Study on suspension technique of space electrostatic accelerometer

Aiming at high accuracy gravity measurement, the satellite gravity surveying technique based on electrostatic suspension is studied in this paper. First, the hardware circuit of the electrostatic accelerometer is given, including the high accuracy displacement measurement circuit, the digital control circuit and the electrostatic force generation circuit. Then, based on analyzing the characteristics of electrostatic suspension, the suspension states are divided into initial levitation state and suspension state, and corresponding digital controllers are designed to suspend the rotor reliably. Simulation and experimental results show that the repeatability of the suspension center of the rotor is less than 0.01 μm, the repeatability of the suspension voltages is less than 0.5 [per mille] , and the 48 h stability of the suspension voltages is less than 2 [per mille] , which satisfies the requirements of the space electrostatic accelerometer.