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KT and azimuth sub‐region deramp‐based high‐squint SAR imaging algorithm mounted on manoeuvring platforms
- Source :
- IET Radar, Sonar & Navigation. 14:388-398
- Publication Year :
- 2020
- Publisher :
- Institution of Engineering and Technology (IET), 2020.
-
Abstract
- Owing to the existence of high-order motion parameters and vertical velocity, severe range-azimuth coupling and two-dimensional spatial variability of the imaging parameters degrade the image quality of high-squint synthetic aperture radar (SAR) mounted on manoeuvring platforms. To accommodate these issues, a novel sub-aperture SAR imaging algorithm based on keystone transform (KT) and azimuth sub-region deramp is proposed. In the range dimension processing, a correction function is constructed based on the scene centre to realise non-spatial-variant range cell migration (RCM) correction and range-azimuth decoupling, and then the residual spatial-variant RCM is removed by the KT. In the azimuth dimension processing, considering the impact of the range distortion on the azimuth modulated phase, accurate analytical formula of the signal in the azimuth time domain is deduced. On this basis, a fast azimuth compression method based on the azimuth sub-region deramp is proposed, and the theoretical effective imaging area is analysed. The theoretical analysis and the simulations show that the proposed imaging algorithm has high computational efficiency and can effectively expand the imaging area of high-squint SAR mounted on manoeuvring platforms.
- Subjects :
- Synthetic aperture radar
Computer science
Image quality
Acoustics
020206 networking & telecommunications
02 engineering and technology
Azimuth
Distortion
Radar imaging
Frequency domain
0202 electrical engineering, electronic engineering, information engineering
Time domain
Electrical and Electronic Engineering
Data compression
Subjects
Details
- ISSN :
- 17518792
- Volume :
- 14
- Database :
- OpenAIRE
- Journal :
- IET Radar, Sonar & Navigation
- Accession number :
- edsair.doi...........c20524ef17515a89cd2a65a18f8d631c