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A Novel MIMO-SAR System Based on Simultaneous Digital Beam Forming of Both Transceiver and Receiver

机译:一种基于收发器和接收器的同时数字光束形成的新型MIMO-SAR系统

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摘要

Orthogonal frequency division multiplexing (OFDM) chirp waveform, which is composed of two or more successive identical linear frequency modulated sub pulses, is a newly proposed orthogonal waveform scheme for multi-input multi-output (MIMO) synthetic aperture radar (SAR) systems. However, according to the waveform model, there will be range ambiguity if the mapping width exceeds the maximum unambiguous width determined by the transmitted signal. This greatly limits its application in high-resolution wide-swath (HRWS) remote sensing. The traditional system divides the echoes by digital beam forming (DBF) to solve this problem, but the energy utilization rate is low. A MIMO-SAR system using simultaneous digital beam forming of both transceiver and receiver to avoid range ambiguity is designed in this paper. Compared with traditional system, the novel system designed in this paper obtain higher energy utilization and waveform orthogonality.
机译:由两个或多个连续相同的线性频率调制子脉冲组成的正交频分复用(OFDM)Chirp波形是用于多输入多输出(MIMO)合成孔径雷达(SAR)系统的新提出的正交波形方案。然而,根据波形模型,如果映射宽度超过由发送的信号确定的最大明确宽度,则存在范围模糊。这极大地限制了其在高分辨率宽处(HRW)遥感中的应用。传统系统通过数字束形成(DBF)划分回声来解决这个问题,但能量利用率低。采用收发器和接收器的同时数字光束形成的MIMO-SAR系统以避免距离模糊。与传统系统相比,本文中设计的新型系统获得了更高的能量利用率和波形正交性。

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