MIMO雷达等效相位中心误差分析

为便于MIMO (Multiple-Input Multiple-Output) 雷达在接收端相干处理多通道回波数据，该文首先基于相位中心近似来简化MIMO雷达信号模型。以产生等效相位中心误差为代价，将MIMO雷达的多收发阵列结构转化成为收发同置的单站形式。通过分析等效相位中心与收发阵元之间的几何关系，解析描述了等效相位中心误差。而后对等效相位中心误差进行了理论分析，推导出一些与误差校正有关的基本性质。针对收发阵元间距的不同取值范围，设计了相应的等效相位中心误差校正表示式。最后利用数值仿真实验完成了等效相位中心误差分析有效性的定量评估。

Analysis of Displaced Phase Center Error in MIMO Radar

In order to process the multi-channel received data coherently in a convenient way, this paper simplifies MIMO (Multiple-Input Multiple-Output) radar signal model using phase center approximation, firstly. The multiple-transmit multiple-receive array architecture of MIMO radar is transformed into monostatic situation at the cost of causing displaced phase center error. Through the geometry of phase center approximation, definition of displaced phase center error is obtained. Displaced phase center error is analyzed in depth and some basic properties related to error correction are derived. Error correction expression of displaced phase center is designed according to the extent of space between receive and transmit phase center. Finally, the numerical experiments are provided to demonstrate the effectiveness of the theoretical analysis in this paper.