Inter-satellite communication instruments require a very-high pointing stability and accuracy, for example, on the order of one micro-radian. This is reachable by means of controlling the employed FPM(Fine Pointing Mechanism)in a wide frequency range. The Japanese Experimental Module (JEM) of the International Space Station will have larger vibrational disturbances than general satellites. When these larger vibrational disturbances occur ,it will no be adequate to make a high gain controller suppress these disturbances in a wide frequency range for the precise pointing system. Therefore, we propose the use of a vibration isolator, which is effective for laser communication instruments, to reduce the transmission of vibration from the spacecraft body such as JEM to the pointing system .The vibration isolator we have developed can attenuate disturbances for six degrees of freedom. This paper describes the mechanism ,a hybrid control method that consists of passive and active controls ,and experimental results .The experimental results for properties of the vibration isolator indicate that under severe vibrational circumstances, the vibration isolator can be effective in reducing the transmission of vibration to sensitive instruments. This work was performed under contract with the Communications Research Laboratory.
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