Abstract
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.
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