PhotogrammetryBased onOrbit Modal Identification of Solar Arrays

Aiming at the disadvantages of traditional contact vibration measurement, an onorbit modal parameters identification method is presented based on photogrammetry for solar arrays. The specific process includes camera calibration, marking point detection, 3D coordinate calculation and modal identification. A binocular stereo vision measurement system made of two cameras and a computer are used for the ground test. The vibration displacement response of measuring points on solar array is obtained. ERA algorithm is used to identify the two main modal parameters of solar array. By comparing with the results measured by laser vibrometer, the effectiveness of the scheme is verified. The experiment shows that the photogrammetry is an ideal method in vibration measurement, which has high flexibility and requires for simple devices.