基于HAF估计的超宽带LFM信号距离像频域校正  

Range Profile Correction in Frequency-domain Based on HAF for Ultrawideband LFM Signal

作　　者：曹馨方 尹治平[1] 孙双元 CAO Xinfang;YIN Zhiping;SUN Shuangyuan(Academy of Photoletic Technology,Hefei University of Technology,Hefei 230001,China)

机构地区：[1]合肥工业大学光电研究院,合肥230001

出　　处：《现代雷达》2020年第2期42-47,53,共7页Modern Radar

摘　　要：为更准确且简洁地表达超宽带的线性调频(LFM)信号的非线性相位,文中采用一种高阶模糊函数,而不是经典的泰勒展开来表达非线性相位多项式,并用高阶模糊函数(HAF)法估计非线性相位多项式系数。针对因目标延时不同导致的非线性程度不同的问题,采用了一种频域校正法补偿回波的非线性相位,一次性完成不同距离目标的一维距离像聚焦,无需对不同距离目标分别进行校正处理,算法效率大大提高。In order to express the non-linearity of ultrawideband linear frequency modulation(LFM) signal more accurately and concisely,a polynomial expression based on higher-order ambiguity function(HAF) rather than classical Taylor expansion is used to express the nonlinear phase polynomial,and the HAF method is used to estimate the parameters of the non-linear phase polynomial coefficients. In order to solve the problem of different degree of nonlinearity caused by different target delay,a frequency domain correction method is used to compensate the non-linear phase,and one-dimensional range profile of different range targets is refocused at one time. Different range targets don’t need to be corrected separately,so the efficiency of the algorithm is greatly improved.

关 键 词：非线性相位参数估计 高阶模糊函数 线性调频信号 非线性校正 

分 类 号：TN957.51[电子电信—信号与信息处理]