王陶然,庞晨,祝迪,等. 线性调频雷达信号的拉伸变换干扰及特性研究[J]. 电波科学学报,xxxx,x(x): x-xx. DOI: 10.12265/j.cjors.2024053
      引用本文: 王陶然,庞晨,祝迪,等. 线性调频雷达信号的拉伸变换干扰及特性研究[J]. 电波科学学报,xxxx,x(x): x-xx. DOI: 10.12265/j.cjors.2024053
      WANG T R, PANG C, ZHU D, et al. Stretching transform jamming and characteristics of linear frequency modulation radar signal[J]. Chinese journal of radio science,xxxx,x(x): x-xx. (in Chinese). DOI: 10.12265/j.cjors.2024053
      Citation: WANG T R, PANG C, ZHU D, et al. Stretching transform jamming and characteristics of linear frequency modulation radar signal[J]. Chinese journal of radio science,xxxx,x(x): x-xx. (in Chinese). DOI: 10.12265/j.cjors.2024053

      线性调频雷达信号的拉伸变换干扰及特性研究

      Stretching transform jamming and characteristics of linear frequency modulation radar signal

      • 摘要: 随着数字射频存储器(digital ratio frequency memory, DRFM)的成熟发展与广泛应用,基于DRFM的相干转发干扰成为当前雷达干扰技术的主流。相干转发干扰具有转发效率高、相干性强等突出优势,并且在数字域的处理算法灵活高效,能够产生复杂多样的干扰效果。但经过大量实践发现,当需要产生大范围连片干扰效果时,若干扰机采用密集转发,不但使DRFM运算量急剧增加,而且会破坏恒模约束,导致干扰机功放效率严重下降。基于该情况,本文提出了线性调频(linear frequency modulated pulses,LFM)雷达信号的拉伸变换干扰方法,在数字域对雷达信号的脉宽、带宽分别压缩、展宽,即拉伸变换,再将其辐射至雷达接收机。拉伸信号经匹配滤波处理后,会呈现大范围连片相干干扰效果,干扰效果受拉伸变换因子影响,灵活可调,且拉伸变换干扰满足恒模约束。

         

        Abstract: With the mature development and wide application of digital ratio frequency memory (DRFM), DRFM-based coherent forwarding jamming has become the mainstream of radar jamming technology. Coherent forwarding jamming has the outstanding advantages of high forwarding efficiency and strong coherence, and the processing algorithm in the digital domain is flexible and efficient, which can produce complex and diverse jamming effects. However, after a lot of practice, it is found that when it is necessary to produce a large-scale continuous interference effect, if the jammer adopts dense forwarding, it will not only increase the amount of DRFM computation sharply, but also destroy the constant mode constraint, resulting in a serious decrease in the power amplifier efficiency of the jammer. Based on this situation, this paper proposes a tensile transformation jamming method for linear frequency modulated pulses (LFM) radar signals, which compresses and broadens the pulse width and bandwidth of radar signals in the digital domain, i.e., tensile transformation, and then radiates them to the radar receiver. After the tensile signal is processed by matching filtering, it will present a large-scale continuous coherent interference effect, which is affected by the tensile transformation factor, which is flexible and adjustable, and the tensile transformation interference satisfies the constant mode constraint.

         

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