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实测海杂波数据空间相关性研究 被引量:17

Spatial correlation property with measured sea clutter data
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摘要 针对海杂波背景下目标检测问题的实际需要,从幅度和谱两个层面研究了实测海杂波数据的空间相关性。幅度的空间相关性主要采用相关系数和消除趋势波动分析方法,重点研究了非相参条件下空间相关性随雷达距离分辨率、海况、采样率和积累四个因素的变化趋势,相参条件下空间相关系数实部、虚部和模值的特性以及不同海况时的长程空间相关性。谱的空间相关性采用相关系数和互相关系数进行表征,主要对单一频率成分的空间相关性、谱的质心和带宽与海杂波功率水平的互相关特性两个问题进行了研究。通过研究掌握了海杂波空间相关性的一般趋势及部分特性与雷达参数、环境参数间的依赖关系,为进一步理解海表面散射机理、优化目标检测算法以及海杂波仿真提供先验信息和理论指导。 The spatial correlation property of sea clutter amplitude and spectrum is researched with measured data according to the requirement of target detection problems under sea clutter. For the spatial correlation of amplitude,correlation coefficient and detrended fluctuation analysis methods are adopted. The research mainly concentrates on the trend of spatial correlation property with radar range resolution, sea state, sampling rate and in- tegration in non-coherent condition, the property of real part, imaginary part as well as envelope of the correlation coefficient in coherent condition, and long range spatial correlation property in different sea states. Then, correlation coefficient and cross-correlation coefficient are used to quantify the spatial correlation of spectrum. The emphasis of this part includes the correlation property of single frequency component and the cross-correlation property between centroid, bandwidth and power level. The common tendency of spatial correlation property and the dependence of part property on both radar and environment parameters are mastered through the research, which can offer as prior information and theoretical reference for further understanding of sea surface scattering mechanism, optimum design of target detection algorithm as well as sea clutter simulation.
出处 《电波科学学报》 EI CSCD 北大核心 2012年第5期943-953,1062,共12页 Chinese Journal of Radio Science
基金 国家自然科学基金资助项目(No.61002045 61179017 61201445)
关键词 海杂波 空间相关性 相关系数 消除趋势波动分析 sea clutter spatial correlation property correlation coefficient detrended fluctuation analysis
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