The study of meteoric echoes is greatly facilitated by the use of a twin-channel Doppler presentation, by means of which both the amplitude and phase of the returned signal may be determined independently. Such a “double-Doppler” system has direct application to the verification of the mechanism of meteor-whistle formation, to the determination of the motion of ionization trails drifting under the influence of upper air winds, and to spectrum analysis of those echoes which exhibit amplitude fading. Examples of the application of the double-Doppler technique to these problems are presented.
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Manning et al. (1952) studied this question.
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