文中基于卫星相对运动状态转移方程，推出了星座双脉冲式变轨控制的理论解；
In this paper, thinking of three-satellite constellation, optimal impulse orbit transfer is studied for constellation launching.
特别是由推力协同变轨所导致的奇异最优控制问题到目前尚没有完全解决。
Up to now the singular optimal control problems in the thrust synergetic orbital transfer have not been completely solved.
基于最优控制理论，将一个最优变轨问题转化成一个两点边值问题。
The optimal transfer problem is converted into Two-Point Boundary Value problem based on optimal control theory.
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