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Article

On the Frequency Sweep Rate Estimation in Airborne FMCW SAR Systems

1
Institute for Electromagnetic Sensing of the Environment (IREA), National Research Council (CNR), 80124 Napoli, Italy
2
Department of Engineering (DI), Università degli Studi di Napoli “Parthenope”, 80143 Napoli, Italy
*
Author to whom correspondence should be addressed.
Remote Sens. 2020, 12(20), 3448; https://0-doi-org.brum.beds.ac.uk/10.3390/rs12203448
Received: 14 August 2020 / Revised: 5 October 2020 / Accepted: 14 October 2020 / Published: 20 October 2020
Use of Frequency Modulated Continuous Wave (FMCW) Synthetic Aperture Radar (SAR) systems requires to accurately know the electronic parameters of the system. In particular, the use of an incorrect value of the Frequency Sweep Rate (FSR) introduces geometric distortions in the focused images. Recently, a method, that we name FSR Estimate Through Corner reflectors (FSRETC), has been proposed to estimate the FSR value actually employed by the radar. The method is based on the use of the SAR image focused with the available erroneous FSR. Moreover, it exploits a number of Corner Reflectors (CRs) deployed over the illuminated area. In this work, we provide an assessment of the capabilities of the FSRETC algorithm. The overall analysis is performed through the use of a real dataset consisting of 10 acquisitions carried out in 2018 (5 acquisitions) and 2019 (5 acquisitions) with an airborne FMCW SAR system. The presented experimental analysis shows that even with a single acquisition, use of two CRs sufficiently far from each other in the range direction, allows achieving an accurate estimate of the searched FSR. Moreover, it is shown that the obtained estimate is very stable over the time. Therefore, the overall procedure can be applied only once, since the estimated values can be safely used for the subsequent missions, at least for the time interval considered in the work, that is, 14 months. In addition, the presented results pose the basis for an enhanced measurement strategy that allows effective application of the FSRETC algorithm through the use of only one CR. View Full-Text
Keywords: Synthetic Aperture Radar (SAR); FMCW SAR; Airborne SAR; Radar parameter estimation Synthetic Aperture Radar (SAR); FMCW SAR; Airborne SAR; Radar parameter estimation
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MDPI and ACS Style

Esposito, C.; Berardino, P.; Natale, A.; Perna, S. On the Frequency Sweep Rate Estimation in Airborne FMCW SAR Systems. Remote Sens. 2020, 12, 3448. https://0-doi-org.brum.beds.ac.uk/10.3390/rs12203448

AMA Style

Esposito C, Berardino P, Natale A, Perna S. On the Frequency Sweep Rate Estimation in Airborne FMCW SAR Systems. Remote Sensing. 2020; 12(20):3448. https://0-doi-org.brum.beds.ac.uk/10.3390/rs12203448

Chicago/Turabian Style

Esposito, Carmen, Paolo Berardino, Antonio Natale, and Stefano Perna. 2020. "On the Frequency Sweep Rate Estimation in Airborne FMCW SAR Systems" Remote Sensing 12, no. 20: 3448. https://0-doi-org.brum.beds.ac.uk/10.3390/rs12203448

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