Detector Module Multi-Chip Carrier TDI-CCD CMOS Integration
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Solution Overview
Problem
Current detector modules for super-resolution satellites face limitations in increasing line rate due to data processing speed constraints with TDI-CCD detectors and are inferior in rapidly moving satellites when using CMOS detectors, leading to information loss and thermal stress issues.
Innovation Solution
A multi-chip carrier integrating TDI-CCD and CMOS chips with digital output electronics, utilizing CMOS technology for A/D converters and multiplexers, and thermal decoupling through ceramic materials like aluminum nitride and oxide, along with flip chip technology and bonding wires, to enhance read-out speed and reduce thermal stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the line rate is increased to increase geometric resolution, then measurement precision is improved, but data processing speed becomes insufficient
Solution Approach 1:
The detector is divided into multiple TDI lines (e.g., 1024 lines) with each line containing multiple pixels (e.g., 2048 pixels). Each pixel has its own register that can be independently controlled, allowing parallel processing of data from different lines while maintaining high resolution. This segmentation enables the system to handle high line rates by distributing the processing load across multiple independent channels.
2Reliability
If TDI-CCD detectors are used to maintain continuous charge transport, then reliability is improved, but read-out speed is limited
Solution Approach 1:
The invention introduces dynamic control of register loads and masking patterns. The load capacity of registers can be adaptively adjusted, and masking patterns can be dynamically changed to optimize between continuous charge transport and read-out speed. This dynamic approach allows the system to maintain reliability through continuous transport while achieving higher read-out speeds through optimized register management.
3Productivity
If CMOS detectors are used to increase read-out speed, then productivity is improved, but measurement precision deteriorates in rapidly moving satellites
Solution Approach 1:
The invention uses an intermediary approach by combining TDI-CCD technology (which provides continuous charge transport and high MTF) with advanced register management and masking techniques. The TDI-CCD detector serves as the intermediary that bridges the gap between the need for continuous transport and the requirement for high read-out speeds, achieving both through optimized register load capacity and masking patterns.
4Reliability
If register load capacity is enlarged to reduce information loss, then reliability is improved, but read-out speed of individual line is reduced
Solution Approach 1:
The invention transitions from a single-dimension approach (increasing register capacity in one line) to a multi-dimensional solution by utilizing multiple TDI lines with coordinated masking patterns. Instead of enlarging registers in one line, the system distributes information across multiple lines and uses temporal-spatial masking to retrieve information, achieving both high reliability and maintained read-out speed through this dimensional transformation.
Data Source
AI summary
A detector module, in particular for super-resolution satellites, contains a multi-chip carrier. At least one TDI-CCD detector and at least one CMOS chip are arranged on the multi-chip carrier, and are electrically connected to one another. The CMOS chip contains at least the digital output electronics for the TDI-CCD detector.