Phased Array Beam Synthesis for Overlapping Subbands
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Solution Overview
Problem
Modern phased array communication systems face substantial signal processing requirements, especially with wideband signals, due to the need to simultaneously process and beamform multiple directional signals across a wide frequency spectrum, which existing systems struggle to handle efficiently, particularly when signals occupy irregularly spaced or overlapping subbands.
Innovation Solution
A computationally efficient phased array system with a distributed architecture that uses channelization, channelized beamforming, and beam synthesis, employing multiple antenna elements with digital signal processors and a central processor for parallelized signal processing, including downconversion, digitization, channelization, phase shifting, and beam synthesis using Inverse Fourier Transform and polyphase filters, to form and synthesize beams across a broadband frequency spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If distributed signal processing architecture with multiple local processors is used, then computational efficiency and processing speed are improved, but device complexity increases
Solution Approach 1:
The patent divides the signal processing system into multiple antenna elements, each with its own local processor performing channelization and beamforming operations independently. This segmentation allows parallel processing of wideband signals across multiple frequency channels, achieving computational efficiency while distributing the complexity across modular units rather than concentrating it in a single centralized processor
Solution Approach 2:
The patent introduces a distributed spatial dimension by deploying multiple antenna elements across different physical locations. Each antenna element processes signals independently in parallel, transforming the processing architecture from a single-dimension centralized approach to a multi-dimension distributed approach, thereby improving processing throughput without proportionally increasing overall system complexity
2Adaptability or versatility
If channelization and beam synthesis are performed for multiple signals with arbitrary bandwidths, then adaptability and coverage are improved, but signal processing complexity increases
Solution Approach 1:
The patent implements a universal channelization framework where each antenna element's local processor can handle multiple signals with arbitrary bandwidths and center frequencies using the same polyphase filter bank structure. This multi-functional capability allows the system to adapt to different signal configurations without requiring separate processing paths, thereby improving versatility while controlling complexity through reuse of common processing blocks
Solution Approach 2:
The patent enables dynamic adjustment of processing parameters such as channel bandwidth, center frequency, and beamforming weights to accommodate different signal configurations. By allowing these parameters to be changed based on the specific signal requirements, the system achieves high adaptability for handling diverse signals while maintaining a standardized processing architecture that prevents complexity from escalating
Data Source
AI summary
In a phased-array communications system with a distributed processing architecture, channelized beamforming is used to minimize sampling and computational requirements, as well as reduce the data rates required for the communication of data and control information between system components. A central processor within the phased array system performs parallelized synthesis of channelized beams to form beams composite beams in sub-bands that overlap multiple channels. The phased array system incorporates a flexible scheme for channelization, channelized beamforming, and synthesis so that any number of composite beams may be synthesized in parallel at any one time. The system is capable of simultaneously processing beams that occupy overlapping subbands, and does not require restriction on the bandwidths or center frequencies of the subbands which the beams occupy.