中文摘要：

因为同频完全正交波形并不存在，基于同频正交编码信号发射波形的多输入多输出合成孔径雷达（MIMO-SAR）因波形间互耦产生的互相关噪声将严重降低成像质量。针对此问题，该文提出基于Clean处理分离多正交波形方法，逐步获取单波形回波，并分析了其性能。数值仿真实验证明，该方法能有效抑制点目标正交波形间的互相关噪声，并接近单波形SAR的成像性能。

英文摘要：

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.