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”。
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.
飞行器制导精度评估，特别是航天器的姿态与定点控制、落点预报等，都离不开高精度的外弹道测量数据。
Assessing the accuracy of guidance system, especially controlling of missile's attitude and station keeping maneuver and landing point forecasting all rely on the reliable trajectory measurement.
仿真结果表明，与实际飞行试验数据达到非常好的拟合，说明采用六自由度的制导控制系统的数学模型进行设计的正确性。
Numerical simulation results for sample engagement scenarios are given. It shows that simulation results are very close to the actual flight test results. So …
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