研究发现：将33作为分界点对变量的范围进行分类，再运用导数就可以解决这个问题。
After some research, we find if we classify the variables ranges by 33 as a dividing point and apply derivative, we can work out this problem.
运用误差理论和偏导数原理，推导出转位误差与寻北误差二者之间的关系模型。
The mathematical model between position error and north seeking error is gotten through error theory and partial derivative principle.
运用比较原理和导数不连续的李雅普诺夫函数，结合分解集结等方法，研究具有滞后的测度型线性时变脉冲扰动大系统的全局指数稳定性。
The stability of time-delay and time-varying large scale systems with impulsive effect is investigated by means of the comparison principle and vector Lyapunov function with discontinuous derivative.
运用比较原理和导数不连续的李雅普诺夫函数，结合分解集结等方法，研究具有滞后的测度型线性时变脉冲扰动大系统的全局指数稳定性。
The stability of time-delay and time-varying large scale systems with impulsive effect is investigated by means of the comparison principle and vector Lyapunov function with discontinuous derivative.
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