摘要
介绍了一种利用首次解调信号再生本地副载波 ,并用再生副载波控制本振频率 ,从而有效地对中频带宽进行压缩的方法。该方法降低了接收机的解调门限 ,接收机使用增益为 1 5.5d B的天线就可接收到静止气象卫星的 LR- FAX云图广播。
This paper introduces a method to compress middle bandwidth effectively. It regenerates local sub carrier wave from first demodulation, then uses the local sub carrier wave to control local oscillation frequency. As the result, it will lower the receiver's demodulation threshold. With the antenna gain of 15.5dB, the broadcast of LR FAX cloudimages from geostationary meteorological satellite can be clearly received.
出处
《解放军理工大学学报（自然科学版）》
EI
2000年第5期55-57,共3页
Journal of PLA University of Science and Technology(Natural Science Edition)
关键词
频带压缩
解调门限
信号再生
bandwidth compression
demodulation threshold
signalregernate
