在脉冲相位键控(PPK)再入遥测系统中，除了传输常规遥测信号外，还要传输特种遥测信号，即单次宽脉冲信号。

Telemetry signals, which are not only convention but also a special type-single wide-pulse ones, are transmitted by the pulse Phase Key (PPK) Reent rant Telemetry system.

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首先，利用奇异摄动理论对再入飞行器状态变量进行两个时间尺度的划分，将系统状态方程分解成两个低维子系统。

Firstly, the state variables of the reentry vehicle are decomposed into two sub-systems of different time scales using the singular perturbation theory.

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分析结果表明，反导系统红外探测器在再入飞行段的最佳工作波段是短波和中波。

The analysis results demonstrate that the infrared detector of the anti-missile system in the reentry can work well on short wave and medium wave.

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