PDoA Crosstalk Correction for UWB Angle of Arrival
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Solution Overview
Problem
Crosstalk interference distorts the phase difference of arrival (PDoA) of electromagnetic waves at receive antennas, affecting the accuracy of angle of arrival (AoA) determination in positioning systems, such as ultra-wideband (UWB) systems, which is crucial for determining the position of a transmitter.
Innovation Solution
A system that includes two receive antennas with a phase detector, phase extractor, PDoA measurer, PDoA corrector, combiner, and AoA generator, which measures the PDoA, corrects it for crosstalk using stored crosstalk factors, and calculates the AoA by accounting for the antenna separation and wavelength, thereby improving the accuracy of AoA determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If crosstalk correction is applied to improve PDoA measurement accuracy, then measurement precision improves, but device complexity increases due to additional correction circuitry and processing
Solution Approach 1:
The patent pre-calculates and stores crosstalk correction values in lookup tables before actual PDoA measurement. The correction factors are determined offline based on antenna characteristics and stored for rapid retrieval during operation, eliminating the need for complex real-time correction calculations and reducing circuit complexity.
Solution Approach 2:
The patent introduces lookup tables as an intermediary structure that stores pre-computed crosstalk correction values. This intermediary allows the system to access correction factors through simple table lookups rather than complex real-time calculations, bridging the gap between measurement accuracy requirements and computational simplicity.
2Measurement precision
If multiple receive antennas are used to determine AoA, then positioning accuracy improves, but crosstalk interference increases between antennas
Solution Approach 1:
The patent converts the harmful crosstalk effect into a useful correction factor. By characterizing the crosstalk between antennas and pre-calculating correction values, the system transforms the interference into a known quantity that can be compensated for, actually improving measurement accuracy despite the presence of multiple antennas.
Solution Approach 2:
The patent performs preliminary characterization of crosstalk effects between antennas during the design and calibration phase. Correction factors are determined in advance and stored for use during operation, allowing the system to operate multiple antennas simultaneously while compensating for their mutual interference through pre-computed corrections.
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 correction of PDoA for crosstalk significantly enhances the accuracy of AoA determination, reducing errors and improving the precision of determining the transmitter's position, as demonstrated by simulations showing reduced differences between corrected and ideal PDoA values.
Implementation Method 1
A phase difference of arrival (PDoA) of the electromagnetic wave at two receive antennas is indicative of the AoA. The PDoA takes into account the fact that the electromagnetic wave arriving at one receive antenna is phase-shifted with respect to arrival at another receive antenna due to physical separation of the two receive antennas.
Implementation Method 2
crosstalk takes the form of interference between the receive antennas and/or between connections such as printed circuit board (PCB) traces from the receive antennas to a receiver
Data Source
AI summary
An angle of arrival (AoA) of an electromagnetic wave is determined. A phase of an antenna signal associated with each of two receive antenna is measured. A measured phase difference of arrival (PDoA) of the electromagnetic wave is determined based on the measured phase of each of the antenna signals. The measured PDoA is corrected based on one or more crosstalk factors associated with the two receive antennas. The AoA of the electromagnetic wave at the two receive antenna is generated based on the corrected measured PDoA.