Position location using broadcast digital television signals comprising pseudonoise sequences

• US 20040150559A1
• Filed: 09/09/2003
• Published: 08/05/2004
• Est. Priority Date: 08/17/2001
• Status: Active Grant

• Current Assignee: TruePosition Incorporated
• Original Assignee: Rosum Corporation (Liberty Broadband Corp.)
• Inventors: Spilker, James J. Jr., Omura, Jimmy K.
• Granted Patent: US 6,914,560 B2
• Time in Patent Office: Days
• US Class Current: 342/458
• CPC Class Codes: A63F 2300/205 for detecting the geographical location of the game platform
• CPC Class Codes: G01C 21/206 specially adapted for indoor navigation
• CPC Class Codes: G01S 19/09 providing processing capability normally carried out by the receiver
• CPC Class Codes: G01S 19/46 the supplementary measurement being of a radio-wave signal type
• CPC Class Codes: G01S 5/0036 of measured values, i.e. measurement on mobile and position calculation on base station
• CPC Class Codes: G01S 5/0054 of actual mobile position, i.e. position calculation on base station
• CPC Class Codes: G01S 5/0081 Transmission between base stations
• CPC Class Codes: G01S 5/02 using radio waves using satellite radio beacon systems for determining position G01S19/00
• CPC Class Codes: G01S 5/021 Calibration, monitoring or correction G01S5/0252 takes precedence
• CPC Class Codes: G01S 5/0221 Receivers
• CPC Class Codes: G01S 5/0226 Transmitters
• CPC Class Codes: G01S 5/0236 Assistance data, e.g. base station almanac
• CPC Class Codes: G01S 5/14 Determining absolute distances from a plurality of spaced points of known location
• CPC Class Codes: G01S 5/145 Using a supplementary range measurement, e.g. based on pseudo-range measurements
• CPC Class Codes: H04N 21/25841 involving the geographical location of the client retrieval from the Internet by querying based on geographical locations G06F16/9537; arrangements for identifying locations of receiving stations in broadcast systems H04H60/51; location of the user terminal in data switching networks H04L67/52; services making use of the location of users or terminals in wireless networks H04W4/02; locating users or terminals in wireless networks H04W64/00
• CPC Class Codes: H04N 21/2668 Creating a channel for a dedicated end-user group, e.g. insertion of targeted commercials based on end-user profiles information retrieval from the Internet by querying with filtering and personalisation G06F16/9535; arrangements for replacing or switching information during the broadcast H04H20/10; push services over packet-switching network H04L12/1859; adaptation of message content in packet-switching networks H04L51/063
• CPC Class Codes: H04N 21/41422 located in transportation means, e.g. personal vehicle arrangements specially adapted for transportation systems in broadcast systems H04H20/62
• CPC Class Codes: H04N 21/615 Signal processing at physical level signal processing in analog two-way television systems H04N7/173
• CPC Class Codes: H04N 21/8126 involving additional data, e.g. news, sports, stocks, weather forecasts

Abstract

A user terminal comprises a receiver adapted to receive, at the user terminal, a broadcast digital television signal transmitted by a television transmitter and comprising a pseudo-noise code; and a controller adapted to generate a pseudorange based on the pseudo-noise code; wherein the location of the user terminal is determined based on the pseudorange and a location of the television transmitter.

Claims

1. A user terminal comprising:

a receiver adapted to receive, at the user terminal, a broadcast digital television signal transmitted by a television transmitter and comprising a pseudo-noise code; and

a controller adapted to generate a pseudorange based on the pseudo-noise code;

wherein the location of the user terminal is determined based on the pseudorange and a location of the telelvision transmitter.

2. The user terminal of claim 1, wherein the broadcast digital television signal is an American Television Standards Committee (ATSC) digital television signal.

3. The user terminal of claim 2, wherein the pseudonoise code is a Global Positioning System L5 code.

4. The user terminal of claim 1, further comprising:

a processor adapted to determine the location of the user terminal based on the pseudorange and the location of the identified telelvision transmitter.

5. The user terminal of claim 1, further comprising:

a time-gated delay-lock loop adapted to track the broadcast digital television signal.

6. A user terminal comprising:

a receiver adapted to receive, at the user terminal, a broadcast digital television signal transmitted by a television transmitter and comprising a pseudonoise code; and

a controller adapted to generate a pseudorange based on the broadcast digital television signal, and to identify the television transmitter based on the pseudonoise code;

wherein the location of the user terminal is determined based on the pseudorange and a location of the identified telelvision transmitter.

7. The user terminal of claim 6, wherein the broadcast digital television signal is an American Television Standards Committee (ATSC) digital television signal.

8. The user terminal of claim 7:

wherein the controller generates the pseudorange based on a known digital sequence comprising at least one of

the pseudonoise code;

a Field Synchronization Segment within an ATSC data frame, and

a Synchronization Segment within a Data Segment within an ATSC data frame.

9. The user terminal of claim 7, wherein the pseudonoise code is a Global Positioning System L5 code.

10. The user terminal of claim 6, further comprising:

a processor adapted to determine the location of the user terminal based on the pseudorange and the location of the identified telelvision transmitter.

11. The user terminal of claim 6, further comprising:

a time-gated delay-lock loop adapted to track the broadcast digital television signal.

12. A user terminal comprising:

receiver means for receiving, at the user terminal, a broadcast digital television signal transmitted by a television transmitter and comprising a pseudo-noise code; and

controller means for generating a pseudorange based on the pseudo-noise code;

wherein the location of the user terminal is determined based on the pseudorange and a location of the telelvision transmitter.

13. The user terminal of claim 12, wherein the broadcast digital television signal is an American Television Standards Committee (ATSC) digital television signal.

14. The user terminal of claim 13, wherein the pseudonoise code is a Global Positioning System L5 code.

15. The user terminal of claim 12, further comprising:

processor means for determining the location of the user terminal based on the pseudorange and the location of the identified telelvision transmitter.

16. A user terminal comprising:

receiver means for receiving, at the user terminal, a broadcast digital television signal transmitted by a television transmitter and comprising a pseudonoise code; and

controller means for generating a pseudorange based on the broadcast digital television signal, and to identify the television transmitter based on the pseudonoise code;

wherein the location of the user terminal is determined based on the pseudorange and a location of the identified telelvision transmitter.

17. The user terminal of claim 16, wherein the broadcast digital television signal is an American Television Standards Committee (ATSC) digital television signal.

18. The user terminal of claim 17:

wherein the controller means generates the pseudorange based on a known digital sequence comprising at least one of

the pseudonoise code;

a Field Synchronization Segment within an ATSC data frame, and

a Synchronization Segment within a Data Segment within an ATSC data frame.

19. The user terminal of claim 17, wherein the pseudonoise code is a Global Positioning System L5 code.

20. The user terminal of claim 16, further comprising:

processor means for determining the location of the user terminal based on the pseudorange and the location of the identified telelvision transmitter.

21. A method comprising:

receiving, at a user terminal, a broadcast digital television signal transmitted by a television transmitter and comprising a pseudo-noise code; and

generating a pseudorange based on the pseudo-noise code;

wherein the location of the user terminal is determined based on the pseudorange and a location of the telelvision transmitter.

22. The method of claim 21, wherein the broadcast digital television signal is an American Television Standards Committee (ATSC) digital television signal.

23. The method of claim 22, wherein the pseudonoise code is a Global Positioning System L5 code.

24. The method of claim 21, further comprising:

determining the location of the user terminal based on the pseudorange and the location of the identified telelvision transmitter.

25. A method comprising:

receiving, at a user terminal, a broadcast digital television signal transmitted by a television transmitter and comprising a pseudonoise code;

generating a pseudorange based on the broadcast digital television signal; and

identifying the television transmitter based on the pseudonoise code;

wherein the location of the user terminal is determined based on the pseudorange and a location of the identified telelvision transmitter.

26. The method of claim 25, wherein the broadcast digital television signal is an American Television Standards Committee (ATSC) digital television signal.

27. The method of claim 26:

wherein the pseudorange is generated based on a known digital sequence comprising at least one of

the pseudonoise code;

a Field Synchronization Segment within an ATSC data frame, and

a Synchronization Segment within a Data Segment within an ATSC data frame.

28. The method of claim 26, wherein the pseudonoise code is a Global Positioning System L5 code.

29. The method of claim 25, further comprising:

determining the location of the user terminal based on the pseudorange and the location of the identified telelvision transmitter.

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

receiving, at a user terminal, a broadcast digital television signal transmitted by a television transmitter and comprising a pseudo-noise code; and

generating a pseudorange based on the pseudo-noise code;

wherein the location of the user terminal is determined based on the pseudorange and a location of the telelvision transmitter.

31. The media of claim 30, wherein the broadcast digital television signal is an American Television Standards Committee (ATSC) digital television signal.

32. The media of claim 31, wherein the pseudonoise code is a Global Positioning System L5 code.

33. The media of claim 30, wherein the method further comprises:

determining the location of the user terminal based on the pseudorange and the location of the identified telelvision transmitter.

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

receiving, at a user terminal, a broadcast digital television signal transmitted by a television transmitter and comprising a pseudonoise code;

generating a pseudorange based on the broadcast digital television signal;

identifying the television transmitter based on the pseudonoise code;

wherein the location of the user terminal is determined based on the pseudorange and a location of the identified telelvision transmitter.

35. The media of claim 34, wherein the broadcast digital television signal is an American Television Standards Committee (ATSC) digital television signal.

36. The media of claim 35:

wherein the pseudorange is generated based on a known digital sequence comprising at least one of

the pseudonoise code;

a Field Synchronization Segment within an ATSC data frame, and

a Synchronization Segment within a Data Segment within an ATSC data frame.

37. The media of claim 35, wherein the pseudonoise code is a Global Positioning System L5 code.

38. The media of claim 34, wherein the method further comprises:

determining the location of the user terminal based on the pseudorange and the location of the identified telelvision transmitter.