所属单位：电子信息工程学院

发表刊物：OPTICS EXPRESS

关键字：MICROWAVE WAVE-FORM BANDWIDTH PRODUCT PHASE MODULATION GENERATION SYSTEM

摘要：A photonics-based radar with generation and de-chirp processing of broadband linear frequency modulated continuous-wave (LFMCW) signal in optical domain is proposed for high-resolution and real-time inverse synthetic aperture radar (ISAR) imaging. In the proposed system, a broadband LFMCW signal is generated by a photonic frequency quadrupler based on a single integrated electro-optical modulator, and the echoes reflected from the targets are de-chirped to a low frequency signal by a microwave photonic frequency mixer. The proposed radar can operate at a high frequency with a large bandwidth, and thus achieve an ultra-high range resolution for ISAR imaging. Thanks to the wideband photonic de-chirp technique, the radar receiver could apply low-speed analog-to-digital conversion and mature digital signal processing, which makes real-time ISAR imaging possible. A K-band photonics-based radar with an instantaneous bandwidth of 8 GHz (18-26 GHz) is established and its performance for ISAR imaging is experimentally investigated. Results show that a recorded two-dimensional imaging resolution of similar to 2 cm x similar to 2 cm is achieved with a sampling rate of 100 MSa/s in the receiver. Besides, fast ISAR imaging with 100 frames per second is verified. The proposed radar is an effective solution to overcome the limitations on operation bandwidth and processing speed of current radar imaging technologies, which may enable applications where high-resolution and real-time radar imaging is required. (C) 2017 Optical Society of America

ISSN号：1094-4087

是否译文：否

发表时间：2017-07-10

合写作者：Guo, Qingshui,Wang, Ziqian,周沛,Zhang, Guoqiang,Sun, Jun,潘时龙

第一作者：张方正

通讯作者：张方正,潘时龙