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arXiv 2004.06047eess.SP
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具有毫米级分辨率的微波光子成像雷达

Microwave Photonic Imaging Radar with a Millimeter-level Resolution

Cong Ma, Yue Yang, Ce Liu, Beichen Fan, Xingwei Ye, Yamei Zhang, Xiangchuan Wang, Shilong Pan

AI总结:

针对现有微波光子雷达分辨率仅厘米级、易与其他射频应用干扰的问题,提出基于光学移频环频率步进chirp信号的毫米级分辨率微波光子成像雷达,实验实现约8.5mm×8.3mm二维分辨率,且可通过自回归算法抗干扰维持高分辨成像。

摘要:

微波光子雷达凭借其宽带宽特性,可实现快速甚至实时的高分辨率成像。然而,这类雷达的频率范围通常会与其他现有射频(RF)应用重叠,且目前已报道的成像分辨率仅为厘米级,不足以满足民用场景的需求。本文中,我们提出一种具备毫米级分辨率的微波光子成像雷达,其核心是引入基于光学移频环的频率步进 chirp 信号。与传统的线性调频(LFM,linear-frequency modulated)信号相比,该频率步进 chirp 信号能为系统带来优异的抗干扰能力。实验中生成了总带宽为18.2 GHz(覆盖16.9 GHz至35.1 GHz)的频率步进 chirp 信号,对雷达回波进行后处理后,实现了二维成像分辨率约为8.5 mm×8.3 mm的雷达成像。当存在频率干扰时,我们采用自回归算法重构受扰信号,可维持高分辨率成像效果。

英文摘要:

Microwave photonic radars enable fast or even real-time high-resolution imaging thanks to its broad bandwidth. Nevertheless, the frequency range of the radars usually overlaps with other existed radio-frequency (RF) applications, and only a centimeter-level imaging resolution has been reported, making them insufficient for civilian applications. Here, we propose a microwave photonic imaging radar with a millimeter-level resolution by introducing a frequency-stepped chirp signal based on an optical frequency shifting loop. As compared with the conventional linear-frequency modulated (LFM) signal, the frequency-stepped chirp signal can bring the system excellent capability of anti-interference. In an experiment, a frequency-stepped chirp signal with a total bandwidth of 18.2 GHz (16.9 to 35.1 GHz) is generated. Postprocessing the radar echo, radar imaging with a two-dimensional imaging resolution of ~8.5 mm$\times$~8.3 mm is achieved. An auto-regressive algorithm is used to reconstruct the disturbed signal when a frequency interference exists, and the high-resolution imaging is sustained.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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