共查询到18条相似文献,搜索用时 531 毫秒
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针对加性色噪声和乘性色噪声联合干扰下的雷达运动目标检测问题进行了研究.首先利用循环平稳信号处理原理,分析了加性噪声和乘性噪声联合干扰下的复调频信号的循环统计特性,在此基础上构造了基于二阶循环矩的检测统计量,推导了检测统计量的输出信噪比与观测噪声统计特性的关系.最后利用Monte-Carlo仿真试验得到检测性能的曲线,并与基于时频分布的Wigner-Hough检测器做了比较,仿真试验进一步验证了本文提出的二阶循环矩检测器性能要优于Wigner-Hough检测器. 相似文献
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噪声中的谐波恢复问题是信号处理领域的一个典型问题,在众多领域中有着广泛的应用。本文主要研究零均值乘性和加性噪声并存下的二维谐波信号频率估计问题,提出了一种基于数据矩阵的奇异值分解和子空间的旋转不变性的零均值乘性和加性噪声中的谐波频率的估计方法。乘性噪声为零均值情形下传统的估计方法往往难以直接应用或估计失效。本文利用谐波模型信号特征,通过对观测信号进行平方运算构造了一个数据矩阵。通过对数据矩阵的特征值进行理论分析,结合子空间旋转不变性,得到了零均值乘性和加性噪声中的谐波频率和数据矩阵之间的一种内在关系。这个性质可以用于零均值乘性和加性噪声并存下的二维谐波信号频率估计,并且所得的二维频率能自动配对。仿真实验验证了本文所提算法的有效性。 相似文献
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WANG Fei WANG Shu-xun WU Yong-guiInstitution of Communication Engineering Jilin University Changchun P.R.China 《中国邮电高校学报(英文版)》2005,12(3)
1 Introduction In many applications ,such as radar ,sonar and com-munication, parameters esti mation of two di mensionalharmonics was veryi mportant .In order to get highres-olutions esti mation, many subspace methods of one di-mensional harmonics , such as MUSIC, MEMP,ES-PRIT, have been developed to esti mate parameters oftwo di mensional harmonics[1 ~3]. When additive noise was colored Gaussian noiseH.M.ibrahi m[4]and R. R. Gharieb[5]analyzed thisproblem with high-order cumulants sin… 相似文献
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本文利用特殊四阶时间平均多矩谱对任意均值乘性噪声与任意均值加性噪声共存,并且乘性噪声之间相关、乘性噪声与加性噪声之间相互独立的噪声背景下的三次非线性耦合进行了分析,该方法能够有效地估计出观测信号中参于三次非线性耦合的频率和耦合产生的频率.并且该方法无需限制乘性噪声与加性噪声的颜色和分布.最后,文中把此方法拓广到二维,用此二维四阶时间平均多矩谱方法分析了二维三次非线性耦合问题,同样取得了良好的效果.仿真实验验证了文中结论. 相似文献
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Nonequilibrium Phenomena in Globally Coupled Active Rotators with Multiplicative and Additive Noises
We investigate noise-induced phase transitions in globally coupled active rotators with multiplicative and additive noises. In the system there are four phases, stationary one-cluster, stationary two-cluster, moving one-cluster, and moving two-cluster phases. It is shown that multiplicative noise induces a bifurcation from one-cluster phase to two-cluster phase. Pinning force also induces a bifurcation from moving phase to stationary phase suppressing the multiplicative noise effect. Additive noise reduces both effects of multiplicative noise and pinning force urging the system to the stationary one-cluster phase. The frustrated effects of pinning force and additive and multiplicative noises lead to a reentrant transition at intermediate additive noise intensity. Nature of the transition is also discussed. 相似文献
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More methods can be used to remove the additive noise, such as the Mean of Least Variance (MLV) filter. When the signal is noised by the multiplicative noise, it is difficult to remove. The paper presents an improved filter to remove multiplicative noise by changing the multiplicative noise to the additive noise, and then using the MLV-like to remove the additive noise. The simulation results show that the performance is better than Minimum Coefficient of Variation (MCV) filter and MLV filter. Both one-dimension and image experiments demonstrate its theoretical performance. 相似文献
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In this paper, a simulation model of bistable system subject to multiplicative and additive noise is built on the basis of the theory of stochastic resonance(SR). SR phenomenon appears in the system subject to multiplicative and additive noise when a single signal transmits in the system. The output waveforms and the power spectrums at different frequencies are compared. The impact of the intensity of multiplicative and additive noise on the bistable system is discussed. It is found that this simulation model can upgrade the quality of the signal processing and the noise intensity can be effectively used for improving the effect of SR. 相似文献