Frequency Dependent Quality of HF-Communication Channels Estimated by Superresolution Direction Finding
FGAN-FKIE WACHTBERG (GERMANY)
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While Very High Frequency VHF communication systems develop rapidly, but nonetheless high frequency HF links remain important, particularly for military communication. Their efficiency depends strongly on the ionospheric conditions, especially during the passage of ionospheric disturbances. Usually networks of ionosondes are used to control the ionospheric state. But nonetheless the occurrence of Traveling Ionospheric Disturbances TIDs has attracted much less attention in frequency management. In this study a super-resolution HF direction finding DF system has been used to estimate the quality of HF-communication channels by the variation of the direction of arrival DOA of the waves impinging onto an array antenna. As another source for signal degradation the interference of different propagation modes has been found.
- Radio Communications