Antenna and satellite alignment using beam projections

• US 8,538,328 B2
• Filed: 08/19/2009
• Issued: 09/17/2013
• Est. Priority Date: 09/11/2008
• Status: Active Grant

• Current Assignee: ViaSat Incorporated
• Original Assignee: ViaSat Incorporated
• Inventors: Mills, Raymond L., Martin, Remberto L.
• Primary Examiner(s): GESESSE, TILAHUN
• Application Number:
  US12/544,130
• Publication Number:
  US 20100062706A1
• Time in Patent Office: 1,490 Days
• Field of Search: 455/13.1, 455/12.1, 455/427, 455/429, 455/67.13, 455/13.3
• US Class Current: 455/13.3
• CPC Class Codes: H04B 7/2041 Spot beam multiple access
• CPC Class Codes: H04H 20/12 Arrangements for observation, testing or troubleshooting
• CPC Class Codes: H04H 20/74 of satellite networks

Abstract

Disclosed is a satellite beam pointing system that uses color encoded signals from subscribers to align antennas on a satellite and to align the satellite. Subscribers detect the signal strength and signal-to-noise ratio of signals that are transmitted from the satellite. The values of the signal strength and signal-to-noise ratio data are encoded in signals that are transmitted back to a ground station that color encodes the data and graphically displays the signal strength and signal-to-noise ratio of the subscriber received signals. The actual beam projection can then be determined and the satellite antennas moved, so that the actual beam projection coincides with the intended beam projection. Also, the satellite can be properly oriented using this technique.

Claims

1. A method of pointing and tracking an antenna on a satellite with respect to an intended beam projection of said satellite antenna, the method comprising:

defining a plurality of intended signal-to-noise ratio perimeters based on an expected attenuation of the intended beam projection at the signal-to-noise ratio perimeters;

categorizing expected attenuation for a plurality of subscribers at known subscriber locations according to the intended signal-to noise ratio perimeters;

receiving, from the plurality of subscribers, signal-to-noise ratio data relating to the signal-to-noise ratio of signals transmitted from said satellite antenna and received at said plurality of known subscriber locations;

analyzing said signal-to-noise ratio data to determine actual attenuation categories for said plurality of subscribers; and

aligning said satellite antenna based at least in part upon a difference between said expected attenuation categories for said plurality of subscribers and said actual attenuation categories for said plurality of subscribers.

2. The method of claim 1, wherein said process of analyzing said signal-to-noise ratio data comprises:

graphically displaying said signal-to-noise ratio data to produce a graphical representation of said actual attenuation categories for said plurality of subscribers; and

determining an actual beam center of said actual beam projection from said graphical representation.

3. The method of claim 2 wherein said process of analyzing said data further comprises:

color encoding said signal-to-noise ratio data relating to said signal-to-noise ratio.

4. The method of claim 1 further comprising:

graphically displaying said signal-to-noise ratio data to produce a graphical representation of said actual attenuation categories for said plurality of subscribers; and

iteratively moving said antennas and viewing said graphical representation until said antennas are properly aligned.

5. The method of claim 1 wherein said step of analyzing said data comprises:

computationally determining an actual beam projection of said satellite antennas from said signal-to-noise ratio data without graphically displaying said signal-to-noise ratio data.

6. The method of claim 5 wherein said step of computationally determining said actual beam projection further comprises:

computationally determining an actual beam center from said signal-to-noise ratio data.

7. A method of pointing and tracking an antenna on a satellite with respect to an intended beam projection of said satellite antenna, the method comprising:

defining a plurality of intended signal strength perimeters based on an expected attenuation of the intended beam projection at the signal strength perimeters;

categorizing expected attenuation for a plurality of subscribers at known subscriber locations according to the intended signal strength perimeters;

receiving, from the plurality of subscribers, signal strength data relating to the signal strength of signals transmitted from said satellite antenna and received at said plurality of known subscriber locations;

analyzing said signal strength data to determine actual attenuation categories for said plurality of subscribers;

aligning said satellite antenna based at least in part upon a difference between said expected attenuation categories for said plurality of subscribers and said actual attenuation categories for said plurality of subscribers.

8. The method of claim 7 wherein said process of analyzing said signal strength data comprises:

graphically displaying said signal strength data to produce a graphical representation of said actual attenuation categories for said plurality of subscribers;

determining an actual beam center of an actual beam projection from said graphical representation.

9. The method of claim 8 wherein said process of analyzing said signal strength data further comprises:

color encoding said signal strength data.

10. The method of claim 7 further comprising:

graphically displaying said signal strength data to produce a graphical representation of said actual attenuation categories for said plurality of subscribers; and

iteratively moving said antenna and viewing said graphical representation until said antenna is properly aligned.

11. The method of claim 7 wherein said step of analyzing said signal strength data comprises:

computationally determining an actual beam projection of said antenna from said signal strength data without graphically displaying said signal strength data.

12. The method of claim 11 wherein said step of computationally determining said actual beam projection further comprises:

computationally determining an actual beam center from said signal strength data.

13. The method of claim 12 wherein said process of aligning said satellite antenna further comprises:

determining a differential distance and angle of said actual beam center from an intended beam center;

generating antenna adjustment data based upon said differential distance and angle; and

transmitting said antenna adjustment data to said satellite to adjust said antenna.

14. A method of aligning a satellite with respect to the earth'"'"'s surface, the method comprising:

defining a plurality of intended signal-to-noise ratio perimeters for each beam transmitted from antennas of said satellite based on expected attenuation of said each beam;

categorizing expected attenuation for a plurality of subscribers at known subscriber locations according to the intended signal-to-noise ratio perimeters;

receiving, from the plurality of subscribers, signal-to-noise ratio data relating to the signal-to-noise ratio of signals transmitted from antennas of said satellite and received at said plurality of known subscriber locations;

analyzing said signal-to-noise ratio data to determine actual attenuation categories for said plurality of subscribers;

comparing said actual actual attenuation categories for said plurality of subscribers with said expected attenuation categories for said plurality of subscribers to create a satellite alignment signal; and

aligning said satellite with respect to said earth'"'"'s surface using said satellite alignment signal.

15. The method of claim 14 wherein said process of analyzing said signal-to-noise ratio data comprises:

graphically displaying said signal-to-noise ratio data to produce graphical representations of said actual attenuation categories for said plurality of subscribers; and

determining actual beam centers of actual beam projections from said graphical representations.

16. The method of claim 15 wherein said process of analyzing said signal-to-noise ratio data further comprises:

color encoding said signal-to-noise ratio data.

17. The method of claim 14 further comprising:

graphically displaying said signal-to-noise ratio data to produce graphical representations of said actual attenuation categories for said plurality of subscribers;

iteratively moving said satellite and viewing said graphical representations of said actual attenuation categories for said plurality of subscribers until said satellite is properly aligned.

18. The method of claim 14 wherein said step of analyzing said data comprises:

computationally determining actual beam projections of said antennas from said signal-to-noise ratio data without graphically displaying said signal-to-noise ratio data.

19. The method of claim 18 wherein said step of computationally determining said actual locations of said beam projections further comprises:

computationally determining actual beam centers of said actual beam projections from said signal-to-noise ratio data.

20. A method of aligning a satellite with respect to the earth'"'"'s surface, the method comprising:

defining a plurality of intended signal strength perimeters for each beam transmitted for antennas of said satellite based on expected attenuation of said each beam;

categorizing expected attenuation for a plurality of subscribers at known subscriber locations according to the intended signal strength perimeters;

receiving, from the plurality of subscribers, signal strength data relating to the signal strength of signals transmitted from antennas of said satellite and received at said plurality of known subscriber locations;

analyzing said signal strength data to determine actual attenuation categories for said plurality of subscribers;

comparing said actual attenuation categories for said plurality of subscribers with said expected attenuation categories for said plurality of subscribers to create a satellite alignment signal; and

aligning said satellite with respect to said earth'"'"'s surface using said satellite alignment signal.

21. The method of claim 20 wherein said process of analyzing said signal strength data comprises:

graphically displaying said signal strength data to produce graphical representations of said actual attenuation categories for said plurality of subscribers; and

determining actual beam centers of actual beam projections from said graphical representations.

22. The method of claim 21 wherein said process of analyzing said signal strength data further comprises:

color encoding said signal strength data.

23. The method of claim 20 further comprising:

graphically displaying said signal strength data to produce graphical representations of said actual attenuation categories for said plurality of subscribers; and

iteratively moving said satellite and viewing said graphical representations of said actual attenuation categories for said plurality of subscribers until said satellite is properly aligned.

24. The method of claim 20 wherein said step of analyzing said signal strength data comprises:

computationally determining actual beam projections of said antennas from said signal strength data.

25. The method of claim 24 wherein said step of computationally determining said actual beam projections further comprises:

computationally determining actual beam centers of said actual beam projections from said signal strength data.

26. The method of claim 25 wherein said process of aligning said stationary satellite further comprises:

determining differential distances and angles of said actual beam centers with respect to intended beam centers;

generating satellite adjustment data based upon said differential distances and angles; and

transmitting said satellite adjustment data to said satellite to adjust said satellite.

27. A system for aligning an antenna on a satellite with respect to an intended beam projection comprising:

a plurality of subscriber transceivers at known subscriber locations that receive downstream signals transmitted from said satellite antenna and transmit upstream signals;

a plurality of subscriber modems coupled to said plurality of subscriber transceivers that determine signal-to-noise ratio data of said downstream signals and encode said upstream signals with said signal-to-noise ratio data;

a control system that defines a plurality of intended signal-to-noise ratio perimeters based on an expected attenuation of the intended beam projection at the signal-to-noise ratio perimeters, categorizes expected attenuation for the plurality of subscriber transceivers according to the intended signal-to-noise ratio perimeters, receives said plurality of upstream signals, extracts said signal-to-noise ratio data from said upstream signals, analyzes said signal-to-noise ratio data to determine actual attenuation categories for said plurality of subscriber transceivers, compares said actual attenuation categories for said plurality of subscriber transceivers with said expected attenuation categories for said plurality of subscriber transceivers to produce an antenna alignment signal, and encodes a control with said antenna alignment signal to align said antenna.

28. The system of claim 27 further comprising:

a display that graphically displays said actual attenuation categories for said plurality of subscribers transceivers.

29. The system of claim 28 wherein said graphical display further comprises:

a display that graphically displays color encoded signal-to-noise ratio data.

30. A system for aligning an antenna on a satellite with respect to an intended beam projection comprising:

a plurality of subscriber transceivers at known subscriber locations that receive said downstream signals transmitted from said satellite antenna and transmit upstream signals;

a plurality of subscriber modems coupled to said plurality of subscriber transceivers that determine signal strength data of said downstream signals and encode said upstream signals with said signal strength data;

a control system that defines a plurality of intended signal strength perimeters based on an expected attenuation of the intended beam projection at the signal strength perimeters, categorizes expected attenuation for the plurality of subscriber transceivers according to the intended signal strength perimeters, receives said plurality of upstream signals, extracts said signal strength data from said upstream signals, analyzes said signal strength data to determine actual attenuation categories for said plurality of subscriber transceivers, compares said actual attenuation categories for said plurality of subscriber transceivers with said expected attenuation categories for said plurality of subscriber transceivers to produce an antenna alignment signal, and encodes a control signal with said antenna alignment signal to align said antenna.

31. The system of claim 30 further comprising:

a display that graphically displays said actual attenuation categories for said plurality of subscriber transceivers.

32. The system of claim 31 wherein said graphical display further comprises:

a display that graphically displays color encoded signal strength data.

33. A system for aligning a satellite with respect to the earth'"'"'s surface comprising:

a plurality of subscriber transceivers at known subscriber locations that receive downstream signals from said satellite and transmit upstream signals;

a plurality of subscriber modems coupled with said plurality of subscriber transceivers that determine signal-to-noise ratio data of said downstream signals and encode said upstream signals with said signal-to-noise ratio data;

a control system that defines a plurality of intended signal-to-noise ratio perimeters for each beam transmitted from antennas of said satellite based on expected attenuation of said each beam, categorizes expected attenuation for the plurality of subscriber transceivers according to the intended signal-to-noise ratio perimeters, receives said plurality of upstream signals, extracts said signal-to-noise ratio data from said upstream signals, analyzes said signal-to-noise ratio data to determine actual attenuation categories for said plurality of subscriber transceivers, compares said actual attenuation categories for said plurality of subscriber transceivers with said expected attenuation categories for said plurality of subscriber transceivers to produce a satellite alignment signal, and encodes a control signal with said satellite alignment signal to align said satellite.

34. The system of claim 33 further comprising:

a display that graphically displays said actual attenuation categories for said plurality of subscriber transceivers.

35. The system of claim 34 wherein said graphical display further comprises:

a display that graphically displays color encoded signal-to-noise ratio data.

36. A system for aligning a satellite with respect to the earth'"'"'s surface comprising:

a plurality of subscriber transceivers at known subscriber locations that receive downstream signals from said satellite and transmit upstream signals;

a plurality of subscriber modems coupled with said plurality of subscriber transceivers that determine signal strength data of said downstream signals and encode said upstream signals with said signal strength data;

a control system that defines a plurality of intended signal strength perimeters for each beam transmitted from antennas of said satellite based on expected attenuation of said each beam, categorizes expected attenuation for the plurality of subscriber transceivers according to the intended signal strength perimeters, receives said plurality of upstream signals, extracts said signal strength data from said upstream signals, analyzes said signal strength data to determine actual attenuation categories for said plurality of subscriber transceivers, compares said actual attenuation categories for said plurality of subscriber transceivers with said expected attenuation categories for said plurality of subscriber transceivers to produce a satellite alignment signal, and encodes a control signal with said satellite alignment signal to align said satellite.

37. The system of claim 36 further comprising:

a display that graphically displays said actual attenuation categories for said plurality of subscriber transceivers.

38. The system of claim 37 wherein said graphical display farther comprises:

a display that graphically displays color encoded signal strength data.