遥感卫星地面站主要由天馈线、伺服分系统、接收分系统、站控分系统、调制器、解调器、记录设备和快视设备等构成。
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.
本文研究脉冲编码调制(PCM)控制方式的气压位置伺服系统。
A pneumatic position servo system with pulse code modulation (PCM) is described in this paper.
阐述了常规气动伺服控制系统研究的现状，认为以PWM和PCM调制方式为主的开关伺服控制技术仍然是研究的热点。
Based on the development situations of the pneumatic servo control technique, the main research was also aimed at the PWM and PCM on-off servo control system.
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