Jili Sun

Advantage Analysis of Spaceborne SAR Imaging in Very Low Earth Orbit: A Case Study of Haishao-1

Sheng‐Hui Yang, Jili Sun, Hongliang Lü, Shuohan Cheng et autres

Very-Low Earth Orbit Synthetic Aperture Radar (VLEO SAR) satellites, defined as SAR satellites operating at orbital altitudes 350 km or below, offer distinct technical advantages compared to conventional SAR satellites. Equipped with a high-resolution SAR payload, the Haishao-1 (HS-1) satellite was successfully …

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Polarmetric Consistency Assessment and Calibration Method for Quad-Polarized ScanSAR Based on Cross-Beam Data

Jitong Duan, Jili Sun, Liangbo Zhao, Xiaochen Wang et autres

The range-dependence on polarization distortion of spaceborne polarimetric synthetic aperture radar (SAR) affects the accuracy of wide-swath polarization applications, such as environmental monitoring, sea ice classification and ocean wave inversion. Traditional calibration methods, assessing the distortion mainly based on ground experiments, suffer …

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A Self-Supervised Iterative Convolutional Neural Network for Sar Image Despeckling

Lingdong Geng, Shuai Wang, Hongliang Lü, X. Yue et autres

Speckle noise is an inherent noise in Synthetic Aperture Radar (SAR) images. This noise complicates the training of supervised methods, as clean SAR images are practically unattainable in real-world scenarios. Using simulated or multi-temporal images is a common solution, but this limits …

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Haishao-1: The First VLEO Multi-Polarization Micro-SAR Mission

Jili Sun, Shuohan Cheng, Hongliang Lü, Wen Sun et autres

The HaiShao-1 (HS-1) is China’s first very low earth orbit (VLEO) multi-polarization micro synthetic aperture radar (SAR) satellite. Its SAR payload supports multiple imaging modes, achieving a highest resolution of 0.5 meters and a maximum swath width of 160 kilometers. It encompasses …

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Haishao-1 satellite: Low-inclination orbit spaceborne synthetic aperture radar

Xiao‐Ming Li, Liang Chang, Jian Xin Zhou, Jili Sun et autres

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Intelligent built-in test of wheel speed sensor in aircraft braking system based on FPGA acceleration

Lingdong Geng, Wenjian Sun, Jili Sun, X. Yue et autres

The built-in test (BIT) functionality of the aircraft braking system is directly related to flight safety. In the aircraft braking system, designing a reasonable and effective BIT fault diagnosis method is crucial for ensuring safe landing. The method proposed in this article …

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Research on real-time imaging method of spaceborne SAR based on embedded GPU

Shuai Wang, Hongliang Lü, Jili Sun, Xinzhi Yao et autres

Synthetic aperture radar (SAR) as an all-time, all-weather high-resolution imaging radar, can quickly and conveniently acquire the spatial distribution characteristics of a wide range of observation areas by carrying a satellite-borne platform, and it is widely used in military and civilian fields. …

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A Hybrid Model Based on Superpixel Entropy Discrimination for PolSAR Image Classification

Jili Sun, Lingdong Geng, Yize Wang

Superpixel segmentation is widely used in polarimetric synthetic aperture radar (PolSAR) image classification. However, the classification method using simple majority voting cannot easily handle evidence conflicts in a single superpixel. At present, there is no method to evaluate the quality of superpixel …

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A Novel Phase Compensation Method for Urban 3D Reconstruction Using SAR Tomography

Hongliang Lü, Jili Sun, Jili Wang, Chunle Wang

Synthetic aperture radar (SAR) tomography (TomoSAR) has been widely used in the three-dimensional (3D) reconstruction of urban areas using the multi-baseline (MB) SAR data. For urban scenarios, the MB SAR data are often acquired by repeat-pass using the spaceborne SAR system. Such …

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Calibration method to the impact of antenna scanning on TOPSAR

Di Yin, Han Bing, Jili Sun, Zhao Liangbo et autres

Correction: Yang, J., et al. Phase Imbalance Analysis of GF-3 Along-Track InSAR Data and Ocean Current Measurements. Remote Sens. 2021, 13, 269

Junxin Yang, Xinzhe Yuan, Bing Han, Liangbo Zhao et autres

The authors would like to make the following correction of [...]

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Phase Imbalance Analysis of GF-3 Along-Track InSAR Data for Ocean Current Measurement

Junxin Yang, Xinzhe Yuan, Bing Han, Liangbo Zhao et autres

There are two useful methods of current measurement based on synthetic aperture radar (SAR): one is along-track interferometry (ATI), and the other is Doppler centroid analysis (DCA). For the ATI method, the interferometric phase must be accurate enough for ocean current measurements. …

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