互相关技术中基于零阶保持器的离散冲激响应模型  

A Zero-Order-Hold Based Discrete-time Impulse Response Model in the Cross-correlation Technique

作　　者：罗洁[1] 瞿安连[1] 

机构地区：[1]华中科技大学生命科学与技术学院,武汉430074

出　　处：《计算机与数字工程》2012年第3期34-36,39,共4页Computer & Digital Engineering

基　　金：国家自然科学基金(No.60571011;No.30327001)资助

摘　　要：利用互相关技术能有效估计线性系统的冲激响应。然而,对于基于数值计算的互相关技术,D/A和A/D转换器的使用必然会带来原理性的误差。该文利用零阶保持器(ZOH)模型从理论上分析了离散时间系统的冲激响应,即它与连续系统冲激响应之间的关系,并给出了时域解析表达式。通过该公式可以直观地把握冲激响应估计的逼真度。The cross-correlation technique can be used to estimate the impulse response of a linear systero. However, the use of the D/ A and A/D converters inevitably causes systematic errors. A theoretical analysis of the discrete-time impulse response estimated in a sampling system is performed. The relationship between discrete-time and continuous-time impulse responses is studied, and an analytical equation is deduced based on the Zero-Order-Holder （ZOH）. With the equation, an intuitive grasp of the fidelity of the estimated impulse response to that of the real system can be obtained.

关 键 词：零阶保持器 互相关 冲激响应 

分 类 号：TP13[自动化与计算机技术—控制理论与控制工程] TP202[自动化与计算机技术—控制科学与工程]