Pulse Sounding with Closely Spaced Receivers as a Tool for Measuring Atmospheric Motions and Fine Structure in The Ionosphere. Iii. The Application of the Generalized Correlation and Cross Spectral Analysis to the Model of Turbulent Drift

摘要

The fading of reflected pulses received at three closely-spaced antennas can be analyzed with a correlation method. If the records contain rf phase fluctuations as well as amplitude fluctuations, a generalized correlation analysis is appropriate as well as a generalized cross spectral analysis. If it can be assumed that the fading is caused by turbulent drift at the reflection level, the analysis will result in certain relationships which are characteristic for the model. For example, the phase change of the cross-power spectrum will be proportional to frequency. The report contains Part III as a continuation of Parts I and II previously presented by Pfister and Bibl (1968). In this report, the formulas for handling amplitude and phase data with the generalized correlation and spectral analysis are given. Samples of measured auto-correlation and power spectra are presented, and a method for reducing the data in terms of a turbulent spectrum is indicated. (Author)