【Key words】 descriptor systems with delay; observer design; observability matrix; polynomial matrix
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分别引入了解决这一问题的状态空间方法和多项式矩阵插值方法。
Both the state space method and the polynomial matrix interpolation method are introduced to solve the problem.
其中一元多项式矩阵的性质已经归纳出很多，但是对二元乃至多元多项式矩阵性质的探讨仍旧很少。
The property of polynomial of one indeterminate matrix has been summed up a lot, but polynomial in two elements and multivariate polynomial of the matrix are discussed a little.
应注意在构造ARMA新息模型时，必须进行多项式矩阵的左素分解，才能得到正确的ARMA新息模型。
Notice that constructing the ARMA innovation model, a left co-prime factorization to a polynomial matrix must be performed, so that the ARMA innovation model can correctly be obtained.
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