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Sensors (Basel). 2018 May 7;18(5). pii: E1454. doi: 10.3390/s18051454.

A Range Ambiguity Suppression Processing Method for Spaceborne SAR with Up and Down Chirp Modulation.

Author information

1
Laboratory of spatial information intelligent processing system, Institute of Electronics, Chinese Academy of Sciences, Suzhou 215000, China. xjwen@mail.ie.ac.cn.
2
Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China. xlqiu@mail.ie.ac.cn.
3
Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China. han_bing@mail.ie.ac.cn.
4
Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China. cbding@mail.ie.ac.cn.
5
Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China. leibin@mail.ie.ac.cn.
6
China Center for Resources Satellite Data and Application, Beijing 100094, China. chenq_cn@163.com.

Abstract

Range ambiguity is one of the factors which affect the SAR image quality. Alternately transmitting up and down chirp modulation pulses is one of the methods used to suppress the range ambiguity. However, the defocusing range ambiguous signal can still hold the stronger backscattering intensity than the mainlobe imaging area in some case, which has a severe impact on visual effects and subsequent applications. In this paper, a novel hybrid range ambiguity suppression method for up and down chirp modulation is proposed. The method can obtain the ambiguity area image and reduce the ambiguity signal power appropriately, by applying pulse compression using a contrary modulation rate and CFAR detecting method. The effectiveness and correctness of the approach is demonstrated by processing the archive images acquired by Chinese Gaofen-3 SAR sensor in full-polarization mode.

KEYWORDS:

Chinese Gaofen-3 SAR sensor; range ambiguity suppression; spaceborne SAR

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