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提出了利用地面非合作辐射源如FM广播的外辐射源机载预警雷达系统的概念。为了分析影响其性能的关键因素———信杂比的变化范围和状况,分析、仿真了典型FM广播电台的辐射方向图尤其是垂直方向图,结合FM台站、AEW接收系统和目标的空间位置关系,利用双基地雷达的信号模型,得到了信杂比-60~-110 dB的分布范围及其类似于信噪比变化的卡西尼卵形线的变化规律。
The concept of airborne early warning radar system using external non-cooperative radiation sources such as FM radio was proposed. In order to analyze the range and status of the signal to noise ratio (SNR), the radiation pattern and the vertical pattern of a typical FM radio station are analyzed and simulated. Combining the FM station, AEW receiving system and the target space Using the signal model of bistatic radar, the distribution range of signal-to-noise ratio-60 ~ -110 dB and the variation of Cassini oval line similar to the change of signal-to-noise ratio were obtained.