基于MEMS传感器的弹载数字惯性测量组合设计  

Design of missile⁃borne digital inertial measurement unit based on MEMS sensor

作　　者：王瀚 李杰 雷文彬 张波 WANG Han;LI Jie;LEI Wen-bin;ZHANG Bo(School of Instrument and Electronics,North University of China Dynamic Testing Technology Jointly⁃promoted Base of National Key Laboratory,Taiyuan 030051,China;Suzhou Fashion Nano Technology Co.,Ltd.,Suzhou 215123,China)

机构地区：[1]中北大学仪器与电子学院动态测试技术省部共建国家重点实验室培育基地,山西太原030051 [2]苏州中盛纳米科技有限公司,江苏苏州215123

出　　处：《电子设计工程》2020年第12期167-171,共5页Electronic Design Engineering

基　　金：国家自然科学基金(51575500)。

摘　　要：MEMS惯性传感器组成的惯性测量组合,在弹载测试中有着广泛的应用。但由于MEMS传感器多为模拟输出,解算系统难以简单方便的获取物理量信息,而且模拟量在传输过程中易受到外界环境因素的干扰,影响测量结果。针对以上问题,设计了一种数字惯性测量组合,以FPGA作为主控芯片,控制ADC时序,将传感器输出转为数字量,并且对采集到的数字量进行实时解析处理,利用分布式算法,实现FIR低通数字滤波,并建立了常用温度域理想温度补偿模型,以及安装误差补偿模型,采用RS-422方式输出传感器测量的物理量,对惯性测量组合的测量精度,长线传输稳定性,有明显提升。可以实现测量组合与解算系统分离式安装,便于弹载环境下狭小空间测试,同时简化了后续解算过程。The inertial measurement unit composed of MEMS inertial sensors has a wide range of applications in the missile test.But because MEMS sensors are mostly analog outputs,the solution system is difficult to obtain physical quantity information conveniently.Moreover,the analog quantity is susceptible to interference from external environmental factors during the transmission process,affecting the measurement results.In response to the above questions.A digital inertial measurement unit is designed.The FPGA is used as the main control chip to control the ADC timing,convert the sensor output into digital quantity,and analyze the collected digital quantity in real time.Realize FIR low⁃pass digital filtering with distributed algorithm.And the ideal temperature compensation model of the common temperature domain and the installation error compensation model are established.Output physical quantity measured by RS⁃422.Separate installation of measurement unit and solution system can be realized,which is convenient for narrow space test in the missile environment and simplifies the subsequent solution process.

关 键 词：MEMS FPGA 分布式算法 数字滤波器 温度补偿 

分 类 号：TN6[电子电信—电路与系统]