Phased Array Beam Steering for Multi-Target SAR Imaging
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Solution Overview
Problem
Traditional synthetic aperture radar (SAR) and inverse synthetic aperture radar (ISAR) imaging methods waste significant time in listening phases due to the alternation of transmission and listening phases, with only a small portion of the listening phase producing useful signals, leading to inefficient use of resources.
Innovation Solution
A phased array antenna system that dynamically applies different phase laws to radiating elements to simultaneously image multiple target areas by interleaving transmission and reception cycles, optimizing the use of electronic scanning flexibility to reduce pointless listening times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional SAR/ISAR imaging methods are used with alternating transmission and listening phases, then distance resolution and angular resolution can be achieved, but the listening time is wasted because only a small portion of the listening phase produces useful signals
Solution Approach 1:
The patent divides the imaging process into multiple independent synthetic aperture imaging tasks that can be performed simultaneously. By segmenting the listening phase into multiple parallel imaging processes, the system utilizes previously wasted listening time for productive imaging operations, thereby resolving the contradiction between achieving high resolution and minimizing time loss.
Solution Approach 2:
The patent introduces a temporal dimension by performing multiple synthetic aperture imaging processes in parallel during the listening phase. This dimensional expansion allows the system to transition from sequential single-target imaging to simultaneous multi-target imaging, converting wasted listening time into productive imaging operations.
2Productivity
If multiple synthetic aperture imaging processes are performed simultaneously using electronic scanning, then total acquisition time is reduced, but the system complexity increases due to multiple phase laws and control mechanisms
Solution Approach 1:
The phased array antenna system is designed to perform multiple functions simultaneously - it can execute multiple synthetic aperture imaging processes in parallel by applying different phase laws to different target areas. This multi-functionality allows a single system to achieve the productivity benefits of multiple imaging processes without requiring separate dedicated systems for each task.
Solution Approach 2:
The system dynamically adjusts phase laws and beam directions in real-time during the listening phase to accommodate multiple simultaneous imaging processes. By making the phase control dynamic rather than static, the system can flexibly switch between different imaging tasks, managing the complexity through adaptive control rather than fixed complex architecture.
3Adaptability or versatility
If electronic scanning is used to point the beam in different directions, then multiple target areas can be imaged, but the beam pointing precision must be maintained across different phase laws
Solution Approach 1:
The patent applies different phase laws specifically tailored to each target area's geometric characteristics. By customizing the phase law for each local imaging task rather than using a universal approach, the system maintains optimal beam pointing precision for each specific target area while preserving overall beam direction flexibility.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method and system enable the production of multiple high-resolution images in the same time frame as a single image in traditional methods, reducing total acquisition time and improving resource efficiency by utilizing dead listening times for additional imaging processes.
Implementation Method 1
controlling the application of a first determined phase law to electrical signals for supplying power to the unitary radiating elements of the array antenna in order to direct the antenna radiation towards a first target area
Implementation Method 2
transmitting waves and receiving echoes of said transmitted waves and for analysing the received echoes
Implementation Method 3
imaging stemming from the analysis of reflections (echoes), of transmitted signals, from obstacles encountered by the transmitted signals
Data Source
AI summary
A detection system includes a phased array antenna having unitary radiating elements, the system being suitable for, in each cycle, successively directing, by way of the successive application of a first and a second determined phase law to the electrical signals for supplying power to the array antenna, the antenna radiation towards a first target area (Z1), then a second target area (Z2), which is separate from the first target area (Z1), and determining an image of each target area (Z1) on the basis of the echoes received from each of the first and second target areas.