摘要
MIMO SAR是解决高分宽幅问题的有效途径,其核心问题是如何设计相互正交的发射波形。研究表明,经典的相位编码、离散频率编码等MIMO正交波形不适合实际场景SAR成像,目标点附近区域的回波叠加后对主回波造成严重干扰,引起成像SNR的下降和图像质量的恶化。最近,德国DLR的Krieger教授提出了短时平移正交(short-term shift-orthogonal)波形的概念,结合距离向的波束形成可实现回波信号的有效分离,但未对其成像性能进行细致分析。文中从衡量SAR成像质量的具体指标出发,包括综合积分旁边比(ISLR)等,通过理论分析和仿真验证对比了短时平移正交波形和传统编码正交波形的SAR成像性能。
MIMO SAR is an effective way to solve the problem of high score wide, the main problem is how to design the orthogonal waveform. The studies show that the classical phase coding is not suitable for the actual scene of SAR imaging, the reason is that the echo from the vicinity of the target may cause serious interference to the primary echo. Recently, Krieger proposed the short-time translational orthogonal waveform, the concept of combination of distance to beamforming can achieve effective separation of echo signal, which didn＇ t make a detailed analysis on the imaging properties. This paper, starting from the specific indicators of SAR imaging quality, including ISLR and so on, through the theoretical analysis and simulation verification, compared the short-term shift-orthogonal waveform and traditional waveform performance of SAR imaging.
出处
《信息技术》
2015年第12期125-128,共4页
Information Technology
关键词
MIMO雷达
SAR成像
正交波形设计
短时平移正交波形
MIMO radar
synthetic aperture radar （SAR） imaging
orthogonal waveforms design
short-term shifting orthogonal waveforms
