给出了一类变系数差分系统的全局渐近稳定的一些充分条件。
To one kind of difference system with variable coefficients, some sufficient conditions for global asymptotic stability of trivial solution are given.
把上下解方法应用到相应有限差分系统上，得到两个迭代序列。
Using the method of upper lower solutions we construct two monotone sequences for the finite difference equations.
因此，GPS差分协议和差分电文的算法是差分系统必须考虑的两个问题。
So the DGPS data formats and base station algorithm are the two important problems of DGPS system.
在GPS广域差分系统中，参考站需要进行高精度导航信号监测接收，并获得良好的伪距观测数据。
The reference station needs to monitor and receive the high-accuracy navigation signal in the wide area DGPS, and to get more accuracy data of pseudo-range observation.
由于过程特性的特殊性，常规pid控制算法和人工智能方法不能对组合积分系统进行有效的控制，控制精度差，有时甚至难于进行闭环控制。
Due to the speciality of the process, it is not effective to control combined integrating systems and leads to bad control accuracy with PID control algorithm or artificial intelligence method.
由于过程特性的特殊性，常规pid控制算法和人工智能方法不能对组合积分系统进行有效的控制，控制精度差，有时甚至难于进行闭环控制。
Due to the speciality of the process, it is not effective to control combined integrating systems and leads to bad control accuracy with PID control algorithm or artificial intelligence method.
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