Worker Activity Recording Device Using Inertial Navigation and Beacon Correction
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Solution Overview
Problem
Existing methods for recording and analyzing worker activity in production sites require significant labor and have high calculation loads due to the need for detailed and accurate data acquisition, making it difficult to improve productivity efficiently.
Innovation Solution
An activity recording device that includes a work specifying unit, position specifying unit, state specifying unit, and communication module, which uses position estimation and correction based on movement speed, direction history, and beacon radio wave strength to accurately record worker positions with a small calculation load, enabling efficient data transmission and analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If positioning technology using radio waves of beacons is used to automatically acquire worker position data, then the labor required for observation is reduced, but the calculation load becomes great due to the need to individually prepare pre-established data for map data
Solution Approach 1:
The patent creates a simplified virtual map that copies only the essential structural elements of the physical space (walls, obstacles, pathways) without requiring complete detailed mapping. This virtual representation enables position estimation using simple geometric calculations rather than complex radio wave triangulation, reducing computation load while maintaining automation
Solution Approach 2:
The patent changes the approach from using radio wave strength measurements (which require complex calibration and pre-established data) to using movement speed and direction parameters combined with virtual map geometry. This parameter substitution reduces calculation complexity while preserving automatic position tracking capability
2Measurement precision
If detailed and accurate worker activity data is recorded to improve productivity analysis, then the accuracy of productivity evaluation is improved, but the calculation load and cost for data acquisition and analysis increase
Solution Approach 1:
The patent extracts only the essential elements needed for productivity analysis (position, work type, state) from complete worker activity monitoring. By focusing on key parameters rather than recording all possible activity details, the system maintains measurement precision for productivity evaluation while reducing calculation load and data processing requirements
Solution Approach 2:
The patent performs preliminary classification of work types and states based on position and movement patterns before detailed analysis. This pre-processing organizes data into meaningful categories upfront, reducing the computational burden of subsequent productivity analysis while preserving accuracy for evaluation purposes
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device allows for accurate and efficient specification of worker positions with reduced calculation load, improving data accuracy and enabling repeated analysis cycles for productivity improvement.
Implementation Method 1
a position estimation unit for estimating the position of the worker from a movement speed of the worker and a history of a direction of the worker
Implementation Method 2
a reception strength at which the activity recording device receives radio waves transmitted from a plurality of beacons
Data Source
AI summary
An activity recording device includes: a work specifying unit for specifying a work of a worker; a position specifying unit for specifying a position of the worker from a position coordinate of the worker; a state specifying unit for specifying a state of the work of the worker from the position specified by the position specifying unit; and a recording unit for recording, as activity data, the work, the position, and the state in association with an activity time, wherein the position specifying unit includes a position estimation unit and a position correction unit.