Indoor Positioning Antenna Array Polarization Switching
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Solution Overview
Problem
Indoor positioning technologies, particularly those using the angle of arrival (AoA) algorithm, face accuracy and stability issues due to interference from multipath and co-channel effects, which hinder precise coordinate calculation in interference-heavy environments.
Innovation Solution
An electronic device comprising an indoor positioner with an array antenna and a positioning engine server that divides antenna units into groups, switches polarization directions, calculates and filters angles of arrival, and uses statistical methods to delete outliers, thereby increasing the accuracy of signal angle calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the angle of arrival algorithm is used for indoor positioning, then positioning accuracy can be improved, but the system becomes more susceptible to multipath and co-channel interference
Solution Approach 1:
The patent divides the array antenna into multiple antenna unit groups (first direction, second direction, third direction, and fourth direction antenna unit groups) based on the relative positional relationships of antenna units. Each group processes signals independently to calculate angles of arrival, allowing the system to segment the interference impact and select reliable measurements from multiple groups, thereby maintaining positioning accuracy despite multipath and co-channel interference.
Solution Approach 2:
The patent switches the polarization directions of the antenna unit groups at each time point, changing the signal reception parameters dynamically. This parameter change allows the system to receive wireless signals from different polarization directions, increasing the number of available angles of arrival and enabling statistical filtering to eliminate interference-affected measurements, thus improving positioning accuracy in interference-heavy environments.
2Measurement precision
If multiple antenna unit groups are used to receive wireless signals, then the number of angles of arrival increases, but the system complexity increases
Solution Approach 1:
The patent segments the array antenna into multiple antenna unit groups based on spatial relationships, with each group dedicated to receiving signals from specific directions. This segmentation allows parallel processing of signals from different directions, increasing the number of angles of arrival while maintaining manageable complexity through structured organization of antenna units into distinct directional groups.
Solution Approach 2:
The patent designs the antenna unit groups to serve multiple functions: each group can receive wireless signals from different polarization directions when polarization switching is applied, and all groups contribute to the same positioning calculation. This multi-functionality allows the system to maximize the utility of each antenna group, increasing measurement accuracy without proportionally increasing overall system complexity.
3Measurement precision
If polarization directions of antenna unit groups are switched at each time point, then the number of angles of arrival increases, but the signal processing time increases
Solution Approach 1:
The patent applies periodic action by switching the polarization directions of antenna unit groups at each time point in a systematic manner. This periodic switching pattern allows the system to collect multiple angles of arrival from different polarization states, increasing measurement accuracy while the regular timing pattern enables efficient processing and reduces overall time loss through predictable signal acquisition cycles.
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 and stability of indoor positioning by filtering out interference effects and selecting the most reliable angles of arrival, leading to improved coordinate determination.
Implementation Method 1
an array antenna that includes a plurality of antenna units... receives a wireless signal from user equipment
Implementation Method 2
switches the polarization directions of the antenna unit groups at each time point, so that the antenna unit groups receive the wireless signal from the user equipment at different polarization directions
Data Source
AI summary
An electronic device includes an indoor positioner and a positioning engine server. The indoor positioner has an antenna array including a plurality of antenna units. The indoor positioner divides the antenna units into multiple antenna unit groups, receives a wireless signal from user equipment at each time point via the antenna unit groups, and calculates a plurality of angles of arrival (AOA) corresponding to the antenna unit groups at each time point. The positioning engine server receives and stores the angles of arrival corresponding to the antenna unit groups at each time point, and filters the angles of arrival according to the angle sizes of the angles of arrival corresponding to the antenna unit groups at each time point stored in an observation period.