Optical Sensor Threshold Adjustment for Accurate ID Detection
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Solution Overview
Problem
In optical/RF wireless hybrid communication, the terminal device experiences erroneous detection of optical ID information due to varying light illuminance levels based on its position and light receiving angle, leading to inaccurate data extraction.
Innovation Solution
A terminal device with an optical sensor and a calculation unit that samples and dynamically adjusts the threshold value for binarizing optical signals based on changing illuminance levels, using methods like moving average, weighted average, or exponential moving average, to ensure accurate ID information acquisition regardless of position and angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed threshold value is used for binarizing optical signals, then the device complexity is reduced, but the measurement precision deteriorates due to erroneous detection at different positions and angles
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed threshold value to a dynamically adjustable threshold mechanism. The terminal device periodically updates the threshold value based on detected light illuminance levels, allowing the threshold to adapt to changing environmental conditions and terminal device positions. This dynamic adjustment resolves the contradiction by maintaining measurement precision across varying conditions without significantly increasing device complexity.
Solution Approach 2:
The patent implements parameter changes by modifying the threshold value parameter based on detected light illuminance. The terminal device measures the current light illuminance, compares it with a reference value, and adjusts the threshold parameter accordingly. This parameter adaptation enables accurate optical ID detection regardless of the terminal device's position or orientation, resolving the precision issue while keeping the overall system relatively simple.
2Power
If the terminal device moves closer to the base station, then the signal strength increases, but the binarization accuracy deteriorates because both high and low levels exceed the fixed threshold
Solution Approach 1:
The patent resolves this contradiction by changing the threshold parameter based on the detected signal strength. When the terminal device moves closer to the base station and receives stronger optical signals, the system increases the threshold value proportionally. This parameter adjustment ensures that the binarization process remains accurate regardless of signal strength variations, allowing the device to correctly distinguish between high and low signal levels at any distance from the base station.
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
This approach allows for accurate acquisition of optical ID information, reducing erroneous detection and enhancing communication reliability across different positions and angles.
Implementation Method 1
an optical sensor that receives an optical signal of the optical wireless communication from the base station
Data Source
AI summary
An object is to provide a terminal device, a communication method, and a communication system which are capable of acquiring accurate optical ID information regardless of the position of the terminal device and the light receiving angle.The terminal device, the communication method, and the communication system according to the present invention each sets a threshold value for the illuminance of a received optical signal by using a moving average method, a weighted moving average method, or an exponential moving average, so that the optical signal can be binarized with a threshold value according to a change in the position of the terminal device, the light receiving angle, or the like. Information from other sensors may be used to set the threshold value.