冲激噪声环境中LFM信号的特征参数估计  

Estimation of LFM Signal’s Time Parameters under Impulsive Noise

作　　者：李立萍[1] 钟璠[1] 文忠[1] 

机构地区：[1]电子科技大学电子工程学院,成都6100054

出　　处：《电子科技大学学报》2005年第6期729-731,746,共4页Journal of University of Electronic Science and Technology of China

摘　　要：SαS稳定分布是一类非常重要的非高斯随机分布,具有这类分布的噪声称为冲激噪声。在冲激噪声情况下,α阶以上的矩均不存在,导致基于二阶矩的高斯模型算法性能下降,甚至不能正常工作。该文提出了一种在冲激噪声环境下线性调频信号特征参数估计的算法,通过分析冲激噪声的具体特点,给出了修正的低阶矩模糊函数,并结合Radon变换估计了冲激噪声环境下LFM信号的参数。该算法既可应用于冲激噪声下,又可应用于高斯噪声环境,故具有较好的鲁棒性。最后用计算机仿真验证了该算法的有效性。In this paper, an algorithm is proposed to estimate the Linear Frequency-Modulated （LFM） signal＇s parameters under non-gauss noise condition. By analyzing the characteristics of impulse noise, a modified lower-order-moments ambiguity function is presented, which can analyze the timefrequency trait even under the impulse noise condition. Moreover, the proposed method combines the Radon transform to estimate the LFM signal＇s parameters, which can suppress noise further. This approach can be applied in the impulse noise case or in the gauss noise case, hence it possesses the better robust property than the conventional methods. At last, the performance of the proposed scheme is compared with the conventional method, and the computer simulation results show the effectiveness of the new method.

关 键 词：冲激噪声 特征参数估计 线性调频 低阶矩 

分 类 号：TN911.23[电子电信—通信与信息系统]