Abstract The noise immunity of radars is essentially reduced under the simultaneous exposure to active noise and passive interferences. This is stipulated by the passive interference decorrelating the active noise and also by the disruption of interperiod correlation of passive interference during the adaptation of weight coefficients of spatial filter. This paper proposes and investigates a new method of forming the classified training sample (CTS) based on the interchannel correlation analysis of range signal. This method makes it possible (in the current sounding period in terms of the maximum magnitude of interchannel correlation coefficient) to determine the range interval, within which the passive interference has the minimum level, and to form the optimal value of weight coefficient of spatial filter for its use in the next sounding period. In addition, the method allows us to form an optimal weight coefficient for compensation of active noise interference in all sounding periods of the next frequency burst during the burst-mode signal processing in the last sounding period of the current burst. The simulation process has revealed that in this case the modulation of passive interference present in compensation channel is also eliminated. It can essentially enhance the efficiency of extraction of useful signals against the background of passive interferences during the time (frequency) processing at the second stage of space-time signal filtering in radars. It has been established that the use of CTS makes it possible to significantly reduce the duration of transient during the adaptation of weight coefficients of spatial filter that enables us to enhance the efficiency of active noise suppression under the simultaneous exposure to nonstationary passive interferences.

中文翻译：

---

提高组合干扰下雷达信号时空处理的效率

摘要 在同时暴露于有源噪声和无源干扰的情况下，雷达的抗噪能力显着降低。这是由将有源噪声去相关的无源干扰以及空间滤波器权重系数自适应过程中无源干扰的周期间相关性破坏所规定的。本文提出并研究了一种基于距离信号通道间相关分析的分类训练样本(CTS)形成新方法。该方法使得（在当前探测周期内，以通道间相关系数的最大幅值而言）确定无源干扰电平最小的距离区间，并形成空间滤波器权重系数的最优值以便在下一个探测期使用。此外，该方法允许我们在当前突发的最后一个探测周期的突发模式信号处理期间形成用于补偿下一个频率突发的所有探测周期的有源噪声干扰的最优权重系数。仿真过程表明，在这种情况下，补偿信道中存在的无源干扰的调制也被消除了。它可以在雷达空时信号滤波第二阶段的时间（频率）处理过程中，在无源干扰的背景下，从本质上提高提取有用信号的效率。