Methods comprising satellites having a regenerative payload, onboard computer, payload interface and interference elimination system

• US 8,948,080 B2
• Filed: 07/17/2007
• Issued: 02/03/2015
• Est. Priority Date: 07/17/2007
• Status: Active Grant

• Current Assignee: Ovzon Sweden AB
• Original Assignee: OverHorizon Cyprus Plc
• Inventors: Wahlberg, Per, Lejnell, Kennet
• Primary Examiner(s): Sarwar, Babar
• Application Number:
  US11/779,228
• Publication Number:
  US 20090022088A1
• Time in Patent Office: 2,758 Days
• Field of Search: 455/12.1, 4554321-453, 455/553.1, 455/426, 455/331, 455/10, 455/509, 455/67.1, 455/67.11, 455/423, 455/562.1, 455/449, 455/424, 370/321, 370/252, 370/329, 370/337, 370/401, 370/468, 370/259, 370/315, 370/316, 370/389, 370/280, 370/264, 370/265
• US Class Current: 370/321
• CPC Class Codes: H04B 7/18532 Arrangements for managing transmission, i.e. for transporting data or a signalling message

Abstract

Systems and methods of satellite communications for moving terminals, including but not limited to on-the-move and mobile terminals (e.g., on-the-pause terminals), are implemented in certain embodiments using smaller antennas (e.g., aperture area with diameter less than 50 cm), open standard waveforms to secure availability from several suppliers, payment for service only when using the terminal, interference avoidance to adjacent satellites, and low cost. Low cost is achieved in part by operating at frequency bands that are currently operated by terrestrial microwave links so that existing low cost microwave components are utilized. The system also includes an interference elimination system that continuously monitors for interference to adjacent satellites from a user terminal'"'"'s uplink signal. If interference is detected, the interference elimination system remedies the interference by performing one or more of the following: shutting down the interfering terminal(s), changing transmission parameters, changing the beam coverage on ground, changing the frequency of the affected traffic, or moving the satellite to a new orbital position. The interference elimination system may also transit the interference information to a control center.

Claims

1. A satellite communications system for mobile terminals, the system comprising:

a satellite configured to receive an uplink signal from one or more mobile user terminals and to transmit a downlink signal to one or more mobile target terminals in a satellite communications network, wherein;

the one or more mobile user or target terminals comprise a small antenna having an aperture area with a diameter of less than 50 cm, and

wherein the satellite comprises;

a regenerative payload,

a demodulator for demodulating the uplink signal received by the satellite,

an onboard computer, and

a payload interface,

wherein the payload interface is coupled to the regenerative payload, the onboard computer and an onboard interference elimination system to enable an onboard interference analysis of the uplink signal after it has been demodulated, and

wherein the system is optimized for a link margin of 5 dB or less.

2. The system according to claim 1 wherein the system operates on Ku-band frequencies.

3. The system according to claim 2 wherein the Ku-band frequencies are shared by satellite communication and terrestrial microwave links.

4. The system according to claim 2 wherein the Ku-band frequencies are substantially in the range from 12.75 to 13.25 GHz for the uplink signal.

5. The system according to claim 2 wherein the Ku-band frequencies are substantially in the range from 10.7 to 10.95, from 11.2 to 11.45 GHz, or both, for the downlink signal.

6. The system according to claim 1 wherein microwave components are utilized by the user terminal.

7. The system according to claim 1 wherein microwave components are utilized by the target terminal.

8. The system according to claim 1 wherein the one or more mobile user terminals are configured for mobile communications.

9. The system according to claim 1 wherein the target terminal is configured for mobile communications.

10. The system according to claim 1 wherein the one or more mobile user terminals are configured for on-the-move communications.

11. The system according to claim 1 wherein the target terminal is configured for on-the-move communications.

12. The system according to claim 1 wherein data throughput of the uplink signal and the downlink signal is greater than required to permit voice communications.

13. The system according to claim 1 wherein data throughput of the uplink signal and the downlink signal is between 0.5 to 8.0 Mbps.

14. The system according to claim 1 wherein the satellite occupies one of the groups consisting of (i) a geostationary orbit, and (ii) a geosynchronous orbit.

15. The system according to claim 1 wherein the satellite further comprises steerable transmit and receive spot beams.

16. The system according to claim 1 wherein the satellite further comprises high sensitivity receive beams.

17. The system according to claim 1 wherein one or more mobile user terminals implements a pay to use billing method.

18. The system according to claim 17 wherein the pay to use billing method is a method implemented by a fixed satellite service.

19. The system according to claim 1 wherein the regenerative payload is configured to use open standard waveforms.

20. The system according to claim 19 wherein the satellite further comprises an onboard mobile phone base station.

21. The system according to claim 20 wherein the onboard mobile phone base station is coupled to the regenerative payload.

22. The system according to claim 1 wherein the regenerative payload comprises a mobile phone base station.

23. The system according to claim 1 wherein the payload interface is coupled to at least one of the group consisting of (i) onboard communication equipment, (ii) sensor systems, and (iii) other satellite equipment.

24. The system according to claim 1 wherein the interference elimination system is configured to detect adjacent satellite interference and generate an interference status.

25. The system according to claim 24 wherein the interference elimination system is configured to transmit the interference status to a satellite control center.

26. The system according to claim 24 wherein the interference elimination system is configured to transmit the interference status to a satellite control center only if the interference status indicates the uplink signal is potentially interfering with adjacent satellites.

27. The system according to claim 24 wherein the interference elimination system performs at least one of the group consisting of (i) shutting down the one or more mobile user terminals, (ii) changing transmission parameters, (iii) changing beam coverage, (iv) changing frequency of affected signal traffic, and (v) moving the satellite to another orbital position, when the interference status indicates the uplink signal is interfering with adjacent satellites.

28. A method of implementing a satellite communications system for mobile terminals, comprising the steps of:

providing a satellite configured to receive an uplink signal from one or more mobile user terminals and to transmit a downlink signal to one or more mobile terminals in a satellite communications network, wherein the one or more mobile terminals comprises a small antenna having an aperture area with a diameter of less than about 50 cm, the satellite comprising;

a regenerative payload, a demodulator for demodulating the uplink signal received by the satellite, an onboard computer, and a payload interface, wherein the payload interface is coupled to the regenerative payload, the onboard computer and an onboard interference elimination system to enable an onboard interference analysis of the uplink signal after it has been demodulated; and

activating the one or more mobile user terminals to send the uplink signal to the satellite, or activating the target terminal to receive the downlink signal from the satellite;

wherein the satellite communications system is optimized for a link margin of 5 dB or less.

29. The method according to claim 28 wherein the system is configured to operate on Ku-band frequencies.

30. The method according to claim 29 wherein the Ku-band frequencies are substantially in the range from 12.75 to 13.25 GHz for the uplink signal.

31. The system according to claim 29 wherein the Ku-band frequencies are shared by satellite communication and terrestrial microwave links.

32. The method according to claim 29 wherein the Ku-band frequencies are substantially in the range from 10.7 to 10.95, from 11.2 to 11.45 GHz, or both, for the downlink signal.

33. The method according to claim 28 wherein microwave components are utilized by the one or more mobile user terminals.

34. The method according to claim 28 wherein microwave components are utilized by the one or more mobile target terminals.

35. The method according to claim 28 further comprising the step of configuring the one or more mobile user terminals for mobile communications.

36. The method according to claim 28 further comprising the step of configuring the one or more mobile target terminals for mobile communications.

37. The method according to claim 28 further comprising the step of configuring the one or more mobile user terminals for on-the-move communications.

38. The method according to claim 28 further comprising the step of configuring the one or more mobile target terminals for on-the-move communications.

39. The method according to claim 28 further comprising the step of configuring data throughput of the uplink signal and the downlink signal to be greater than that required to permit voice communications.

40. The method according to claim 28 further comprising the step of configuring data throughput of the uplink signal and the downlink signal to be between 0.5 to 8.0 Mbps.

41. The method according to claim 28 wherein the satellite further comprises steerable transmit and receive spot beams.

42. The method according to claim 28 wherein the satellite further comprises high sensitivity receive beams.

43. The method according to claim 28 wherein the one or more mobile user terminals implements a pay to use billing method.

44. The method according to claim 43 wherein the pay to use billing method is a method implemented by a fixed satellite service.

45. The method according to claim 28 further comprising the step of configuring the regenerative payload to use open standard waveforms.

46. The method according to claim 45 further comprising installing an onboard mobile phone base station on the satellite.

47. The method according to claim 46 further comprising the step of coupling the onboard mobile phone base station to the regenerative payload.

48. The method according to claim 28 wherein the regenerative payload comprises a mobile phone base station.

49. The method according to claim 28 further comprising coupling the payload interface to at least one of the group consisting of (i) onboard communication equipment, (ii) a sensor system, and (iii) other satellite equipment.

50. The method according to claim 28 wherein the interference elimination system is configured to detect adjacent satellite interference and generate an interference status.

51. The method according to claim 50 wherein the interference elimination system is configured to transmit the interference status to a satellite control center.

52. The method according to claim 50 wherein the interference elimination system is configured to transmit the interference status to a satellite control center only if the interference status indicates the uplink signal is potentially interfering with adjacent satellites.

53. The method according to claim 50 further comprising the step of configuring the interference elimination system to perform at least one of the group consisting of (i) shutting down the one or more mobile user terminals, (ii) changing transmission parameters, (iii) changing beam coverage, (iv) changing frequency of affected signal traffic, and (v) moving the satellite to another orbital position, when the interference status indicates the uplink signal is interfering with adjacent satellites.

54. The method according to claim 28 wherein the step of providing a satellite comprises launching the satellite into orbit.

55. The method according to claim 54 wherein the satellite is launched into one of the groups consisting of (i) a geostationary orbit, and (ii) a geosynchronous orbit.

56. A method of operating a satellite communications system for mobile terminals, wherein the satellite communications system comprises:

a mobile user terminal comprising a small antenna having an aperture area with a diameter of less than about 50 cm, and one or more satellites having a regenerative payload, a demodulator for demodulating an uplink signal sent by the mobile user terminal and received by the satellite, an onboard computer and a payload interface, wherein the payload interface is coupled to the regenerative payload, the onboard computer and an onboard interference elimination system to enable an onboard interference analysis of the uplink signal after it has been demodulated, and the satellite communications system is optimized for a link margin of 5 dB or less, the method comprising the steps of;

adjusting the satellite communications system from a first frequency band to a second frequency band that is less populated than the first frequency band;

monitoring for interference towards adjacent satellites from the uplink signal; and

remedying the interference when the interference to the adjacent satellites from the uplink signal is detected.

57. The method according to claim 56 wherein the monitoring is continuously preformed.

58. The method according to claim 56 wherein the interference is remedied by means of at least one of the group consisting of (i) shutting down the mobile user terminal, (ii) changing transmission parameters, (iii) changing beam coverage, (iv) changing frequency of affected signal traffic, and (v) moving the satellite to another orbital position.

59. The method according to claim 56 further comprising the step of transmitting interference information to a control center.

60. The method according to claim 56 further comprising the step of transmitting interference information to a control center only if interference to adjacent satellites from the uplink signal is at least one of (i) indicated and (ii) detected.