© The Institution of Engineering and Technology
The focusing of squint beam-steering synthetic aperture radar (SAR) data is a challenging task for the technical difficulty of space-variant range cell migration correction (RCMC). It is more complicated when considering the manoeuver of high-speed platforms. The conventional Doppler domain RCMC method is with low performance and requires a large amount of zero-padding. This Letter proposes a modified RCMC method which removes the space-variant range cell migration (RCM) components by deramp-keystone transform and then compensates the unified RCM terms in the time domain. Compared with the conventional method, the proposed one is with high performance and can avoid zero-padding. This method is validated by the simulated SAR data.
References
-
-
1)
-
3. Wu, Y., Sun, G.-C., Xia, X.-G., et al: ‘An azimuth frequency non-linear chirp scaling (FNCS) algorithm for TOPS SAR imaging with high squint angle’, J. Sel. Topics Appl. Earth Observ. Remote Sens., 2014, 7, (1), pp. 213–221, (doi: 10.1109/JSTARS.2013.2258893).
-
2)
-
2. Li, Z., Xing, M., Liang, Y., et al: ‘A frequency-domain imaging algorithm for highly squinted SAR mounted on maneuvering platforms with nonlinear trajectory’, Trans. Geosci. Remote Sens., 2016, 54, (7), pp. 4023–4038, (doi: 10.1109/TGRS.2016.2535391).
-
3)
-
23. Perry, R.P., Dipietro, R.C., Fante, R.L.: ‘SAR imaging of moving targets’, IEEE Trans. Aerosp. Electr. Syst., 1999, 35, (1), pp. 188–200 (doi: 10.1109/7.745691).
-
4)
-
2. Prats, P., Scheiber, R., Mittermayer, J., Meta, A., Moreira, A.: ‘Processing of sliding spotlight and TOPS SAR data using baseband azimuth scaling’, IEEE Trans. Geosci. Remote Sens., 2010, 48, (2), pp. 770–780 (doi: 10.1109/TGRS.2009.2027701).
-
5)
-
4. Sun, Z., Wu, J., Li, Z., et al: ‘Highly squint SAR data focusing based on keystone transform and azimuth extended nonlinear chirp scaling’, Geosci. Remote Sens. Lett., 2015, 12, (1), pp. 145–149, (doi: 10.1109/LGRS.2014.2329554).
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Space-variant RCMC method for squint beam-steering SAR imaging on high-speed manoeuvring platforms