The purpose of this study is to develop a vibration characteristic of space antenna structure composed of inflatable structure and CFRP, and we do a micro gravity test using a parabolic flight by a jet plane. Because of this structure is very light, so we can't fix sensors on it. Therefore we try to measure it without contact by using image processing and we find that the first natural frequency of this structure is about 2.77Hz. Then, we carry out dynamics analysis with a single degree of freedom (SDOF) model and we obtain that the frequency of SDOF model is 3.04Hz and it is very close to the result of micro gravity test.
