基于AF的多相编码脉冲脉内调制参数估计

雷达信号脉内调制参数估计是电子对抗领域的一个重要问题。推导了P4编码脉冲信号模糊函数(ambiguity function, AF)的表达式，得出AF幅度图像上距离主脊线最近的脊线在时延轴和多普勒轴上截距分别等于编码时长和子码率这一结论。采用RAT(Radon ambiguity transform)和图像Radon变换估计信号参数，采用三次多项式插值方法提高估计精度。分析了估计方法应用于不同码型编码脉冲信号的输出信噪比，理论分析和仿真结果都说明,估计算法对P3和Frank编码脉冲比P1、P2和P4有更好的估计性能。

Parameter estimation of intra-pulse modulation for poly-phase coded pulse based on AF

The parameter estimation of intra-pulse modulation of radar signals is one of the main topics in electronic countermeasures. A conclusion that the intercepts on the delay and Doppler axis are the duration of coded pulse and sub-pulse rate, respectively, for P4 coded pulse signal by deriving the analytical expression of its ambiguity function (AF) is obtained. The RAT and Radon transform are used to estimate the parameters of the coded signal. The cubic data interpolation method is utilized to improve the accuracy. The output signal-to-noise-rate is analyzed for five types of codes. The theoretical analysis and simulation results show that the performance of the algorithm is better for P3 and Frank than P1, P2 and P4.