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Progress In Electromagnetics Research
ISSN: 1070-4698, E-ISSN: 1559-8985
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NEW DEVELOPMENT OF TWO-STEP PROCESSING APPROACH FOR SPOTLIGHT SAR FOCUSING IN PRESENCE OF SQUINT

By Y. Mo, Y.-K. Deng, Y.-H. Luo, B.-J. Zhao, and H. Yan

Full Article PDF (714 KB)

Abstract:
This paper analyzes the azimuth spectrum folding problem which arises from the dependence of the Doppler centroid on range frequency in squinted spotlight synthetic aperture radar (SAR). Based on the analysis, a novel approach for squinted spotlight SAR is proposed in this paper. In this approach, an azimuth preprocessing step including a deramping operation and an operation of azimuth spectrum replicating and filtering is introduced to eliminate spectrum folding problem. Then, a modified Range Migration Algorithm (RMA) is adopted to process the preprocessed data. This approach extends the focusing capacity of traditional two-step processing approach from broadside spotlight SAR to squinted case. Moreover, this approach is eĀ±cient due to a limited azimuth data extension to resolve the spectrum aliasing problem. Experimental results on simulated raw data validate the proposed approach.

Citation:
Y. Mo, Y.-K. Deng, Y.-H. Luo, B.-J. Zhao, and H. Yan, "New Development of Two-Step Processing Approach for Spotlight SAR Focusing in Presence of Squint," Progress In Electromagnetics Research, Vol. 139, 317-334, 2013.
doi:10.2528/PIER13022801
http://www.jpier.org/PIER/pier.php?paper=13022801

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