摘要
针对传统石英挠性加速度计模拟再平衡回路的不足,研究设计了一种加速度计数字再平衡回路。通过系统参数辨识的方法,获得加速度计表头的数学模型;采用增量式PID控制算法,设计加速度计闭环系统;在硬件结构上选用浮点型DSP作为控制单元,采用外扩式AD/DA模块,提高转换精度。实验结果表明:加速度计系统带宽为190Hz,响应时间为1.6ms,稳态误差为0。所设计的数字再平衡回路有效改善了系统动静态特性,提高了输出精度。
Aiming at shortage of traditional rebalance loop of quartz flexible accelerometer,an accelerometer digital rebalance loop is researched and designed. By system parameter identification method to obtain mathematical model for gauge outfit of accelerometer; using incremental PID control algorithm,design closed-loop system of accelerometer; as for hardware structure,floating-point DSP is chosen as control unit,adopt expanding type AD / DA module to improve conversion precision. Experimental results show that bandwidth of accelerometer system is 190Hz and response time is 1. 6ms respectively,steady-state error is 0. The digital rebalance loop effectively improve static and dynamic performance,significantly improves output precision.
出处
《传感器与微系统》
CSCD
2015年第3期103-105,109,共4页
Transducer and Microsystem Technologies
基金
国家自然科学基金资助项目(6130424)
