Data processing of rocket sled test on inertial measurement unit

Rocket sled test can produce large acceleration, high velocity and strong vibration, and therefore can be used to validate the functionality and accuracy of inertial measurement unit(IMU) in comprehensive environment conditions. The IMU's functional verification tests are conducted on a 3 km rocket-sled track, and overload analysis and vibration level spectrum analysis are made based on the vibration sensor data. The inertial platform system rocket sled test data processing methods are studied, including the separating method for the sled body's overload and vibration data, the differential method for position and speed of light-proof board's electro-optic module, as well as the navigation algorithm of Inertial platform system, etc.. Since the sampling time and observations of exterior measuring system for light-proof board are different to those of strapdown IMU, the paper investigate the data processing methods, including the transformation between post-test observation data, and the comparison of simultaneously obtained data. The data comparison validates the performance and functionality of inertial platform system. This work lay a foundation for the further study on verification of IMU precision and separation of error coefficients.