IR-UWB近距离实孔径成像系统分辨率

黄冬梅, 张钦宇

哈尔滨工业大学深圳研究生院



摘要:

为了解决传统"窄带、远场"分辨率计算公式不再适用于超宽带极窄脉冲(IR-UWB)近距离实孔径成像系统的问题,提出了一种新的分辨率的计算方法.通过对IR-UWB近距离成像原理的分析,推导了单天线在距离向及横向分辨率的解析表达式,结合图像重建过程中信号叠加原理,提出了一种实孔径均匀线阵分辨率的计算方法.通过对理想点目标成像结果的数值仿真,验证了该分辨率计算方法的正确性.

关键词:  分辨率  超宽带极窄脉冲  实孔径天线阵  近场  成像

DOI：10.11918/j.issn.0367-6234.2011.09.014

分类号:TN820.15

基金项目:国家自然科学基金资助项目(60702034)



Resolution of IR-UWB near-field real-aperture imaging systems

HUANG Dong-mei, ZHANG Qin-yu

Shenzhen Graduate School,Harbin Institute of Technology,518055 Shenzhen,China

Abstract:

To solve the problem that the traditional "narrow-band,far-field" resolution formulas are no longer suitable for Impulse Radio Ultra-Wide Band(IR-UWB) real aperture imaging systems,a new algorithm to compute the resolution was proposed.On analysis of IR-UWB near-field imaging principle,the formulation of resolution in down-and cross-range for single antenna was derived.Combined with signal superposition in the process of imaging,an algorithm to compute the resolution for real-aperture uniform linear array was presented.Numerical simulation results of ideal point targets imaging verified the correctness of the algorithm.

Key words:  resolution  IR-UWB  real-aperture antenna arrays  near-field  imaging