Rapid frequency analysis of fading radio signals
James M. Watts, K. T. R. Davies · Journal of Geophysical Research Atmospheres · 1960
Examples of frequency analysis of fading radio signals for long periods of time are demonstrated, and the method of obtaining them is explained. They include both regular HF propagation and VHF ionospheric forward-scatter samples. The procedure is also useful for the analysis of other natural phenomena having long time scales and slow variations.