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Forward-Looking Scanning Radar Superresolution Imaging Based on Second-Order Accelerated Iterative Shrinkage-Thresholding Algorithm
- Source :
- IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, Vol 13, Pp 620-631 (2020)
- Publication Year :
- 2020
- Publisher :
- Institute of Electrical and Electronics Engineers (IEEE), 2020.
-
Abstract
- Scanning radar can be used to obtain images of targets in forward-looking area, and has attracted much attention in many fields, such as ocean monitoring, air-to-ground attack, navigation, and so on. However, its azimuth resolution is extremely poor due to the limitation of the antenna size. In order to break through the limitation, many superresolution algorithms have been proposed, and iterative shrinkage-thresholding algorithm (ISTA) is one of the most famous methods because of its antinoise ability and simplicity. In the meantime, the slow convergence of iterative shrinkage-thresholding algorithm is also known to all. In this article, a second-order accelerated ISTA for scanning radar forward-looking superresolution imaging is proposed. In this algorithm, a prediction vector is constructed before each iteration by using the first and the second-order difference information of iteration vectors to reduce the number of iterations and get a faster convergence speed. In the end, simulations and experimental results are given to illustrate the effectiveness of the accelerated imaging algorithm.
- Subjects :
- Atmospheric Science
Computer science
Geophysics. Cosmic physics
0211 other engineering and technologies
02 engineering and technology
law.invention
law
Convergence (routing)
0202 electrical engineering, electronic engineering, information engineering
Slow convergence
Computers in Earth Sciences
Radar
TC1501-1800
021101 geological & geomatics engineering
Accelerated imaging
QC801-809
scanning radar
Order (ring theory)
020206 networking & telecommunications
Resolution (logic)
Superresolution
Ocean engineering
Azimuth
slow convergence
iterative shrinkage-thresholding algorithm (ISTA)
Antenna (radio)
azimuth resolution
Algorithm
Subjects
Details
- ISSN :
- 21511535 and 19391404
- Volume :
- 13
- Database :
- OpenAIRE
- Journal :
- IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
- Accession number :
- edsair.doi.dedup.....e7bb97f9ebd52498ea763a5f3c46fe1f