Broadband RF Aperture Array Imaging With Short Receiver Links
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Solution Overview
Problem
Existing technologies face challenges in acquiring high-resolution broadband RF images of physical environments due to the need for wide instantaneous bandwidth, large total bandwidth, and the ability to record RF signals with fine spatial and temporal granularity.
Innovation Solution
A broadband RF imaging device comprising a broadband RF aperture array with at least four array elements and a bandwidth of at least 700 MHz, connected to at least one RF receiver with RF connections of 10 meters or less, and a computer for digitizing and reconstructing RF images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the bandwidth of the RF aperture array is increased to achieve high-resolution broadband RF imaging, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The RF aperture array is divided into multiple discrete array elements (at least four elements), where each element independently captures RF signals. This segmentation allows the system to achieve broadband imaging capability by combining signals from multiple elements while maintaining manageable complexity for each individual element.
Solution Approach 2:
The patent transitions from traditional narrowband RF imaging to broadband RF imaging by adding the frequency dimension (bandwidth of at least 700 MHz) to the spatial dimension. This dimensional expansion enables high-resolution imaging across both space and frequency domains simultaneously.
2Measurement precision
If the RF connection length is reduced to improve signal quality and reduce interference, then the measurement precision is improved, but the ease of operation decreases
Solution Approach 1:
The RF connection length is constrained to 10 meters or less to minimize signal degradation, interference, and phase errors. This parameter optimization ensures high-fidelity signal transmission from the aperture array to the RF receiver, directly improving measurement precision.
3Productivity
If the bandwidth of the RF aperture array is increased to capture broader frequency range, then the productivity is improved, but the loss of energy increases
Solution Approach 1:
The system performs preliminary digitization of RF signals at the RF receiver, converting analog signals to digital format before further processing. This preliminary action enables efficient digital signal processing that can handle broadband frequencies while minimizing energy loss through optimized processing pathways.
Data Source
AI summary
A broadband RF imaging device includes a broadband RF aperture array, at least one RF receiver, and a computer. The at least one RF receiver has short RF connections with the broadband RF aperture array, e.g. length 10 meters or less. The computer has a digital data connection to the at least one RF receiver. Each RF receiver is configured to receive broadband RF signal data over a sampling time interval from the broadband RF aperture array, and to digitize the broadband RF signal data to generate digitized broadband RF signal data, and to store the digitized broadband RF signal data locally at the RF receiver. The computer receives the digitized broadband RF signal data stored locally at the at least one RF receiver, and is programmed to reconstruct an RF image from the digitized broadband RF signal data received from the at least one RF receiver.