Ronald L Hatch

US Patent:

7679555, Mar 16, 2010

Filed:

Dec 22, 2008

Appl. No.:

12/341969

Inventors:

Liwen L. Dai - Chino Hills CA, US
Chaochao Wang - Los Angeles CA, US
Daniel J. Eslinger - Huntington Beach CA, US
Ronald R. Hatch - Wilmington CA, US
Richard T. Sharpe - Torrance CA, US

Assignee:

Navcom Technology, Inc. - Torrance CA

International Classification:

G01S 5/14

US Classification:

34235703, 34235704

Abstract:

A mobile satellite navigation receiver for calculating an offset between a local positioning system and a wide-area satellite positioning system is presented. The mobile satellite navigation receiver determines a first solution of a position of the mobile satellite navigation receiver relative to a first local positioning system, wherein the first local positioning system includes one or more reference receivers at known locations. The mobile satellite navigation receiver determines a second solution of the position of the satellite navigation receiver relative to a wide-area differential satellite positioning system. The mobile satellite navigation receiver then calculates an offset between the first solution and the second solution.

US Patent:

20120176271, Jul 12, 2012

Filed:

Nov 17, 2011

Appl. No.:

13/299324

Inventors:

Liwen L. Dai - Chino Hills CA, US
Ronald R. Hatch - Wilmington CA, US
Yujie Zhang - Lomita CA, US
Min Wang - Irvine CA, US

International Classification:

G01S 19/07

US Classification:

34235744

Abstract:

A system and method for providing improved correction information to navigation receivers includes receiving, from a plurality of reference stations at known locations, a plurality of satellite navigation measurements of signals from a plurality of global navigation satellites. A state of the plurality of global navigation satellites is computed based on the received satellite navigation measurements. Baselines, each corresponding to a pair of the reference stations, are identified. For each identified baseline, computing floating and integer values for a double-differenced integer ambiguity. Double-differenced integer ambiguities that satisfy a set of predefined conditions are identified, and the computed state of the plurality of global navigation satellites is adjusted in accordance with an integer value constraint applied to each double-differenced integer ambiguity that satisfies the set of predefined conditions. The correction information is computed from the adjusted computed state of the plurality of global navigation satellites.