Title :
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
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;
Conference_Titel :
Geoscience and Remote Sensing Symposium (IGARSS), 2012 IEEE International
Conference_Location :
Munich
Print_ISBN :
978-1-4673-1160-1
Electronic_ISBN :
2153-6996
DOI :
10.1109/IGARSS.2012.6350456
