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

被引：11
|
作者：
Wen, Xuejiao [1 ]
Qiu, Xiaolan [2 ]
Han, Bing [2 ]
Ding, Chibiao [2 ]
Lei, Bin [2 ]
Chen, Qi [3 ]
机构：
[1] Chinese Acad Sci, Lab Spatial Informat Intelligent Proc Syst, Inst Elect, Suzhou 215000, Peoples R China
[2] Chinese Acad Sci, Inst Elect, Beijing 100190, Peoples R China
[3] China Ctr Resources Satellite Data & Applicat, Beijing 100094, Peoples R China
来源：
SENSORS | 2018年 / 18卷 / 05期
基金：
美国国家科学基金会;
关键词：
range ambiguity suppression; spaceborne SAR; Chinese Gaofen-3 SAR sensor; ALGORITHM; TARGETS; POINT;
D O I：
10.3390/s18051454
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
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.
引用
收藏
页数：15
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