Wireless Tag Reader Direction Estimation for Reliable Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless tag communication devices face challenges in efficiently detecting target wireless tags due to directional antenna directivity, which can result in missing the tag being searched, especially when the transmission output power is high and the antenna's directivity is low in a specific direction.
Innovation Solution
A wireless tag communication device equipped with a directional antenna and a calculation section that estimates the direction range for communicating with the wireless tag based on transmission output power and reading distance, displaying this range to the user to facilitate efficient searching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If transmission output power is increased to expand reading range, then reading distance is improved, but directional antenna directivity causes tags in low-gain directions to be missed
Solution Approach 1:
The patent applies dynamics by making the transmission output power variable rather than fixed. The power is dynamically adjusted based on the detected direction of the target tag, using higher power when the tag is in a low-directivity direction and lower power when in a high-directivity direction, thereby maintaining reliable detection across all directions while optimizing energy usage
Solution Approach 2:
The patent changes the transmission output power parameter according to the spatial direction of the target tag. By calculating the antenna directivity pattern and determining the gain in the tag's direction, the system adjusts the power parameter to compensate for directional variations, ensuring consistent detection reliability regardless of tag position
2Area of stationary object
If transmission output power is large to read neighboring tags, then coverage area is improved, but user may miss the target tag by moving forward in read direction
Solution Approach 1:
The patent implements feedback by detecting the direction of the target tag and using this information to adjust the transmission output power. The direction detection result feeds back to the power control mechanism, creating a closed-loop system that adapts the reading parameters to the actual spatial distribution of tags, preventing the user from missing the target tag
Solution Approach 2:
The patent performs preliminary direction detection and power calculation before executing the tag reading operation. By预先 determining the appropriate transmission power based on the target tag's direction, the system prepares the optimal reading conditions in advance, ensuring accurate target tag identification from the outset
3Power
If directional antenna is used to improve communication directionality, then signal strength in specific direction is improved, but readable direction range varies and reduces operational flexibility
Solution Approach 1:
The patent compensates for the directional limitations of the antenna by dynamically changing the transmission output power parameter. When the target tag is detected in a direction with lower antenna gain, the power is increased to maintain sufficient signal strength, thereby extending the effective readable direction range while preserving the benefits of directional antenna signal strength
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 the user to recognize the estimated direction and range of the target wireless tag, reducing the likelihood of missing the tag and allowing for efficient searching in a short period by adjusting the device's direction accordingly.
Implementation Method 1
a wireless tag communication device that communicates with a wireless tag through a directional antenna
Data Source
AI summary
A wireless tag communication device for communicating with a wireless tag through a directional antenna includes a wireless tag communication section configured to communicate with the wireless tag, a calculation section configured to estimate a direction range for communicating with the wireless tag based on transmission output power of the wireless tag communication device and an estimated reading distance to the wireless tag, and a display section configured to display the estimated direction range.