A tutorial on frequency adaptive communication systems in the HF bands
Year: 2022 Language: english Author: ITU Genre: Handbook ISBN: 978-92-61-37191-3 Format: PDF Quality: eBook Pages count: 26 Description: Because of the unique characteristics of HF communications and the increasing requirement for stable and reliable communication, HF adaptive systems evolved. HF adaptive systems first appeared in the 1980s. Over years of technical development, standards have been proposed and updated by organizations, practical systems have been researched and applied, and the ITU-R continually revised and updated Recommendations concerning HF adaptive systems. Of note, the United States of America developed the automatic link establishment (ALE) standard version FED-STD-1045A. As the most influential standard, it became the worldwide de facto standard for digitally initiating and sustaining HF radio communications. With the progression of these standards, various HF adaptive systems also progressed and came to have the same general functions. These general functions are described in Recommendation ITU-R F.1110-3: “Basically, an adaptive system has three functions: – automatic selection of the frequency and other system parameters to be used; – automatic operation for calling, establishing the communication (with possible switchover to the peripheral equipment needed for the type of service to be provided), and disconnecting; – adaptivity during the communication in order to optimize the quality of service according to the ionospheric conditions and spectrum congestion at all times.”
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A tutorial on frequency adaptive communication systems in the HF bands
Language: english
Author: ITU
Genre: Handbook
ISBN: 978-92-61-37191-3
Format: PDF
Quality: eBook
Pages count: 26
Description: Because of the unique characteristics of HF communications and the increasing requirement for stable and reliable communication, HF adaptive systems evolved. HF adaptive systems first appeared in the 1980s.
Over years of technical development, standards have been proposed and updated by organizations, practical systems have been researched and applied, and the ITU-R continually revised and updated Recommendations concerning HF adaptive systems. Of note, the United States of America developed the automatic link establishment (ALE) standard version FED-STD-1045A. As the most influential standard, it became the worldwide de facto standard for digitally initiating and sustaining HF radio communications.
With the progression of these standards, various HF adaptive systems also progressed and came to have the same general functions. These general functions are described in Recommendation ITU-R F.1110-3: “Basically, an adaptive system has three functions:
– automatic selection of the frequency and other system parameters to be used;
– automatic operation for calling, establishing the communication (with possible switchover to the peripheral equipment needed for the type of service to be provided), and disconnecting;
– adaptivity during the communication in order to optimize the quality of service according to the ionospheric conditions and spectrum congestion at all times.”
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