Accession Number:

ADA508387

Title:

Time Transfer Using GPS Carrier Phase Methods

Descriptive Note:

Conference paper

Corporate Author:

COLORADO UNIV AT BOULDER DEPT OF AEROSPACE ENGINEERING SCIENCES

Personal Author(s):

Report Date:

1997-12-01

Pagination or Media Count:

8.0

Abstract:

We have conducted several time-transfer experiments using the phase of the GPS carrier rather than the code, as is done in current GPS-based time transfer systems. We used data from geodetic quality off-the-shelf dual-frequency GPS receivers, where up to 8 satellites can be simultaneously observed. We connected two GPS receivers to two different atomic clocks at NIST. The antennas connected to the receivers were separated by about 40 m. The time difference between the clocks connected to the GPS receivers was estimated using weighted least-squares methods and carrier phase data. These relative clock estimates were then compared with the NIST time-scale system. We find agreement between the two methods of 55-80 picoseconds over periods of a week.

Subject Categories:

  • Navigation and Guidance

Distribution Statement:

APPROVED FOR PUBLIC RELEASE