Abstract: The constitution,function and installation of the microgravity measurement system used in the 1990 returnable satellite and the method of processing the microgravity data were introduced in this paper.It was pointed out that 4μg dynamic resolution and 6ms response time of the JS05-1A accelerometer have reached advanced world level of the same intru- ments. The application of our microgravity measurement system provided an effective means for understanding and improving the working condition of satellite.By analysising the data it was found that the working condition of the instruments was the main factor that affected the microgravity level in satellite,which is about 10~(-4)g.When major instruments turned off,the absolute value of 97.6% microgravity data was less than 4×10~(-5)g,0.3% of them was about 10~(-4)g and 1.23% of them was affected by the unknown disturbance which was over 10~(-4)g.

Key words: Recoverable satellite, Microgravity levels measurement, Data processing, China