基于FPGA的高精度石英振梁加速度计频率测量方法研究  

Research on Frequency Measurement Method of High-Precision Quartz Vibrating Beam Accelerometer Based on FPGA

作　　者：刘珑珑 孟俊芳[1] LIU Longlong;MENG Junfang(China Air-to-Air Missile Academy,Luoyang 471009)

机构地区：[1]中国空空导弹研究院,洛阳471009

出　　处：《现代计算机》2021年第16期37-40,共4页Modern Computer

摘　　要：石英振梁加速度计直接输出与加速度成比例的频率信息,频率测量的微小误差会随着时间积分积累,导致运载体的运动速度、实时位置产生较大偏差。为了实现对石英振梁加速度计输出信号频率的高精度测量,结合某型产品的设计需求,对比分析等精度测频法和等周期测频法的测量原理和测量精度进行对比分析,并基于FPGA进行仿真和试验。仿真试验结果表明,无论是在静态环境下还是在大过载环境下,相比于等精度频率测量法,等周期频率测量法测量精度更高,误差更小,更适用于空空导弹系统中高精度石英振梁加速度计输出信号的频率测量。The quartz vibrating beam accelerometer outputs the frequency information proportional to the acceleration directly. The small error of the frequency measurement will accumulate over time,resulting in a large deviation in the moving speed and real-time position of the carrier.In order to achieve high-precision frequency measurement of the output signal of the quartz vibrating beam accelerometer,combined with the design requirements of a certain type of product,the paper compares the performance of the equal-precision frequency measurement method and the equal-period frequency measurement method with a simulation test based on FPGA. The simulation results show that,compared with the equal-precision frequency measurement method,the equal-period frequency measurement method has higher measurement accuracy and smaller error,whether in a static environment or a large overload environment,and is more suitable for the frequency measurement of the output signal of the high-precision quartz vibrating beam accelerometer in air-to-air missile systems.

关 键 词：频率测量 加速度计 等精度测频法 等周期测频法 现场可编程门阵列(FPGA) 

分 类 号：TH824.4[机械工程—仪器科学与技术]