Systems based on optical sensors form a major branch of missile defense technology. Examples include optical discrimination, scoring, fuzing, reconnaissance, homing, tracking, radiometric and spectrometric systems, both for flight and ground operation. When complete with signal processing chain, these systems are typically complex and costly, and their development poses major problems of product assurance. A common development sequence for such systems goes something like the following:
1. Paper design,
2. Idealized subsystem laboratory tests,
3. Subsystem fabrication,
4. Idealized subsystem laboratory,
5. System assembly
6. Idealized system laboratory test,
7. Operational system test,
8. Back to the drawing board.
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