Effects of Anisotropic Ionospheric Irregularities on Space-Borne SAR Imaging

Effects of Anisotropic Ionospheric Irregularities on Space-Borne SAR Imaging
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各向异性电离层不规则性对星载SAR成像的影响

DOI:
10.1109/tap.2014.2333055
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发表时间:
2014-06
影响因子:
5.7
通讯作者:
Cheng Wang, Min Zhang, Zheng-Wen Xu, Chun Chen, D
Cheng Wang, Min Zhang, Zheng-Wen Xu, Chun Chen, D
中科院分区:
计算机科学2区
文献类型:
--
作者:
Cheng Wang, Min Zhang, Zheng-Wen Xu, Chun Chen, D

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讨论了电离层各向异性对星载合成孔径雷达(SAR)成像质量的影响。在电离层不规则体斜入射和各向异性的情况下,从改进的横向相关函数导出了两种电离层对SAR成像的潜在影响。首先,在距离方向上,由于多重散射和不规则性的色散的图像移位被认为是。此外,脉冲展宽由于多次散射的不规则性也进行了研究,这将导致距离分辨率的退化。其次,在方位向,解相关距离由广义模糊函数的二阶矩得到。使用距离多普勒算法(RDA),几个退化的点目标响应由于电离层的不规则性进行了评估。仿真结果表明,在较低频率和较强的电离层起伏下,电离层不规则性对SAR成像的不利影响更加严重。
This paper discusses the degradation of space-borne synthetic aperture radar (SAR) imaging due to anisotropic ionospheric irregularities. In the case of the oblique incidence and anisotropy of ionospheric irregularities, two types of potential ionospheric effects on SAR imaging are derived from an improved transverse correlation function. First, in the range direction, the image shift due to both multiple scattering and dispersion of irregularities is considered. In addition, pulse broadening due to multiple scattering of the irregularities is also studied, which leads to degradation of the range resolution. Second, in the azimuthal direction, the decorrelation distance is obtained by the second moment of the generalized ambiguity function. Using the range Doppler algorithm (RDA), several degraded point target responses due to the ionospheric irregularities are evaluated. The simulation results show that the adverse effects of ionospheric irregularities on SAR imaging are worsened at lower frequencies and stronger ionospheric fluctuations.
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