Accession Number:

ADA018862

Title:

A First-Order, Worldwide, Ionospheric, Time-Delay Algorithm

Descriptive Note:

Air Force surveys in geophysics

Corporate Author:

AIR FORCE CAMBRIDGE RESEARCH LABS HANSCOM AFB MA

Personal Author(s):

Report Date:

1975-09-01

Pagination or Media Count:

26.0

Abstract:

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.

Subject Categories:

  • Direction Finding
  • Radiofrequency Wave Propagation
  • Unmanned Spacecraft

Distribution Statement:

APPROVED FOR PUBLIC RELEASE