模拟中频滤波幅相特性对微波着陆相位信号解算的影响分析

摘要

In the MLS airborne receiver, the C-band RF channel mix the signal into an intermediate frequency. IF signal is fed into the post-processing through the Analog IF filter. The calculation phase information is influenced by Analog IF filter amplitude and phase characteristics, especially the phase characteristics. Reasonable recognition evaluation of the influence of Analog IF filter to the system phase is the basic of design and assess of Analog IF filter. In this paper, the processing theory of the MLS airborne receiver dealing with phase information is introduced. Phase information influenced by Analog IF filter amplitude and phase characteristics is presented by the system perspective and a reference for the design of airborne receiver analog IF filter and the system is given.%在微波着陆机载接收机中，射频通道将C波段信号变换为中频信号，中频信号通过模拟中频滤波器送入到后级处理，模拟中频滤波器的幅相特性特别是相位特性的好坏对后级解算相位信息影响较大，合理的认识评价模拟中频滤波器特性对整机相位信号的影响，是设计与考核模拟中频滤波器的基础。本文介绍了微波着陆机载设备相位信号解算处理通路及原理，并从系统角度给出了模拟中频滤波器特性对与系统相位信号解算的影响，为模拟中频滤波器的设计及系统评价模拟滤波器的性能做出参考。