甚高频(VHF),超高频(UHF)通信广泛应用于广播、航空移动和导航等业务中,如何根据不同的业务种类确定其可达距离是实际应用中重要环节。目前,人们对VHF,UHF场强预测有了很深入的研究,但是对完整的VHF,UHF收发系统及噪声影响下的可达距离分析较少,这使得人们在需要预测可达距离时,往往根据经验进行判断,误差较大且不具备实时性。提供了完整系统,根据国际电联(ITU)建议书,预测场强和信噪比,对比相应业务种类,进而得到相应距离上是否可达的预测结果。 VHF and UHF communications are widely used in broadcasting, aeronautical mobile and navigation services. How to determine the reachable distance according to different service types is an important practical application. At present, people have done a thorough research on the prediction of the field strength of VHF and UHF, but the analysis of the reachable distance under the influence of intact VHF, UHF transceiver system and noise makes people often need to predict the reachable distance, often According to experience to judge, the error is larger and does not have real-time. A complete system is provided to compare the corresponding service categories based on the ITU recommendations, predicted field strength and signal-to-noise ratio to arrive at predictions of reachable distances.