基于匹配傅里叶变换舰船回波参数估计方法研究  

Estimating parameters of ship's echoes using matching Fourier transform

作　　者：张云[1,2] 姜义成[1] 

机构地区：[1]哈尔滨工业大学电子工程技术研究所,黑龙江哈尔滨150001 [2]哈尔滨工业大学光电测控技术与装备研究所,黑龙江哈尔滨150001

出　　处：《哈尔滨工程大学学报》2009年第4期447-450,共4页Journal of Harbin Engineering University

基　　金：国家自然科学基金资助项目(60872100);国家863课题基金资助项目(2006AA12Z313)

摘　　要：针对ISAR对非合作机动舰船目标的成像问题,将回波作多分量线性调频信号近似.依据匹配傅里叶变换理论,分析基于匹配傅里叶变换的多分量线性调频信号参数估计的统计特性.研究表明幅值、初始频率和调频率3个参量估计的均方误差均接近Cramer-Rao下界,通过蒙特卡罗仿真实验验证了理论推导的正确性.采用匹配傅里叶变换进行舰船目标回波多普勒参数估计,利用运动补偿完成瞬时成像,获得不同时刻的目标像及目标的运动姿态,实测数据验证方法的有效性.To improve the inverse synthetic aperture radar （ISAR） imaging quality with maneuvering un-cooperative ships, echoes were regarded as multi-components of linear frequency modulated （LFM） signals. The matching Fourier transform is a new technique for parameter estimation of LFM signals. Based on the principle of matching Fourier transforms, asymptotic statistical results were derived for the parameters estimated in this paper. The mean- squared error of the amplitude, initial frequency and frequency modulation rates approached the low bound of the Monte Carlo simulation. These Monte Carlo results supported the theoretical results. Finally, Doppler parameters of the ships were accurately estimated to get high resolution instantaneous images, deriving both shape and position. Raw data results verified this approach.

关 键 词：匹配傅里叶变换 线性调频信号 统计特性 机动目标 

分 类 号：TN957[电子电信—信号与信息处理]