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Observations of the directional characteristics of ionospherically propagated HF radio channel sounding signals over two high latitude paths

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1 Author(s)
Warrington, E.M. ; Dept. of Eng., Leicester Univ., UK

The author presents measurements of the directional characteristics of the Doppler and time delay components of a pulsed channel sounding signal received over two high latitude paths. A variation in bearing with Doppler frequency was frequently evident, an effect attributed to Doppler shifts imposed on the signal when scattered from ionospheric irregularities drifting across the reflection points. For a transauroral path, for which the ionospheric reflection points were subauroral, standard deviations of up to ~2.5° were observed in the azimuthal power distribution of the received energy. Much greater disturbances with azimuthal standard deviations of up to ~35° were recorded on signals received over a path contained entirely within the polar cap path

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Microwaves, Antennas and Propagation, IEE Proceedings  (Volume:145 ,  Issue: 5 )