修正离散Chirp-Fourier变换及其在SAR运动目标检测中的应用  

Modified Discrete Chirp-Fourier Transform and Its Application to SAR Moving Target Detection

作　　者：孙泓波[1] 郭欣[1] 顾红[1] 苏卫民[1] 刘国岁[1] 

机构地区：[1]南京理工大学电子工程技术研究中心,江苏南京210094

出　　处：《电子学报》2003年第1期25-28,共4页Acta Electronica Sinica

基　　金：雷达信号处理国防科技重点实验室基金 (No 99JS0 1 4 1 DZ2 4 0 1 )

摘　　要：离散Chirp Fourier变换 (DCFT)是最新提出的一种检测线性调频信号的有力技术 ,但它对信号的采样点数和信号参数有着近乎苛刻的约束条件 ,限制了它的工程应用 .本文对DCFT的定义进行了修正 ,它不附带任何约束条件 ,是一种优越而又实用的线性调频信号检测技术 .本文将其用于机载合成孔径雷达 (SAR)运动目标检测当中 ,取得了良好的效果 .此外 ,本文又提出了基于CLEAN思想的检测技术 ,与修正DCFT相结合 ,可以有效地检测出被强目标掩盖的弱目标 ,具有很大的实用价值 .仿真的结果验证了算法的有效性 .The Discrete Chirp-Fourier Transform (DCFT) proposed recently is an effective technique for chirp signal detection. But it requires some rigorous restrictions on the signal length and parameters. These requirements restrict the application of DCFT. In this paper, the definition of DCFT is modified. No restrictions are included in this new definition. It is an excellent and practical technique for the detection of chirp signal. The modified DCFT is applied to airborne SAR moving target detection and good results are achieved. In addition, a new CLEAN technique combined with the modified DCFT is proposed to detect the small targets submerged by the large ones effectively. The simulation results prove its validity.

关 键 词：SAR 离散CHIRP-FOURIER变换 线性调频信号 合成孔径雷达 运动目标检测 DCFT 

分 类 号：TN958[电子电信—信号与信息处理] TN957.51[电子电信—信息与通信工程]