Modular Multi-Angle SAR Track Sensor for Simultaneous Imaging
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Solution Overview
Problem
Current multi-angle SAR sensors face limitations such as high system cost, spectrum ambiguity, reduced imaging footprint, and computational intensity due to complex hardware and software requirements, which affect imaging accuracy and efficiency.
Innovation Solution
A modular SAR sensor with five degrees of freedom, utilizing multiple transceivers mounted on track segments and a multi-axis gimbal system, allowing flexible positioning and simultaneous multi-angle imaging operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If electronic beam steering is used to achieve multi-angle SAR sensing, then multi-angle imaging capability is improved, but system complexity and cost increase significantly
Solution Approach 1:
The SAR sensor is divided into multiple transceivers mounted on separate track segments, each capable of independent positioning and imaging. This segmentation allows multi-angle imaging through physical separation rather than complex electronic beam steering, reducing system complexity while maintaining versatility.
Solution Approach 2:
The track segments and transceivers are made dynamically adjustable with five degrees of freedom, allowing real-time reconfiguration of the sensor array geometry. This dynamic adaptability enables multi-angle imaging without requiring complex fixed electronic beam steering systems.
2Adaptability or versatility
If spotlight SAR mode is used to expand observation angle, then multi-angle coverage is improved, but spectrum ambiguity increases and imaging footprint decreases
Solution Approach 1:
The observation space is divided among multiple transceivers, each handling a specific angular sector. This segmentation eliminates spectrum ambiguity by ensuring each transceiver operates within its own unambiguous bandwidth range while collectively achieving wide angular coverage.
Solution Approach 2:
The system transitions from a single-dimensional beam steering approach to a multi-dimensional spatial arrangement of multiple transceivers on track segments. This dimensional change allows simultaneous wide-angle coverage without the spectrum ambiguity constraints of traditional spotlight mode.
3Adaptability or versatility
If wide azimuth beam SAR is used to increase imaging angle, then angular coverage is improved, but range cell migration increases and imaging accuracy decreases
Solution Approach 1:
The wide azimuth imaging task is segmented across multiple transceivers, each handling a narrower angular sector with reduced range cell migration. This segmentation maintains imaging accuracy while achieving wide overall coverage through the combined output of multiple precision subsystems.
4Area of stationary object
If multiple flight paths are used to achieve large imaging scope, then imaging coverage is improved, but flight efficiency decreases and system cost increases
Solution Approach 1:
The sensor array geometry is dynamically reconfigured in real-time to achieve large imaging scopes from a single flight path. The five-degree-of-freedom track system allows the transceivers to adjust their positions and orientations to cover different areas, eliminating the need for multiple flight paths and improving flight efficiency.
Data Source
AI summary
A synthetic aperture radar sensor having five degrees of freedom (DoF) is disclosed. The five DoF enable multiple imaging operations, including multiple simultaneous imaging operations. The sensor includes multiple transceivers mounted to track segments, with variable spacing between the transceivers being the first DoF. The second DoF is about a vertical axis allowing side-to-side motion of the transceivers. The third DoF is about a horizontal axis parallel to a direction of travel with the segments perpendicular to the direction of travel, thereby allowing the transceivers to form a horizontal line, a vertical line, or some intervening angle. The transceivers can be at different angles, corresponding to the fourth DoF, which permits simultaneous vertical and side-looking operation. The fifth degree of freedom is about a horizontal axis parallel to the direction of travel with the segments parallel to the direction of travel, allowing pointing of the transceivers at a desired scene.