在此基础上提出了作者对地球静止卫星南北位置保持控制系统的选择原则和看法。

On the basis of that, some selection criteria and opinions for NSSK control system have put forward.

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将微波等离子推力器(MPT)应用于“东方红三号”(DFH 3)卫星的推进子系统，完成其轨道转移和南北位置保持任务。

Microwave plasma thruster (MPT) was applied to the sub system of DFH 3 satellite to complete its orbit transfer (OT) and north south station keeping (NSSK).

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