In order to meet the requirement of high reliability and long life of inertial attitude sensor in future spacecraft,a 4S hemispherical resonator gyro inertial attitude sensor based on 4-channel redundancy scheme is firstly designed.Secondly,the key technologies in the development of high reliability and long life inertial attitude sensor are studied and verified.Finally,the in-orbit application of the proposed product is evaluated.The evaluation results showed that the 4-axis attitude measurement of the designed hemispherical resonant gyro inertial attitude sensor is normal,and in-orbit performance is equivalent to that of ground verification.Through comprehensive evaluation of ground verification and in-orbit application,the life of the designed product is not less than 20 years,and the reliability is not less than 0.98.
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