English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The results of analysis for signals propagating through the ionosphere satellite communication channels with temporal and spatial electron density irregularities in the ionosphere plasma are presented in the article. These electron density irregularities most commonly occur in low-latitude, auroral, and polar regions and refer to the random signal amplitude and phase fluctuations. Occurrence of scintillation is difficult to predict and model due to the variability of its numerous influencing factors, which include solar activities, inter-planetary magnetic field activities, local electric field and conductivity, convection processes, wave interactions. Satellite ionospheric radio waves in P-, Lfrequency bands are vulnerable to scintillations that can severely impact the acquisition and tracking process in receivers, causing a degradation in navigation and in information systems (as example, Kospas-Sarsat system) solution accuracy, integrity, and continuity. The widely-used indice to measure ionospheric scintillation activity is the scintillation index for amplitude scintillation (the standard deviation of the received signal power normalized to the average signal power). The values of scintillation index (0.27...0.49) for Cospas-Sarsat channel (406.0-406.1 MHz) are evaluated in the article. The empirical model for probability density for signal amplitude as m-law Nakagami based on these values of scintillation index is used to evaluate errorperformance degradation concerning to propagation through free space. The computer simulations for evaluation of these error-performance degradations are performed the degradation of signal/ noise is about 6.8 dB for bit-error 0.001.

THE SCINTILLATION MODELS FOR SIGNAL PROPAGATION THROUGH SATTELLITE IONOSPHERIC CHANNELS