Location Estimation Using Fourth Signal Strength Correction
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Solution Overview
Problem
Existing location estimation systems using the three-point positioning method face challenges in accurately estimating the location of a transmitter due to environmental factors and signal strength variations among receivers.
Innovation Solution
A location estimation apparatus and method that acquires and processes received signal strengths from multiple receivers, using the first to third highest signal strengths for initial estimation and correcting the location based on the signal strength of the fourth highest receiver when the difference is within a predetermined value, to improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the three-point positioning method is used to estimate transmitter location based on signal strength from three receivers, then the location can be calculated, but the accuracy is reduced due to environmental factors and signal variations
Solution Approach 1:
The system performs preliminary sorting of received signal strengths to identify the top three strongest signals for initial location estimation, then uses the fourth strongest signal for correction. This preliminary organization of data enables systematic handling of signal variations and environmental factors before the actual location calculation.
Solution Approach 2:
The system uses the fourth highest received signal strength as feedback to correct the initially estimated location. By comparing the difference between the fourth highest signal strength and the threshold, the system adjusts the location estimate to compensate for environmental factors and signal variations that affected the initial three-point positioning.
2Measurement precision
If only the top three received signal strengths are used for location estimation, then the calculation is simpler, but the accuracy is insufficient due to environmental errors
Solution Approach 1:
Instead of using exactly three signal strengths for positioning, the system uses the top three for initial estimation and incorporates the fourth strongest signal for correction. This partial extension beyond the minimum required three signals provides additional information to improve accuracy while maintaining relatively simple calculation procedures.
3Measurement precision
If additional receivers are used to improve location accuracy, then measurement precision increases, but the system complexity and computational load increase
Solution Approach 1:
The system segments the use of receiver data into two distinct phases: first using the top three strongest signals for initial location estimation, then using the fourth signal separately for correction. This segmentation allows the system to leverage multiple receivers for improved accuracy while maintaining a structured, manageable processing approach that doesn't linearly increase complexity with each additional receiver.
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
Enhances the accuracy of location estimation by incorporating additional signal strength data, reducing errors caused by environmental factors and signal variations, resulting in a more precise determination of the transmitter's location.
Implementation Method 1
a received signal strength of a radio signal sent out from a transmitter
Data Source
AI summary
A location information server including: an acquisition unit configured to acquire, from each of a plurality of receivers, a received signal strength of a radio signal transmitted from a transmitter; an estimation unit configured to estimate a location of the transmitter based on the received signal strengths of the first to the third highest among the acquired received signal strengths; and a correction unit configured to correct, when the difference between a received signal strength based on at least one of the received signal strengths of the first to the third highest and a received signal strength of the fourth highest is smaller than a predetermined value, the estimated location of the transmitter based on the received signal strength of the fourth highest.