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.


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    Title :

    PFDIR – A Wideband Photonic-Assisted SAR System


    Contributors:
    Li, Ruoming (author) / Li, Wangzhe (author) / Dong, Yongwei (author) / Wen, Zhilei (author) / Zhang, Hanqing (author) / Sun, Wei (author) / Yang, Jiyao (author) / Zeng, Henan (author) / Deng, Yuhui (author) / Luan, Yuchen (author)


    Publication date :

    2023-08-01


    Size :

    4643192 byte




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



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