基于DSP和FPGA的静电悬浮加速度计控制器设计

针对静电悬浮加速度计高稳定悬浮控制和极微小加速度信号处理需求，设计了一种基于数字信号处理（digital signal processor,DSP)和现场可编程门阵列（field programmable gate array,FPGA)的加速度计控制器。该控制器采用DSP作为主控芯片，FPGA为辅助控制芯片。基于加速度计的工作特性，设计了一种加速度计工作模式切换控制策略，可根据加速度计当前工作状态，自动或者手动切换工作模式。基于加速度计的工作原理和测量需求，设计开发了基于FPGA的比例、积分、微分(proportional integral derivative,PID)控制算法和有限冲击响应(finite impulse response,FIR)滤波算法。为验证该控制器的控制性能，开展了地面高压悬浮实验。结果表明，该控制器及控制算法可以快速准确地实现加速度计稳定悬浮控制和模式切换，并且可以实现软件在轨重构和控制参数在轨更新，为后续重力场探测、空间引力波探测以及自主导航等提供了工程参考依据。

Design of electrostatic levitation accelerometer controller based on DSP and FPGA

Aiming at the requirements for high-stable suspension control and extremely small acceleration signal processing of electrostatic levitation accelerometers, an accelerometer controller based on DSP and FPGA was designed. The controller uses DSP as the main control chip and FPGA as the auxiliary control chip. Based on the working characteristics of the accelerometer, an accelerometer working mode switching control strategy is designed, which can automatically or manually switch the working mode according to the current working status of the accelerometer. Based on the working principle and measurement requirements of the accelerometer, an FPGA-based PID control algorithm and a FIR filtering algorithm were designed and developed. In order to verify the control performance of the controller, a ground high voltage suspension experiment was carried out. The results show that the controller and control algorithm can quickly and accurately achieve stable suspension control and mode switching of the accelerometer, and can realize on-orbit software reconstruction and on-orbit update of control parameters, providing a basis for subsequent gravity field detection, space gravitational wave detection and autonomous Navigation, etc. provide engineering reference basis.