Because of the fading characteristic in troposcatter channel, the mechanism of traditional phase locked loop is difficult to achieve the effect in troposcatter communication.

由于对流层散射信道存在严重的衰落现象，故而传统的锁相环机制在散射通信中往往难以奏效。

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Then we briefly explain the basic theory of Phase Locked Loop (PLL) and the basic characteristic of its components.

然后从相位角度分析了锁相环环路模型，给出了相位传递函数；

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Then we briefly explain the basic theory of Phase Locked Loop (PLL) and the basic characteristic of its components.

然后从相位角度分析了锁相环环路模型，给出了相位传递函数；

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