A First-Order, Worldwide, Ionospheric, Time-Delay Algorithm
Air Force surveys in geophysics
AIR FORCE CAMBRIDGE RESEARCH LABS HANSCOM AFB MA
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A first-order model algorithm designed to reduce ionospheric time- delay errors by approximately 50 rms on a world-wide basis for single frequency users of the Global Positioning SystemNAVSTAR is described. The algorithm was designed for greatest accuracy during times of day when ionospheric time-delay errors are expected to be largest. The algorithm is available in several options from one which requires only a monthly mean solar-flux value to one which requires 9 daily or monthly update coefficients. Several approximations also are made in the geometry calculations to further reduce operational user computer storage and running time requirements.
- Direction Finding
- Radiofrequency Wave Propagation
- Unmanned Spacecraft