The Impact Mechanism of Fractal Noise on PN Code Detection System

The Impact Mechanism of Fractal Noise on PN Code Detection System
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分形噪声对PN码检测系统的影响机制

DOI:
10.1142/s0219477514500175
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发表时间:
2014-06
影响因子:
1.8
通讯作者:
Zha huichang
Zha huichang
中科院分区:
工程技术4区
文献类型:
--
作者:
Xiong gang;Zhang shuning;Zha huichang

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以伪随机调相连续波雷达为例,研究了一类非平稳分形噪声对PN码检测系统,特别是信号混合和匹配滤波器的影响机理。推导了伪随机信号和分形噪声的互相关函数、功率谱函数和平均功率,并比较了白噪声对伪码检测系统的影响。分析了分形布朗模型(FBM)、多重分形(MF)模型和非平稳随机分形模型(如无限可分级联,IDC)三种海杂波模型对伪随机码检测系统的影响机制,并论证了小波域多尺度滤波方法和MF方法未能消除海杂波影响的原因。基于自然海杂波数据,对比分析了白噪声和分形噪声对检测系统的影响,表明传统的相关检测和MF分析无法有效抑制分形噪声的影响,最后提出了可能的解决方案。
Taking the pseudo-random phase modulated CW radar for example, this paper studies the impact mechanism of a class of non-stationary fractal noise on PN code detection system, especially signal mixing and matching filter. The cross correlation function, power spectrum function and average power of pseudo-random signal and fractal noise are deduced, compared with the impact of white noise on the pseudo code detection system. We analyze the impact mechanism of three kinds of sea clutter model, namely fractal Brownian model (FBM), the multifractal (MF) model and the non-stationary random fractal model (e.g., infinitely divisible cascades, IDC), on the pseudo-random code detection system, and demonstrate the reason why the multi-scale filtering method in wavelet domain and the MF methods fail to eliminate the effect of sea clutter. Based on the natural sea clutter data, we simulate and analyze the influence of white noise and fractal noise comparatively on detection system, which indicates that the effect of fractal noise cannot be inhibited effectively by the traditional correlation detection and MF analysis, and finally we put forward possible solutions.
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