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概述和总结了数字滤波技术在国外一些轨道检测系统中的应用特点，着重分析了应用于我国轨检车数字信号处理系统中的数字滤波技术，特别是基于数字移变滤波器设计原理，对列车运行速度和运行方向影响检测结果的机理及消除方法做了较为深入的分析和论述。
This paper summarizes and summarizes the application characteristics of digital filtering technology in some track detection systems in foreign countries, and emphatically analyzes the digital filtering technology applied to the digital signal processing system of track inspection vehicles in China. Especially, based on the design principle of digital shift filter, Speed and direction of the test results affect the mechanism and elimination methods do a more in-depth analysis and discussion.