Abstract
To process the spaceborne high-squint SAR data, the linear range cell migration correction (LRCMC) is conducted firstly. Although the target linear range cell migration (LRCM) is removed and the range-azimuth coupling of two-dimensional spectrum is reduced through LRCMC, it also causes the azimuth spatial variation of focusing parameters. The spatial variation of focusing parameters is caused by azimuth spatial variation of slant-range and equivalent velocity in spaceborne SAR system. However, the most existed imaging algorithms neglect the azimuth spatial-variant equivalent velocity, which will decrease the imaging quality. In this paper, the azimuth spatial variation of focusing parameters is analysed precisely. And a modified imaging algorithm based on azimuth nonlinear chirp scaling is proposed. Simulation of high-squint strip-map data verifies the accuracy of the proposed algorithm.
| Original language | English |
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| Title of host publication | IET Conference Proceedings |
| Publisher | Institution of Engineering and Technology |
| Pages | 999-1003 |
| Number of pages | 5 |
| Volume | 2020 |
| Edition | 9 |
| ISBN (Electronic) | 9781839535406 |
| DOIs | |
| Publication status | Published - 2020 |
| Event | 5th IET International Radar Conference, IET IRC 2020 - Virtual, Online Duration: 4 Nov 2020 → 6 Nov 2020 |
Conference
| Conference | 5th IET International Radar Conference, IET IRC 2020 |
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| City | Virtual, Online |
| Period | 4/11/20 → 6/11/20 |
Keywords
- Azimuth Nonlinear Chirp Scaling (NCS)
- Azimuth spatial variation
- High-squint mode
- Synthetic Aperture Radar (SAR)