivers of the first satellite are configured to receive data from the plurality of transceivers on the plurality of airborne assets,

one of the laser communication transceivers of the first satellite is configured to transmit the data to one of the laser communication transceivers of the second satellite, and

the one radio frequency transmitter of the second satellite is configured to transmit the data to the second transceiver.

20. The system of claim 18, wherein the plurality of radio frequency receivers include four radio frequency receivers.

21. The system of claim 18, wherein the plurality of laser communication transceivers include six laser communication transceivers.

22. The system of claim 1, wherein the first satellite and the second satellite are part of a constellation of low earth orbit satellites.

23. The system of claim 1, wherein the first satellite and the second satellite are part of a constellation of a plurality of low earth orbit satellites.

24. The system of claim 1, wherein the first satellite and the second satellite are part of a constellation of low earth orbit satellites.

25. The system of claim 1, wherein the system is extendible by adding a third satellite such that the third satellite is configured to communicate with the first satellite or the second satellite though another laser communication crosslink.

26. The system of claim 1, wherein the system is reconfigurable by upgrading software or hardware of the first satellite or the second satellite, or both.