Wireless Communication Device Position Estimation Accuracy
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Solution Overview
Problem
Existing position estimation technologies face accuracy issues due to obstacles and environmental factors, particularly in non-line-of-sight conditions, which degrade the accuracy of angle and distance estimation.
Innovation Solution
A communication device with multiple wireless communication sections that correlate signals to detect specific elements in correlation computation results, calculate reliability parameters, and control positional parameter determination processes to improve estimation accuracy by identifying direct waves amidst combined or delayed signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If signal correlation is performed in environments with obstacles or combined waves, then position estimation can be performed, but estimation accuracy deteriorates due to interference from delayed waves and combined signals
Solution Approach 1:
The patent segments the correlation computation results by detecting specific elements (direct waves) separately from combined or delayed waves. By identifying and isolating direct wave components through threshold-based detection of correlation peaks, the system processes only reliable signal portions, thereby maintaining position estimation accuracy in environments with obstacles or multipath interference.
Solution Approach 2:
The patent extracts direct wave components from the total received signal by detecting specific elements in the correlation computation results. The control section identifies correlation peaks that correspond to direct waves and excludes combined or delayed waves from position estimation calculations, thereby eliminating harmful interference factors while preserving accurate position estimation capability.
2Quantity of substance
If all correlation computation results are used for position estimation, then more data is available for calculation, but reliability decreases due to inclusion of inappropriate signals from obstacles
Solution Approach 1:
The patent implements a feedback mechanism where the control section evaluates correlation computation results to determine whether each detected element represents a direct wave or a combined/delayed wave. Based on this evaluation, the system selectively includes or excludes specific elements from position estimation calculations, ensuring that only reliable direct wave components are used while maintaining sufficient data quantity for accurate estimation.
Solution Approach 2:
The patent changes the parameter selection criteria by introducing threshold-based detection of correlation peaks. The control section identifies specific elements whose correlation values exceed predetermined thresholds, thereby transforming the raw correlation data into filtered, reliable components suitable for position estimation. This parameter-based filtering maintains data quantity while improving signal reliability.
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 position estimation by selectively using direct wave components, reducing errors caused by combined or delayed waves, thereby improving ranging and angle estimation precision.
Implementation Method 1
a plurality of wireless communication sections 210, each of which is configured to be capable of wirelessly transmitting and receiving a signal to and from another communication device
Implementation Method 2
correlating a first signal that is transmitted from the other communication device with respective second signals obtained when the plurality of wireless communication sections receive the first signal
Data Source
AI summary
A communication device includes: a plurality of wireless communication sections, each configured to be capable of wirelessly transmitting and receiving a signal to and from another communication device; and a control section configured to detect a specific element with regard to each of a plurality of correlation computation results that are obtained by correlating a first signal that is transmitted from the other communication device and that includes change in amplitude with respective second signals obtained when the plurality of wireless communication sections receive the first signal, calculate a reliability parameter that is an indicator indicating whether the detected specific element is appropriate for a processing target, and control a positional parameter determination process on the basis of the reliability parameter, the positional parameter determination process being a process of estimating a positional parameter indicating a position of the other communication device on the basis of the detected specific element.