Frequency-Diverse Array Signal Curvature for Non-LOS Positioning
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Solution Overview
Problem
Current communication technologies face challenges in establishing reliable non-line-of-sight (LOS) communication, especially with the adoption of mmWave signals, as they are prone to obstruction and require predictable reflection paths, which can be unreliable, especially in environments with heavy traffic or inclement weather.
Innovation Solution
The implementation of frequency-diverse array (FDA) technology, which allows for the transmission of signals along curved paths whose angular direction changes relative to time, enabling non-LOS communication by curving around obstructions and combining with LOS communication for enhanced mapping and positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If mmWave signals are used for communication, then communication rate is improved, but reliability deteriorates due to obstruction and unpredictable reflection paths
Solution Approach 1:
The patent applies curvature by transmitting mmWave signals along curved paths rather than straight lines. The signal trajectory is bent to绕 around obstructions such as vehicles and pedestrians, enabling non-line-of-sight communication while maintaining signal strength and reliability in dense urban environments
Solution Approach 2:
The patent introduces a new dimension to signal propagation by utilizing three-dimensional curved trajectories in addition to traditional two-dimensional planar paths. This allows signals to navigate around obstacles by changing elevation and azimuth angles dynamically, creating multiple propagation dimensions for enhanced reliability
2Device complexity
If conventional phased array signals are used, then device complexity is reduced, but positioning precision deteriorates due to inability to detect curved signal paths
Solution Approach 1:
The patent employs dynamic signal characteristics where the curved phased array signal continuously changes its propagation direction and curvature radius based on real-time environmental conditions. This dynamic adaptation allows the system to maintain simple device architecture while achieving precise positioning through the unique temporal and spatial signature of curved paths
Solution Approach 2:
The patent changes key signal parameters including frequency, phase, and curvature radius to encode position information. By modulating these parameters along the curved path, the system achieves high positioning precision without requiring complex hardware, as the parameter variations carry the necessary spatial information
Data Source
AI summary
A positioning device and positioning method in which a first wireless signal is transmitted along a first signal path having a first signal path angle that changes relative to time; second wireless signal data representing a response of a wireless station to the first wireless signal is received; a third wireless signal is transmitted along a second signal path; and an assumption that an obstruction is between the wireless communication device and the wireless station is generated if the wireless communication device receives a response from the wireless station to the first wireless signal but does not receive a response from the wireless station to the third wireless signal; wherein the second signal path is a linear path.