Investigation on the Doppler Compensation in OFDM SAR
Wang Jie①② Liang Xing-dong① Ding Chi-biao① Chen Long-yong① Li Kun①②
①(Science and Technology on Microwave Imaging Laboratory, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China)
②(University of Chinese Academy of Sciences, Beijing 100049, China)
Abstract：The OFDM waveform employed in SAR systems is a novel waveform for Ultra-Wideband (UWB) SAR, which attracts many attentions in recently years. In this paper, the influence of Doppler shift on OFDM SAR is analyzed in terms of ambiguity function. The Doppler shift can not only reduce the pulse compression coefficient of OFDM signals in range, but also affect the focusing quality of SAR systems in azimuth. In order to overcome the restriction of Doppler shift on OFDM SAR systems, a method of Doppler compensation in range Doppler domain is designed. Simulation results demonstrate the effectiveness of the compensation method.
2013, Vol. 35 
