欠采样频率估计方法

基于时延和旋转不变子空间技术(ESPRIT),本文提出了一种新的欠采样宽频带信号频率的高分辨估计方法.文中,欠采样所引入的频率模糊由增加的延迟通道提供的信息加以消除,并提出了相应的频率解模糊算法.为进一步降低运算量,文中给出了该频率估计方法的简易算法,增强了方法的实用性.文末推导给出频率估计的CRLB,并通过数值仿真实验验证了本文算法的有效性.

Noncentral chi-Square Gamma Distribution Clutter Model

Traditionally,Weibull and lognormal radar clutter models are based on reasonable fits to measured clutter densities,rather than any interpretation of clutter physical mechanism.And,furthermore,they use different models.A generalized clutter model,the noncentral chi-square gamma distribution model is presented in this paper,which is based on physical laws and is capable of well matching the characters of the two distributions mentioned above.Probability distributions and power densities of the simulation results demonstrate the accuracy of the technic.