频谱监视卫星截获地基雷达信号的特性分析

An Analysis on Intercept Characteristics of Spectrum Surveillance Satellite for Ground-based Radar Signal

频谱监视卫星对地面辐射源监视时,由于卫星的高速运动,在经过地面雷达辐射区的有限时间内,截获到辐射源的信号序列与低速运动或静止的平台有所不同。基于此,建立坐标系统及卫星轨道模型,计算卫星穿越雷达单波束主瓣、旁瓣辐射区的穿越时间,主要推导了在孤立状态下截获仰角波束的概率。并对影响截获概率的因素进行了仿真分析,体现了卫星截获雷达信号的概率特性,这有助于进一步认识卫星对地面雷达信号的截获过程。

Due to the high-speed motion of the spectrum satellite, it takes a short time when satellite crosses over the radar, and then the signal pulses of radar intercepted by satellite are different from those of low-speed or static platform. Based on this fact, coordinate system and satellite orbit model are founded and the passing time when satellite crossed the single main lobe or side lobe is calculated. The intercept probability of elevation lobe is mainly deduced at the state, where there is normally only one lobe. The influencing factors about the probability were analyzed by simulation, demonstrating the probability characteristics of satellite＇s intercepting radar signal. The analysis helps to further clarify the intercept process.