基于相位差检测算法的磁栅导轨拼接技术研究  

Research of Magnetic Grid Rail Splicing Technology Based on Phase Difference Detection Method

作　　者：李芳[1] 谷文韬[1] 雷少坤[1] 周少伟[1] 

机构地区：[1]西北工业大学机电学院,西安710072

出　　处：《计算机测量与控制》2013年第7期1978-1982,共5页Computer Measurement &Control

基　　金：国家自然科学基金(50875210);西北工业大学研究生创业种子基金(z2013023)

摘　　要：针对磁栅导轨在拼接过程中,磁栅信号检测实时性差、精度低、工程应用困难等问题,文中确立了进行多段导轨磁栅数据平滑读取的双磁栅读数头"换班"规则,提出了一种以双磁栅读数头输出信号的相位差精确调零进行磁栅导轨拼接的方法;相位差精确调零采用基于一种Nuttall窗双信号相位差高精度检测算法,该算法不要求被检信号频率恒定和整周期采样,可有效地降低和抵消因加窗所造成的频谱泄漏、栅栏效应及信号频率变化造成的相位误差;并对相位差检测算法进行了仿真试验和工程验证,结果表明,与传统拼接方法相比,采用文中给出的磁栅导轨拼接方法进行导轨拼接,磁栅读数头以任意速度和加速度通过导轨接缝,均可实时进行精确的相位差检测,以完成导轨拼接。In order to meet the high real-time performance, high accuracy and well-suited engineering application requirements of mag- netic grid signal detection in the magnetic grid rail splicing process, this paper attempts to establish two reading heads “shift” rules which can guarantee magnetic grid data integrity of multiple rails and proposes a new type of magnetic grid rail splicing method based on accurately zero- ing output signal phase difference of two magnetic grid reading heads. The accurate zero setting technology of phase difference is based on Nuttall window double signals high-precision detection algorithm, which not only doesn＇t need to give the exact signal frequency beforehand and sample synchronously, but also can effectively eliminate the phase error caused by spectrum leakage, huddle effect and signal frequency variation. Additionally, simulation test and engineering verification were performed on the phase difference detection algorithm and ＂shift＂ rules. The results shows that, compared with traditional methods, the method mentioned in this paper can achieve real--time detection of phase difference when reading heads go over buff joints with any speed or any acceleration.

关 键 词：磁栅导轨 拼接 相位差 “换班”规则 Nuttall窗 

分 类 号：TJ765.41[兵器科学与技术—武器系统与运用工程]