High-resolution 3D imaging by microwave photonic time division multiplexing-multiple-input-multiple-output radar with broadband digital beamforming

IF 1.4 4区管理学 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

Iet Radar Sonar and Navigation Pub Date : 2024-05-24 DOI:10.1049/rsn2.12590

Yuewen Zhou, Fangzheng Zhang, Jiayuan Kong, Shilong Pan

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引用次数: 0

Abstract

A broadband microwave photonic time division multiplexing (TDM) multiple-input-multiple-output (MIMO) radar is proposed in which photonic frequency quadrupling is adopted to generate broadband radar signals and photonic frequency mixing is implemented for de-chirping processing of radar echoes. By utilising two radio frequency switches to control the signal transmission and reception, TDM-MIMO mechanism is formed using a single microwave photonic radar transceiver. This microwave photonic TDM-MIMO radar not only achieves high range resolution using broadband processing but also enables high angular resolution and forward-looking imaging capability with low system complexity. Besides, a broadband digital beamforming (DBF) method is introduced to solve the broadband beam squint and broadening problems and implement near-field correction. In the experiment, a microwave photonic TDM-MIMO radar with an 8×8 T-shape antenna array is established with a bandwidth of 8 GHz (18–26 GHz) in each channel. The range and angular resolutions are estimated to be ∼2 cm and ∼2°, respectively. Applying the broadband DBF method, high-resolution 3D imaging of small targets is achieved with good focusing of targets and deep suppression of grating lobes and side lobes. Hence, the proposed microwave photonic TDM-MIMO radar with broadband DBF provides a promising solution for high-resolution 3D imaging.

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采用宽带数字波束成形的微波光子时分复用多输入多输出雷达的高分辨率 3D 成像技术

本文提出了一种宽带微波光子时分复用（TDM）多输入多输出（MIMO）雷达，采用光子频率四倍频技术生成宽带雷达信号，并通过光子混频技术对雷达回波进行去啁啾处理。通过利用两个射频开关来控制信号的发射和接收，利用单个微波光子雷达收发器形成了 TDM-MIMO 机制。这种微波光子 TDM-MIMO 雷达不仅能利用宽带处理实现高测距分辨率，还能以较低的系统复杂度实现高角度分辨率和前视成像能力。此外，还引入了宽带数字波束成形（DBF）方法，以解决宽带波束斜视和展宽问题，并实现近场校正。在实验中，建立了一个带有 8×8 T 形天线阵列的微波光子 TDM-MIMO 雷达，每个信道的带宽为 8 GHz（18-26 GHz）。测距分辨率和角度分辨率估计分别为 ∼2 cm 和 ∼2°。应用宽带 DBF 方法，可实现小目标的高分辨率三维成像，同时还能很好地聚焦目标，深度抑制光栅裂片和侧叶。因此，所提出的具有宽带 DBF 的微波光子 TDM-MIMO 雷达为高分辨率三维成像提供了一种前景广阔的解决方案。

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来源期刊

Iet Radar Sonar and Navigation 工程技术-电信学

CiteScore

4.10

自引率

11.80%

发文量

137

审稿时长

3.4 months

期刊介绍： IET Radar, Sonar & Navigation covers the theory and practice of systems and signals for radar, sonar, radiolocation, navigation, and surveillance purposes, in aerospace and terrestrial applications. Examples include advances in waveform design, clutter and detection, electronic warfare, adaptive array and superresolution methods, tracking algorithms, synthetic aperture, and target recognition techniques.