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Zhao Y, Chen L, Zhang F, Li Y, Wu Y. A Novel MIMO-SAR System Based on Simultaneous Digital Beam Forming of Both Transceiver and Receiver. Sensors (Basel) 2020; 20:s20226604. [PMID: 33218098 PMCID: PMC7698899 DOI: 10.3390/s20226604] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Revised: 11/11/2020] [Accepted: 11/16/2020] [Indexed: 11/30/2022]
Abstract
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.
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Affiliation(s)
- Yuzhen Zhao
- Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China
- National Key Laboratory of Microwave Imaging Technology, Beijing 100190, China
- School of Electronics, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Longyong Chen
- Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China
- National Key Laboratory of Microwave Imaging Technology, Beijing 100190, China
- School of Electronics, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Fubo Zhang
- Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China
- National Key Laboratory of Microwave Imaging Technology, Beijing 100190, China
- School of Electronics, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yanlei Li
- Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China
- National Key Laboratory of Microwave Imaging Technology, Beijing 100190, China
- School of Electronics, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yirong Wu
- Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China
- National Key Laboratory of Microwave Imaging Technology, Beijing 100190, China
- School of Electronics, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
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