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    偽隨機信號(m序列)相關辨識的動態測試方法

    2013-08-07 中國測試期刊

    何華鋒, 李元凱, 董海迪, 楊學猛
    (第二炮兵工程大學302室,陜西 西安 710025)
    摘  要:針對傳統動態測試用時較長的問題,提出基于偽隨機信號相關辨識的動態測試方法。對比傳統儀器設備的動態測試方法,闡述基于偽隨機信號(m序列)相關辨識的動態測試方法的整體結構,推導出離散系統脈沖響應估計的遞推公式;基于估計的脈沖響應序列,應用Hankel矩陣法獲得被測對象的傳遞函數以及幅頻與相頻特性。通過將估計的傳遞函數與實際標準化儀器設備的傳遞函數進行對比,驗證該方法的正確性與精確性,且該方法具有用時少的優點。
    關鍵詞:m序列;辨識;動態測試;Hankel矩陣
    中圖分類號:V217+.31;V211.71;TP15;TP206+.1       文獻標志碼:A      文章編號: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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