Wideband Array Beamforming with Multi-Frequency Null Steering
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Solution Overview
Problem
Current wideband arrays are unable to place lobes or nulls at multiple independent frequencies in space, and they have not combined both frequency and space interference cancellation and pointing for unique interference cancellation over the entire wideband in one array.
Innovation Solution
The disclosure describes a wideband array that uses wideband beamforming with interference cancellation at multiple independent frequencies and spatial locations, enabling the positioning of nulls in space at selected frequencies to combine both frequency and space interference cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If wideband beamforming is implemented, then frequency coverage is improved, but the ability to place lobes or nulls at multiple independent frequencies in space deteriorates
Solution Approach 1:
The wideband signal is decomposed into multiple narrowband frequency bins using DFT, allowing independent beamforming control at each frequency bin. This segmentation enables the system to place lobes and nulls at multiple independent frequencies while maintaining wideband operation, resolving the contradiction between wideband coverage and frequency-specific spatial control
Solution Approach 2:
The patent extends beamforming from single-frequency spatial control to multi-frequency spatio-frequency control by adding the frequency dimension. Each frequency bin can independently steer main lobes and place nulls at different spatial locations, creating a multi-dimensional control space that simultaneously achieves wideband coverage and independent frequency-specific null placement
2Object-affected harmful factors
If interference cancellation at multiple frequencies is implemented, then interference rejection is improved, but device complexity deteriorates
Solution Approach 1:
The interference cancellation function is segmented across multiple frequency bins, with each bin handling interference at its specific frequency range. This distributed approach achieves comprehensive wideband interference rejection without requiring a single complex interference cancellation system, thereby managing device complexity while improving interference rejection
Solution Approach 2:
The same beamforming array structure performs multiple functions: it simultaneously steers main lobes for signal enhancement and places nulls for interference cancellation across multiple frequency bins. This multi-functionality achieves comprehensive interference rejection without proportionally increasing device complexity, as the existing array elements serve multiple purposes
Data Source
AI summary
This disclosure describes a wide band array that uses wideband beamforming with main lobe steering and interference cancellation at multiple independent frequencies and spatial locations embodiment includes acoustic sensors configured to sense and time-sample acoustic signals into buffers, Discrete Fourier Transforms (DFT) decompose the acoustic signals into frequency bins, narrowband beamformers that process the decomposed signals and generate steerable main lobes and at least one null region steerable in spatial locations the signal output from each of the beamformers are processed through an Inverse Discrete Fourier Transform (IDFT) to produce the full wideband spectrum output signal.