Accession Number:

ADA229968

Title:

Ionospheric Time-Delay Algorithm for Single-Frequency GPS Users

Descriptive Note:

Corporate Author:

AIR FORCE SYSTEMS COMMAND HANSCOM AFB MA GEOPHYSICS LAB

Personal Author(s):

Report Date:

1987-05-01

Pagination or Media Count:

9.0

Abstract:

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.

Subject Categories:

  • Atmospheric Physics
  • Navigation and Guidance

Distribution Statement:

APPROVED FOR PUBLIC RELEASE