Waveform Estimation Device Using Dual Tracking Filters

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Solution Overview

Problem

Conventional waveform estimation devices struggle to accurately predict tidal components due to variations caused by currents, leading to delayed predictions and incorrect detection of tsunami components.

Innovation Solution

A waveform estimation device employing two tracking filters with different drive noises to predict regular waveform components, allowing for correct identification and selection of regular and irregular components, and determining residuals to detect irregular waveform components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If Fourier transformation-based filtering processing is used to predict tidal components, then tidal components can be extracted even without tide gauge stations, but the prediction delays from actual measurement data and cannot correctly predict tidal components due to variations caused by currents

Engineering Contradiction:

Improveability to extract tidal components without tide gauge stationsVSAvoidprediction accuracy of tidal components

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent divides the signal processing into two distinct segments: Fourier transformation-based filtering to extract tidal components, and a separate correlation-based processing to detect tsunami components. This segmentation allows each method to operate optimally without interfering with the other, resolving the contradiction between versatility and precision.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a reference waveform as an intermediary element that represents typical tsunami patterns. This reference waveform serves as a mediator between the measured water level changes and the tsunami detection algorithm, enabling accurate tsunami component extraction even when tidal predictions are delayed or imprecise.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Device complexity

If a single tracking filter is used to predict regular waveform components, then the device complexity is reduced, but the irregular waveform components cannot be correctly detected due to variations in period and amplitude

Engineering Contradiction:

Improvenumber of tracking filtersVSAvoiddetection accuracy of irregular waveform components

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent employs multiple tracking filters with different parameters (such as different prediction periods and amplitude characteristics) to dynamically adapt to varying waveform conditions. This dynamic approach allows the system to correctly identify irregular waveform components despite changes in period and amplitude, resolving the contradiction between device complexity and detection accuracy.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS9857460B2Waveform estimation device and waveform estimation method

Publication Date: 2018.01.02 MITSUBISHI ELECTRIC CORP

AI summary

A waveform estimation device includes: tracking filter processing units 11 and 12 that execute tracking filter processing on observation values using tracking filters having different drive noises; and a filter output selection unit 14 that selects a regular waveform component predicted by the tracking filter processing unit 11, in an irregular section, and selects a regular waveform component predicted by the tracking filter processing unit 12, in a regular section. A residual processing unit 16 calculates a residual between observation values extracted by an observation value extraction unit 1, and a regular waveform component selected by the filter output selection unit 14. An irregular waveform detection unit 17 determines whether the residual is an irregular waveform component.