Title:
SURFACE TIDAL-CURRENT ESTIMATION DEVICE, SURFACE TIDAL-CURRENT ESTIMATION METHOD, AND SURFACE TIDAL-CURRENT ESTIMATION PROGRAM
Document Type and Number:
WIPO Patent Application WO/2020/003855
Kind Code:
A1
Abstract:
[Problem] To estimate a surface tidal current using a simple configuration. [Solution] In the present invention, a surface tidal-current estimation unit 10 comprises echo data acquisition units 21, 22, a predicted echo generation unit 30, an actual echo generation unit 40, and an estimation unit 50. Echo data acquisition unit 21 acquires, from echo data for waves at a plurality of times, echo data for a plurality of times in a first period PRD1. Echo data acquisition unit 22 acquires, from echo data for waves at a plurality of times, echo data for a plurality of times in a second period PRD2 that includes times following the times in the first period PRD1 by a prediction time Δt. The predicted echo generation unit 30 uses the echo data for the plurality of times in the first period PRD1, the prediction time Δt, and a wave dispersion relation to generate a predicted echo ECtt. The actual echo generation unit 40 uses the echo data for the plurality of times in the second period PRD2 to generate an actual echo ECt. The estimation unit 50 uses a result of comparing the predicted echo ECtt and actual echo ECt to estimate a surface tidal current.
Inventors:
NAKAJIMA RYO (JP)
KAWANAMI SATOSHI (JP)
KAWANAMI SATOSHI (JP)
Application Number:
PCT/JP2019/021015
Publication Date:
January 02, 2020
Filing Date:
May 28, 2019
Export Citation:
Assignee:
FURUNO ELECTRIC CO (JP)
International Classes:
G01S13/95
Foreign References:
| US20170315225A1 | 2017-11-02 |
Other References:
YOUNG, I.R. ET AL.: "A Three-Dimensional Analysis of Marine Radar Images for the Determination of Ocean Wave Directionality and Surface Currents", JOURNAL OF GEOPHYS I CAL RESEARCH, vol. 90, no. C1, 20 January 1985 (1985-01-20), pages 1049 - 1059, XP009155015, DOI: 10.1029/JC090iC01p01049
HEIA, K. ET AL.: "A Minimum Variance Unbiased Estimator for Ocean Surface Currents Based on Multifrequency Microwave Radar Observations", IEEE JOURNAL OF OCEANIC ENGINEERING, vol. 23, no. 3, July 1998 (1998-07-01), pages 223, 234, XP011042434
HEIA, K. ET AL.: "A Minimum Variance Unbiased Estimator for Ocean Surface Currents Based on Multifrequency Microwave Radar Observations", IEEE JOURNAL OF OCEANIC ENGINEERING, vol. 23, no. 3, July 1998 (1998-07-01), pages 223, 234, XP011042434
Download PDF: