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在偏僻山区的水利水文数据采集中,短波数据传输由于设备简单、传输距离远、不需中继等优点而得到日益的重视和研究。但由于短波信道是一典型的时变色散信道,多径衰落传输、多普勒频率色散、脉冲干扰和背景噪声等严重影响数据传输的可靠性。本文研究并发现了一种短波中速调制解调器(HF MODEM),在300HZ——2700HZ的短波带内实现300bit/see——1200bit/sec速率的数据传输,以解决偏僻山区的数据传输问题。
In the collection of hydrological and hydrological data in remote mountainous areas, shortwave data transmission receives more and more attention and research due to the advantages of simple equipment, long transmission distance and no need of relaying. However, short-wave channel is a typical time-varying dispersion channel, multipath fading transmission, Doppler frequency dispersion, impulse interference and background noise seriously affect the reliability of data transmission. This paper studies and finds out a short - wave modems (HF MODEM) that can realize the data transmission of 300bit / see - 1200bit / sec in the short band of 300HZ - 2700HZ to solve the problem of data transmission in remote mountainous areas.