Airborne Silent Radio Frequency Noise Shielding
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摘要: 为了规避敌方雷达对于己方战机的探测，该文提出一种战机发射射频掩护信号的方法。针对采用恒虚警类检测器(CFAR)算法的敌方雷达，己方目标发射的一定包络的掩护信号可以提升敌方噪声估计电平，达到使己方战机针对该雷达隐身的效果的同时，避免射频掩护电磁信号被敌方电子侦察设备截获，具体包括敌方雷达信号抵达目标时间估计，敌方探测能力评估，掩护噪声包络功率设计等步骤。基于单元平均恒虚警检测器(CA-CFRA)，该文利用数值仿真分析了射频掩护包络和功率对掩护信号被截获概率及目标被探测概率的关系，表明该方法需要恰当的设计掩护包络和平衡信号功率达到更好的射频掩护效果。Abstract: To avoid the detection to own fighters from adversary’s radar, a method is proposed in this paper, under which the fighter transmits radio frequency shielding signals. If Constant False Alarm Rate (CFAR) detector is used in adversary’s radars, adversary’s noise level of radar channel is overestimated when the fighter transmits the certain envelope radio frequency shielding signals by own fighters. The effect of making own fighters invisible to the radar is achieved while radio frequency shielding signals avoid being intercepted by adversary electronic reconnaissance equipment. For these purposes, it is needed to estimate the time of arrival of the adversary’s radar signal to the fighters, evaluate the enemy’s detection capability, and design the envelope and power of the shielding noise. Based on the Cell Average-Constant False Alarm Rate (CA-CFRA) detector, numerical simulation is carried out to analyze the relationship between the radio frequency shielding envelope and the interception probability of the shielding signal and the detection probability of the target. These simulation results show that the shielding method can achieve a better radio frequency shielding effect with properly designed shielding signal envelope.
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