摘要
提出一种基于面阵MIMO-SAR(Multiple Input Multiple Output Synthetic Aperture Radar)模型结合脉内扫描技术、二维空域联合处理以及频带合成技术实现高信噪比、二维高分辨大测绘带成像方法.文中首先提出了面阵SAR脉内扫描多发多收模型;分析了面阵MIMO-SAR模型下脉内扫描技术对系统信噪比性能的改善.针对脉内扫描引起的距离模糊以及低PRF(Pulse Repetition Frequency)导致的多普勒模糊,提出了二维空域联合处理方法;同时利用多发多收模型获得多个空间自由度进行频带合成实现高距离分辨.该面阵MIMO-SAR模型实现了高信噪比、二维高分辨大测绘带成像,打破了传统高分辨与大测绘带以及高信噪比与大测绘带的矛盾.仿真实验验证了本文方法的有效性.
A novel approach is presented to achieve high range and azimuth resolution wide swath with high Signal-Noise-Ratio based on the plane-array Multiple Input Multiple Output Synthetic Aperture Radar（MIMO-SAR） system by the combination of intrapulse scanning and two-dimensional spatial filter and bandwidth synthesis.This paper presents the plane-array MIMO-SAR model with the intrapulse scanning technique;We analyze the improvement of performance of the system by introducing intrapulse scanning in the MIMO-SAR model.With respect to the range ambiguities led to intrapulse scanning and Doppler ambiguities caused by low pulse repetition frequency,two-dimensional spatial filter is used to tackle range and Doppler ambiguities;at the same time bandwidth synthesis based on more the degrees of the freedom provided by the MIMO-SAR system is used to realize high range resolution.The plane-array MIMO-SAR system can be used to realize high SNR and two dimensional high resolutions,and overcomes the contradiction between the high resolution and wide swath,and breaks through the conflict between high SNR and wide swath.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2010年第4期817-824,共8页
Acta Electronica Sinica
基金
国家自然科学基金(No.60890072)
武器装备预研基金(No.9140A21020609DZ01
No.9140A07020408DZ0116)
关键词
合成孔径雷达
多发多收系统
大测绘带成像
多普勒模糊
频带合成
synthetic aperture radar（SAR）
multiple-input multiple-output（MIMO） system
wide swath imaging
range ambiguities
Doppler ambiguities
bandwidth synthesis
