一种基于最小熵准则的鸟类目标ISAR成像新方法  

A Novel Method for ISAR Imaging of Bird Based on Minimum Entropy Criterion

作　　者：朱丰[1] 冯有前[1] 罗迎[2] 何元桥[2] 张群[2] 

机构地区：[1]空军工程大学理学院,陕西西安710051 [2]空军工程大学电讯工程学院,陕西西安710077

出　　处：《通信技术》2008年第8期198-200,共3页Communications Technology

基　　金：国家自然科学基金(No.60672032);陕西省自然科学基础研究项目(No.2007F28)

摘　　要：用线性调频步进体制高分辨雷达对鸟类目标进行ISAR成像是一个全新且重要的技术途径。鸟类目标振动翅膀带来严重的微多普勒效应,直接利用距离-多普勒成像算法效果欠佳。在分析了线性调频步进体制ISAR成像原理的基础上,提出了一种基于最小波形熵准则的谱图拼接成像方法,明显改善了鸟类目标成像效果。仿真结果证明了其可行性和有效性。It is a novel and vital approach of bird monitoring to get the images of birds by ISAR with high-resolution radar of frequency-stepped chirp, which is quite significant for security and development of human aviation. The serious micro-Doppler effects generated by birds＇ flapping deteriorate the imaging quality via classical range-Doppler method. Based on the principle of producing micro-Doppler effects with the frequency-stepped chirp radar, a novel spectrogram join-togegher imaging method for birds based on minimum waveform entropy criterion is proposed, which can improve imaging quality obviously. Simulation results have proved the feasibility and effectiveness of the method.

关 键 词：鸟类目标 线性调频步进信号 距离-慢时间谱图 最小熵准则 

分 类 号：TN958[电子电信—信号与信息处理]