Improving FMCW SAR system performance by digital beamforming

Author

Xin Qin ; Wang Zhan ; Jiang ZhiHong ; HuangFu Kan

Author_Institution

Sch. of Electron. Sci. & Eng., Nat. Univ. of Defense Technol., Changsha, China

fYear

2012

fDate

22-27 July 2012

Firstpage

4557

Lastpage

4560

Abstract

According to the limitations of classic Frequency Modulation Continuous Wave (FMCW) Synthetic Aperture Radar (SAR), digital beamforming technology is introduced to improve system performance. The principle of digital beamforming for pulsed SAR is reviewed. The approximation error is computed and then the conventional digital beamforming algorithm is modified to FMCW SAR. Combined with multiple receive apertures, the new FMCW SAR can obtain high resolution in low pulse repetition frequency (PRF), which can increase the processing gain and decrease the sampling frequency. A reference system is also demonstrated in the paper by comparing with a classic FMCW SAR.

Keywords

CW radar; FM radar; array signal processing; synthetic aperture radar; FMCW SAR system performance; PRF; approximation error; classic Frequency Modulation Continuous Wave Synthetic Aperture Radar; digital beamforming technology; low pulse repetition frequency; multiple receive apertures; pulsed SAR; reference system; Array signal processing; Azimuth; Receiving antennas; Signal resolution; Synthetic aperture radar; Transmitting antennas; digital beamforming; frequency modulation continuous radar; synthetic aperture radar;

fLanguage

English

Publisher

ieee

Conference_Titel

Geoscience and Remote Sensing Symposium (IGARSS), 2012 IEEE International

Conference_Location

Munich

ISSN

2153-6996

Print_ISBN

978-1-4673-1160-1

Electronic_ISBN

2153-6996

Type

conf

DOI

10.1109/IGARSS.2012.6350456

Filename

6350456