High Degree of Freedom Array Sub-Array Preprocessing for Jamming Nulling
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Solution Overview
Problem
Current communication systems face challenges in effectively nulling out jamming signals, especially in extreme environments with varying received power and multiple interferers, as existing adaptive arrays are limited by their dynamic range and convergence rates, and require larger apertures or suboptimal preprocessing.
Innovation Solution
A high-degree-of-freedom adaptive array is designed using VS-CRPA technology and sub-array clusters with pre-processing, allowing for sharp nulling and beam steering, which enhances the dynamic range by processing dominant jamming signals at the sub-array level before combining outputs for further nulling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If typical array spacing is used, then device complexity is reduced, but the ability to null strong interferers deteriorates
Solution Approach 1:
The array is divided into multiple sub-arrays, each capable of independent preprocessing and null formation. This segmentation allows each sub-array to handle specific interferers independently, improving the overall ability to null strong jamming signals while maintaining manageable device complexity through modular architecture.
2Object-affected harmful factors
If larger aperture is used to improve nulling capability, then the ability to null strong interferers is improved, but device complexity increases
Solution Approach 1:
Preprocessing is performed at the sub-array level before signals are combined, allowing dominant jamming signals to be attenuated in advance. This preliminary action reduces the dynamic range requirements of subsequent processing stages, enabling effective nulling of strong interferers without requiring excessively large apertures or complex hardware.
Solution Approach 2:
Different sub-arrays are positioned and configured to optimize their local nulling capabilities for specific interferer directions. Each sub-array can be independently optimized for its local environment, allowing the overall system to achieve superior interferer rejection without uniformly increasing the complexity of the entire array structure.
3Device complexity
If standard preprocessing is used, then device complexity is reduced, but convergence rate deteriorates
Solution Approach 1:
Sub-array preprocessing performs initial signal processing and null formation before combining outputs, which accelerates the convergence rate by reducing the dynamic range of signals that subsequent processing stages must handle. This preliminary action allows the adaptive algorithm to converge faster on optimal weightings without significantly increasing overall device complexity.
4Adaptability or versatility
If high dynamic range processing is used, then the ability to handle differing received power is improved, but device complexity increases
Solution Approach 1:
The array is divided into multiple sub-arrays that can independently process signals with different power levels. This segmentation allows each sub-array to be optimized for specific power ranges, improving the overall dynamic range capability while maintaining manageable device complexity through modular architecture where each segment handles a portion of the total dynamic range requirement.
Data Source
AI summary
An array of elements suitable for adaptive processing in an extreme jammed environment comprised of a plurality of smaller sub-arrays of element clusters that have natural orthogonal spatial modes of excitation, wherein the improvement comprises sub-arrays with spatial orthogonality of feed modes, cross-sub-array combination to maximize pre-processing sub-array spacing and diversity of relative configuration, a high-input analog nuller used on the pre-processing sub-array therein, a high-input analog nuller is used to null a dominant jamming signal, possibly exceeding normal communication signal levels, so that the sub-array processed signals could then be fed to an antenna processor with simultaneous beam steering and null steering.