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Terahertz Bistatic Synthetic Aperture Radar for 1-D Near-Field High-Resolution Imaging

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Abstract

Considering the difficult transceiver-isolation problem of the monostatic synthetic aperture radar (SAR) in the terahertz (THz) band, this paper proposes a compact THz bistatic SAR (BiSAR) geometry. The system allows the separately distributed transmitter and receivers. At the receiving end, there are a direct-wave receiver and an echo receiver, both operating at the heterodyne and in-phase mode. The echo receiver runs along a linear rail to fulfill the scene scanning, while the direct-wave one is fixed as a reference. Furthermore, assuming that the receivers are synchronized, both the problem of synchronization between the separated transmitter and receivers and the problem of timing at the signal acquisition would be solved by utilizing the high coherence between the echo and the direct wave. Based on such a system, the application of THz BiSAR for one-dimensional imaging is taken into consideration. Then, a high-resolution imaging algorithm is proposed benefitting from the total least squares estimating signal parameters via rotational invariance techniques (TLS-ESPRIT) and the spatial smoothing process (SSP). The imaging performance is then demonstrated by both simulations and the experiments in the 0.183 THz.

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Acknowledgements

This work was supported in part by the National Program on Key Basic Research Project of China (973 Program) (2014CB339806), the Major National Development Project of Scientific Instrument and Equipment (2012YQ15009205, 2016YFC1202505), National Natural Science Foundation of China (61605113), the Natural Science Foundation of Shanghai (16ZR1423100), Shanghai leading talent (2016-019), and Young Yangtse Rive Scholar.

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    Authors and Affiliations

    1. Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology, No. 516 JunGong Road, Shanghai, 200093, China

      Li Ding, Yangyang Ye, Guoyao Ye & Yiming Zhu

    2. Terahertz Technology Innovation Research Institute, Shanghai, China

      Li Ding & Yiming Zhu

    3. Terahertz Science Cooperative Innovation Center, Shanghai, China

      Li Ding & Yiming Zhu

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    1. Li Ding
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    2. Yangyang Ye
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    3. Guoyao Ye
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    4. Yiming Zhu
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    Correspondence to Yiming Zhu.

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    Li Ding and Yangyang Ye contributed equally to this work.

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    Ding, L., Ye, Y., Ye, G. et al. Terahertz Bistatic Synthetic Aperture Radar for 1-D Near-Field High-Resolution Imaging. J Infrared Milli Terahz Waves 39, 1162–1173 (2018). https://doi.org/10.1007/s10762-018-0530-2

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