多相编码雷达信号参数快速估计方法

针对Wigner-Ville分布、Radon-Wigner变换估计多相编码雷达信号参数存在运算量大、估计精度低等问题,本文提出了基于Radon-ambiguity变换和分数阶傅里叶变换(FRFT)联合分析的参数快速估计方法。该方法采用Radon-ambiguity变换估计信号调制斜率,采用分数阶傅里叶变换估计载频、周期等,通过两次一维搜索峰值来估计信号的参数,与Wigner变换、Radon-Wigner变换的二维搜索峰值相比,运算量大大降低,且提高了参数估计精度。仿真结果证明了该方法的有效性。

Fast Parameters Estimation Approach of PolyPhase Coded Signal

Polyphase coded radar signal parameter estimation based on Wigner-Ville distribution （WVD） and Radon-Wigner transform （RWT） has disadvantages of high computation load and low estimation accuracy. A fast parameters estimation approach based on Radon-ambiguity transform and fractional Fourier transform （FRFT） is proposed. To estimate signal modulation slope through Radon-ambiguity transform; and to estimate carrier frequency and period through FRFT, thereby signal parameters estimation can be achieved through twice one-dimension searching peak. Comparing with two-dimension searching peak of Wigner transform and Radon-Wigner transform, computation load of the algorithm presented is reduced significantly and parameter estimation accuracy gets improved. Simulation results show that this approach is effective.