Remote node providing GPS signal samples for GPS positioning over a communication network

• US 20080068262A1
• Filed: 08/25/2006
• Published: 03/20/2008
• Est. Priority Date: 08/25/2006
• Status: Abandoned Application

• Current Assignee: Trimble Navigation Limited (Trimble Inc.)
• Original Assignee: Trimble Navigation Limited (Trimble Inc.)
• Inventors: Loomis, Peter Van Wyck
• Application Number:
  US11/510,225
• Publication Number:
  US 20080068262A1
• Time in Patent Office: Days
• US Class Current: 342/357.09
• CPC Class Codes: G01S 19/39 the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
• CPC Class Codes: G01S 5/0036 of measured values, i.e. measurement on mobile and position calculation on base station

Abstract

A GPS positioning system having a remote node and a network-aided GPS node locator. The remote node samples a GPS signal and transmits the GPS signal samples through a communication network having an intermediate node. The GPS node locator receives the GPS signal samples through the communication network, geolocates the intermediate node from a node ID, and uses the GNSS signal samples with the intermediate node geographical location for determining the geographical location of the remote node.

Claims

1. A method in a remote node for operation with a communication network for determining a global navigation satellite system (GNSS)-based location of the remote node, comprising:

receiving a GNSS signal;

digitizing said GNSS signal for providing GNSS signal samples; and

transmitting said GNSS signal samples through a communication network having an intermediate node having a node ID for reception by a GNSS node locator, said GNSS node locator constructed for geolocating said node ID for determining a geographical location of said intermediate node and using said intermediate node location with said GNSS signal samples for determining a GNSS-based geographical location of the remote node.

2. The method of claim 1, wherein:

determining said GNSS-based remote node location includes using said intermediate node location as an approximate geographical location of said remote node;

using said GNSS signal samples for determining code correlation time offsets; and

using said code correlation time offsets for refining said approximate location for determining said GNSS-based remote node location.

3. The method of claim 1, wherein:

said intermediate node is an Internet Service Provider (ISP) acting as an entry point for said remote node into said communication network and said node ID is an Internet Protocol (IP) address for said ISP.

4. The method of claim 1, wherein:

said intermediate node is a cell having a transponder for receiving a wireless signal carrying said GNSS signal samples from the remote modem and said node ID is an identifier for said cell.

5. The method of claim 1, further comprising:

receiving a network clock time associated with said communication network;

using said network clock time for time tagging a time when said GNSS signal is received; and

transmitting said network clock time tag through said communication network for reception by said GNSS node locator, said GNSS node locator constructed for using said network clock time tag for determining a location-in-space for a GNSS satellite; and

using said GNSS satellite location-in-space for determining said GNSS-based remote node location.

6. The method of claim 5, wherein:

determining said GNSS-based remote node location includes using said GNSS satellite location-in-space and said intermediate node location for determining a unit vector between said GNSS satellite and said intermediate node; and

using said unit vector for determining said GNSS-based remote node location.

7. The method of claim 5, wherein:

determining said GNSS-based remote node location includes using said GNSS satellite location-in-space and said intermediate node location for calculating a range between said GNSS satellite and said intermediate node; and

using said calculated range for determining said GNSS-based remote node location.

8. The method of claim 1, wherein:

transmitting said GNSS signal samples through said communication network includes transmitting said signal samples from said intermediate node a distance of more than one-hundred fifty kilometers to said GNSS node locator.

9. The method of claim 1, wherein:

said remote node location is independent of said intermediate node location.

10. The method of claim 1, wherein:

transmitting said GNSS signal samples through said communication network includes transmitting said signal samples over a distance of more than one-half a code cycle time period of said GNSS signal divided by the speed of light.

11. A remote node apparatus for operation with a communication network for determining a global navigation satellite system (GNSS)-based location of the remote node, comprising:

a GNSS antenna for receiving a GNSS signal;

a digitizer for sampling said GNSS signal for providing GNSS signal samples; and

a remote modem for transmitting said GNSS signal samples through a communication network having an intermediate node having a node ID for reception by a GNSS node locator, said GNSS node locator constructed for geolocating said node ID for determining a geographical location of said intermediate node and using said intermediate node location with said GNSS signal samples for determining a GNSS-based geographical location of the remote node.

12. The apparatus of claim 11, wherein:

said GNSS node locator is constructed for using said intermediate node location as an approximate geographical location of said remote node;

using said GNSS signal samples for determining code correlation time offsets; and

using said code correlation time offsets for refining said approximate location for determining said GNSS-based remote node location.

13. The apparatus of claim 11, wherein:

said intermediate node is an Internet Service Provider (ISP) acting as an entry point for said remote node into said communication network and said node ID is an Internet Protocol (IP) address for said ISP.

14. The apparatus of claim 11, wherein:

said intermediate node is a cell having a transponder for receiving a wireless signal carrying said GNSS signal samples from the remote modem and said node ID is an identifier for said cell.

15. The apparatus of claim 11, further comprising:

a time tagger for receiving a network clock time associated with said communication network and using said network clock time for time tagging a time when said GNSS signal is received; and

wherein;

the remote modem is constructed for transmitting said network clock time tag through said communication network for reception by said GNSS node locator, said GNSS node locator constructed for using said network clock time tag for determining a location-in-space for a GNSS satellite and using said GNSS satellite location-in-space for determining said GNSS-based remote node location.

16. The apparatus of claim 15, wherein:

said GNSS remote node locator is constructed for using said GNSS satellite location-in-space and said intermediate node location for determining a unit vector between said GNSS satellite and said intermediate node, and using said unit vector for determining said GNSS-based remote node location.

17. The apparatus of claim 15, wherein:

said GNSS remote node locator is constructed for using said GNSS satellite location-in-space and said intermediate node location for calculating a range between said GNSS satellite and said intermediate node, and using said calculated range for determining said GNSS-based remote node location.

18. The apparatus of claim 11, wherein:

said GNSS node locator is located more than one-hundred fifty kilometers from said intermediate node.

19. The apparatus of claim 11, wherein:

said remote node location is independent of said intermediate node location.

20. The apparatus of claim 11, wherein:

said GNSS node locator is separated from said intermediate node by a distance of more than one-half a code cycle time period of said GNSS signal divided by the speed of light; and

said remote node location is independent of said intermediate node location.