Characteristics of fading of HF signal and noise intensities on three paths between the United Kingdom and Turkey

Abstract

Results from a recent measurement campaign in Turkey, pertinent to reliability and compatibility determination in HF service planning, are presented. Within‐an‐hour signal fading was found to be slightly more severe than, but day‐to‐day variability only half as large as the values (in decibels) adopted by the 1984 World Administrative Radio Conference on HF Broadcasting, or WARC‐HFBC(84). Within‐an‐hour variability of noise was negligible, and day‐to‐day variations of noise were only about one quarter of the amplitude (in decibels) given by CCIR report 322‐3 [International Radio Consultative Committee (CCIR), 1988a]. The day‐to‐day spatial correlation coefficients of both signal and noise at sites separated in range by about 400 km were found to be about 0.4. Correlation of signal with noise at each site was negligible.

Overview of a Graduate Course Delivered in Turkey, Emphasizing Solar-Terrestrial Physics and Space Weather

“…5. An high frequency (HF) fading experiment was conducted between the U.K. and Turkey (e.g., Gibson et al (1995)). 6.…”

An Antarctica‐to‐Spain HF ionospheric radio link: Sounding results

“…Most of them concentrate on a specific latitude where single-hop links are preferred in order to describe the propagation conditions (e.g. Wagner et al [1995] and Angling et al [1998] for the high latitudes, Gibson et al [1995] and Warrington and Stocker [2003] for midlatitudes, Fitzgerald et al [1999] and Rao et al [2002] for low latitudes). These studies frequently involve a number of measurements, such as amplitude, signal-to-noise ratio (SNR), fading and delay and Doppler spread.…”