用于高分辨率探测和成像的具有光学注入半导体激光器的无RF源微波光子雷达
An RF-source-free microwave photonic radar with an optically injected semiconductor laser for high-resolution detection and imaging
摘要：
本文提出了一种新的微波光子（MWP）雷达方案，能够光学产生和处理宽带线性调频（LFM）微波信号，而不使用任何射频（RF）源。在发射机中，通过控制光注入半导体激光器的周期一（P1）振荡来产生宽带LFM微波信号。目标反射后，利用双驱动马赫-曾德尔调制器（DMZM）实现光子去啁啾，并通过低速模数转换器（ADC）和数字信号处理器（DSP）重构目标信息。该雷达不受外部射频源的限制，具有超灵活的可调谐性，主要工作参数可调，包括中心频率、带宽、频段和时间周期。在实验中，建立了一个完全基于光子学的Ku波段雷达，带宽为4 GHz的高分辨率检测和逆合成孔径雷达（ISAR）成像。结果表明，在100 MSa/s的采样率下，该接收机的距离分辨力可达1.88 cm，二维成像分辨力可达1.88 cm × 2.00 cm。实验研究了该雷达的柔性可调谐性。该方案具有成本低、结构简单、可重构性强等特点，有望应用于未来的多功能自适应、小型化雷达。
英文摘要：
This paper presents a novel microwave photonic (MWP) radar scheme that is capable of optically generating and processing broadband linear frequency-modulated (LFM) microwave signals without using any radio-frequency (RF) sources. In the transmitter, a broadband LFM microwave signal is generated by controlling the period-one (P1) oscillation of an optically injected semiconductor laser. After targets reflection, photonic de-chirping is implemented based on a dual-drive Mach-Zehnder modulator (DMZM), which is followed by a low-speed analog-to-digital converter (ADC) and digital signal processer (DSP) to reconstruct target information. Without the limitations of external RF sources, the proposed radar has an ultra-flexible tunability, and the main operating parameters are adjustable, including central frequency, bandwidth, frequency band, and temporal period. In the experiment, a fully photonics-based Ku-band radar with a bandwidth of 4 GHz is established for high-resolution detection and inverse synthetic aperture radar (ISAR) imaging. Results show that a high range resolution reaching ~1.88 cm, and a two-dimensional (2D) imaging resolution as high as ~1.88 cm x ~2.00 cm are achieved with a sampling rate of 100 MSa/s in the receiver. The flexible tunability of the radar is also experimentally investigated. The proposed radar scheme features low cost, simple structure, and high reconfigurability, which, hopefully, is to be used in future multifunction adaptive and miniaturized radars.
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。
