UWB Angle of Arrival Determination via Early Phase Difference
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Solution Overview
Problem
Existing methods for determining the angle of arrival (AoA) and direction of arrival (DoA) of electromagnetic waves from a mobile device to a UWB receiver are inaccurate due to signal distortion caused by nearby metal surfaces, particularly in vehicle access systems.
Innovation Solution
The method involves calculating the phase difference of arrival at an earlier location in the signal response prior to the midpoint of the first signal path, where the signal exceeds a specific threshold value, thereby reducing the influence of reflection paths and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the phase difference of arrival is determined at the midpoint of the first signal path, then the calculation is simple, but the accuracy of angle of arrival determination deteriorates due to signal distortion from reflection paths
Solution Approach 1:
The patent applies preliminary action by determining the phase difference of arrival at an earlier location in the signal response before the midpoint of the first signal path. This early determination prevents contamination from reflection paths that arrive later, while still providing sufficient signal strength for accurate measurement. The method proactively selects an optimized location that balances signal purity and measurement accuracy before the problematic reflection components arrive.
2Adaptability or versatility
If the receiver is installed near metal surfaces, then the device can be integrated into vehicle access systems, but signal distortion occurs due to reflection paths that are only marginally longer than the direct path
Solution Approach 1:
The patent determines the phase difference of arrival at an optimized location in the signal response that precedes the arrival of reflection paths. This preliminary determination captures the direct signal path before metal surface reflections contaminate the measurement, thereby maintaining reliable angle of arrival determination even when the receiver is installed near vehicle body metal surfaces.
3Loss of time
If the UWB pulses have a limited pulse width of approximately 2 ns, then the signal provides temporal resolution, but signal components from reflection paths overlap with and distort the direct path signal
Solution Approach 1:
The patent determines the phase difference of arrival at an earlier location in the signal response before reflection path components arrive and overlap with the direct path signal. This preliminary determination exploits the temporal resolution provided by the limited pulse width to capture the direct signal path before contamination occurs, thereby maintaining accurate phase difference measurement despite the finite pulse duration.
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 enhances the accuracy of AoA and DoA determination, improves access functions for vehicles, increases customer convenience, and boosts confidence in access systems by minimizing signal distortion from nearby metal surfaces.
Implementation Method 1
determining an angle of arrival and/or a direction of arrival of an electromagnetic wave from a mobile device to a receiving unit
Implementation Method 2
The angle of arrival may be calculated from a phase difference of arrival (or PDoA for short) at the two receiving antennas
Implementation Method 3
The proximity of the metal results in signal paths that are only marginally longer than the first signal path or the direct line of sight
Data Source
AI summary
A method for determining an angle of arrival and/or a direction of arrival of an electromagnetic wave from a mobile device to a receiving unit, in particular a UWB receiver. The receiving unit includes at least two receiving antennas, For determining the angle of arrival and/or the direction of arrival, a phase difference of arrival between signal responses at the receiving antennas is ascertained. The phase difference of arrival is ascertained at such a location in the signal responses that is still situated in the signal responses prior to a particular midpoint of a first signal path.