Research on Strapdown Inertial Navigation and Laser Doppler Combination Navigating Algorithm

Abstract

In the current strapdown inertial navigation system, there are errors in the calculation model set by the airborne computer and the accuracy of related equipment, and the errors accumulate over time, which will lead to lower navigation accuracy and larger speed deviation. In order to solve the above problems, a new integrated navigation algorithm is proposed in this paper, which takes strapdown inertial navigation system as the main body and calculates the velocity and attitude of the aircraft. Laser Doppler assisted velocity measurement system is used as the auxiliary navigation system to correct and eliminate the velocity error of strapdown inertial navigation system. At the same time, Kalman filter technology is used to modify the velocity data of integrated navigation system. The simulation results show that the integrated navigation algorithm can reduce the speed error and improve the navigation accuracy, which verifies the effectiveness and feasibility of the integrated navigation algorithm.