AOA Positioning Using Reduced Attenuation RF
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Solution Overview
Problem
Conventional RF-based identification and location-finding systems face inaccuracies in indoor and outdoor environments due to multipath phenomena, limited by self-interference, multipath, and non-line-of-sight propagation, especially at VHF and lower frequencies, where narrow bandwidth ranging signals struggle to differentiate between direct and reflected signals effectively.
Innovation Solution
A method and system employing a narrow bandwidth ranging signal with multi-path mitigation processor using digital signal processing and software-defined radio technologies, capable of operating on VHF, UHF, and higher frequencies, to improve location accuracy by mitigating multipath effects through advanced signal processing techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If narrow bandwidth ranging signals are used at VHF and lower frequencies, then signal attenuation is reduced and propagation range is improved, but the system cannot effectively differentiate between direct and reflected signals due to multipath phenomena
Solution Approach 1:
The patent segments the received signal into multiple components by analyzing different arrival times and paths. The signal processing system separates direct signals from reflected signals based on their temporal and spatial characteristics, allowing accurate differentiation even with narrow bandwidth signals at VHF frequencies.
Solution Approach 2:
The system performs preliminary signal processing and analysis before final position calculation. By pre-processing the received signals to identify and characterize multipath components, the system prepares the data in advance for accurate position determination, resolving the differentiation problem before it affects measurement precision.
2Adaptability or versatility
If conventional RF-based location-finding systems are used in indoor environments, then coverage is achieved, but position accuracy is limited by self-interference, multipath, and non-line-of-sight propagation
Solution Approach 1:
The patent converts the harmful multipath effects into beneficial information by analyzing the reflected signal characteristics. Instead of treating reflections as noise to be eliminated, the system uses them to infer environmental features and improve position accuracy through sophisticated signal processing that exploits the temporal and spatial patterns of multipath components.
Solution Approach 2:
The system changes multiple parameters including operating frequency, signal bandwidth, and processing algorithms to optimize performance for indoor environments. By adjusting these parameters and using adaptive signal processing, the system maintains position accuracy despite the challenging conditions of self-interference and non-line-of-sight propagation.
3Measurement precision
If wide bandwidth ranging signals are used to mitigate multipath effects, then location accuracy is improved, but signal attenuation increases and propagation range is reduced
Solution Approach 1:
The patent optimizes the bandwidth parameter to achieve a balance between multipath mitigation and signal attenuation. By carefully selecting and adjusting the bandwidth parameter along with other signal characteristics, the system achieves sufficient location accuracy without the excessive signal loss that would result from using wide bandwidth signals at VHF frequencies.
Data Source
AI summary
Systems and methods for determining user equipment (UE) locations within a wireless network using reference signals of the wireless network are described. The disclosed systems and methods utilize a plurality of in-phase and quadrature (I/Q) samples generated from signals provided by receive channels associated with two or more antennas of the wireless system. Based on received reference signal parameters the reference signal within the signals from each receive channel among the receive channels is identified. Based on the identified reference signal from each receive channel, an angle of arrival between a baseline of the two or more antennas and incident energy from the UE to the two or more antennas is determined. That angle of arrival is then used to calculate the location of the UE. The angle of arrival may be a horizontal angle of arrival and/or a vertical angle of arrival.