论文部分内容阅读
一、短波通信在军事通信中的地位短波通信由于所依赖的电离层反射信道为一变参信道(即信道衰减随时间而变、信道传输延迟时间随时间而变和多径传播),以及在这个频段上因用户越来越多所造成的严重干扰,使其通信质量和可靠性远较其它信道为差。但是,由于它具有简单、经济、电路建立和拆除容易、机动性好、抗毁力强、以及以较小的功率(不需要转接)即可进行远距离通信等优点,致使短波通信一直是我军无线电通信的支柱。近年来出现了卫星通信,由于其通信质
I. The Position of Shortwave Communication in Military Communications Shortwave communications rely on the ionospheric reflection channel as a variant channel (ie, the channel attenuation changes with time, the channel transmission delay varies with time and multipath propagation) The serious interference caused by more and more users in this frequency band makes the communication quality and reliability far worse than other channels. However, because of its simplicity, economy, ease of circuit setup and disassembly, good maneuverability, strong anti-destruction capability, and the ability to communicate over long distances with less power (no need for switching), shortwave communications have been The backbone of our military radio communications. Satellite communications have emerged in recent years due to their communications quality