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    伪随机信号(m序列)相关辨识的动态测试方法

    2013-08-07 中国测试期刊

    何华锋, 李元凯, 董海迪, 杨学猛
    (第二炮兵工程大学302室,陕西 西安 710025)
    摘  要:针对传统动态测试用时较长的问题,提出基于伪随机信号相关辨识的动态测试方法。对比传统仪器设备的动态测试方法,阐述基于伪随机信号(m序列)相关辨识的动态测试方法的整体结构,推导出离散系统脉冲响应估计的递推公式;基于估计的脉冲响应序列,应用Hankel矩阵法获得被测对象的传递函数以及幅频与相频特性。通过将估计的传递函数与实际标准化仪器设备的传递函数进行对比,验证该方法的正确性与精确性,且该方法具有用时少的优点。
    关键词:m序列;辨识;动态测试;Hankel矩阵
    中图分类号:V217+.31;V211.71;TP15;TP206+.1       文献标志码:A      文章编号:1674-5124(2013)04-0088-05
    Method of dynamic test based on pseudo-random signal (m-sequence) identification
    HE Hua-feng, LI Yuan-kai, DONG Hai-di, YANG Xue-meng
    (302 Department,Second Artillery Engineering University,Xi’an 710025,China)
    Abstract: As the fact that a long time is cost by traditional dynamic testing methods, a new method based on preudo-random signal (m-sequence) identification is introduced. Contrasting to the traditional dynamic method, the whole structure of the new method is described, and recurrence formulas to estimate the pulse response of the discrete system are derived. Based on the estimated pulse response sequence, the transfer function and the frequency characteristic of the measured are obtained with the application of Hankel-matrix method. The validation and accuracy of the approach is verified by the contrast experiment which compares the estimated transfer function with that of actual standardized instrument, meanwhile, this new method costs less time.
    Key words: m-sequence; identification; dynamic test; Hankel-matrix
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