Title
Signal processing for FMCW SAR
Author
Meta, A.
Hoogeboom, P.
Ligthart, L.P.
Publication year
2007
Abstract
The combination of frequency-modulated continuous-wave (FMCW) technology and synthetic aperture radar (SAR) techniques leads to lightweight cost-effective imaging sensors of high resolution. One limiting factor to the use of FMCW sensors is the well-known presence of nonlinearities in the transmitted signal. This results in contrast- and range-resolution degradation, particularly when the system is intended for high-resolution long-range applications, as it is the case for SAR. This paper presents a novel processing solution, which solves the nonlinearity problem for the whole range profile. Additionally, the conventional stop-and-go approximation used in pulse-radar algorithms is not valid in FMCW SAR applications under certain circumstances. Therefore, the motion within the sweep needs to be taken into account. Analytical development of the FMCW SAR signal model, starting from the deramped signal and without using the stop-and-go approximation, is presented in this paper. The model is then applied to stripmap, spotlight, and single-transmitter/multiple-receiver digital-beamforming SAR operational mode. The proposed algorithms are verified by processing real FMCW SAR data collected with the demonstrator system built at the Delft University of Technology. © 2007 IEEE.
Subject
Doppler frequency correction
Frequency-modulated continuous wave (FMCW)
Nonlinearity correction
Synthetic aperture radar (SAR)
Beamforming
Cost effectiveness
Image sensors
Imaging systems
Mathematical models
Transmitters
Long-range applications
To reference this document use:
http://resolver.tudelft.nl/uuid:bb265211-20b3-49d8-858e-f996e62ad33f
DOI
https://doi.org/10.1109/tgrs.2007.906140
TNO identifier
240254
Source
IEEE Transactions on Geoscience and Remote Sensing, 45 (11), 3519-3532
Document type
article