Enhanced aiding in GPS systems

• US 7,724,186 B2
• Filed: 06/29/2007
• Issued: 05/25/2010
• Est. Priority Date: 06/30/2006
• Status: Expired due to Fees

• Current Assignee: CSR Technology Incorporated (Qualcomm, Inc.)
• Original Assignee: SIRF Technology Incorporated (Qualcomm, Inc.)
• Inventors: Zhang, Gengsheng, Garin, Lionel, Wan, Marlene
• Primary Examiner(s): Tarcza; Thomas H
• Assistant Examiner(s): LIU, HARRY K
• Application Number:
  US11/772,102
• Publication Number:
  US 20080122690A1
• Time in Patent Office: 1,061 Days
• Field of Search: 34235701-35714
• US Class Current: 342/357.42
• CPC Class Codes: G01C 21/206 specially adapted for indoor navigation
• CPC Class Codes: G01S 19/05 providing aiding data
• CPC Class Codes: G01S 19/48 by combining or switching between position solutions derived from the satellite radio beacon positioning system and position solutions derived from a further system

Abstract

An Aided Location Communication System (“ALCS”) is described. The ALCS may include a geolocation server including a non-GPS position server, at least one server aiding database, server position-determination module, and a server fusion module. The ALCS may also include an Aided Location Communication Device (“ALCD”) including a communication section in signal communication with the geolocation server, and a position-determination section having a GPS Engine.

Claims

1. An Aided Location Communication System (“

ALCS”

), comprising;

an geolocation server including a non-GPS position server, at least one server aiding database, server position-determination module, and a server fusion module; and

an Aided Location Communication Device (“

ALCD”

) including a communication section in signal communication with the geolocation server, and a position-determination section having a GPS Engine,

wherein the ALCD is capable of selectively switching between a first position-determination mode for determining a geolocation of the ALCD and a second position-determination mode for determining the geolocation of the ALCD,

wherein the geolocation server further includes a GPS section, and

wherein the at least one server aiding database includes a server environmental database and a server dynamic learned environmental (“

DLE”

) database, and

wherein the position-determination section further includes at least one client aiding database, a client position-determination modules and a client fusion module, and

wherein the at least one server aiding database includes a server environmental database and a server dynamic learned environmental (“

DLE”

) database and wherein the at least one client aiding database includes a client environmental database and a client DLE database, and

wherein the position-determination section further includes at least one sensor, and

wherein the server position determination module is in signal communication with the GPS section, non-GPS positioning server, at least one server aiding database, and server fusion module, and wherein the server position determination module is configured to receive GPS data from the GPS section, non-GPS positioning data from the non-GPS positioning server, and database data from the at least one server aiding database, and in response produce position-determination data that is passed to the server fusion module, and

wherein the server fusion module is in signal communication with the at least one aiding database, and wherein the server fusion module is configured to receive the position-determination data and fuse it together.

2. The ALCS of claim 1, wherein the ALCD is capable of selectively operating simultaneously in the first position-determination mode and the second position-determination mode.

3. A method for determining the geolocation of an Aided Location Communication Device (“

ALCDD”

), having a position-determination section and a communication section, within an Aided Location Communication System (“

ALCS”

), the method comprising;

measuring characteristic information for a communication network of the ALCS;

comparing the measured characteristic information against position data stored in an aiding database;

determining an initial coarse position for the ALCD based on the comparison of the measured characteristic information against position data stored in an aiding database;

determining whether the initial coarse position is acceptable;

determining the position of the ALCD if the initial coarse position is not acceptable;

fusing the measured characteristic information with the initial coarse position if the initial position is acceptable or fusing the measured characteristic information with the determined position if the initial position is not acceptable; and

updating the aiding database with the fused data.

4. The method of claim 3, wherein determining the position of the ALCD if the initial coarse position is not acceptable includes determining the position of the ALCD selectively utilizing GPS signals or non-GPS aiding signals.

5. The method of claim 4, wherein fusing the measured characteristic information with the determined position if the initial position is not acceptable includes fusing the measured characteristic information with the determined position and GPS data derived from the GPS signals.

6. The method of claim 4, wherein fusing the measured characteristic information with the determined position if the initial position is not acceptable includes fusing the measured characteristic information with the determined position and non-GPS data derived from the non-GPS aiding signals.

7. The method of claim 4, wherein determining whether the initial coarse position is acceptable includes determining whether a predetermined event has occurred.

8. The method of claim 3, further including transmitting the measured characteristic information to a Geolocational Server in the ALCS but remote to the ALCD,

wherein measuring characteristic information for a communication network of the ALCS is preformed by the ALCD, and

wherein comparing the measured characteristic information against position data stored in an aiding database is preformed by the Geolocation Server,

wherein determining an initial coarse position for the ALCD based on the comparison of the measured characteristic information against position data stored in an aiding database is preformed by the Geolocation Server,

wherein fusing the measured characteristic information with the initial coarse position if the initial position is acceptable or fusing the measured characteristic information with the determined position if the initial position is not acceptable is preformed by the Geolocation Server, and

wherein updating the aiding database with the fused data is preformed by the Geolocation Server.

9. The method of claim 8, wherein determining the position of the ALCD if the initial coarse position is not acceptable includes determining the position of the ALCD selectively utilizing GPS signals or non-GPS aiding signals.

10. The method of claim 9, wherein fusing the measured characteristic information with the determined position if the initial position is not acceptable includes fusing the measured characteristic information with the determined position and GPS data derived from the GPS signals.

11. The method of claim 10, wherein fusing the measured characteristic information with the determined position if the initial position is not acceptable includes fusing the measured characteristic information with the determined position and non-GPS data derived from the non-GPS aiding signals.