RSSI Position Estimation Using Altitude Correction
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Solution Overview
Problem
Position estimation methods using RSSI values face challenges with increased distance errors, leading to inaccurate position specification and locus plotting, especially when the distance between the receiver and transmitter increases, and often require three proper measurement values which may not be feasible.
Innovation Solution
A position estimation method that acquires and processes RSSI values from multiple receivers to calculate distances, applying correction processing when a distance is below a threshold, allowing for more accurate position estimation by adjusting the position of the receiver with the shortest distance as the transmitter's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If RSSI values are used for position estimation, then power consumption and cost are reduced compared to GPS, but measurement precision deteriorates as distance between receiver and transmitter increases
Solution Approach 1:
The patent transitions from 2D position estimation (latitude and longitude) to 3D position estimation by incorporating altitude information. The receiver acquires altitude data either from barometric pressure sensors or from satellite positioning systems, and uses this vertical dimension to improve overall position estimation accuracy. This additional spatial dimension compensates for the reduced precision in horizontal position estimation that occurs at greater distances from transmitters.
2Measurement precision
If three measurement values are required for position estimation, then estimation accuracy improves, but reliability decreases when proper measurement values cannot be obtained
Solution Approach 1:
The patent changes the parameter requirements for position estimation from needing three horizontal measurement values (from three different transmitters) to needing only two horizontal measurement values plus one vertical measurement value (altitude). This parameter substitution allows the system to achieve position estimation even when three proper horizontal RSSI measurements are not available, thereby improving reliability while maintaining estimation accuracy through the incorporation of altitude information.
3Measurement precision
If distance errors increase with greater distance, then position specification becomes difficult, but using more receivers to compensate increases device complexity
Solution Approach 1:
The patent enables the receiver to perform self-service position estimation by utilizing its own altitude measurement capabilities (through barometric pressure sensors or satellite positioning) in combination with RSSI data from just two transmitters. This self-provided vertical dimension information compensates for distance errors in horizontal positioning, eliminating the need to deploy additional receivers and thereby reducing device complexity while maintaining position estimation accuracy.
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 enhances the accuracy of position estimation by reducing errors and ensuring reliable position calculation even when traditional methods fail due to distance limitations.
Implementation Method 1
a transmitter (for example, a 'beacon') that transmits a radio wave and moves together with a search target, and plural receivers (for example, 'concentrators') each of which receives a radio wave transmitted from the transmitter
Implementation Method 2
estimates the distance to the search target from the RSSI value of the received radio wave (the received signal strengths)
Data Source
AI summary
A position estimation method includes: acquiring, from plural receivers that receive a plural received signal strengths of radio waves transmitted from a transmitter and transmit the plural received signal strengths, the plural received signal strengths; and in a case in which a plural distances between the transmitter and the plural receivers are calculated based on the plural received signal strengths, and a position of the transmitter is estimated by using the plural distances, and in a case in which a distance among the plural distances is smaller than a predetermined threshold, performing a first correction processing by estimating a position of a receiver corresponding to the distance smaller than the threshold as a position of the transmitter.