Abstract
The paper describes spectral measurements on a 20 GHz shallow-angle bistatic scatter link using antennas directed off-axis in the vertical plane. This configuration retains the property of a line-of-sight microwave link of that the Doppler and vibration spectra being separated. Theoretical Doppler and vibration spectra are presented. In some cases the observed Doppler spectra agree with theory, and show qualitatively the expected shifts associated with drop size distribution variations. Other interesting spectra show unexpectedly high Doppler frequencies, suggesting that downdraughts are being observed. In some cases a high frequency tail on the spectra is regarded as a possible, though not conclusive, detection of the vibration component.
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