The computation equation and design criterion of real effective navigation ratio of homing control trajectory in PN homing guidance system were given.

给出了PN寻的制导系统的控制弹道实际有效导航比的计算公式及设计准则。

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The guidance, navigation and control(GNC) system, the brain system, is the one of the key systems of RLV. In this paper the mission requirements and system structure are first studied.

再入飞行是RLV飞行任务的重要阶段，而制导、导航与控制（GNC）系统则是RLV的核心系统之一，是RLV再入飞行的“脑系统”。

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Quality is a permanent problem. It is not only a lifeline of military products, but also a key problem of research and production in navigation, guidance and control system domain.

质量是一个永恒问题，更是军工产品的生命线，也是导航、制导与控制系统研制和生产中所存在的一个关键问题。

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"From early indications, it seems to be within our guidance navigation control system, seems to point toward hardware, " Olansen said.

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