基于小波变换的多普勒雷达回波图像压缩  

Image Compression of Doppler Radar Signal Based on Wavelet Transform

作　　者：陈威[1] 李凤昌[1] 严卫[1] 

机构地区：[1]解放军理工大学气象学院,江苏南京211101

出　　处：《解放军理工大学学报（自然科学版）》2003年第4期93-97,共5页Journal of PLA University of Science and Technology(Natural Science Edition)

摘　　要：由于多普勒雷达的速度图是矢量场 ,在有损压缩模式下 ,运动粒子的原来运动方向可能会由于失真而改变。提出了一种速度场方向保持算法 ( VFHOA) ,引入了方向图的概念。在恢复图像时 ,利用该算法 ,可以纠正发生方向错误的运动粒子。最后利用小波变换和零树编码 ,并结合 VFHOA对多普勒雷达回波数据进行了压缩。实验表明 ,VFHOA实现简单 ,效果较好 ;并且该算法也适用于对一般的矢量场图像的有损压缩。Under the lossy compression, the moving target (cloud, raindrop etc.) may shift its quondam orientation because of the distortion. This is because the velocity field of Doppler radar is a vector field. In this paper, in order to resolve the problem, a novel algorithm named velocity field holding orientation algorithm (VFHOA) is proposed by the orientation image. The echo data is compressed using VFHOA based on the wavelets and the zerotree coding. The results show that the particle, which shifts its orientation, will be corrected. VFHOA may be used in other vector field under lossy compression. It is very simple and efficient.

关 键 词：有损压缩 多普勒雷达回波图像 速度场方向保持算法 小波变换 零树编码 

分 类 号：TN911.7[电子电信—通信与信息系统]