19 September 2001 Ladar measurements of the International Space Station
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The International Space Station (ISS) is an extremely large and flexible structure that requires validated structural models for control and operation. We have developed a 5-lb, 150 in3 laser radar to remotely measure vibration of the ISS structure and determine the structural mode frequencies and amplitudes. The Laser Dynamic Range Imager (LDRI) specifications include a 40-degree field of view, range resolution of 0.1 inches, images of 640 by 480 pixels, and a 7.5 Hz update rate. The sensor flew on the Space Shuttle in December of 2000 and provided range video of the newly installed P6 truss and solar array panels during thruster firing. Post flight analysis constructed motion time histories from selected structures. The measured vibration spectra captured the desired mode frequencies and amplitudes with a resolution of 0.02 to 0.1 inches. Additional measurements of curvature in the solar array panels demonstrated the potential for on-orbit characterization or inspection of structures.
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Colin L. Smithpeter, Colin L. Smithpeter, Robert O. Nellums, Robert O. Nellums, Steve M. Lebien, Steve M. Lebien, George Studor, George Studor, George H. James, George H. James, "Ladar measurements of the International Space Station", Proc. SPIE 4377, Laser Radar Technology and Applications VI, (19 September 2001); doi: 10.1117/12.440123; https://doi.org/10.1117/12.440123

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