Phase Correction Device for Acceleration Sensor Error Compensation

Solution Overview

Problem

Existing acceleration sensor systems face challenges in accurately identifying animal actions due to mounting errors and phase displacement, which require manual calibration and result in inefficiencies in calculating thresholds and machine learning parameters.

Innovation Solution

A phase correction device that calculates standard deviation and representative values of acceleration data to estimate and correct phase errors, enabling automatic correction of mounting errors and phase displacement using statistical processing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If manual calibration is performed to correct mounting errors and phase displacement, then measurement precision is improved, but device complexity and time consumption increase

Engineering Contradiction:

Improveaction identification accuracyVSAvoidcalibration procedure complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The system automatically performs phase correction and action identification without requiring manual calibration operations. The microcontroller autonomously calculates phase differences, applies corrections to acceleration data, and identifies animal actions, eliminating the need for user intervention in the calibration process.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system performs phase correction calculations and establishes calibration parameters in advance during an initial measurement period. These pre-calculated correction values are then applied to subsequent measurements, avoiding repeated manual calibration operations while maintaining high measurement precision.

Inventive Principle:

Principle #10Preliminary action

2Measurement precision

If manual calibration is performed to correct mounting errors, then measurement precision is improved, but loss of time increases

Engineering Contradiction:

Improveacceleration data accuracyVSAvoidparameter calculation time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The system performs phase correction calculations and establishes calibration parameters in advance during an initial measurement period. These pre-calculated correction values are then applied to subsequent measurements, avoiding repeated manual calibration operations while maintaining high measurement precision.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system replaces manual mechanical calibration operations with automated computational methods. The microcontroller automatically calculates phase differences, applies corrections to acceleration data, and identifies animal actions through algorithmic processing, eliminating the need for time-consuming manual calibration procedures.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Productivity

If phase correction is performed automatically using statistical processing, then productivity is improved, but measurement precision may deteriorate

Engineering Contradiction:

Improveaction identification efficiencyVSAvoidphase correction accuracy

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The system replaces manual mechanical calibration operations with automated computational methods. The microcontroller automatically calculates phase differences, applies corrections to acceleration data, and identifies animal actions through algorithmic processing, eliminating the need for time-consuming manual calibration procedures.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The system uses statistical processing of acceleration data to calculate phase differences and correction values, then applies these corrections and validates the results through continued measurement and analysis. This feedback loop ensures that automated corrections maintain measurement precision while improving processing efficiency.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS10139428B2Phase correction device, action identification device, action identification system, microcontroller, phase correction method, and program

Publication Date: 2018.11.27 RENESAS ELECTRONICS CORP

AI summary

There are included a standard deviation calculation unit that receives a plurality of acceleration data and calculates a standard deviation of the plurality of acceleration data for each specified time period, an average calculation unit that receives the plurality of acceleration data and calculates an average value of the acceleration data for each specified time period, a phase estimation unit that estimates a phase of the average value in a space having a first coordinate axis and a second coordinate axis by using the average value when the standard deviation is smaller than a specified threshold, and a phase correction unit that performs phase correction of the average value by using the estimated phase.