水文遥测自动测报系统中的调制解调技术  

Modem technology for automatic hydrologic telemetering system

作　　者：刘健[1] 杨之岭[1] 丁俊敏 

机构地区：[1]黄河水利委员会防汛自动化测报计算中心

出　　处：《水力发电》1997年第10期26-28,51,共4页Water Power

摘　　要：在水文遥测自动测报系统中，采集的水文数据常常应用超短波无线通信技术进行数字传输，因此需要进行二进制数据的调制解调工作。ＭＣ１４４１２系完全用数字方法的专用集成芯片完成数字调制的，并可解调移频键控（ＦＳＫ）信号，集调制解调于一身。其电路设计时在带通滤波器与解调器之间增加了一级锁相环（ＰＬＬ）电路、减少了码元的抖动，提高了ＦＳＫ信号的输入质量，从而大大提高了ＭＣ１４４１２解调器的解调可靠性。In the system of automatic hydrological measurement and telemetering,the collected hydrological data are often transmitted by the ultra short wave of radio communication technology so that it is necessary for the binary digit to use modem technology.In the MC14412 system,the digit is completely modulated by the special integrated chip and the FSK signals can also be demodulated.In the design of electric circuit,a phase lock link (PLL) circuit is added between the wave filter and the demodulator so that it can reduce the vibration of signal and increase the input quality of FSK signal.Thus,it can increase greatly the reliability of MC14412 demodulator.

关 键 词：调制解调 水文遥测 自动测报系统 水文预报 

分 类 号：P338.9[天文地球—水文科学]