LOW EARTH ORBIT SATELLITE DATA UPLINK

• US 20080001819A1
• Filed: 05/16/2007
• Published: 01/03/2008
• Est. Priority Date: 05/18/2006
• Status: Active Grant

• Current Assignee: The Boeing Co.
• Original Assignee: The Boeing Co.
• Inventors: Whelan, David, Cohen, Clark, Gutt, Gregory, Ferrell, Barton, Brumley, Robert
• Granted Patent: US 7,583,225 B2
• Time in Patent Office: Days
• US Class Current: 342/357.16
• CPC Class Codes: H04B 7/1853 Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service for selecting H04W

Abstract

A low earth orbit (LEO) satellite data uplink is provided. In one embodiment, a method of providing a data uplink to a LEO satellite includes determining position information using a LEO signal received from the LEO satellite, a first ranging signal received from a first ranging source, and a second ranging signal received from a second ranging source. The method also includes determining a timing advance parameter using a local clock reference and a LEO satellite clock reference. The method further includes preparing a data uplink signal comprising uplink data to be broadcast to the LEO satellite. In addition, the method includes synchronizing the data uplink signal with the LEO satellite using the timing advance parameter. The method also includes broadcasting the data uplink signal to the LEO satellite.

Claims

1. A method of providing a data uplink to a low earth orbit (LEO) satellite, the method comprising:

determining position information using a LEO signal received from the LEO satellite, a first ranging signal received from a first ranging source, and a second ranging signal received from a second ranging source;

determining a timing advance parameter using a local clock reference and a LEO satellite clock reference;

preparing a data uplink signal comprising uplink data to be broadcast to the LEO satellite;

synchronizing the data uplink signal with the LEO satellite using the timing advance parameter; and

broadcasting the data uplink signal to the LEO satellite.

2. The method of claim 1, further comprising decoding a communication signal from the LEO signal to facilitate two-way communication through the LEO satellite using the data uplink signal and the communication signal.

3. The method of claim 2, wherein the decoding comprises averaging a plurality of single bit measurements of the LEO signal.

4. The method of claim 2, wherein the communication signal and the data uplink signal comprise a telephone call.

5. The method of claim 2, further comprising performing a rekeying operation using the communication signal and the data uplink signal.

6. The method of claim 2, further comprising performing an authentication operation using the communication signal and the data uplink signal.

7. The method of claim 2, further comprising performing air traffic management using the communication signal and the data uplink signal.

8. The method of claim 1, wherein the data uplink signal comprises a beam control request.

9. The method of claim 1, wherein the data uplink signal comprises a global distress call.

10. The method of claim 1, wherein the uplink data comprises the position information.

11. The method of claim 1 wherein the uplink data comprises a text message.

12. The method of claim 1, wherein the data uplink signal comprises a plurality of channels, wherein the channels are distributed over a plurality of frequency bands and a plurality of time slots, wherein the preparing comprises:

generating a pseudo random noise (PRN) overlay comprising the uplink data;

applying the PRN overlay to the channels; and

combining the channels to provide the data uplink signal.

13. The method of claim 1, wherein the navigation signal is selected from the group consisting of a military navigation signal, a commercial navigation signal, and a civilian navigation signal.

14. The method of claim 1, wherein the method is performed by a device selected from the group consisting of a handheld navigation device, a vehicle-based navigation device, and an aircraft-based navigation device.

15. The method of claim 1, wherein the LEO satellite clock reference is provided by the LEO signal.

16. The method of claim 1, wherein the LEO satellite is selected from the group consisting of an Iridium satellite and a Globalstar satellite.

17. The method of claim 1, wherein the preparing comprises encoding a single bit of the uplink data in a plurality of bits.

18. A data uplink device comprising:

an antenna adapted to;

receive a low earth orbit (LEO) signal from a LEO satellite,

receive first and second ranging signals from first and second ranging sources, respectively, and

broadcast a data uplink signal to the LEO satellite; and

a processor adapted to;

determine position information using the LEO signal, the first ranging signal, and the second ranging signal,

determine a timing advance parameter using a local clock reference and a LEO satellite clock reference,

prepare the data uplink signal comprising uplink data to be broadcast to the LEO satellite, and

synchronize the data uplink signal with the LEO satellite using the timing advance parameter.

19. The data uplink device of claim 18, wherein the processor is adapted to decode a communication signal from the LEO signal to facilitate two-way communication through the LEO satellite using the data uplink signal and the communication signal.

20. The data uplink device of claim 19, wherein the processor is adapted to average a plurality of single bit measurements of the LEO signal to decode the communication signal.

21. The data uplink device of claim 19, wherein the communication signal and the data uplink signal comprise a telephone call.

22. The data uplink device of claim 19, wherein the processor is configured to perform a rekeying operation using the communication signal and the data uplink signal.

23. The data uplink device of claim 19, wherein the processor is configured to perform an authentication operation using the communication signal and the data uplink signal.

24. The data uplink device of claim 19, wherein the processor is configured to perform air traffic management using the communication signal and the data uplink signal.

25. The data uplink device of claim 18, wherein the data uplink signal comprises a beam control request.

26. The data uplink device of claim 18, wherein the data uplink signal comprises a global distress call.

27. The data uplink device of claim 18, wherein the uplink data comprises the position information.

28. The data uplink device of claim 18, wherein the uplink data comprises a text message.

29. The data uplink device of claim 18, wherein the data uplink signal comprises a plurality of channels, wherein the channels are distributed over a plurality of frequency bands and a plurality of time slots, wherein the processor is adapted to:

generate a pseudo random noise (PRN) overlay comprising the uplink data;

apply the PRN overlay to the channels; and

combine the channels to provide the data uplink signal.

30. The data uplink device of claim 18, wherein the navigation signal is selected from the group consisting of a military navigation signal, a commercial navigation signal, and a civilian navigation signal.

31. The data uplink device of claim 18, wherein the data uplink device is selected from the group consisting of a handheld navigation device, a vehicle-based navigation device, and an aircraft-based navigation device.

32. The data uplink device of claim 18, wherein the LEO satellite clock reference is provided by the LEO signal.

33. The data uplink device of claim 18, wherein the LEO satellite is selected from the group consisting of an Iridium satellite and a Globalstar satellite.

34. The data uplink device of claim 18, wherein the processor is adapted to encode a single bit of the uplink data in a plurality of bits.

35. A data uplink device comprising:

means for determining position information using a LEO signal received from the LEO satellite, a first ranging signal received from a first ranging source, and a second ranging signal received from a second ranging source;

means for determining a timing advance parameter using a local clock reference and a LEO satellite clock reference;

means for preparing a data uplink signal comprising uplink data to be broadcast to the LEO satellite;

means for synchronizing the data uplink signal with the LEO satellite using the timing advance parameter; and

means for broadcasting the data uplink signal to the LEO satellite.