魏光辉,赵宏泽,杜雪,等. 雷达带外三阶互调伪信号干扰效应预测模型[J]. 电波科学学报,2024,39(2):1-9. DOI: 10.12265/j.cjors.2023110
      引用本文: 魏光辉,赵宏泽,杜雪,等. 雷达带外三阶互调伪信号干扰效应预测模型[J]. 电波科学学报,2024,39(2):1-9. DOI: 10.12265/j.cjors.2023110
      WEI G H, ZHAO H Z, DU X, et al. Prediction model of out-of-band third-order intermodulation pseudo-signal interference effect for radar[J]. Chinese journal of radio science,2024,39(2):1-9. (in Chinese). DOI: 10.12265/j.cjors.2023110
      Citation: WEI G H, ZHAO H Z, DU X, et al. Prediction model of out-of-band third-order intermodulation pseudo-signal interference effect for radar[J]. Chinese journal of radio science,2024,39(2):1-9. (in Chinese). DOI: 10.12265/j.cjors.2023110

      雷达带外三阶互调伪信号干扰效应预测模型

      Prediction model of out-of-band third-order intermodulation pseudo-signal interference effect for radar

      • 摘要: 为评估雷达装备的抗电磁干扰性能,从电磁辐射伪信号干扰效应机理出发,理清带外多频三阶互调信号与带内单频伪信号干扰效应贡献度之间的关联关系,引入伪信号干扰效应指数的概念,建立了三阶互调伪信号干扰效应评估模型,并基于伪信号电平值的变化规律提出了模型修正方法和效应测试预测流程。以某型步进频连续波测距雷达为研究对象,采用差模注入等效替代电磁辐射的方法对受试雷达进行带外三阶互调临界伪信号干扰效应试验,结果表明:在雷达工作中心频率两侧,辐射频偏0.2~2.2 GHz的范围内,随着辐射频偏的增大,三阶互调伪信号干扰的影响呈现先增大而后降低的规律。通过改变干扰频点、场强组合和伪信号敏感电平的方式开展试验验证,证明了三阶互调伪信号干扰模型的准确度优于2 dB,能够客观评估雷达装备三阶互调伪信号干扰。

         

        Abstract: In order to evaluate the anti-electromagnetic interference performance of radar equipment, based on the mechanism of pseudo-signal interference effect of electromagnetic radiation, the relationship between the contribution of out-of-band multi-frequency third-order intermodulation signal and in-band single-frequency pseudo-signal interference effect is clarified, and the concept of pseudo-signal interference effect index is introduced. The evaluation model of third-order intermodulation pseudo-signal interference effect is established, and the model correction method and effect test prediction process are proposed based on the change rule of pseudo-signal level value. Taking a stepped-frequency continuous wave ranging radar as the research object, the out-of-band third-order intermodulation critical pseudo-signal interference effect test of the tested radar is carried out by using the method of differential mode injection equivalent substitution of electromagnetic radiation. The results show that the influence of the third-order intermodulation pseudo-signal interference increases first and then decreases with the increase of the radiation frequency offset in the range of 0.2–2.2 GHz on both sides of the radar working center frequency. The experimental verification is carried out by changing the interference frequency point, field strength combination and pseudo-signal sensitive level. It is proved that the accuracy of the third-order intermodulation pseudo-signal interference model is better than 2 dB, which can objectively evaluate the third-order intermodulation pseudo-signal interference of radar equipment.

         

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