Modified Frequency Scaling Processing Algorithm for Nonlinear FMCW SAR
The combination of compact frequency-modulated continuous wave (FMCW) technology and synthetic aperture radar (SAR) paves a way for the development of the lightweight,cost-effective,high-resolution miniaturized airborne imaging radar.One limiting factor to the use of FMCW SAR sensors is the well-known presence of nonlinearities in the transmitted signal,which highly deteriorates the range resolution and image quality because of the pair-echo effect.Moreover,the so-called stop-and-go approximation for pulsed SAR is no longer valid in FMCW SAR because of the continuous radar motion during the transmission of the relatively long sweep and the reception of the corresponding echo,which will induce serious Doppler frequency shift.A novel modified frequency scaling algorithm is proposed in this paper to compensate this Doppler shift,at the same time effectively correcting the range frequency non-linearity without extra computation load.The validity of the proposed algorithm is demonstrated with point target simulation results.
frequency modulated continuous wave (FMCW) synthetic aperture radar (SAR) frequency scaling nonlinearity
Yu Wen Zhao Siwei Song Xiaoquan
Beijing Institute of Tracking and Telecommunication Technology, Beijing, China
国际会议
2012 IEEE 11th International Conference on Signal Processing (第11届IEEE信号处理国际会议)
北京
英文
1861-1865
2012-10-21（万方平台首次上网日期，不代表论文的发表时间）