Distributed Phased Array Signal Processing via Channelized Beamforming
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Solution Overview
Problem
Modern phased array communication systems face substantial signal processing requirements, especially when handling wideband signals, due to the need for efficient processing of multiple directional signals across a broad frequency spectrum, which existing systems struggle to manage effectively.
Innovation Solution
A computationally efficient phased array system with a distributed architecture that employs channelization, channelized beamforming, and beam synthesis using Inverse Fourier Transform and polyphase filters, allowing for simultaneous processing of multiple directional signals by downconverting, digitizing, channelizing, phase shifting, and synthesizing 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 processing speed and computational efficiency are improved, but system complexity and hardware requirements increase
Solution Approach 1:
The system divides the phased array into multiple distributed antenna groups, each processed by a separate local processor. Each local processor independently performs beamforming and signal processing on its assigned antenna elements, segmenting the overall processing task to achieve parallel execution and improved throughput.
Solution Approach 2:
The patent introduces a two-level processing hierarchy: local processors handle spatial beamforming in the angular domain, while a central processor manages frequency-domain channelization and synthesis. This dimensional separation of processing tasks across different computational domains resolves the complexity bottleneck.
2Adaptability or versatility
If wideband signals are processed across multiple frequencies, then frequency coverage and signal capability are improved, but processing requirements and computational load increase substantially
Solution Approach 1:
The patent introduces channelization filters as an intermediary stage between the local processors and central processing. These filters decompose wideband signals into multiple narrowband frequency channels, allowing parallel processing of different frequency components and reducing the computational burden on subsequent processing stages.
Solution Approach 2:
The system dynamically adjusts processing parameters including frequency channel assignments, beamforming weights, and sampling rates based on the specific wideband signal characteristics. This adaptive parameter adjustment optimizes processing efficiency for different frequency ranges and signal conditions.
3Productivity
If multiple beams are formed simultaneously across wide frequency ranges, then signal processing capability and system versatility are improved, but processing time and computational resources increase
Solution Approach 1:
The local processors pre-compute beamforming weights and perform initial spatial filtering on received signals before central processing. This preliminary spatial processing reduces the dimensionality of signals that require central processing, enabling faster multi-beam formation and reducing overall processing time.
Solution Approach 2:
The system maintains continuous processing across all frequency channels and antenna groups simultaneously through the distributed architecture. Multiple beams are formed in parallel across the entire frequency bandwidth without sequential processing gaps, ensuring continuous useful action and minimizing processing delays.
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.