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A Wide-Swath Spaceborne TOPS SAR Image Formation Algorithm Based on Chirp Scaling and Chirp-Z Transform
- Source :
- Sensors; Volume 16; Issue 12; Pages: 2095, Sensors, Vol 16, Iss 12, p 2095 (2016), Sensors (Basel, Switzerland)
- Publication Year :
- 2016
- Publisher :
- MDPI, 2016.
-
Abstract
- Based on the terrain observation by progressive scans (TOPS) mode, an efficient\ud full-aperture image formation algorithm for focusing wide-swath spaceborne TOPS data is proposed.\ud First, to overcome the Doppler frequency spectrum aliasing caused by azimuth antenna steering,\ud the range-independent derotation operation is adopted, and the signal properties after derotation\ud are derived in detail. Then, the azimuth deramp operation is performed to resolve image folding\ud in azimuth. The traditional dermap function will introduce a time shift, resulting in appearance\ud of ghost targets and azimuth resolution reduction at the scene edge, especially in the wide-swath\ud coverage case. To avoid this, a novel solution is provided using a modified range-dependent deramp\ud function combined with the chirp-z transform. Moreover, range scaling and azimuth scaling are\ud performed to provide the same azimuth and range sampling interval for all sub-swaths, instead of the\ud interpolation operation for the sub-swath image mosaic. Simulation results are provided to validate\ud the proposed algorithm.
- Subjects :
- Image formation
SAR
TOPS
modified azimuth deramp
chirp-z
Computer science
Bluestein's FFT algorithm
0211 other engineering and technologies
02 engineering and technology
lcsh:Chemical technology
Biochemistry
Signal
Article
Analytical Chemistry
Reduction (complexity)
Aliasing
0202 electrical engineering, electronic engineering, information engineering
Computer vision
lcsh:TP1-1185
Electrical and Electronic Engineering
Instrumentation
021101 geological & geomatics engineering
business.industry
020206 networking & telecommunications
Atomic and Molecular Physics, and Optics
Artificial intelligence
Antenna (radio)
business
Algorithm
Interpolation
Subjects
Details
- Language :
- English
- ISSN :
- 14248220
- Database :
- OpenAIRE
- Journal :
- Sensors; Volume 16; Issue 12; Pages: 2095, Sensors, Vol 16, Iss 12, p 2095 (2016), Sensors (Basel, Switzerland)
- Accession number :
- edsair.doi.dedup.....10a19860ecacab0c14c01fe0e483484d