马一科 周利华



摘要:雷达信号的脉内特征识别对雷达侦察有重要的意义。文章基于相位差分法,在仅知道单通道实中频数据的情况下,讨论了雷达信号脉内特征识别问题,并给出了一种有效的脉内特征分析方法。针对相位编码信号,采用统计相位分布情况的思想,给出了识别相位编码信号的方法,并提出了码元宽度及编码序列的提取方法。本文所提出的脉内特征分析方法运算量小,易于工程实现,在低信噪比下有较好的区分效果。仿真结果验证了所提出方法的有效性。
关键词:脉内分析;相位编码信号;瞬时频率
A Method of Intrapulse Recognition of Phase Coded Signal
Ma YikeZhou Lihua
No.38 Research Institute of CETCAnhuiHefei China230088
Abstract:Radar signal intrapulse analysis technique is important to radar reconnaissance. Based on the principle of phase difference, the problem of intrapulse recognition of radar signals is discussed in this paper, under the condition that only the real part of intermediate frequency data is known, and an effective intrapulse recognition algorithm is proposed. By using the ideal of the statisticsof phase distribution,a method of recognizing a phase coded signal is given, and at the same time, a method of how to obtain the symbol width and the phase shift keying rule is also raised up. The proposed method is easy to implement and is effective in low SNR. Simulations are given to illustrate the effectiveness of this method.
Key words:Intrapulse analysis; Phase coded signal; Instantaneous frequency
隨著现代雷达技术的发展,各种新体制雷达不断出现。战场电磁环境的日趋复杂,推动着电子侦察技术的快速发展。近年来,雷达信号脉内特征分析技术作为电子侦察的关键技术之一,越来越引起国内外学者的广泛关注。相位编码信号广泛运用于现代雷达领域,对相位编码信号的识别与特征参数的提取,是电子侦察的重要一环。雷达信号中的相位编码信号主要包括二相编码信号、四相编码信号等。其中二相编码信号最为常用,主要码型有m序列、巴克码等;四相编码信号主要有泰勒码等。快速而又准确地获得相位编码信号的类型、特征参数,从而提供有效的作战支援,是电子侦察的重要内容。
目前,对相位编码信号的分析手段主要包括:自相关法[12]、谱相关法[3]、小波变换法[45]等。这些方法对相位编码信号都有一定的分析能力,但同时也存在各自的缺陷。……