提升发射信号频谱纯度、降低相位噪声是现代机载雷达追求的目标, 基于光电谐振腔的微波光子本振源直接产生的高频本振信号相噪水平明显优于传统微波本振源。 当前对微波光子本振源环境适应性研究较少,同时机载雷达的工作环境极其苛刻,这将对微波光子本振源迈向实用化造成阻碍。文中从微波光子本振源相位噪声基本原理出发,对振动环境中的微波光子本振源相噪水平进行了理论分析和数值模拟,建立了微波光子本振源相噪受振动影响的经验公式,最后通过振动试验验证相关相噪理论的有效性,并结合试验结果分析了微波光子本振源的改进方案。这些工作为机载雷达微波光子本振源的工程应用奠定了良好的基础。

Improvement of the spectral purity, thus reduction of the phase noise of transmitting signal is a target of the modern airborne radar. Based on optoelectronic oscillator, a microwave-photonic local oscillator source provides much more pure signal than a traditional microwave local oscillator. There are quite few researches on the vibration response of the microwave-photonic local oscillator source, while the environmental suitability of the airborne radar is extremely strict, which will reduce the practicality of microwave-photonic local oscillator source. This paper gives theoretical analysis and numerical simulation of the phase noise of the microwave-photonic local oscillator source in the vibrating environment. An empirical formula is constructed to describe its vibration response and verified by comparing the theoretical and experimental results. This work provides improvement direction of the microwave-photonic local oscillator source and has laid a good foundation of its engineering application.

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