定向红外对抗系统干扰性能研究

Study on jamming performance of DIRCM

立足于定向红外对抗系统(DIRCM)的干扰性能的研究,将目标导引头红外焦平面功率密度和系统持续照射目标时的照射容差角作为评价定向红外对抗系统干扰性能的两个指标。综合考虑大气传输透过率和光束传输过程中光束自身衍射效应与大气湍流效应引起的光束发散角对目标导引头接收功率的影响,建立了定向红外干扰模型,模拟了定向红外对抗系统照射光束在目标导引头红外焦平面上的功率密度。利用概率论置信区间的概念,将目标中心相对于光束中心的距离偏离量转化为角量与光束发散角进行对比,建立了定向红外对抗系统的照射容差角模型。通过仿真,定量分析了照射距离、大气湍流强度、光束出射口径对目标导引头红外焦平面的功率密度和系统照射容差角的影响。

The jamming performance of DIRCMis studied,and the power density on the target′s IRFPA（infrared focal plane array）and the tolerance angle of system′s irradiating are regarded as two indexes to evaluate the DIRCM′s jam-ming performance.Considering the influence of the diffraction effect in the atmospheric transmittance and the beam divergence angle from turbulence effect on the power density of target′s IRFPA,the jamming model of DIRCMwas es-tablished,and the power density of target′s IRFPA from DIRCM′s irradiating beam was simulated.Then the tolerance angle model of DIRCM′s irradiating was established based on the concept of confidence interval.By simulating the two models,influences of irradiating distance,turbulence intensity and beam irradiating caliber on the power density of the target′s IRFPA and the tolerance angle of system are analyzed quantitatively.