Zero-Balance Phase Measurement Circuit for Accurate Angle of Arrival
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Solution Overview
Problem
Conventional radio direction-finding (RDF) equipment is bulky, complex, and impractical for portable applications, particularly in achieving accurate phase comparison measurements.
Innovation Solution
The use of a zero-balance phase measurement technique involving a two-antenna array with zero- and 90-degree electrical phase pairing, and hybrid couplers to generate phase difference signals, which are then corrected to achieve enhanced RF signal angle of arrival accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional RDF equipment is used to achieve accurate phase comparison measurements, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces conventional complex mechanical RDF equipment with an integrated circuit implementation. The phase comparison measurement function is transferred from bulky external equipment to a compact IC structure, maintaining measurement precision while dramatically reducing device complexity and size.
Solution Approach 2:
The IC structure integrates multiple functions including phase detection, signal processing, and measurement capabilities into a single device. This multi-functional integration eliminates the need for separate complex equipment components, reducing overall system complexity while preserving accurate phase comparison measurement capabilities.
2Measurement precision
If conventional RDF equipment is used to achieve accurate phase comparison measurements, then measurement precision is improved, but weight increases
Solution Approach 1:
The patent substitutes heavy conventional RDF equipment with a lightweight integrated circuit implementation. The transition from external bulky equipment to an IC-based system dramatically reduces weight while maintaining the capability for accurate phase comparison measurements, enabling portable and wearable applications.
3Measurement precision
If phase imbalance occurs in two-antenna array, then angle of arrival accuracy deteriorates, but measurement precision can be restored through correction
Solution Approach 1:
The patent implements a feedback mechanism where the second phase detector monitors phase imbalance and generates correction signals. These correction signals are fed back to adjust the first phase detector's measurements, automatically compensating for phase errors and maintaining accurate angle of arrival measurements despite phase imbalance conditions.
Solution Approach 2:
The patent introduces a correction mechanism as an intermediary between the phase detectors and the angle of arrival calculation. This intermediary processes the raw phase measurements, applies necessary corrections for phase imbalance, and outputs corrected values, thereby restoring measurement precision and reliability.
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 RF signal angle of arrival accuracy, reduces phase errors, and enables the development of compact, accurate RDF systems suitable for wearable and portable applications.
Implementation Method 1
a first hybrid coupler comprising a first input port configured to receive a first RF signal from a first receiving element, and first and second output ports, the second output port generating a 90-degree phase shift relative to the first output port
Data Source
AI summary
A zero-balance phase measurement apparatus includes first and second hybrid couplers, each of the hybrid couplers including an input port for receiving an RF signal, and first and second output ports, the second output port generating a 90-degree phase shift relative to the first output port. The first output port of the first hybrid coupler and the second output port of the second hybrid coupler are connected to first and second inputs, respectively, of a first phase detector. The first output port of the second hybrid coupler and the second output port of the first hybrid coupler are connected to first and second inputs, respectively, of a second phase detector. The apparatus is configured to generate a zero-balance phase output signal as a function of first and second phase difference signals generated by the first and second phase detectors, respectively.