基于V/F转换的自标定加速度计数据采集处理单元  

Data Acquisition and Processing Part of Accelerometers Self-calibration Unit Based on V/F Convertor

作　　者：李宝林[1] 卜继军[1] 帅师师[1] 陈朝春[1] 叶刚[1] 毛世平[1] 

机构地区：[1]四川压电与声光技术研究所,重庆400060

出　　处：《压电与声光》2009年第5期636-639,共4页Piezoelectrics & Acoustooptics

基　　金：中国电子科技集团公司创新基金资助项目(JJ0616)

摘　　要：自标定加速度计组合是将加速度计与标定装置有机结合的新型惯性组件,采用高精度的转位/锁紧机构,利用重力场下敏感器件多位置翻滚的方法分离出加速度计(组合)的各项模型参数。为保证其高精度,采用了基于电压-频率(V/F)转换的数据采集单元来完成加速度计信号的数字化。V/F转换器将加速度计输出的模拟信号转换为脉冲量,FPGA采集脉冲量并转换得到自标定模型所需数字量。在单片机中进行数字滤波有效地降低了数据中的噪声。实验证明,基于V/F转换的数据采集系统为自标定加速度计组合的标定解算提供了低噪声、高精度的数据,从源头上保证了自标定的高精度。The accelerometers self calibrated unit combining accelerometers with calibration equipment is a new inertial unit and the high precision rotation and lock mechanism is used to identify the model parameters of the accel erometers with the method of varied positions rotations in gravity field. High precision of data acquisition of aceelerometers signal is achieved with V/F convertors. V/F convertors convert accelerometers analog signal into impulse which is transmitted to FPGA and converted digital signal. Digital filter is used in MCU to effectively reduce noises in the digital signal. The experiment testifies that the data acquisition system based on V/F convertors can provide high precision data with low noises for the computation of the accelerometers self-calibration, which ensures high precision of the accelerometers self-calibration from the data source.

关 键 词：加速度计组合 V/F转换器 数据采集 自标定 

分 类 号：V241[航空宇航科学与技术—飞行器设计]