Interlaced Multi-SCA Focal Plane Array for Wide-Area Surveillance
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Solution Overview
Problem
Current visual/optical surveillance systems face challenges in efficiently scanning wide areas with high resolution and quick revisit rates, as continuous scan TDI systems, large monolithic focal plane arrays, and two-axis scan mirrors are either ineffective or costly and prone to failure.
Innovation Solution
A multiplicity of smaller staring Sensor Chip Assemblies (SCAs) are arranged into a larger multi-SCA Focal Plane Array with a single-axis scan mirror and interlaced FPAs, allowing for overlapping images to create a large, effective array, which can be extended in both dimensions using segmented arrays and rapid-stepping mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If large monolithic focal plane arrays are used, then area coverage is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent divides the large focal plane array into multiple smaller sensor chip assemblies (SCAs) arranged in a modular configuration. Each SCA contains its own detector elements and readout circuitry, allowing independent manufacturing and testing. These modular units are then combined to form the complete large-area array, significantly reducing manufacturing complexity while achieving the required area coverage for wide-area surveillance.
2Area of stationary object
If continuous scan TDI systems are used, then wide area coverage is improved, but resolution and revisit rate deteriorate
Solution Approach 1:
The patent replaces the mechanical continuous scanning mechanism of TDI systems with an electro-optical staring array approach. The modular SCA architecture with electronic beam steering and digital image processing achieves wide area coverage through electronic means rather than mechanical scanning, thereby maintaining high resolution and fast revisit rates without the mechanical complexity and resolution loss inherent in continuous scan systems.
3Adaptability or versatility
If two-axis scan mirrors are used, then range of view is improved, but speed and reliability deteriorate
Solution Approach 1:
The patent extracts the scanning function from complex two-axis mechanical mirror systems and implements it through simpler electronic beam steering mechanisms integrated with the modular SCA architecture. This extraction of the mechanical scanning component and replacement with electronic control achieves the required range of view while dramatically improving scanning speed and system reliability by eliminating mechanical wear and alignment issues.
4Speed
If smaller single SCAs are used in fast 2-dimensional step-staring approaches, then scanning speed is improved, but scalability and manufacturing difficulty worsen
Solution Approach 1:
The patent merges multiple smaller SCA units into a coordinated modular array system where each unit operates in a fast step-staring mode. The modular design with standardized interfaces and unified control architecture enables easy scaling from small to large configurations while maintaining high scanning speeds. This combination approach allows parallel operation of multiple SCAs, achieving both fast scanning and manufacturing scalability.
Data Source
AI summary
Systems and methods of acquiring large field of view, high-resolution image data are discussed herein. Techniques and devices relate operation and composition of systems for acquiring large field of view, high-resolution image data. Such systems may include a first sensor chip assembly (SCA) in an interlaced focal plane array (FPA), the first SCA having a length, a width, and a resolution; a second SCA in the FPA, the second SCA having the same length, width, and resolution; and a field of view (FOV) adjustment device that moves the FOV of the FPA so that it can observe different scenes. In some such systems, the first and second SCAs are arranged relative to each-other in a first spaced array extending along a first dimension of the FPA such that there is an intentional gap between the first and second FPAs along the first dimension.