UWB Direction Finding Using Dynamic AoA and AoD Selection
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Solution Overview
Problem
Existing ultra-wide band (UWB) technologies struggle to accurately determine the direction between UWB devices, which is essential for providing location-based services, especially with the introduction of High-rate pulse repetition frequency (HRP) UWB technology.
Innovation Solution
A method that involves transmitting signals through multiple antennas by a transmitting device and receiving these signals through multiple antennas by a receiving device, allowing for the selection of either the Angle of Departure (AoD) method or the Angle of Arrival (AoA) method based on the device statuses, and measuring the direction using the selected method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If direction finding is performed using only AoA method, then the receiving device can measure direction, but the transmitting device cannot determine direction and direction correction is needed when device orientation changes
Solution Approach 1:
The patent combines AoA (Angle of Arrival) and AoD (Angle of Departure) methods into a unified direction finding system. The receiving device measures AoA using its multiple antennas, while the transmitting device measures AoD using its multiple antennas. By merging these two measurement approaches, the system achieves complete directional information without needing direction correction when device orientations change, as each device independently determines its own directional relationship.
Solution Approach 2:
The patent implements a dynamic direction finding system where both transmitting and receiving devices actively participate in direction measurement. Instead of a static one-way measurement, the system dynamically adapts to changing device orientations by having both devices measure and share their respective AoA and AoD values, allowing continuous accurate direction determination regardless of orientation changes.
2Measurement precision
If direction finding is performed using only AoD method, then the transmitting device can measure direction, but the receiving device cannot determine direction and direction correction is needed when device orientation changes
Solution Approach 1:
The patent merges AoD (Angle of Departure) measurements from the transmitting device with AoA (Angle of Arrival) measurements from the receiving device. This combination ensures that both devices can determine direction independently, eliminating the need for direction correction when orientations change. The merged approach provides redundant directional information that adapts to various device orientations.
Solution Approach 2:
The system dynamically utilizes both AoD and AoA measurements based on device orientations. When device orientations change, the system continues to function accurately by maintaining the dual-measurement approach, where each device's dynamic orientation is compensated by the other device's measurement data.
3Measurement precision
If HRP UWB technology is introduced to improve distance measurement precision, then distance measurement accuracy improves, but direction finding capability is lost
Solution Approach 1:
The patent merges HRP UWB distance measurement technology with traditional direction finding methods. By combining the precise distance measurement capability of HRP UWB with multi-antenna AoA/AoD direction measurement, the system recovers direction finding capability while maintaining the improved distance measurement accuracy provided by HRP UWB technology.
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
This approach enables accurate direction measurement between UWB devices, expanding the range of measurable directions and eliminating the need for direction correction due to changes in device orientation, thereby enhancing the precision and reliability of location-based services.
Implementation Method 1
measuring the direction between the devices by using a selected method, wherein the AoD method is a method of measuring an AoD of signals transmitted through two or more different antennas from the transmitting device based on a phase difference between the transmitted signals, and the AoA method is a method of measuring an AoA of signals received through two or more different antennas by the receiving device based on a phase difference between the received signals
Data Source
AI summary
A method of measuring a direction between devices performing ultra-wide band (UWB) communication and each including a plurality of antennas includes transmitting signals through a plurality of antennas by a transmitting device and receiving the signals through a plurality of antennas by a receiving device, and selecting at least one of an angle of departure (AoD) method and an angle of arrival (AoA) method depending on statuses of the transmitting device and the receiving device and measuring the direction between the devices by using a selected method.