Method for adjusting a pseudo-range model

• US 6,487,499 B1
• Filed: 11/21/2001
• Issued: 11/26/2002
• Est. Priority Date: 04/23/1999
• Status: Expired due to Fees

• Current Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Original Assignee: Global Locate Incorporated (Broadcom, Inc.)
• Inventors: Abraham, Charles, van Diggelen, Frank, Fuchs, Donald L.
• Primary Examiner(s): Nguyen, Tan
• Assistant Examiner(s): Tran, Dalena
• Application Number:
  US09/990,479
• Time in Patent Office: 370 Days
• Field of Search: 701/213, 701/214, 701/200, 701/225, 701/226, 342/357.06, 342/358, 342/357.09, 342/357.01, 342/357.03, 342/450, 342/356, 455/457, 455/524, 455/575, 340/988
• US Class Current: 701/213
• CPC Class Codes: G01S 19/05 providing aiding data
• CPC Class Codes: G01S 19/06 employing an initial estimate of the location of the receiver as aiding data or in generating aiding data
• CPC Class Codes: G01S 19/09 providing processing capability normally carried out by the receiver
• CPC Class Codes: G01S 19/17 Emergency applications
• CPC Class Codes: G01S 19/235 Calibration of receiver components
• CPC Class Codes: G01S 19/258 relating to the satellite constellation, e.g. almanac, ephemeris data, lists of satellites in view
• CPC Class Codes: G01S 19/27 creating, predicting or correcting ephemeris or almanac data within the receiver
• CPC Class Codes: G01S 19/30 code related G01S19/246 takes precedence
• CPC Class Codes: G01S 2205/002 for traffic control, mobile tracking, guidance, surveillance or anti-collision
• CPC Class Codes: G01S 5/0036 of measured values, i.e. measurement on mobile and position calculation on base station

Abstract

A method and apparatus for locating mobile device over a broad coverage area using a wireless communications link that may have large and unknown latency. The apparatus comprises at least one mobile device, a reference network, a position server, a wireless carrier, and a location requester. The mobile device is in communication with the wireless carrier and receives global positioning system (GPS) signals from a plurality of satellites in the GPS satellite constellation. The reference network is coupled to the position server and provides GPS data. The mobile receiver receives GPS signals, performs rudimentary signal processing and transmits the processed signals to the wireless carrier. The wireless carrier passes the signals on to the position server. The position server processes the mobile receiver'"'"'s GPS data and the reference network ephemeris data to identify the location of the mobile receiver. The location is sent to the location requester.

Claims

1. A method for adjusting a pseudo-range model, comprising:

providing the pseudo-range model to a Global Positioning System (GPS) mobile device;

receiving a wireless signal at the GPS mobile device;

determining a frequency offset between the GPS mobile device and the wireless signal;

determining a time offset between the GPS mobile device and the wireless signal;

using the time offset and the frequency offset to solve for clock error of the GPS mobile device; and

using the clock error to adjust the pseudo-range model.

2. The method of claim 1 wherein the clock error is solved at least in part from,

3. The method of claim 2 wherein the pseudo-range model is at least in part,

4. The method of claim 3 wherein the pseudo-range model after adjustment is,