DocumentCode :
1936922
Title :
On the use of fractional autocorrelation to correct mismatches for chirp scale focusing for real SAR image formation
Author :
Northrop, Judith ; Papandreou-Suppappola, Antonia
Author_Institution :
Sch. of Electr., Comput. & Energy Eng., Arizona State Univ., Tempe, AZ, USA
fYear :
2011
fDate :
6-9 Nov. 2011
Firstpage :
2084
Lastpage :
2088
Abstract :
The fractional Fourier transform (FrFT) was shown to be an effective signal processing technique in many synthetic aperture radar (SAR) applications, and most recently, it was used to enhance the focusing capabilities of the chirp scaling algorithm (CSA). We propose the use of the fractional autocorrelation function in a local optimization procedure to detect mismatches in the fast-time linear frequency-modulated rate and correct these mismatches with the FrFT before CSA processing. Additionally, we enhance slow-time processing with the FrFT in order to maximize the contrast of targets in each range-bin. As we will demonstrate using SAR images, this processing increase SAR image quality.
Keywords :
FM radar; Fourier transforms; chirp modulation; correlation methods; radar imaging; synthetic aperture radar; chirp scale focusing; fast time linear frequency modulated rate; focusing capability; fractional Fourier transform; fractional autocorrelation function; mismatch correction; real SAR image formation; signal processing; slow time processing; synthetic aperture radar; Azimuth; Chirp; Focusing; Fourier transforms; Frequency modulation; Signal to noise ratio; Time frequency analysis;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Signals, Systems and Computers (ASILOMAR), 2011 Conference Record of the Forty Fifth Asilomar Conference on
Conference_Location :
Pacific Grove, CA
ISSN :
1058-6393
Print_ISBN :
978-1-4673-0321-7
Type :
conf
DOI :
10.1109/ACSSC.2011.6190395
Filename :
6190395
Link To Document :
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