【摘要】 分析了多元Chirp信号在模糊域的交叉项分布特点 ,提出了一种自适应线性核时频表示方法。该方法在模糊域采用巴特沃什型核函数 ,依据信号的模糊函数自适应地选取核函数的参数。仿真实验对比了自适应线性核时频表示与其它时频表示方法的性能 ,说明本方法在提高分时频分辨力、消除交叉项 ,以及抑制噪声方面有较高的性能。理论分析和仿真实验证实了本方法的有效性。更多还原

【Abstract】 This paper analyzes the characteristics of cross-terms of multi-components chirp signal in ambiguity domain and proposes a kind of adapted linear kernel time-frequency representation This method utilizes a Butterworth kernal function in ambiguity domain and the parameters of the kernel function are adaptively selected according to the ambiguity function A comparison of the method with other time-frequency distributions shows that the adaptive linear kernel time-frequency distribution preserves high capability in improving time-frequency resolution,reducing cross terms and restraining noises Theoretical analysis and experimental results prove the validity of the method更多还原