一种小擦地角下空时相关的海杂波仿真模型  

A Model for Spatially and Temporally Correlated Low Grazing Angle Sea Clutter Simulation

作　　者：王佳宁[1] 许小剑[1] 

机构地区：[1]北京航空航天大学,北京100191

出　　处：《制导与引信》2014年第4期7-13,共7页Guidance & Fuze

摘　　要：提出一种距离和时间二维相关的复海杂波序列生成模型。该模型利用记忆非线性变换(MNLT)生成海杂波高分辨率距离像(HRRP),其满足空间-时间二维相关特性,且幅度服从Pareto分布;随后依据多普勒频率与HRRP幅度的近似线性关系,生成各个距离分辨单元中杂波序列的多普勒谱;最终利用交替投影(AP)算法反演出海杂波复散射信号的相位信息,从而得到符合特定统计特性和空间时间相关特性的二维复海杂波序列。仿真结果表明,本文提出的海杂波生成模型可有效生成幅度服从Pareto分布,距离和时间上相关,且各个距离单元内时间相关特性与相应单元内海杂波强度有关的海杂波序列。This paper proposes a model for simulation of the temporally and spatially correlated low grazing angle sea clutter based on the statistical and correlated characteristics. Firstly, the memoryless nonlinear transform （MNLT） is adopted to directly simulate the Pareto distributed high resolution range profiles （HRRPs） of the temporally and spatially correlated sea clutter from coherent pulses. Secondly, by utilizing the approximately linear relationship between the Doppler central frequency and HRRP range Doppler spectrum of each range bin is modeled. Then, the alternating projection （AP） approach is used to retrieve phases of sea clutter with the desired Doppler spectrum and the given magnitudes. Simulation results show that the proposed model can generate the Pareto distributed temporally and spatially correlated sea clutter with desired spatial correlation function and range resolved Doppler spectra.

关 键 词：空时相关 小擦地角 PARETO分布 多普勒谱 海杂波 

分 类 号：TN011[电子电信—物理电子学]