Capabilities of the WAAS and EGNOS using High Gain Antennas for Time Distribution and Frequency Transfer

Pat Fenton, Ed Powers, Bill Klepczynski, Wlodzimierz Lewandowski and Rob Douglas

Abstract:	The Federal Aviation Authority (FAA) and the European Space Agency (ESA) are currently developing the Wide Area Augmentation System (WAAS) and the European Geostationary Navigation Overlay System (EGNOS). There are several unique advantages of using these new systems for frequency and time transfer: 1. The geostationary satellites are always in view. This offers the ability for multiple sights to be permanently “phase-locked” together by locking themselves to the common satellite signal. 2. The geostationary satellites allow for the use of a high-gain directional antenna that can provide cleaner signals and is less prone to interference and cycle-slips. 3. The geostationary satellite signals are generated and controlled by a network of cesium-based GPS receivers. This provides a very stable reference. 4. These geosatellites (geo) also provide real-time estimates of the ionospheric delay model for the coverage area. This may enable measurements of the L1 signal from the geo to provide dual frequency accuracy levels. This paper contains the results of processing 10 days of data from three widely separated sites. Simultaneous observations were made from the U.S. Naval Observatory (USNO) in Washington, D.C. and from the National Institute of Standards and Technology (NIST) in Boulder, Colorado. This paper shows comparative Time Transfer (TT) and Frequency Transfer (FT) results using a) Dish antenna geosatellite measurement, b) omni directional antenna pseudorange using GGTTS processing with several orbit/clock options, and c) a dual frequency carrier phase approach using Precise Point Positioning (PPP) Product from the Geodetic Survey Division of Natural Resources Canada (NRCan) that utilizes IGS precise orbits and clocks.
Published in:	Proceedings of the 14th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2001) September 11 - 14, 2001 Salt Palace Convention Center Salt Lake City, UT
Pages:	2214 - 2219
Cite this article:	Fenton, Pat, Powers, Ed, Klepczynski, Bill, Lewandowski, Wlodzimierz, Douglas, Rob, "Capabilities of the WAAS and EGNOS using High Gain Antennas for Time Distribution and Frequency Transfer," Proceedings of the 14th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2001), Salt Lake City, UT, September 2001, pp. 2214-2219.
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