Ionospheric Time-Delay Algorithm for Single-Frequency GPS Users
AIR FORCE SYSTEMS COMMAND HANSCOM AFB MA GEOPHYSICS LAB
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The goal in designing an ionospheric time-delay correction algorithm for the single-frequency global positioning system user was to include the main features of the complex behavior of the ionosphere, yet require a minimum of coefficients and user computational time, while still yielding an rms correction of at least 50 percent. The algorithm designed for this purpose, and implemented in the GPS satellites, requires only eight coefficients sent as part of the satellite message, contains numerous approximations designed to reduce user computational requirements, yet preserves the essential elements required to obtain group delay values along multiple satellite viewing directions.
- Atmospheric Physics
- Navigation and Guidance