DEVICE FOR MEASURING SPEED OF MOVING BODY

Title:

DEVICE FOR MEASURING SPEED OF MOVING BODY

Document Type and Number:

WIPO Patent Application WO/1991/014953

Kind Code:

A1

Abstract:

A device for measuring the speed of a moving body such as a ship, a mass of water or the like. The device comprises a means (11, 12, 26, 28) for measuring the ground speed of the ship; a first device for measuring the speed of the moving body which measures the phase difference between a reference signal and an echo signal caused by a transmitted ultrasonic signal and includes a Doppler shift frequency (26), performs a predetermined Fourier-transform of the obtained phase difference data, calculates a log speed of the ship from the obtained Fourier spectrum (28), and calculates a tide speed from the obtained ground speed and the obtained log speed of the ship (28); a second device for measuring the speed of the moving body which measures a period every pulse included in the received echo signal (26), calculates the log speed of the ship from the inverse number of the period and the Doppler shift frequency (28), and calculates the tide at the depth at which the echo signal is generated from the ground speed and the log speed of the ship (28); and a selecting means (10) for selecting either of the first and second devices to operate the selected one.

Inventors:

IINO HIROSHI (JP)
AOYAMA SHIGERU (JP)
ISHIHARA SHINJI (JP)

Application Number:

PCT/JP1991/000384

Publication Date:

October 03, 1991

Filing Date:

March 26, 1991

Export Citation:

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Assignee:

FURUNO ELECTRIC CO (JP)

International Classes:

G01S15/02; G01S15/60; G01S15/87; (IPC1-7): G01S15/58

Foreign References:

JPS5018397B1	1975-06-28
JPS6282381A	1987-04-15
JPS62294988A	1987-12-22
JPS63118666A	1988-05-23

Other References: