Comparing with resolution method, it is an indirect system optimization method.
相对解析法而言，它是一种间接的系统优化方法。
To improve the method, we make use of indirect approximation method to solve the optimization problem.
为了改进所给出的方法，用间接逼近方法求解优化问题。
Three kinds of trajectory optimization methods including Indirect method, Hybrid method and Gauss pseudospectral method, as well as solving thoughts were given in this paper.
本文给出三种求解轨道优化设计问题的方法（间接法、混合法和高斯伪谱方法）及求解思路。
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