由于优化法和近似法均以显式公式给出，因而，这些方法设计简单，计算量少。
Because that explicit formulae are given out, optimization process are avoid and the design of fan filters is very simple.
在每次迭代中，主方向是通过求解一个总有解的寻找方向子问题产生，而辅助方向是由一显式公式计算产生。
At each iteration, a master direction is obtained by solving one direction finding subproblem which always possesses a solution, and an auxiliary direction is yielded by an explicit formula.
第一部份研究了需要速度的显式制导方法，给出了制导公式。
The first part is to discuss the method of explicit guidance of required-velocity, and obtains the formulation of guidance.
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