基于微波光子学的分布式相参孔径雷达

李尚远; 肖雪迪; 郑小平

doi:10.12000/JR19024

基于微波光子学的分布式相参孔径雷达

doi: 10.12000/JR19024

清华大学电子工程系，北京信息科学与技术国家研究中心北京 100084

基金项目: 国家自然科学基金(61690191, 61690192, 61420106003, 61621064)

详细信息

作者简介:
李尚远(1982–)，男，博士，清华大学电子工程系助理研究员，研究方向为微波光子学。E-mail: syli@mail.tsinghua.edu.cn

肖雪迪(1993–)，女，清华大学电子工程系博士生，研究方向为基于微波光子学的分布式相参雷达。E-mail: xxd15@mails.tsinghua.edu.cn

郑小平(1965–)，男，博士，清华大学电子工程系教授，研究方向为微波光子学、光网络与光通信。E-mail: xpzheng@mail.tsinghua.edu.cn

通讯作者:
郑小平　xpzheng@mail.tsinghua.edu.cn

中图分类号: TN957.51
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出版历程
- 收稿日期: 2019-02-17
- 修回日期: 2019-04-02
- 网络出版日期: 2019-04-01

Distributed Coherent Aperture Radar Enabled by Microwave Photonics

Department of Electronic Engineering, Beijing National Research Center for Information Science and Technology, Tsinghua University, Beijing 100084, China

Funds: The National Natural Science Foundation of China (61690191, 61690192, 61420106003, 61621064)

More Information

Corresponding author: ZHENG Xiaoping, xpzheng@mail.tsinghua.edu.cn

摘要

摘要: 分布式相参孔径雷达(DCAR)是利用多个空间分离的天线孔径，向同一区域辐射信号，实现空间电磁波相参合成的雷达系统，具有系统灵活、探测分辨力高、威力大、成本低等优势。结合微波光子技术在宽带信号产生、传输、处理等多方面的优势，可以使DCAR的性能得以充分发挥。该文介绍了清华大学在基于微波光子原理的高分辨DCAR方面的成果，借助微波光子技术，在接收相参模式下，产生了8.5～11.5 GHz, 0.5 Gbps编码速率的宽带正交调相线性调频波，距离分辨率优于0.05 m、正交性接近30 dB。在全相参模式下，发射波形可灵活切换为宽带相参线性调频波，实现全相参合成。系统产生的波形能满足DCAR各个工作模式的波形需求。实验中，在两部雷达的参与下，通过全相参合成，获得了8.3 dB的信噪比增益。
- 微波光子学 /
- 分布式相参 /
- 雷达
Abstract: Distributed Coherent Aperture Radar (DCAR) utilizes multiple separated antenna apertures to emit signals in the same space area, realizing spatial coherent synthesis of electro-magnetic waves. Such a flexible radar system has advantages such as higher resolution, greater radar power, and lower cost. Combined with microwave photonic technologies, which have merits in wideband signal generation, transmission and procession, the DCAR has a comprehensive and better performance. This paper introduces a microwave photonics-based high-resolution distributed coherent aperture radar that was proposed by researchers of Tsinghua University. Taking advantages of microwave photonic technology, a group of wideband orthogonal phase-coded linear frequency modulation waves is generated in the coherence-on-receive mode, with the frequency ranging from 8.5 GHz to 11.5 GHz, all with phase coding under a bit rate of 0.5 Gbps. The orthogonality of the signals is nearly 30 dB, and the range resolution is better than 0.05 m. While in the full coherence mode, the transmitted waveforms can be flexibly switched to the wideband coherent linear frequency modulation waves, and the full coherent synthesis can be realized. The waveforms generated by the proposed system can meet the waveform requirements of the DCAR in different operation modes. In the experiment, full coherence is achieved with two sets of radars, resulting a signal- to-noise ratio gain of 8.3 dB.
- Microwave photonics /
- Distributed coherent aperture /
- Radar

HTML全文

图 1 分布式相参孔径雷达原理图^[6]

Figure 1. Schematic diagram of the Distributed Coherent Aperture Radar^[6]

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图 2 基于微波光子学原理的DCAR总体架构

Figure 2. The overall framework of the microwave photonics-based DCAR

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图 3 基于光子学的宽带DCAR系统

Figure 3. Schematic diagram of the photonic-based wideband DCAR system

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图 4 相位编码模块

Figure 4. Configuration of the phase coding module

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图 5 PCLFMW与LFMW的自相关和互相关结果

Figure 5. Auto-correlation and cross-correlation of the PCLFMW and LFMW

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图 6 雷达1和雷达2接收回波匹配滤波结果

Figure 6. The matched-filtering results of radar 1 and radar 2 receiving echo wave

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图 7 雷达1和雷达2匹配滤波的结果(蓝色/红色：发射相参模式/单发单收模式)

Figure 7. The matched-filtering results of radar 1 and radar 2 (Blue/red line: coherence-on transmit mode/monostatic mode)

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图 8 雷达1和雷达2匹配滤波的结果(蓝色/红色：全相参模式/单发单收模式)

Figure 8. The matched-filtering results of radar 1 and radar 2 (Blue/red line: full coherence mode/monostatic mode)

下载: 全尺寸图片幻灯片

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