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Near-Space TOPSAR Large-Scene Full-Aperture Imaging Scheme Based on Two-Step Processing.
- Source :
- Sensors (14248220); Aug2016, Vol. 16 Issue 8, p1177, 15p
- Publication Year :
- 2016
-
Abstract
- Free of the constraints of orbit mechanisms, weather conditions and minimum antenna area, synthetic aperture radar (SAR) equipped on near-space platform is more suitable for sustained large-scene imaging compared with the spaceborne and airborne counterparts. Terrain observation by progressive scans (TOPS), which is a novel wide-swath imaging mode and allows the beam of SAR to scan along the azimuth, can reduce the time of echo acquisition for large scene. Thus, near-space TOPS-mode SAR (NS-TOPSAR) provides a new opportunity for sustained large-scene imaging. An efficient full-aperture imaging scheme for NS-TOPSAR is proposed in this paper. In this scheme, firstly, two-step processing (TSP) is adopted to eliminate the Doppler aliasing of the echo. Then, the data is focused in two-dimensional frequency domain (FD) based on Stolt interpolation. Finally, a modified TSP (MTSP) is performed to remove the azimuth aliasing. Simulations are presented to demonstrate the validity of the proposed imaging scheme for near-space large-scene imaging application. [ABSTRACT FROM AUTHOR]
- Subjects :
- IMAGE processing
SYNTHETIC aperture radar
SPACE-based radar
INTERPOLATION
AZIMUTH
Subjects
Details
- Language :
- English
- ISSN :
- 14248220
- Volume :
- 16
- Issue :
- 8
- Database :
- Complementary Index
- Journal :
- Sensors (14248220)
- Publication Type :
- Academic Journal
- Accession number :
- 117401625
- Full Text :
- https://doi.org/10.3390/s16081177