PFDIR - A Wideband Photonic-Assisted SAR System

The next generation of synthetic aperture radar (SAR) systems will need transmit and receive analog signals over a wide frequency range with large bandwidth to fulfil the increasing demands. Since the performance of the digital microwave component is deteriorated at increasing frequency, radio frequ...

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Veröffentlicht in:IEEE transactions on aerospace and electronic systems 2023-08, Vol.59 (4), p.4333-4346
Hauptverfasser: Li, Ruoming, Li, Wangzhe, Dong, Yongwei, Wen, Zhilei, Zhang, Hanqing, Sun, Wei, Yang, Jiyao, Zeng, Henan, Deng, Yuhui, Luan, Yuchen, Xu, Weidi, Yang, Siwen, Mo, Zhenwei
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Sprache:eng
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Zusammenfassung:The next generation of synthetic aperture radar (SAR) systems will need transmit and receive analog signals over a wide frequency range with large bandwidth to fulfil the increasing demands. Since the performance of the digital microwave component is deteriorated at increasing frequency, radio frequency (RF) front-end with the capability of frequency conversion is needed for frequency beyond a few gigahertz. However, for the widely employed RF mixers, the inherent imperfect of I-V characteristics of nonlinear devices, generates many undesired mixing spurs, which restricts on the instantaneous bandwidth and the spurious-free dynamic range. At Aerospace Information Research Institute Chinese Academy of Sciences, a photonic-assisted front-end with functions of signal generation and deramp processing has been conceived and implemented in an experimental deramp-on-receive CW SAR system. The system is called Photonic-Assisted Front-End Deramp-on-Receive Imaging Radar and is envisaged to obtain SAR imaging at high resolution. In current stage, the Ku-band system with a bandwidth of 5.72 GHz, corresponding to a relative bandwidth of 37.8%, operates well with a fixed two-horn antenna. The configuration of the photonic front-end and the system design are described. Ground-based tests and airborne imaging results with geometrical resolution down to 5 cm are presented.
ISSN:0018-9251
1557-9603
DOI:10.1109/TAES.2023.3240111