Patent Number: 6,297,769

Title: System and method to estimate carrier signal in global positioning systems (GPS)

Abstract: A method of estimating the carrier phase difference between two antennas under low signal conditions (typically called state 3) of a global positioning system (GPS) carrier signal transmitted from one of a constellation of satellites in the GPS for use in attitude determination systems is proposed. The method involves the use of multiple antennas tracking the same satellite signal and utilizing a code tracking loop filter to aid in maintaining track of the GPS waveform when the effects of doppler (i.e., the distance from a GPS satellite to the antenna is changing with time) are present.

Inventors: Deines; Steven D. (Marion, IA), Linhart; Paul D. (Cedar Rapids, IA)

Assignee: Rockwell Collins

International Classification: G01S 5/02 (20060101); G01S 5/14 (20060101); G01S 1/00 (20060101); H04B 007/185 ()

Expiration Date: 10/02/2018