二次雷达A/C模式解码算法仿真

Simulation of Decoding Algorithm for Mode A/C in Secondary Surveillance Radar(SSR)

为了解决二次雷达在传统的A/C模式下存在的技术缺陷,以传统的"滑窗法"处理为基础,提出了新的算法。该新算法在脉冲前沿检测时,增加了脉冲宽度、幅度处理;在框架检测时,增加了对代码的提取;在参考脉冲选择时,对参考脉冲幅度重新进行了处理;在去幻影准则时,在距离相关的基础上增加了幅度相关;在代码置信度时,采用了"最小误差"方法;在去异步干扰时,采用"5判3"的算法去掉异步干扰和剩余的幻影。仿真结果表明,即使是在高密度询问和复杂的同步窜扰及异步干扰,应答信号存在非常严重的重叠情况时,该算法都具有极高的真实应答的检测概率和极低的虚警概率。

In order to solve the technical defects of traditional mode A /C in SSR,a new algorithm is proposed based on traditional ＂sliding window method＂.In the pulse detection,pulse width is increased and amplitude is processed.In the framework detection,the extraction of the code is increased.In the reference pulse selection,the reference impulse amplitude is dealt.In the dephantom aspects,the amplitude relevancy is increased on the basis of distance relevancy.In the code confidence analyzing,the minimum error method is used.In defruit,based on the algorithm of 5 march 3,the fruit and the rest of the phantom are removed.Simulation results indicate the algorithm has extremely high real reply detection probability and extremely low false alarm probability,even if in high density inquiry and complex synchronized confusion and FRUIT,serious overlap existence in signal echo.