Positioning with Time Sliced Single Frequency Networks

• US 20090070847A1
• Filed: 07/06/2008
• Published: 03/12/2009
• Est. Priority Date: 07/06/2007
• Status: Abandoned Application

• Current Assignee: TruePosition Incorporated
• Original Assignee: Rosum Corporation (Liberty Broadband Corp.)
• Inventors: Opshaug, Guttorm, Furman, Scott, Burgess, David
• Application Number:
  US12/168,141
• Publication Number:
  US 20090070847A1
• Time in Patent Office: Days
• US Class Current: 725/131
• CPC Class Codes: G01S 1/30 the synchronised signals being continuous waves or intermittent trains of continuous waves, the intermittency not being for the purpose of determining direction or position line and the transit times being compared by measuring the phase difference
• CPC Class Codes: G01S 5/0226 Transmitters

Abstract

Apparatus having corresponding methods and computer-readable media comprise an input circuit to receive a transport stream of data, wherein the transport stream has periodic synchronization boundaries; a signal generator to provide a ranging signal, wherein the ranging signal represents a transmitter identifier; and a ranging time slice inserter to insert ranging time slices into the transport stream, wherein each ranging time slice is inserted into the transport stream at the same predetermined offset from a respective one of the periodic synchronization boundaries, and wherein each ranging time slice includes the ranging signal.

Claims

1. An apparatus comprising:

an input circuit to receive a transport stream of data, wherein the transport stream has periodic synchronization boundaries;

a signal generator to provide a ranging signal, wherein the ranging signal represents a transmitter identifier; and

a ranging time slice inserter to insert ranging time slices into the transport stream, wherein each ranging time slice is inserted into the transport stream at the same predetermined offset from a respective one of the periodic synchronization boundaries, and wherein each ranging time slice includes the ranging signal.

2. The apparatus of claim 1:

wherein the transport stream includes a plurality of program time slices each associated with one of a plurality of program identifiers, wherein the program time slices associated with a predetermined one of the program identifiers occur at the predetermined offset from the periodic synchronization boundaries; and

wherein the ranging time slice inserter replaces the program time slices associated with the predetermined one of the program identifiers with the ranging time slices.

3. The apparatus of claim 2:

wherein the transport stream is a Digital Video Broadcasting-Handheld (DVB-H) transport stream; and

wherein the periodic synchronization boundaries are DVB-H megaframe boundaries.

4. The apparatus of claim 3, wherein the ranging signals comprise at least one of:

DVB-H cyclic prefixes;

DVB-H scattered pilot signals; and

DVB-H continuous pilot signals.

5. The apparatus of claim 4:

wherein the ranging signal includes a pseudorandom sequence; and

wherein the pseudorandom sequence represents the transmitter identifier.

6. A modulator comprising the apparatus of claim 1.

7. A transmitter comprising the modulator of claim 6, wherein the transmitter is associated with the transmitter identifier.

8. An apparatus comprising:

input means for receiving a transport stream of data, wherein the transport stream has periodic synchronization boundaries;

signal generator means for providing a ranging signal, wherein the ranging signal represents a transmitter identifier; and

ranging time slice inserter means for inserting ranging time slices into the transport stream, wherein each ranging time slice is inserted into the transport stream at the same predetermined offset from a respective one of the periodic synchronization boundaries, and wherein each ranging time slice includes the ranging signal.

9. The apparatus of claim 8:

wherein the transport stream includes a plurality of program time slices each associated with one of a plurality of program identifiers, wherein the program time slices associated with a predetermined one of the program identifiers occur at the predetermined offset from the periodic synchronization boundaries; and

wherein the ranging time slice inserter means replaces the program time slices associated with the predetermined one of the program identifiers with the ranging time slices.

10. The apparatus of claim 9:

wherein the transport stream is a Digital Video Broadcasting-Handheld (DVB-H) transport stream; and

wherein the periodic synchronization boundaries are DVB-H megaframe boundaries.

11. The apparatus of claim 10, wherein the ranging signals comprise at least one of:

DVB-H cyclic prefixes;

DVB-H scattered pilot signals; and

DVB-H continuous pilot signals.

12. The apparatus of claim 11:

wherein the ranging signal includes a pseudorandom sequence; and

wherein the pseudorandom sequence represents the transmitter identifier.

13. A modulator comprising the apparatus of claim 8.

14. A transmitter comprising the modulator of claim 13, wherein the transmitter is associated with the transmitter identifier.

15. Computer-readable media embodying instructions executable by a computer to perform a method comprising:

receiving a transport stream of data, wherein the transport stream has periodic synchronization boundaries;

providing a ranging signal, wherein the ranging signal represents a transmitter identifier; and

inserting ranging time slices into the transport stream, wherein each ranging time slice is inserted into the transport stream at the same predetermined offset from a respective one of the periodic synchronization boundaries, and wherein each ranging time slice includes the ranging signal.

16. The computer-readable media of claim 15:

wherein the transport stream includes a plurality of program time slices each associated with one of a plurality of program identifiers, wherein the program time slices associated with a predetermined one of the program identifiers occur at the predetermined offset from the periodic synchronization boundaries; and

wherein inserting the ranging time slices into the transport stream includes replacing the program time slices associated with the predetermined one of the program identifiers with the ranging time slices.

17. The computer-readable media of claim 16:

wherein the transport stream is a Digital Video Broadcasting-Handheld (DVB-H) transport stream; and

wherein the periodic synchronization boundaries are DVB-H megaframe boundaries.

18. The computer-readable media of claim 17, wherein the ranging signals comprise at least one of:

DVB-H cyclic prefixes;

DVB-H scattered pilot signals; and

DVB-H continuous pilot signals.

19. The computer-readable media of claim 18:

wherein the ranging signal includes a pseudorandom sequence; and

wherein the pseudorandom sequence represents the transmitter identifier.

20. An apparatus comprising:

a receiver to receive a wireless signal, wherein the wireless signal represents a transport stream of data, wherein the transport stream has periodic synchronization boundaries, and wherein the transport stream includes a plurality of ranging time slices each occurring at the same predetermined offset from a respective one of the periodic synchronization boundaries, and wherein each of the ranging time slices includes a ranging signal; and

a range module to determine a pseudorange between the apparatus and the transmitter of the wireless signal based on the ranging signal.

21. The apparatus of claim 20:

wherein the transport stream is a Digital Video Broadcasting-Handheld (DVB-H) transport stream; and

wherein the periodic synchronization boundaries are DVB-H megaframe boundaries.

22. The apparatus of claim 21, wherein the ranging signals comprise at least one of:

DVB-H cyclic prefixes;

DVB-H scattered pilot signals; and

DVB-H continuous pilot signals.

23. The apparatus of claim 22:

wherein a location of the apparatus is determined based on the pseudorange between the apparatus and the transmitter of the wireless signal.

24. The apparatus of claim 23, wherein the ranging signal represents a transmitter identifier associated with a transmitter of the wireless signal, and wherein the apparatus further comprises:

a transmitter location module to determine a location of the transmitter of the wireless signal based on the transmitter identifier; and

a position module to determine a location of the apparatus based the location of the transmitter of the wireless signal and the pseudorange between the apparatus and the transmitter of the wireless signal.

25. The apparatus of claim 24:

wherein the ranging signal includes a pseudorandom sequence; and

wherein the pseudorandom sequence represents the transmitter identifier.

26. An apparatus comprising:

receiver means for receiving a wireless signal, wherein the wireless signal represents a transport stream of data, wherein the transport stream has periodic synchronization boundaries, and wherein the transport stream includes a plurality of ranging time slices each occurring at the same predetermined offset from a respective one of the periodic synchronization boundaries, and wherein each of the ranging time slices includes a ranging signal; and

range means for determining a pseudorange between the apparatus and the transmitter of the wireless signal based on the ranging signal.

27. The apparatus of claim 26:

wherein the transport stream is a Digital Video Broadcasting-Handheld (DVB-H) transport stream; and

wherein the periodic synchronization boundaries are DVB-H megaframe boundaries.

28. The apparatus of claim 27, wherein the ranging signals comprise at least one of:

DVB-H cyclic prefixes;

DVB-H scattered pilot signals; and

DVB-H continuous pilot signals.

29. The apparatus of claim 28:

wherein a location of the apparatus is determined based on the pseudorange between the apparatus and the transmitter of the wireless signal.

30. The apparatus of claim 29, wherein the ranging signal represents a transmitter identifier associated with a transmitter of the wireless signal, and wherein the apparatus further comprises:

transmitter location means for determining a location of the transmitter of the wireless signal based on the transmitter identifier; and

position means for determining a location of the apparatus based the location of the transmitter of the wireless signal and the pseudorange between the apparatus and the transmitter of the wireless signal.

31. The apparatus of claim 30:

wherein the ranging signal includes a pseudorandom sequence; and

wherein the pseudorandom sequence represents the transmitter identifier.

32. Computer-readable media embodying instructions executable by a computer to perform a method comprising:

receiving a transport stream of data recovered from a wireless signal received by an apparatus, wherein the transport stream has periodic synchronization boundaries, and wherein the transport stream includes a plurality of ranging time slices each occurring at the same predetermined offset from a respective one of the periodic synchronization boundaries, and wherein each of the ranging time slices includes a ranging signal; and

determining a pseudorange between the apparatus and the transmitter of the wireless signal based on the ranging signal.

33. The computer-readable media of claim 32:

wherein the transport stream is a Digital Video Broadcasting-Handheld (DVB-H) transport stream; and

wherein the periodic synchronization boundaries are DVB-H megaframe boundaries.

34. The computer-readable media of claim 33, wherein the ranging signals comprise at least one of:

DVB-H cyclic prefixes;

DVB-H scattered pilot signals; and

DVB-H continuous pilot signals.

35. The computer-readable media of claim 34:

wherein a location of the apparatus is determined based on the pseudorange between the apparatus and the transmitter of the wireless signal.

36. The computer-readable media of claim 35, wherein the ranging signal represents a transmitter identifier associated with a transmitter of the wireless signal, and wherein the method further comprises:

determining a location of the transmitter of the wireless signal based on the transmitter identifier; and

determining a location of the apparatus based the location of the transmitter of the wireless signal and the pseudorange between the apparatus and the transmitter of the wireless signal.

37. The computer-readable media of claim 36:

wherein the ranging signal includes a pseudorandom sequence; and

wherein the pseudorandom sequence represents the transmitter identifier.