Robust Clutter Suppression and Ground Moving Target Imaging Method for a Multichannel SAR with High-Squint Angle Mounted on Hypersonic Vehicle

Han, Jiusheng; Cao, Yunhe; Yeo, T.S.; Wang, Fengfei

doi:10.3390/rs13112051

Cited by 6 publications

(3 citation statements)

References 53 publications

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“…Hypersonic platform-borne synthetic aperture radar (SAR) imaging has a promising application prospect [1][2][3][4][5]. The hypersonic platform-borne SAR works at a typical altitude between 20 and 100 km with a speed over Mach 5 [6,7].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…As hypersonic platform-borne SAR imaging plays an important role in civilian and military fields, many researchers studied it from different aspects [1][2][3][4][5]14,15]. For range migration and pulse broadening phenomenon caused by the "scale effect" which will lead to the decrease of SAR imaging resolution, Xu [3] proposed the corresponding compensating factors in matched filleter to solve this problem. Han [4] proposed a robust clutter suppression and detection of ground moving target (GMT) imaging method for a multichannel hypersonic-vehicle borne synthetic aperture radar (MC-HSV-SAR) with high-squint angle.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Hypersonic Platform-Borne SAR Imaging: A Physical Perspective

Song

Bai

et al. 2021

Remote Sensing

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The usage of a hypersonic platform for remote sensing application has promising prospects, especially for hypersonic platform-borne synthetic aperture radar (SAR) imaging. However, the high-speed of hypersonic platform will lead to extreme friction between the platform and air, which will cause the ionization of air. The ionized gas forms the plasma sheath wrapped around the hypersonic platform. The plasma sheath will severely affect the propagation of SAR signal and further affect the SAR imaging. Therefore, hypersonic platform-borne SAR imaging should be studied from a physical perspective. In this paper, hypersonic platform-borne SAR imaging under plasma sheath is analyzed. The SAR signal propagation in plasma sheath is computed using scatter matrix method. The proposed SAR signal model is verified by using a ground experiment system. Moreover, the effect of attenuation caused by plasma sheath on SAR imaging is studied under different SAR parameters and plasma sheath. The result shows that attenuation caused by plasma sheath will degrade the SAR imaging quality and even cause the point and area targets to be submerged into the noise. The real SAR images under plasma sheath also illustrate this phenomenon. Furthermore, by studying imaging results under different SAR and plasma parameters, it can be concluded that the severe degradation of SAR imaging quality appears at condition of high plasma sheath electron density and low SAR carrier frequency. The work in this paper will be beneficial for the study of hypersonic platform-borne SAR imaging and design of hypersonic SAR imaging systems in the future.

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