Abstract: The inertial measurement unit (IMU) deployed on the reusable spacecraft not only meets the needs of long term space segment, but also needs to have high dynamic performance to meet the needs of high precision navigation during reentry. According to the needs of IMU deployed on the reusable spacecraft， the methods of dynamic accuracy design and verification in the development of reusable spacecraft IMU are summarized, and a six degree of freedom vibration IMU accuracy test method is introduced. The method can simulate the reentry mechanical environment more realistically, and can be triggered by system requirements to comprehensively evaluate the dynamic accuracy of IMU. It can also provide reference for other types of reusable spacecraft.

Key words: IMU, frequency characteristics, six degree of freedom vibration, reusable spacecraft, evaluation