DOPPLER MEASURING INSTRUMENT AND TIDAL CURRENT METER

PROBLEM TO BE SOLVED: To provide a Doppler measuring instrument having excellent noise-resistant performance and capable of measuring precisely a Doppler shift amount. SOLUTION: Each gravity center calculation section Wt[1:n] is a section including a peak of a power spectrum Pt[fi], and a gravity ce...

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Bibliographische Detailangaben
Hauptverfasser: OKIMOTO KAZUYA, MUSHIAKI MASAHIKO, KAWANAMI TOSHIYUKI
Format: Patent
Sprache:eng
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Zusammenfassung:PROBLEM TO BE SOLVED: To provide a Doppler measuring instrument having excellent noise-resistant performance and capable of measuring precisely a Doppler shift amount. SOLUTION: Each gravity center calculation section Wt[1:n] is a section including a peak of a power spectrum Pt[fi], and a gravity center frequency fwt[1:n] is calculated in every of the sections Wt[1:n]. A tentative Doppler shift amount is a frequency shift amount when an output in mutual correlation processing of the power spectra Pt[fi], Pr[fi] gets maximum. A gravity center calculation section Wr[1:n] correlated with the gravity center calculation section Wt[1:n] is determined based on the tentative Doppler shift amount, and a gravity center frequency fwr[1:n] of the power spectrum Pr[fi] is calculated in the every sections Wr[1:n]. Compensation of frequency dependency of a Doppler shift or the like is executed for a difference between the gravity center frequencies fwr[1:n], fwt[1:n] to find the Doppler shift amount fd. A frequency range of the gravity center calculation section Wr[1:n] is corrected by the Doppler shift amount fd, and the Doppler shift amount fd is found repeatedly until converged. COPYRIGHT: (C)2008,JPO&INPIT