Aim at the route deformation of rail state, a non-contact dynamic detection method based on trap-down inertial technology, was studied. Further study on integrated acceleration and real-time update of attitude matrix was made to put forward a proper solution. By experimental verification, this method is feasible and the error is within 5mm.

This paper describes the software of the track state inspection system based on LABVIEW, which includes serial communication, data extraction, strap-down algorithm, acceleration integral and saving the results. Serial communication module uses VISA to program in order to realize communication between the IMU (inertial measurement unit)and upper computer. According to the output data format, data extraction module separates the signal of three axes’ accelerations and angular-rates by Match Pattern Function. Strap-down algorithm and acceleration integral modules are programmed by Math Script. The measurement results are saved by Write to Spreadsheet File Function. Finally, it’s to design a convenient humanized operation interface.