瞬时测频(instantaneous frequency measurement,IFM)接收机具有截获概率高、瞬时带宽大、分辨率高等优点,被广泛应用于雷达告警、雷达侦察等电子对抗设备。因此对IFM接收机的干扰能有效提高雷达的生存概率。给出了IFM接收机的结构,分...瞬时测频(instantaneous frequency measurement,IFM)接收机具有截获概率高、瞬时带宽大、分辨率高等优点,被广泛应用于雷达告警、雷达侦察等电子对抗设备。因此对IFM接收机的干扰能有效提高雷达的生存概率。给出了IFM接收机的结构,分析了同时到达信号对IFM接收机测频的影响,最后提出了使用连续波射频掩护信号干扰IFM接收机测频工作的方法,并且在SyetemVue平台上对该方法进行了仿真实现,仿真结果验证了方法的有效性和不同条件下连续波掩护信号对IFM接收机的干扰效果。展开更多
A generalized approach for narrowband interference （NBI） suppression in direct sequence spread spectrum （DSSS） communication systems using adaptive infinite impulse response （IIR） filter is presented. The excisi...A generalized approach for narrowband interference （NBI） suppression in direct sequence spread spectrum （DSSS） communication systems using adaptive infinite impulse response （IIR） filter is presented. The excision filter coefficients depend on both the jammer power and its instantaneous frequency. The dependency of the filter construction on the jammer power is significant as it allows optimal tradeoff between interference removal and signal distortion by maximizing the receiver signal to noise ratio improvement（SNRI）. Instead of traditional adaptive line enhancer （ALE） estimator, a preferable NBI estimator-Fourier interpolation estimator （FIE） is proposed. Closed-form expressions of the SNR improvement and theoretical bit error rate （BER） based on the assumption that the output of the correlator is Gaussian distributed are both derived. Performance results obtained by numerical simulation are also presented and compared with theoretical results.展开更多
文摘瞬时测频(instantaneous frequency measurement,IFM)接收机具有截获概率高、瞬时带宽大、分辨率高等优点,被广泛应用于雷达告警、雷达侦察等电子对抗设备。因此对IFM接收机的干扰能有效提高雷达的生存概率。给出了IFM接收机的结构,分析了同时到达信号对IFM接收机测频的影响,最后提出了使用连续波射频掩护信号干扰IFM接收机测频工作的方法,并且在SyetemVue平台上对该方法进行了仿真实现,仿真结果验证了方法的有效性和不同条件下连续波掩护信号对IFM接收机的干扰效果。
基金Sponsored by the Beijing Municipal Natural Science Foundation(4052024)
文摘A generalized approach for narrowband interference （NBI） suppression in direct sequence spread spectrum （DSSS） communication systems using adaptive infinite impulse response （IIR） filter is presented. The excision filter coefficients depend on both the jammer power and its instantaneous frequency. The dependency of the filter construction on the jammer power is significant as it allows optimal tradeoff between interference removal and signal distortion by maximizing the receiver signal to noise ratio improvement（SNRI）. Instead of traditional adaptive line enhancer （ALE） estimator, a preferable NBI estimator-Fourier interpolation estimator （FIE） is proposed. Closed-form expressions of the SNR improvement and theoretical bit error rate （BER） based on the assumption that the output of the correlator is Gaussian distributed are both derived. Performance results obtained by numerical simulation are also presented and compared with theoretical results.
