The unconditionally stability and oscillations in kinds of 4-order delay difference equations are investigated by using analysis method,properties of algebra eqution and the logarithmic norm.
利用定性分析方法、代数方程根的性质及对数范数,研究了一类四阶时滞微分方程的无条件稳定性及实例的振动性,得到了该时滞微分方程无条件稳定性的充要条件,四次多项式函数在[-1,1]上无零点的充要条件。
In this paper, with definition of a norm of the relative error matrix, the difference between the sampled autocorrelation matrix and the ideal one is measured.
引入相对误差矩阵范数的定义,讨论了实际阵列天线输出样本的自相关矩阵与连续采样下自相关矩阵的差别,与采样快拍数、信号的相关性,信号与噪声之间的正交性以及噪声的正交性等因素的关系。