Antenna Array Direction Finding via MMSE Weight Optimization
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Solution Overview
Problem
Traditional methods for determining the direction of arrival of signals in antenna arrays require specific element spacing, limiting their accuracy and applicability.
Innovation Solution
The use of minimum mean squared error (MMSE) processing techniques to find optimal weights for antenna array elements, allowing for accurate direction finding with conventional element placement and enabling a well-defined null in the signal direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional interferometry techniques are used for direction finding, then the method is well-established, but the accuracy is limited and specific element spacing is required
Solution Approach 1:
The patent changes the fundamental parameter of direction finding from phase difference measurement (interferometry) to amplitude nulling (minimum mean squared error). This parameter change allows the system to work with conventional antenna element placements without requiring specific spacing, while achieving higher direction finding accuracy through the creation of a well-defined null in the signal direction
Solution Approach 2:
The patent replaces the mechanical/physical constraint of fixed element spacing required by interferometry with a signal processing approach (MMSE weighting). This substitution allows conventional antenna placements to be used while achieving superior direction finding performance through adaptive weight optimization
2Measurement precision
If MMSE processing is used to find optimal weights, then direction finding accuracy is improved, but computational complexity increases
Solution Approach 1:
The MMSE processing system is self-adjusting and adaptive. The optimal weights are determined automatically by the system based on the received signals, minimizing the mean squared error between the composite output and reference element output. This self-service approach achieves high direction finding accuracy without requiring manual calibration or complex external control systems
Solution Approach 2:
The MMSE process uses feedback from the error signal (difference between composite output and reference element) to iteratively optimize the weights. This feedback mechanism allows the system to adapt to changing signal conditions and achieve optimal direction finding performance dynamically
Data Source
AI summary
Systems and methods are provided for determining a direction of a signal received at an antenna array. An antenna array includes a plurality of antenna elements, including a reference element. A signal combiner element is configured to combine weighted signals from a subset of the plurality of antenna elements to provide a composite output. An adaptive processing component is configured to determine an optimal set of weights for the subset of the plurality of antenna elements. An angle of arrival search component is configured to find a direction of minimum gain given the optimal set of weights.