The Shuttle Columbia disaster has emphasized the importance of imaging in the detection of exterior damage of manned spacecraft in orbit. As in the case of Columbia, serious damage may not always be readily visible to astronauts from inside their vehicle. Various approaches to this problem are being investigated by NASA and other organizations. However, many of these methods require a number of months (or years) to implement the first set of tests.
This experiment proposes the test of a ground-based imaging system, using special optics and image processing, to determine the feasibility of developing an operational system. In principle, such a system would have a linear resolution on the International Space Station (ISS) of less than 20 cm. While a resolution of 1 cm or better would be ideal, this would be extremely expensive and require a long time to implement.
The SPQR experiment will be based on a Cube Corner Reflector (CCR) that will be fixed close to an ISS window and will reflect a laser beam coming from a ground station. If the test is successful, in the future it will also be possible to use a small inexpensive spherical mirror to provide the point source of light. This will passively reflect the sun, and would provide a bright specular reflection of the sun without any need for power or control of the orientation.
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