基于可见性和信号时长的SAR卫星动态威胁分析

Dynamic Threat Analysis of SAR Satellite Based on Visibility and Signal Duration

针对电子对抗领域缺乏合成孔径雷达(Synthetic Aperture Radar,SAR)卫星动态威胁评估方法的问题,根据SAR卫星对地面目标的可见性以及侦察装备能力边界,结合信号出现时长,建立SAR卫星动态威胁分析模型。首先根据两行轨道数据(Two-Line Orbital Element,TLE)外推卫星轨道,然后计算满足卫星波束视场和装备能力指标的威胁窗口,最后根据威胁窗口和信号出现时长计算动态威胁等级。采用4颗SAR卫星的TLE数据,在5个任务规划时段进行动态威胁度计算仿真。仿真及应用结果表明,该方法可以给出合理、有效的动态威胁度等级,能够为打击目标的选取提供依据,为作战指挥决策提供支撑。

Aming at the lack of synthetic aperture radar(SAR)satellite dynamic threat assessment method in the field of electronic countermeasure,the dynamic threat analysis model of SAR satellite is established according to the visibility of SAR satellite to ground targets and the capability boundary of reconnaissance equipment,combined with the signal occurrence time.Firstly,the satellite orbit is extrapolated according to two-line orbital element(TLE).Then the threat window is calculated that meets the satellite beam field of view and equipment capability boundary.Finally,the dynamic threat level is calculated according to the threat window and signal duration.The TLE data of four SAR satellites are used to calculate and simulate the dynamic threat degree in five mission planning periods.Simulation and application results show that this method can provide a reasonale and effective dynamic threat level.A basis for the selection of strike targets is provided and the battle command decision is supported.