面 向 空 间 频 谱 感 知 的 微 波 光 子 时 频 参 数分 析 技 术 综 述

In space applications, spectrum sensing systems can timely identify spectrum holes, perceive electromagnetic spectrum interference, electromagnetic weapon attacks, and active radar detection by analyzing the spectrum usage of the surrounding electromagnetic environment of outer space, and guarantee accurate decision-making and long-term stable operation of our space units. In response to the urgent need for spectrum sensing of large-bandwidth and high-frequency radio frequency signals in future space competition, microwave photonic spectrum sensing solutions have garnered widespread attention due to their ability to overcome the“electronic bottleneck”of conventional electronics-based solutions. By incorporating additional temporal dimension information into microwave photonic frequency measurement, more comprehensive electromagnetic spectrum information in space can be obtained. The research progress of microwave photonic time-frequency analysis techniques are comprehensively summarized, and time-frequency analysis techniques based on multi-period accumulation, time-frequency analysis techniques based on dispersion and frequency-to-time mapping, and time-frequency analysis techniques based on optical frequency sweeping and frequency-to-time-mapping are systematically reviewied. A comparison of the parameter indicators of some typical solutions is conducted. The prospects of microwave photonic time-frequency analysis technology in space applications and photonic integrated circuits are also discussed.