Wideband Photonic Radar Target Simulator Based on All-Optical IQ Upconverter

IF 4.5 1区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC IEEE Transactions on Microwave Theory and Techniques Pub Date : 2024-09-12 DOI:10.1109/TMTT.2024.3450891

Weile Zhai;Ruihao Wang;Xiaozhe Wang;Fangjing Shi;Xiaoyan Pang;Yongsheng Gao;Wanzhao Cui

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Abstract

Radar target simulator (RTS) is extensively used in the development, debugging, and operation of automotive millimeter-wave radar systems. However, the performance of the traditional RTS based on digital radio frequency memory (DRFM) is limited by the complexity and spurious of radio frequency (RF) front end, the sampling rate of the analog-to-digital converter (ADC), and inherent delays in digital signal processing, which is hard to meet the urgent needs of wide bandwidth, low spurious distortion, high precision, and low delay. To solve this problem, a simple, multiband universal, high precision, and low-spur photonic RTS photonic RTS based on all-optical IQ upconverter is proposed. The experiment shows that the moving direction can be switched by flexible control of up- and down-frequency shifts, and accurate simulation of the target with different speeds can be achieved by a large-range-tunable Doppler frequency shift. In addition, the distance of the target can be flexibly tuned by optical delay, and the radar scattering cross section (RCS) can be simulated by wide-range power attenuation. Due to all-optical operation, the simulator has the advantages of adjustable working frequency (L–K band), large modulation bandwidth (dc to gigahertz level), and high spurious suppression (>30 dB). Moreover, the amplitude and phase of the generated simulated signal can also be adjusted, which is of great value in electronic warfare jamming and forwarding systems.

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基于全光 IQ 上变频器的宽带光子雷达目标模拟器

雷达目标模拟器（RTS）广泛应用于汽车毫米波雷达系统的开发、调试和运行。然而，基于数字射频存储器（DRFM）的传统即时传输系统的性能受到射频前端的复杂性和杂散性、模数转换器（ADC）的采样率以及数字信号处理固有延迟等因素的限制，难以满足宽带、低杂散失真、高精度和低延迟的迫切需求。为了解决这一问题，提出了一种简单、多波段通用、高精度、低杂散的基于全光IQ上变频器的光子RTS。实验表明，通过上下频移的灵活控制可以切换运动方向，通过大范围可调的多普勒频移可以实现对不同速度目标的精确仿真。此外，利用光延迟可以灵活调节目标距离，利用大范围功率衰减可以模拟雷达散射截面（RCS）。由于全光工作，该模拟器具有工作频率可调（L-K波段）、调制带宽大（直流至千兆赫级）和高杂散抑制（>30 dB）等优点。此外，所产生的仿真信号的幅度和相位还可以调节，在电子战干扰和转发系统中具有重要的应用价值。

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来源期刊

IEEE Transactions on Microwave Theory and Techniques 工程技术-工程：电子与电气

CiteScore

8.60

自引率

18.60%

发文量

486

审稿时长

6 months

期刊介绍： The IEEE Transactions on Microwave Theory and Techniques focuses on that part of engineering and theory associated with microwave/millimeter-wave components, devices, circuits, and systems involving the generation, modulation, demodulation, control, transmission, and detection of microwave signals. This includes scientific, technical, and industrial, activities. Microwave theory and techniques relates to electromagnetic waves usually in the frequency region between a few MHz and a THz; other spectral regions and wave types are included within the scope of the Society whenever basic microwave theory and techniques can yield useful results. Generally, this occurs in the theory of wave propagation in structures with dimensions comparable to a wavelength, and in the related techniques for analysis and design.