Broadband LFM radar imaging system based on microwave photonic I/Q de-chirping

被引：0
作者：
Yang Y. [1 ]
Ye X. [1 ]
Zhang F. [1 ]
Pan S. [1 ]
机构：
[1] Key Laboratory of Radar Imaging and Microwave Photonics, Ministry of Education, Nanjing University of Aeronautics and Astronautics, Nanjing
来源：
Journal of Radars | 2019年 / 8卷 / 02期
基金：
中国国家自然科学基金;
关键词：
I/Q receiver; Linear frequency modulated signal; Microwave photonic radar; Microwave photonics;
D O I：
10.12000/JR19002
中图分类号：
学科分类号：
摘要：
We propose a novel scheme of broadband LFM radar imaging system based on microwave photonic I/Q de-chirping. In the transmitter, a broadband linear frequency modulated signal is generated by photonic frequency-doubling. In the receiver, echoes reflected from the target are simultaneously sent to a couple of modulators in two polarization states. After the bias voltage of the corresponding modulator is adjusted to introduce a 90° phase difference, photonic I/Q de-chirping reception of radar echoes is achieved. The proposed radar is capable of real-time high-resolution detection and can distinguish the target on both sides of a reference point. The range ambiguity problem caused by image interference in current radar with photonic de-chirping reception is solved. In this study, first, the necessity of I/Q de-chirping is demonstrated. Then, the structure and principle of the proposed photonic-based radar are introduced. A K-band radar with a bandwidth of 8 GHz is established, and an experiment on target detection and inverse synthetic aperture radar imaging is conducted. Results show that the system can effectively suppress the interference from image frequencies. © 2019 Institute of Electronics Chinese Academy of Sciences. All rights reserved.
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收藏
页码：224 / 231
页数：7
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