On-Ground Test Method,Technology and Application of Space Electrostatic Accelerometer
Objectives:Satellite gravity measurement is the only direct means to obtain the global gravity field data.As the core payload of satellite gravity measurement,electrostatic accelerometer has the charac-teristics of high resolution and small measurement range.The lack of performance detection and evaluation means directly limits the development level and application efficiency of space electrostatic accelerometer in China.Methods:To meet the requirements of performance evaluation of high-precision accelerometers,re-search on ground test methods such as high-voltage suspension,torsion pendulum suspension,drop-tower test and development of the related technologies and devices have been carried out.The functional perfor-mance evaluation of high-precision electrostatic accelerometer series products was completed by combining various methods.Results:The high-voltage levitation test method was used to realize the long-term elec-trostatic suspension control of the test mass.Combined with the high-performance vibration isolation sys-tem,the ground test level reached 3×10-9 m/s2/Hz1/2 at 0.2 Hz.A torsional pendulum suspension test method was proposed,and the noise floor of the accelerometer reached about 2×10-11 m/s2/Hz1/2.And the six-degree-of-freedom control performance of the accelerometer was tested on the ground based on a vacuum tower drop device with a height of 20 m.Conclusions:A comprehensive test method system suitable for ground performance evaluation of high-precision space electrostatic accelerometers has been developed,which meets the needs of performance evaluation of high-precision accelerometers in the chinese gravity sat-ellites and other space missions.
万方数据
维普
