DBS多普勒中心无模糊估计新方法  

Doppler centroid estimation without ambiguity in DBS

作　　者：左磊[1] 李明[1] 张晓伟[1] 

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,陕西西安710071

出　　处：《西安电子科技大学学报》2011年第5期165-171,共7页Journal of Xidian University

基　　金：国家部委基金资助项目(9140C0103071003);国家自然科学基金资助项目(60872137)

摘　　要：在多普勒波束锐化技术中,多普勒中心作为一个基础参数需要从数据域进行估计.现有的估计方法对脉冲重复频率有模糊,在解模糊时,由于惯导数据不准确会产生一定的误差,因此严重影响成像质量.根据机械扫描雷达天线匀速转动这一特点,从数据的方位向表达式入手,首先通过参数搜索估计出一个相干数据块的两个参数——第1个回波波束中心的方位角和载机速度与俯仰角余弦的积,然后可由这两个参数计算出相干数据块的无模糊的多普勒中心.这种方法的一切信息都是从数据域获得的,具有更广泛的适应性.Doppler centroid, a foundational parameter of Doppler Beam Sharpening （DBS）, needs to be estimated from echoes. Traditional estimated methods have a shortcoming of the ambiguity to pulse repetition frequency （PRF）. The inaccuracy of Doppler centroid resulting from inertial navigation units measurement errors when resolving the ambiguity declines the quality of an image. A novel method has been proposed in this paper to estimate the Doppler centroid without ambiguity. According to the constant speed rotation of the antenna, from the expression for the coherent echoes, two parameters can be estimated, i. e., initial azimuth angle of the first echo in the coherent echoes, and the product of the velocity of plane and the cosine of elevation angle. Then Doppler eentroid of the coherent echoes will be calculated from them without ambiguity. The results of computer simulation and the processing results of real DBS data prove the effectiveness of the processing procedure.

关 键 词：多普勒波束锐化 多普勒中心 机械扫描 参数估计 

分 类 号：TN957[电子电信—信号与信息处理]