| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and a device which uses an optical detector, performs observation of one or a plurality of debris, determines moving speed and moving direction of the debris based on trace of debris' movement recorded in an image provided from the detector. SOLUTION: A detector 1 is an optical detector, is loaded on a spacecraft such as a space station and an artificial satellite together with an image processing device and a display device 2, and detects and observes debris 3 moving on an orbit. The display device 2 displays trace of a debris, and can determine speed and moving direction of the debris based on length, change in thickness, and direction of the trace.
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