仪表着陆信号发生器校准研究

仪表着陆信号发生器是仪表着陆系统机载设备的专用检测设备，目前国内还没有公开发布的关于仪表着陆信号发生器的国家或行业范围内的检定/校准技术标准。本文通过对仪表着陆系统原理进行剖析，从仪表着陆信号发生器工作特点入手，对航向信标、下滑信标、指点信标等信号特点进行分析，给出了计量特性，并基于频谱分析仪直接测量法给出了各项计量特性的校准方法，同时对频谱分析仪引入的测量不确定度进行了分析，用GUM法评定了扩展不确定度。结果表明，给出的校准方法可满足仪表着陆信号发生器关键参数的校准需求，使用频谱分析仪校准符合仪表着陆信号发生器各计量特性的量值溯源要求。

Research on calibration of instrument landing signal generator

Instrument landing signal generator is special testing equipment for the airborne equipment of instrument landing system. At present, there is no publicly published national and industrial technical standards for verification and calibration of instrument landing signal generator in China. By analyzing the principle of instrument landing system, and starting from the working characteristics of instrument landing signal generator, this paper analyzes the signal characteristics of localizer, glide path beacon and marker beacon, gives the measurement characteristics, and presents the calibration method of each measurement characteristic based on direct measurement method of spectrum analyzer. The uncertainty of measurement introduced by spectrum analyzer is analyzed, and the extended uncertainty is evaluated by GUM method. The results show that the calibration method presented in this paper can meet the calibration requirements of the key parameters of the instrument landing signal generator, and the calibration with spectrum analyzer meets the traceability requirements of the measurement characteristics of instrument landing signal generator.