The multiple-input-multiple-output (MIMO) synthetic aperture radar (SAR) system with a linear antenna array can obtain 3D\nresolution. In practice, it suffers from both the translational motion errors and the rotational motion errors. Conventional single channel\nmotion compensation methods could be used to compensate the motion errors channel by channel. However, this method\nmight not be accurate enough for all the channels.What is more, the single-channel compensation may break the coherence among\nchannels, which would cause defocusing and false targets. In this paper, both the translational motion errors and the rotational\nmotion errors are discussed, and a joint multichannel motion compensation method is proposed for MIMO SAR 3D imaging. It is\ndemonstrated through simulations that the proposed method exceeds the conventional methods in accuracy. And the final MIMO\nSAR 3D imaging simulation confirms the validity of the proposed algorithm.
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