An Orthogonal Waveform Separation Method Based on Clean Processing in MIMO-SAR
Meng Cang-zhen①③ Xu Jia② Wang Li-bao③ Yang Jian① Peng Ying-ning①
①(Department of Electronic Engineering, Tsinghua University, Beijing 100084, China) ②(School of Information and Electronic, Beijing Institute of Technology, Beijing 100081, China) ③(Air Force Early Warning Academy of PLA, Wuhan 430019, China)
Abstract：Because the real orthogonal waveforms occupying the same frequency band may not realistically be found, the imaging quality is degraded by the cross-correlation noise caused by coupling among these waveforms for MIMO-SAR system that transmits the same frequency coded orthogonal waveforms. To address the above problem, a novel orthogonal waveform separation method is proposed based on Clean processing and is used to obtain the echoes from each waveform. Then, its performance is discussed. Finally, the numerical experiments are provided to demonstrate the effectiveness of the proposed method to suppress the cross-correlation noise among orthogonal waveforms for point scatterer and verify that its imaging performance approaches that of conventional SAR with single transmitting waveform.
2013, Vol. 35 
