RSSI Correction Using Azimuth Detection for Positioning Accuracy

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Solution Overview

Problem

Current positioning systems, such as GPS, are costly and prone to errors due to weather interference and building shielding, while RSSI-based technologies face direction-dependent signal strength issues leading to position detection errors.

Innovation Solution

An electronic device and tracking system that incorporates an azimuth detection unit, wireless communication unit, and processing unit to adjust and correct RSSI values based on current and previous azimuth measurements, using stored pattern strength indicators to prevent misjudgment in position or distance calculation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If GPS positioning system is used, then positioning function is provided, but cost is high and positioning accuracy is affected by weather or building shielding

Engineering Contradiction:

Improvepositioning functionVSAvoidcost

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces expensive GPS hardware with a low-cost RSSI-based positioning solution using inexpensive wireless communication modules and azimuth detection units that can be integrated into ordinary electronic devices

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The patent substitutes the mechanical/GPS satellite-based positioning system with an electronic signal-based system using wireless communication signals and azimuth detection to determine position

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Device complexity

If RSSI-based positioning technology is used, then cost is reduced, but position detection accuracy deteriorates due to direction-dependent signal strength

Engineering Contradiction:

ImprovecostVSAvoidposition detection accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent implements feedback by detecting the azimuth of the electronic device and using this information to adjust the RSSI value through an adjustment value obtained from pattern strength indicators corresponding to different azimuths

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent changes the parameter being measured from raw RSSI to corrected RSSI by applying an adjustment value that compensates for directional signal strength variations, thereby improving position detection accuracy

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11269080B2Tracking method, electronic device using the same, and tracking system using the same

Publication Date: 2022.03.08 CHICONY ELECTRONICS CO LTD

AI summary

A tracking method, an electronic device using the same, and a tracking system using the same are provided. The electronic device includes a wireless communication unit, an azimuth detection unit, a storage unit, and a processing unit. The wireless communication unit detects an external wireless communication signal to generate a current RSSI. The azimuth detection unit detects a current azimuth of the electronic device. The storage unit stores pattern strength indicators and a previous azimuth. The processing unit obtains an RSSI adjustment value according to the current azimuth, the previous azimuth, and the pattern strength indicators, and the processing unit further obtains an RSSI corrected value according to the RSSI adjustment value and the current RSSI.