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›› 2015, Vol. 32 ›› Issue (1): 91-96.DOI: 10.7523/j.issn.2095-6134.2015.01.015

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Polar format algorithm for multi-mode airborne SAR imaging

LIU Longzhu1,2, WANG Yanfei1   

  1. 1. Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2014-04-01 Revised:2014-04-10 Online:2015-01-15

Abstract:

A high efficiency processing method for mode switch is proposed based on the requirements of airborne synthetic aperture radar (SAR). The features of the mode switch from stripmap to spotlight are well analyzed, and the precise echo signal model during the mode switch is established. By combining the processing steps by means of motion compensation, the polar format algorithm (PFA) is used for the multi-mode imaging. The processing results before and after the mode switch can be shared.Hence the processing efficiency is improved and hardware memory is reduced, which makes the method highly suitable for real-time imaging. Simulation results confirm the validity of the proposed method and show high efficiency.

Key words: synthetic aperture radar (SAR), mode switch, real-time imaging, polar format algorithm (PFA)

CLC Number: