In order to simplify the data processing system of the rocket-VLF Doppler experiments, two processes were improved: One is concerned with the real time data aquisition process at KSC, that is, for recording of Doppler beat signals the FM data recorder so far used is substituted by an usual tape recorder. The other is concerned with the analysis of a frequency spectrum of the Doppler beat signal, namely the Fast Fourier Transform (FFT) program of an electronic computer is used to analyse the frequency spectrum, from which the Doppler shift is deduced through a pattern recognition technique and finally the electron density profile can be automatically obtained by the computer.
VLFドップラー実験のデータ処理
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