The remote sensing satellite earth station is composed by antenna, feed subsystem , servo subsystem, receiver, station manage subsystem, modulator, demodulator, recorder and quick view equipment.
This paper designed a full digital modulator and a full digital demodulator for the millimeter wave communication machine based on the soft radio theory.
本文利用软件无线电的思想为毫米波保密通信机设计了一个全数字的调制解调器。
3
Digital and analog systems need an interpreter in order to understand each other. and that's where the modem (short for ModulatorDEModulator) comes.