偽隨機信號（m序列）相關(guān)辨識的動態(tài)測試方法
中國測試期刊
何華鋒， 李元凱， 董海迪， 楊學(xué)猛
（第二炮兵工程大學(xué)302室，陜西 西安 710025）
摘 要：針對傳統(tǒng)動態(tài)測試用時較長的問題，提出基于偽隨機信號相關(guān)辨識的動態(tài)測試方法。對比傳統(tǒng)儀器設(shè)備的動態(tài)測試方法，闡述基于偽隨機信號（m序列）相關(guān)辨識的動態(tài)測試方法的整體結(jié)構(gòu)，推導(dǎo)出離散系統(tǒng)脈沖響應(yīng)估計的遞推公式；基于估計的脈沖響應(yīng)序列，應(yīng)用Hankel矩陣法獲得被測對象的傳遞函數(shù)以及幅頻與相頻特性。通過將估計的傳遞函數(shù)與實際標準化儀器設(shè)備的傳遞函數(shù)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(yōu)點。
關(guān)鍵詞：m序列；辨識；動態(tài)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
