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Polyphase coded low probability of intercept signals detection and estimation using time–frequency rate distribution

机译:使用时频比分布的多相编码低概率侦听信号检测和估计

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摘要

Polyphase codes including Frank, P1, P2, P3 and P4 codes are different from linear frequency modulation (LFM) and conventional phase coding, which have brought great challenges to current reconnaissance systems. Polyphase codes are derived from approximation to LFM waveforms. By theoretical derivation and simulation analysis, the authors can conclude that time-frequency rate (TFR) distribution is much more suitable for detection and estimation of polyphase coded signals than time-frequency distribution. Based on the transformation of TFR distribution, a hierarchical signal detection scheme and a peak slice-based parameter estimation method are proposed for polyphase coded signals. To improve the energy concentration, two higher order TFR distributions are presented as a supplement and comparison. The theoretical analysis and simulation experiments demonstrate the validity and efficiency of the proposed method.
机译:包括Frank,P1,P2,P3和P4码的多相码不同于线性调频(LFM)和常规相位编码,这给当前的侦察系统带来了巨大挑战。多相代码是从LFM波形的近似值导出的。通过理论推导和仿真分析,作者可以得出结论,时频率(TFR)分布比时频分布更适合于多相编码信号的检测和估计。基于TFR分布的变换,提出了一种多相编码信号的分层信号检测方案和基于峰切片的参数估计方法。为了提高能量集中度,提出了两个较高阶的TFR分布作为补充和比较。理论分析和仿真实验证明了该方法的有效性和有效性。

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