Direction Finding System Using Summed Phase Shifts
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Solution Overview
Problem
Existing direction-finding systems using phase or amplitude interferometry lack precision and are subject to ambiguities, and high-resolution processing methods require excessive computing resources and memory, making them unsuitable for systems with limited footprint or low power consumption.
Innovation Solution
A system utilizing at least three antennas to determine phase shifts between different pairs, summing these shifts to artificially modify antenna spacing, and calculating the direction of arrival based on parameter differences, allowing for higher accuracy and reduced computational requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If phase or amplitude interferometry systems are used to determine direction of arrival, then the system structure is simple, but the measurement precision is insufficient and ambiguities occur
Solution Approach 1:
The patent combines multiple antenna pairs into a unified processing system where phase shifts from different pairs are summed and processed together. This merging approach allows the system to achieve high-resolution direction finding by integrating information from multiple baseline configurations, resolving the ambiguity problem of simple interferometry while maintaining reasonable system complexity.
Solution Approach 2:
The patent transitions from traditional two-dimensional phase comparison to a three-dimensional processing space by summing phase shifts from multiple antenna pairs with different spacings. This dimensional expansion in the signal processing domain enables unambiguous direction of arrival estimation while avoiding the need for physically larger antenna arrays.
2Measurement precision
If high resolution processing or beam forming methods are implemented, then the measurement precision improves, but the computing resources and memory space requirements increase significantly
Solution Approach 1:
The patent extracts only the essential phase shift information from each antenna pair and sums these extracted values directly, rather than performing full beam forming or high-resolution spectral analysis. This extraction approach maintains measurement precision by focusing on the critical phase differences while dramatically reducing computational complexity and memory requirements.
Solution Approach 2:
The patent uses a computationally efficient algorithm that processes phase shifts through simple summation and comparison operations, replacing resource-intensive beam forming calculations. This approach achieves sufficient precision with minimal computational resources, making it suitable for embedded or low-power applications.
3Adaptability or versatility
If antenna spacing is increased to counteract modulation frequency constraints, then the bandwidth adaptability improves, but the system size increases
Solution Approach 1:
The patent makes the antenna system universally adaptable to different signal frequencies by using multiple antenna pairs with different spacings. The processing system can selectively sum phase shifts from appropriate pairs based on the incoming signal frequency, enabling the same physical array to effectively operate across a wide bandwidth without requiring physical reconfiguration or increasing overall system size.
Solution Approach 2:
The patent introduces dynamic selection of antenna pair combinations based on signal frequency characteristics. The system adaptively chooses which phase shifts to sum and how to weight them, allowing the effective baseline spacing to be dynamically adjusted to match the modulation frequency of the received signal, thereby maintaining bandwidth adaptability within a compact physical footprint.
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
Enables accurate direction-finding with lower computational needs than high-resolution methods and improved precision over interferometry systems, while adapting to various signal frequencies by modifying antenna pair selections.
Implementation Method 1
the calculation of the phase shift of the same signal received from two different antennas
Implementation Method 2
phase or amplitude interferometry systems
Data Source
Figure 1
Figure 2~3
AI summary
The system has a first determination device (302) determining phase shifts associated with antennas (301-A-301-C), where the phase shifts are difference between phases of signal of the antennas. A summation device (303) is configured to sum the phase shifts. A second determination device (304) determines parameters respectively associated with an inbound direction from the summation by difference between the summation and a reference summation. A third determination device (305) determines the direction as arrival direction presumedly associated with the parameter having minimal value. An independent claim is also included for a method for determining inbound direction of electric radio signal.