Circularly Polarized Antenna for Passive Wireless Localization
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Solution Overview
Problem
Current wireless localization technologies face challenges in accuracy due to the need for time synchronization among base stations and the requirement for devices to send and receive signals, which increases localization time and costs, especially when localizing multiple devices, and are affected by antenna polarization patterns.
Innovation Solution
An antenna structure producing a circularly polarized radiation pattern and a wireless localization method that allows devices to be localized to only receive signals, using a specific antenna design with first and second radiation units, conductive wires, and a power splitting unit, and a method involving packet exchange for clock correction and time-difference-of-arrival calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional SDS-TWR requires packet transmission between the to-be-localized device and the base stations, then ranging can be achieved without time synchronization, but it requires longer time to localize multiple devices
Solution Approach 1:
The patent extracts the signal transmission function from the to-be-localized device, leaving only the base stations to transmit signals. The to-be-localized device becomes a passive receiver, eliminating the need for it to send packets and reducing localization time for multiple devices.
Solution Approach 2:
The patent introduces a reference base station as an intermediary that transmits reference signals to other base stations. This mediator enables clock correction and time synchronization among base stations without requiring the to-be-localized device to participate in bidirectional packet exchange.
2Device complexity
If linearly-polarized antennae are used in the devices to be localized and the base stations, then the structure is simple, but the antennae cannot receive signals properly when the polarization direction is perpendicular, decreasing localization accuracy
Solution Approach 1:
The patent changes the polarization parameter of the antenna from linear to circular. This parameter change allows the antenna to receive signals regardless of the orientation of the transmitting antenna, eliminating the polarization mismatch problem and improving localization accuracy.
3Ease of manufacture
If TOA and TDOA localization techniques are used, then equipment costs and testing costs are reduced, but accurate time synchronization among base stations is highly demanded
Solution Approach 1:
The patent implements a feedback mechanism where base stations transmit reference signals and measure the time of arrival at other base stations. This feedback loop enables automatic clock correction and time synchronization among base stations, reducing the complexity of the time synchronization system while maintaining low equipment costs.
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
The solution reduces the time and cost of wireless localization by eliminating the need for devices to send signals and improves accuracy by using circularly polarized antennas, enabling efficient localization of multiple devices simultaneously.
Implementation Method 1
an antenna structure and an antenna device having radiators that produce circularly polarized radiation pattern
Data Source
AI summary
The present invention provides an antenna structure, an antenna device and a wireless localization method. The antenna structure includes a first radiation unit including a plurality of first connecting portions and a plurality of first annular radiation portions, a second radiation unit including a plurality of second connecting portions and a plurality of second annular radiation portions, a first conductive wire and a plurality of second conductive wires. A first end of each first annular radiation portion is connected to the first connecting portion, and the second end thereof extends towards the first end of the adjacent first annular radiation portion. A first end of each second annular radiation portion is connected to the second connecting portion, and the second end thereof extends towards the first end of the adjacent second annular radiation portion.