Development Of Track Alignment Irregularity Detecting System Based On FOG

Traditionally, mid-cord offset method and inertial benchmark method are appliedto inspecting cars widely. The two method possess some obvious disadvantage: thedata obstained isn't so accurate and it's performance of repeat is no so good.This paper introduce a track alignment irregularity detecting system based onFOG whose metod is different from conventional mehods. The system consists ofVG951 (fiber optic gyro, FOG), AD620 (low drift, low power instrumentation ampwith set gains of 1 to 10000), AD7714 (24 bits signal conditioning ADC), andP89V51RD (Philips 51 serials MCU, with 64k flash and ISP, IAP function)in whichA/D communicates with MCU using SPI and different MCU communicates withRS232. Combining with the sticking points of its intelligent software such as thedrift trend arithmetic (DTA), digital angular integral and mid-cord offset methodalignment irregularity arithmetic, it can be used to detect the track direction by anglecritically and has a characteristic of low drift and high precision.The researching findings of this paper has applied to engineering,and exercisedgreat contributies to construction of China Railway High-speed and Chian sixthrailways" speedingup.