An Improved and Novel De-Ramping Technique for Linear Frequency Modulated Continuous Wave Synthetic Aperture Radar


  • Farhad Arpanaei Young Researcher and Elite Club, Central Tehran Branch, Islamic Azad University, Tehran, Iran
  • Majid Shakeri Young Researcher and Elite Club, Natanz branch, Islamic Azad University, Natanz, Iran
  • Behbod Ghalamkari Computer and Electrical Engineering Department, Science and Research Branch, Islamic Azad University, Tehran, Iran


Fixed Delay De-Ramping Technique, Chirp Signal, Processing Gain, Linear Frequency Modulation, Continuous Wave, Synthetic Aperture Radar,


In this paper, a novel de-ramping technique for linear frequency modulated continuous wave (LFM-CW) synthetic aperture radar (SAR), named as the fixed delay deramping technique is introduced. The received and adaptive fixed delay version of transmitted signals was mixed to increase the processing gain of a system. Furthermore, in this study, the practical mode of de-ramping technique for LFM-CW SAR was considered against the related works assumed as the ideal mode. Similar to this work, the practical mode should consider the desired and undesired part of the de-ramped signal. In addition, the closed form equations for processing gain of the proposed deramping technique were derived. All in all, the simulation section illustrates a substantial improvement of the processing gain of the fixed de-ramping based on the proposed approach in comparison to the conventional methods.


W.-g. Chang and Z.-m. Zhou, "The analysis of UWB SAR system error," in Aerospace and Electronics Conference, 1997. NAECON 1997., Proceedings of the IEEE 1997 National, 1997, pp. 964-969.

C. Clemente and J. J. Soraghan, "Fractional Range Doppler Algorithm for SAR imaging," in Radar Conference (EuRAD), 2010 European, 2010, pp. 248-251.

Z. Jiang, F. Huang, J. Wan, and Z. Cheng, "Modified frequency scaling algorithm for FMCW SAR data processing," Chinese Journal of Aeronautics, vol. 20, pp. 339-345, 2007.

Z.-H. Jiang, K. Huang-Fu, and J.-W. Wan, "A chirp transform algorithm for processing squint mode FMCW SAR data," IEEE Geoscience and Remote Sensing Letters, vol. 4, pp. 377-381, 2007.

A. Meta and P. Hoogeboom, "Development of signal processing algorithms for high resolution airborne millimeter wave FMCW SAR," in IEEE International Radar Conference, 2005., 2005, pp. 326-331.

A. Meta, P. Hoogeboom, and L. P. Ligthart, "Signal processing for FMCW SAR," IEEE Transactions on Geoscience and Remote Sensing, vol. 45, pp. 3519-3532, 2007.

G. Shu-min, C. Zhu, and H. Kan, "Study on imaging algorithm of Dechirped FM-CW SAR," in 2006 CIE International Conference on Radar, 2006, pp. 1-4.

C. Stringham, D. G. Long, B. Wicks, and G. Ramsey, "Digital receiver design for an offset IF LFM-CW SAR," in 2011 IEEE RadarCon (RADAR), 2011, pp. 960-964.

Y. Wang, C. Qu, D. Ping, and B. Chen, "An Improved RD Imaging Algorithm for FMCW SAR," in 2008 4th International Conference on Wireless Communications, Networking and Mobile Computing, 2008, pp. 1-4.

D. Zhu, M. Shen, and Z. Zhu, "Some aspects of improving the frequency scaling algorithm for dechirped SAR data processing," IEEE Transactions on Geoscience and Remote Sensing, vol. 46, pp. 1579-1588, 2008.




How to Cite

Arpanaei, F., Shakeri, M., & Ghalamkari, B. (2016). An Improved and Novel De-Ramping Technique for Linear Frequency Modulated Continuous Wave Synthetic Aperture Radar. Journal of Telecommunication, Electronic and Computer Engineering (JTEC), 8(9), 53–60. Retrieved from