Initial Alignment Of Strap-down Inertial Navigation System On Stationary Base For High-Speed Flying Vehicle

Abstract

The initial alignment of the Inertial Navigation Systems (INS) has significant importance in recent years. It is needed to ensure the accuracy and reliability of the system. For the initial alignment of Strap-down INS (SINS), Navigation Mathematical Software (NMSW) implements an efficient technique. These techniques provide a solution for navigation problems such that the inertial velocity, and coordinate estimation in addition to the inertial sensor’s calibration. In this paper, the navigation algorithm for the closed-loop system is modified to feedback continuously in alignment. The NMSW is testing, and a typical trajectory is calculated based on the block diagram of the hardware-in-the-loop (HIL) flight simulation. Results show that the initial calculated variance setting of Azimuth angle error will significantly affect the speed of the initial alignment. The process of simulation and computation is highlighted related to the trajectory simulator data from the equation of motions of the high-speed flying vehicle.