电波频率对射频隐身性能的影响分析

Analysis of influence of radio frequency on RF stealth

针对新一代军用飞机对射频隐身能力的迫切需求,研究了电波频率对射频隐身性能的影响。首先基于截获距离给出了隐身效率的定义。然后综合考虑自由空间衰减、大气吸收衰减和降雨衰减的影响,对截获距离与电波频率之间的关系进行了分析。最后仿真了10～40GHz之间,不同工作距离和天气环境下,频率改变对射频隐身性能的影响。结果表明,频率选择对射频隐身性能具有很大影响,在10～40GHz内通过频率改变能够提高约10%的隐身效率,同时工作距离和天气条件对隐身性能也会产生一定的影响。

Radio frequency （RF） stealth is one of the most important properties of the new generation military aircraft, and the influence of radio frequency on RF stealth is analysed. A definition of stealth efficiency is given based on acquisition range. Considering the influences of free space attenuation, atmospheric absorption and rainfall attenuation synthetically, the relationship between acquisition range and radio frequency is discussed, and the calculating method is given. In consideration of different operating ranges and different weather conditions, the influence of radio frequency change on RF stealth performance is simulated in the 10-40 GHz frequency band. The result shows that, in the 10-40 GHz frequency band, radio frequency has a great influence on the performance of RF stealth, the stealth efficiency can increase by about 10% by selecting the optimum frequency, at the same time, and the operating range and weather condition can also affect the perform- ance of RF stealth to a certain extent.