面向滤波器预失真的导航信号监测技术

摘要

Navigation transmitter channel has some non-idealities, these non-idealitiesresult distortion in navigation signal, pre-distortion technology realizes navigation signal quality improvement through compensating non-idealities of channel. Filter is a very important non-ideal device in the channel, it's amplitude-frequency and group delay bring linear distortion to navigation signal, through analyzing amplitude spectrum and phase spectrum of distortion signal we can realize the monitor of the filter distortion characteristics. The pre-distortion unit uses the non-idealities monitored to change the filter parameter and compensate the distortion resulted by filter in the channel effectivel.%导航发射信道存在一定的非理想特性，这些非理想特性会给导航信号带来失真，预失真技术通过补偿信道的失真特性来实现导航信号质量的改善。滤波器是信道中非常重要的非理想器件，它的幅频、群时延特性会给导航信号引入线性失真，通过分析失真信号的幅度谱和相位谱实现对滤波器失真特性的实时监测，预失真单元可以根据监测得到的非理想特性改变滤波器参数，从而达到有效补偿信道中滤波器引入失真的效果。