L1C Signal Design Options
January 2006
John W. Betz, The MITRE Corporation
Charles R. Cahn, Independent Consultant
Philip A. Dafesh, The Aerospace Corporation
Christopher J. Hegarty, The MITRE Corporation
Kenneth W. Hudnut, United States Geological Survey
Capt Amanda J. Jones, United States Air Force, GPS NAVSTAR Joint Program
Office
Richard Keegan, Independent Consultant
Karl Kovach, ARINC Engineering Services
Lt Lawrence S. Lenahan, United States Air Force, GPS NAVSTAR Joint Program
Office
Howard H. Ma, The MITRE Corporation
Joseph J. Rushanan, The MITRE Corporation
Thomas A. Stansell, Stansell Consulting
Charles C. Wang, The Aerospace Corporation
Soon K. Yi, ARINC Engineering Services
ABSTRACT
Design activities for a new civil signal centered at 1575.42 MHz,
called L1C, began in 2003, and the Phase 1 effort was completed in 2004.
The L1C signal design has evolved and matured during a Phase 2 design
activity that began in 2005. Phase 2 has built on the initial design
activity, guided by responses to international user surveys conducted
during Phase 1. A common core of signal characteristics has been developed
to provide advances in robustness and performance. The Phase 2 activity
produced five design options, all drawing upon the core signal characteristics,
while representing different blends of characteristics and capabilities.
A second round of international user surveys was completed to solicit
advice concerning these design options. This paper provides an update
of the L1C design process, and describes the current L1C design options.
Initial performance estimates are presented for each design option,
displaying trades between signal tracking robustness, the speed and
robustness of clock and ephemeris data, and the rate and robustness
of other data message contents. Planned remaining activities are summarized,
leading to optimization of the L1C design.
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