Accession Number : ADP006310

Title :   Oblique-Incidence Sounder Measurements with Absolute Propagation Delay Timing,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s) : Daehler, Mark

Report Date : 03 MAY 1990

Pagination or Media Count : 9

Abstract : Timing from the Global Position Satellite (GPS) system has been applied to HF obliqueincidence sounder measurements to produce ionograms whose propagation delay time scale is absolutely calibrated. Such a calibration is useful for interpreting ionograms in terms of the electron density true-height profile for the ionosphere responsible for the propagation. Use of the time variations in the shape of the electron density profile, in conjunction with an HF propagation model, is expected to provide better near-term (1-24 hour) HF propagation forecasts than are available from current updating systems, which use only the MUF. Such a capability may provide the basis for HF frequency management techniques which are more efficient than current methods. Absolute timing and other techniques applicable to automatic extraction of the electron-density profile from an ionogram will be discussed.

Descriptors :   *IONOSPHERIC MODELS, *ATMOSPHERIC SOUNDING, HIGH FREQUENCY, GLOBAL POSITIONING SYSTEM, ELECTRON DENSITY, PROFILES, IONOGRAMS.

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE