文档介绍：2011-07题录英译集
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基于改进小波阈值函数的雷达信号去噪
赵松,江汉红,张朝亮,柯泽贤
(海军工程大学电气与信息工程学院,武汉 430033)
摘要:为去除雷达信号混杂的高斯白噪声,对小波阈值去噪法进行研究。通过分析软硬阈值函数和几种改进阈值函数的特点,提出了改进连续阈值函数和折衷阈值函数,并选取优化阈值进行去噪仿真。仿真结果表明:新阈值函数连续性好、便于调节,克服了硬阈值法不连续和软阈值法具有偏差的缺点。方法2效果最佳,有效提高了输出信噪比,对于雷达信号处理具有一定的应用价值。
关键词:小波变换;阈值函数;雷达信号
Radar Signal Denoising Based on Improved Wavelet Thresholding Functions
Zhao Song, Jiang Hanhong, Zhang Chaoliang, Ke Zexian
(College of Electrical & Information Engineering, Naval University of Engineering, Wuhan 430033, China)
Abstract: In order to discard the Gaussian white noise mixed in radar signal, researched conventional wavelet threshold denoising method. By anlysing the character of soft and hard thresholding functions and some improved thresholding functions, introduces two optimized functions: improved continuous thresholding function and eclectic thresholding function. It also makes a simulation with optimized threshold. The simulation results show that the new thresholding functions above are continuous and easy to adjust, which e the ings of the incontinuous hard thresholding function and the soft thresholding function with unvarying warp. The second method performs better, which enhances the signal-to-noise of output signal effectually. The work has an important applied value for radar signal processing.
Keywords: wavelet transform; thresholding function; radar signal
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巡航导弹突破要地防空群多层防线的概率模型
孙学锋1,赵彦辉1,于天顺2
(1. 海军航空工程学院指挥系,山东烟台 264001;2. 中国人民解放军92840部队,山东胶南 266400)
摘要:为解决如何计算巡航导弹的突防概率问题,建立了巡航导弹的突防概率模型。将巡航导弹的突防过程看作是在一定时间内时间空间和状态空间都离散的马尔可夫链,运用一步转移概率矩阵,计算出巡航导弹突破每一层防线后剩余情况的概率,并结合实际算例进行分析。结果表明:该模型可降低巡航导弹的突防概率,提高要地防空群的拦截概率,对提高要地安全性具有重要意义。
关键词:要地防空群;巡航导弹;马尔可夫链;突防概率模型
Probabilistic Model of Cruise Missile Breaking Through Multiplayer Defense of Air Defense Group for Strategic Points
Sun Xuefeng1, Zhao Yanhui1, Yu Tianshun