摘要
现有的多发多收合成孔径雷达(multiple input multiple output synthetic aperture radar,MIMOSAR)正交波形正交性不足,回波间相互干扰严重,难以满足实际应用的要求。为此提出一种方位相位编码(azimuth phase coding,APC)线性调频(linear frequency modulation,LFM)波形,该波形对不同发射通道发射的线性调频信号进行相应的方位相位编码,其回波分离在方位相位解调后通过方位波束形成实现,回波间的干扰能够被充分消除。可用于高度维多发多收合成孔径雷达系统,提高多基线干涉SAR(interferometric SAR,InSAR)的干涉测高精度或三维成像的高度维成像性能。仿真结果验证了该波形的可行性及方位波束形成回波分离方法的有效性。
Azimuth phase coding linear frequency modulation（APC-LFM）waveforms for multiple-input multiple-output synthetic aperture radar （MIMO-SAR）system are presented,considering the fact that available orthogonal waveforms introduce great cross-interferences due to their inadequate orthogonality and then cannot meet the requirement of practical application.After azimuth phase decoding,mutual interferences from different radar echoes are suppressed by azimuth digital beamforming （DBF）,and then radar echoes from different trans-mit channels are separated.The APC-LFM waveforms can be used for MIMO-SAR in elevation to improve the performance of multibaseline InSAR and three dimensional SAR imaging.The simulation results validate the feasibility of the APC-LFM signal and the effectiveness of echo separation presented.
出处
《系统工程与电子技术》
EI
CSCD
北大核心
2014年第8期1505-1510,共6页
Systems Engineering and Electronics
基金
国家高技术研究与发展计划(863计划)(2013AA122202)资助课题
关键词
多发多收合成孔径雷达
正交波形
波束形成
方位相位编码
multiple-input multiple-output synthetic aperture radar （MIMO-SAR）
orthogonal waveforms
digital beamforming （DBF）
azimuth phase coding （APC）
