关键词 : 锁相环 ;平方环 ;科斯塔斯环 ;相位估计 [gap=675]Key words : PLL ;squaring loop ;Costas loop ;p hase estimation
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采用平方环实现载波同步信号的提取。
第五章中给出了对各种调制方式的解调模型，成功建立了平方环载波恢复模型。
In chapter 5, demodulation models of many modulation systems are established. Square loop model is established to detect carrier.
多环芳烃在水平方向上的迁移存在色谱效应。
There was a chromatographic effects in the horizontal migration of the PAHs.
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