Rockwell Collins, Inc.

Paul D Linhart

Steven D Deines

A method of estimating the carrier phase difference between two antennas under low signal conditions (typically called state,) 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.

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Cedar Rapids, IA, United States of America

Paul D Linhart