Research On Algorithm Of Semi-strapdown Micro Inertial Measuring System

In order to improve measuring accuracy of rotating shells, the North University of Chinahas proposed and designed the semi-strapdown micro inertial measuring system based onMEMS inertial device. In the system, inertial devices are installed within the system, externalsystems associated with the solid-phase missiles, the inside and outside parts are connectedby means to reduce the rotational speed. Angular movement within the system may be in acertain angular frequency range, so the angular motion should be considered when thealgorithms of semi-strapdown inertial measurement system are selected. In this paper,considering the special angular frequency, I calculate the coefficient of attitude solver andnavigation solver.Inner tubes in the semi-strapdown inertial measurement systems measure the pitch andyaw, velocity and position of the carrier. Roll angle of the carrier is drawn by the informationof the inner cylinder and the relative angle of the inner and outer tube. According to theequations of the attack angle, test environment of semi-strapdown inertial measurementsystem is superimposed by fast and slow circular motion, and the algorithm designconsiderations is considered.The attitude information of rotating missile at a time may be affected precious’s, theangular increments of the previous cycle optimization are used to modify the attitudealgorithm. Since the angular motion of semi-strapdown inertial measurement system inspecific frequency range, frequency algorithm optimization principles are used to modifycoefficient of attitude algorithm through the sacrifice of accuracy in low frequency range. Atthe same time, frequency algorithm optimization principles are used to modify coefficient ofvelocity algorithm. The two-sample scrolling compensation algorithms are derived whenposition algorithm is designed. Simulation data of trajectory and information of inertia sensitive devices are generated byMATLAB; use the information of inertial sensing device, compare two optimizationalgorithms through error, and verify the effectiveness of the algorithm design.