A numerical evaluation is conducted to assess the impact of distributing radio frequency (RF) signals through optical fiber links on the performance of a coherent multi-band multiple-input multiple-output (MIMO) radar system. The analysis focuses on scenarios where the antennas are widely separated in comparison to the employed signal wavelengths. The development of a model to quantify the phase noise (PN) induced on each RF band due to the signal transmission through optical fiber links between the centralized base station and each radar peripheral is described. Monte Carlo simulation results are collected to estimate the key performance indicators (KPIs) for varying standard single-mode fiber (SSMF) length and different PN contributions. The main contributors to the PN are revealed to be chromatic dispersion (CD), double Rayleigh scattering (DRS), and mechanical vibrations. In a shipborne scenario, a significant performance degradation occurs only when the length of the fiber links reaches approximately 20 km. Further, the PN impact has also been studied in a shipborne scenario to analyze the robustness of the system for worse phase noise level assumptions. The results reveal excellent robustness of the proposed centralized acquisition and processing approach in the presence of both very long fiber links and economically employed RF oscillators.

中文翻译：

---

相干多频段 MIMO 雷达：基于 SSMF 的射频信号传输的鲁棒性分析

通过数值评估来评估通过光纤链路分配射频 (RF) 信号对相干多频段多输入多输出 (MIMO) 雷达系统性能的影响。该分析重点关注天线与所使用的信号波长相比相距较远的情况。描述了一种模型的开发，该模型用于量化由于中央基站和每个雷达外围设备之间通过光纤链路传输信号而在每个 RF 频段上引起的相位噪声 (PN)。收集蒙特卡罗模拟结果来估计不同标准单模光纤 (SSMF) 长度和不同 PN 贡献的关键性能指标 (KPI)。研究表明，PN 的主要影响因素是色散 (CD)、双瑞利散射 (DRS) 和机械振动。在船载场景中，只有当光纤链路长度达到约20公里时，才会出现明显的性能下降。此外，还在船载场景中研究了 PN 影响，以分析系统针对更差相位噪声水平假设的鲁棒性。结果表明，在存在很长光纤链路和经济使用的射频振荡器的情况下，所提出的集中式采集和处理方法具有出色的鲁棒性。