论文部分内容阅读
《雷达手册》虽然给出了动目标显示雷达系统设备不稳定对改善因子的限制,以及短期频率稳定度要求最高的稳定本振满足动目标显示改善因子所允许的脉间频偏△f的计算式。但是,△f这一具体指标通常不易测量。工程上常用相位噪声频谱纯度作为稳定本振短期频率稳定度的表征。为此,本文导出了稳定本振的相噪声与其脉间频偏△f的关系式,以及稳定本振高频白相噪声谱对改善因子的限制。从而可以由系统分配的改善因子直接导出稳定本振的相位噪声谱纯度的要求。本文还对机载动目标显示雷达在各种工作模式情况下对频率源短期频率稳定度的要求进行了讨论,给出了近似的计算方法。
Although the Radar Handbook gives the limitation of the improvement factor for instability of the moving target display radar system and the calculation of the stable pulse local oscillator of the short-term frequency stability which is allowed by the moving target display improvement factor formula. However, the specific index △ f is usually not easy to measure. Engineering commonly used phase noise spectrum purity as a stable local oscillator frequency short-term stability of the characterization. For this reason, this paper derives the relationship between the phase noise of the stabilized local oscillator and its inter-pulse frequency deviation Δf, and the limitation of the improvement factor by stabilizing the high-frequency white noise spectrum of the local oscillator. Thus, the requirement of stabilizing the phase noise spectrum of the local oscillator can be directly derived from the system-widened improvement factor. In this paper, the requirements of the short-term frequency stability of the frequency source under various operating modes are also discussed in this paper. The approximate calculation method is given.