Location Estimation Using RSSI Reliability Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing location estimation systems face challenges in accurately estimating the location of transmitters or receivers due to environmental errors, as they rely on the three-point positioning method using received signal strength indicators (RSSI).
Innovation Solution
A location estimation apparatus and method that acquire received signal strengths of radio signals, estimate the location of the transmitter or receiver using the top three received signal strengths, and calculate the reliability of the location estimation. The apparatus re-estimates the location based on the reliability and the location estimation results from other subjects, using the received signal strengths between them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the three-point positioning method is used to estimate location based on received signal strengths, then the location estimation can be performed with simple equipment and basic processing, but the location estimation accuracy deteriorates due to environmental errors between transmitters and receivers
Solution Approach 1:
The patent applies feedback by using the location estimation results of one subject to correct the location estimation of another subject. The reliability calculation unit calculates reliability based on received signal strengths, and the estimation unit re-estimates locations using both the original signal strengths and the reliability information from other subjects, creating a feedback loop that improves accuracy progressively
Solution Approach 2:
The patent merges the location estimation results of multiple subjects together. Instead of estimating locations independently, the system combines the estimation results from multiple transmitters and receivers, using the reliability calculated from signal strengths to integrate these results into a more accurate final location estimation
2Productivity
If location estimation is performed using only the top three received signal strengths, then the processing speed is maintained at acceptable levels, but the location estimation accuracy deteriorates due to environmental factors affecting signal strength measurements
Solution Approach 1:
The system uses feedback by calculating reliability based on the top three received signal strengths and then using this reliability information to re-estimate locations. This feedback mechanism allows the system to maintain processing speed while improving accuracy through iterative refinement
Solution Approach 2:
The patent changes the parameter used for location estimation from raw signal strength values to reliability-based corrected values. By transforming the estimation process to use reliability information derived from signal strengths, the system maintains computational efficiency while achieving higher precision
Data Source
AI summary
A location information server includes: an acquisition unit configured to acquire received signal strengths of radio signals transmitted from a transmitter and received at a receiver; an estimation unit configured to estimate a location of the transmitter or receiver, using at least the top three received signal strengths among the acquired received signal strengths; and a reliability calculation unit configured to calculate a reliability of the location estimation based on the received signal strengths that have been used.