08085196 is referenced by 27 patents and cites 346 patents.

A method for removing biases in dual frequency GNSS receivers circumvents the need for ionosphere corrections by using L2(P) in combination with either L1(P) or L1(C/A) to form ionosphere-free ranges. A table of biases is stored in microprocessor controller memory and utilized for computing a location using corrected ionosphere-free pseudo ranges. A system for removing biases in dual frequency GNSS receivers includes a dual frequency GNSS receiver and a controller microprocessor adapted to store a table of bias values for correcting pseudo ranges determined using L2(P) in combination with either L1(P) or L1(C/A).

Title
Removing biases in dual frequency GNSS receivers using SBAS
Application Number
12/401948
Publication Number
8085196 (B2)
Application Date
March 11, 2009
Publication Date
December 27, 2011
Inventor
Michael L Whitehead
Scottsdale
AZ, US
Agent
Mark E Brown
Law Office of Mark Brown
Assignee
Hemisphere GPS
CA
IPC
G01S 19/40
G01S 19/07
View Original Source