This paper also touches upon the features of differential modulation and demodulation 分析阐述了差分调制与解调的特点。
" invert " phenomenon is inevitable when costas is used to make baseband recovery . differential modulation can avoid erroneous recovery in the receiver 在用科思塔斯环作基带恢复时会不可避免地出现“倒”现象,用差分调制可以避免在接收端发生错误的恢复。
It introduces the method of modulated light subtracting infrared radiation of atmosphere and background as well as the method of phase - lock - loop detecting feebleness signal 采用光路差分调制的方法实时扣除背景红外辐射,并采用锁定放大器进行微弱信号的检测。