A new spaceborne/airborne bistatic synthetic aperture radar time synchronization method based on fractional Fourier transform

Fang Zhou; Changchun Gui; Xinxiao Hu; Mengdao Xing; Jiajia Zhang

doi:10.1117/12.2689715

10 August 2023 A new spaceborne/airborne bistatic synthetic aperture radar time synchronization method based on fractional Fourier transform

Fang Zhou, Changchun Gui, Xinxiao Hu, Mengdao Xing, Jiajia Zhang

Author Affiliations +

Proceedings Volume 12748, 5th International Conference on Information Science, Electrical, and Automation Engineering (ISEAE 2023); 127482I (2023) https://doi.org/10.1117/12.2689715
Event: 5th International Conference on Information Science, Electrical and Automation Engineering (ISEAE 2023), 2023, Wuhan, China

Abstract

With the change of observation demands, traditional monostatic synthetic aperture radar(SAR) can no longer meet the requirements such as passive reception and cooperative multimode imaging. Spaceborne/Airborne hybrid bistatic SAR(SA-BSAR) emerges as the times require, and has been widely concerned with its flexibility, concealment. However, as the receiver and transmitter do not share the same frequency oscillation source, the impact of time error on imaging cannot be ignored as the satellite operates for a long time. At the same time, SA-BSAR is in the form of double root sign in the course of slant range. How to obtain two-dimensional(2-D) spectrum is also the key to imaging. This paper proposes a new method to estimate time error based on fractional Fourier transform (FRFT), which simplifies the traditional time error estimation steps. Finally, the Air-Phase method is used to solve the 2-D spectrum to achieve the target imaging. The algorithms proposed in this paper are implemented by FFT without interpolation, which ensures the imaging efficiency. The final experimental results show the effectiveness of the algorithm.

Citation Download Citation

Fang Zhou, Changchun Gui, Xinxiao Hu, Mengdao Xing, and Jiajia Zhang "A new spaceborne/airborne bistatic synthetic aperture radar time synchronization method based on fractional Fourier transform", Proc. SPIE 12748, 5th International Conference on Information Science, Electrical, and Automation Engineering (ISEAE 2023), 127482I (10 August 2023); https://doi.org/10.1117/12.2689715

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KEYWORDS

Synthetic aperture radar

Satellites

Error analysis

Doppler effect

Fractional fourier transform

Radar

Remote sensing

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