A set of equations of optimal fixed-lag smoothing filter are obtained by using optimal fix-lag smooth time forward-recurrence algorithm and solving the built system mathematic model.
采用最佳固定滞后平滑的时间向前递推的算法，对所建立的系统数学模型求解，得出了最佳固定滞后平滑滤波的一组方程。
The solution of the problem is finally reduced to solving a set of infinite algebraic equations.
问题最后可归结为求解一组无穷型的线性代数方程。
This is a set of typical stiff ordinary differential equations, very small time step could only be adopted when solving the set of equations with common methods.
它是一组典型的刚性常微分方程组，用一般方法求解时只能选用很小的时间步长。
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