基于信号模糊域自适应核分布的进一步分析  

Further study of the adaptive kernel distribution based on signals ambiguity domain

作　　者：邹虹[1] 保铮[1] 

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,陕西西安710071

出　　处：《西安电子科技大学学报》1999年第6期713-717,共5页Journal of Xidian University

基　　金：国家自然科学基金

摘　　要：对于线性调频信号，根据其在模糊域上的结构自适应设计核函数，能够更好地抑制信号时频分布中出现的交叉项，并保持较高的信号聚集度．然而，这种核设计思想还只是基于信号模糊域的一种直观想法．究竟自适应核函数对信号各自身项及交叉项是如何作用的，它是如何提高时频分布质量的，核参数估计准确与否对时频分布的影响如何呢？ 文中以自适应高斯核分布为例，对这一系列问题进行了深入分析．在此基础上，从已有的几种基于模糊域自适应核设计方法出发，总结了基于模糊域自适应设计核函数的一般方法，并以仿真结果做了说明．这样，有利于对各种不同形式的核函数的性能进行优劣比较。It has been known that, for multiple Linear Frequency Modulated (LFM) signals, a clearer time frequency distribution (TFD) can be obtained if the kernel is adaptively designed based on the structure of the signals ambiguity function (AF). But until now, no analysis has been made of problems of how the adaptive kernel works on the signal terms and cross terms and improves the TFD quality and how the kernel parameters affect the TFD. With the adaptive Gaussian kernel Distribution as an example, these problems are discussed in detail in this paper. Furthermore, a common adaptive kernel design method based on ambiguity domain is generalized, which is beneficial to the property comparison of kernels with different forms and to the selection of the most appropriate kernel.

关 键 词：模糊函数 时频分布 雷达 信号处理 

分 类 号：TN957.52[电子电信—信号与信息处理]