Beacon Position Model for Smooth Vehicle Navigation
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Solution Overview
Problem
Conventional movable body control systems using beacon transmitters for navigation face challenges in determining vehicle position accurately, especially with varying radio wave reception sensitivity among vehicles and interference from obstacles, leading to steep speed changes and discomfort in travel.
Innovation Solution
A system that generates a common model for position determination using time-series measurement values of beacon radio wave reception intensities, incorporating three-dimensional shape features and obstacle detection, to control travel smoothly and consistently across different vehicles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a model is created for each vehicle based on individual beacon reception sensitivity, then position determination accuracy is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent creates a common beacon reception model that can be universally applied across different vehicles. Instead of creating individualized models for each vehicle, the system uses a single standardized model that works for all vehicles, thereby reducing device complexity while maintaining position determination accuracy through standardized measurement protocols
Solution Approach 2:
The patent introduces a conversion parameter that translates beacon reception intensity values to position information in a standardized manner. By changing the parameter representation and using a common conversion table, the system achieves consistent position determination across different vehicles without requiring vehicle-specific models
2Measurement precision
If position determination is performed only when beacon reception intensity exceeds a threshold, then position accuracy is improved, but speed changes become steep and comfortableness decreases
Solution Approach 1:
The patent performs position determination continuously at all times, not just when threshold conditions are met. By preliminarily establishing position information continuously and updating it based on beacon reception intensity changes, the system avoids sudden position corrections that would cause steep speed changes and improve travel comfortableness
Solution Approach 2:
The patent uses continuous feedback from beacon reception intensity to adjust position determination and speed control. The system monitors reception intensity changes and uses this feedback to smoothly adjust vehicle speed and position, preventing abrupt changes that would reduce comfortableness while maintaining accurate position determination
3Productivity
If radio wave reflection from obstacles is not considered, then position determination speed is improved, but position accuracy deteriorates due to interference
Solution Approach 1:
The patent converts the harmful effect of radio wave reflection into a beneficial feature by using it as an additional positioning reference. Instead of treating reflected radio waves as noise to be filtered out, the system utilizes them to enhance position determination accuracy while maintaining determination speed through efficient signal processing
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
Enables accurate and smooth navigation by using a common model for position determination, reducing steep speed changes and improving comfort by accounting for radio wave interference and obstacles, allowing for autonomous control of movable bodies like vehicles and wheelchairs.
Implementation Method 1
a plurality of beacon transmitters 106 are disposed around a traveling road 104 on which a movable body 102 travels, the movable body 102 receives beacon radio waves from the plurality of beacon transmitters 106
Implementation Method 2
generating a model for determining a position of the movable body based on beacon radio wave reception intensities of the beacon radio waves from the plurality of beacon transmitters 106
Data Source
AI summary
A movable body control system includes a movable body including a beacon receiver for receiving beacon radio waves from a plurality of beacon transmitters installed around a traveling road, and at least one processing equipment configured to generate a model for determining a position of the movable body based on a distribution of time-series measurement values of beacon radio wave reception intensities in the beacon receiver and to control travel of the movable body while determining an area in which the movable body travels at present based on a distribution of time-series measurement values of the beacon radio wave reception intensities at present and the model.