A microwave FM‐CW radar can obtain the complete spectrum of radial velocities of both precipitation particles and refractive‐index fluctuations in the optically clear air. Heretofore the extraction of the Doppler spectrum from this type of radar was believed to be a formidable, if not impossible, task. We have implemented a Doppler processing technique that uses a data acquisition system developed for pulsed Doppler radar. We present Doppler spectra obtained with a zenith‐pointing FM‐CW radar that demonstrate this new capability. In addition to the strong refractive‐index layers observed by the FM‐CW radar in the optically clear air, there is evidence that scattering from a background continuum of C n ² can be detected when a Doppler operating mode is employed.
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Strauch et al. (1976) studied this question.
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