Research Papers

Effect of detection on spatial resolution in synthetic aperture radar imagery and mitigation through upsampling

[+] Author Affiliations
Khalid El-Darymli

Northern Radar, 25 Anderson Avenue, St. John's, Newfoundland, A1B 3E4, Canada

Memorial University, Faculty of Engineering & Applied Science, St. John’s, Newfoundland, A1B 3X5 Canada

Peter McGuire

C-CORE, Captain Robert A. Bartlett Building, Morrissey Road, St. John’s, Newfoundland, A1C 3X5, Canada

Eric Gill

Memorial University, Faculty of Engineering & Applied Science, St. John’s, Newfoundland, A1B 3X5 Canada

Desmond Power

C-CORE, Captain Robert A. Bartlett Building, Morrissey Road, St. John’s, Newfoundland, A1C 3X5, Canada

Cecilia Moloney

Memorial University, Faculty of Engineering & Applied Science, St. John’s, Newfoundland, A1B 3X5 Canada

J. Appl. Remote Sens. 8(1), 083601 (Jul 25, 2014). doi:10.1117/1.JRS.8.083601
History: Received October 23, 2013; Revised April 14, 2014; Accepted April 29, 2014
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Abstract.  The complex-valued image output from a synthetic aperture radar (SAR) processor possesses full spatial resolution defined by the sensor. Typically, this image is either power detected or magnitude detected before it is subjected to further analysis. This paper consists of the study of the effect of detection on spatial resolution in complex-valued SAR imagery and the mitigation of this effect through upsampling. Furthermore, an algorithm for upsampling focused SAR imagery is presented. The proposed algorithm is general and it is designed to account for deviations from zero-Doppler encountered in the Spotlight imaging mode. It is shown that power and magnitude detections, respectively, degrade the spatial resolution by factors of two and greater. To mitigate this effect, the complex-valued SAR image should be upsampled appropriately. The results are demonstrated on real-world single-look complex SAR imagery from Radarsat-2.

© 2014 Society of Photo-Optical Instrumentation Engineers

Citation

Khalid El-Darymli ; Peter McGuire ; Eric Gill ; Desmond Power and Cecilia Moloney
"Effect of detection on spatial resolution in synthetic aperture radar imagery and mitigation through upsampling", J. Appl. Remote Sens. 8(1), 083601 (Jul 25, 2014). ; http://dx.doi.org/10.1117/1.JRS.8.083601


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