As a typical navigation system, the strapdown inertial navigation system (SINS) is crucial for autonomous underwater vehicles (AUVs) since the SINS accuracy determines the performance of AUVs. Initial alignment is one of the key technologies in SINS, and initial alignment time and initial alignment accuracy affect the performance of SINS directly. As actual systems are nonlinear, the nonlinear ...

In-flight alignment is an effective way to improve the accuracy and speed of initial alignment for strapdown inertial navigation system (INS). During the aircraft flight, strapdown INS alignment was disturbed by lineal and angular movements of the aircraft. To deal with the disturbances in dynamic initial alignment, a novel alignment method for SINS is investigated in this paper. In this method...

The task of strapdown inertial navigation system (SINS) initial alignment is to calculate the attitude transformation matrix from body frame frame. In this paper, such divided into two parts through introducing inertially fixed as changes corresponding defined can be exactly calculated with known velocity and position provided by GNSS. estimated based on SINS mechanization in attitude, are form...

Abstract This paper proposes a combined initial alignment algorithm for strapdown inertial navigation system, in which the is carried out two stages during process of preflight preparations while aircraft not moving. method has advantages being conducted based on Earth’s equatorial (Greenwich) coordinate also used by onboard system. In first stage, coarse out, and this done according to orienta...

The errors of inertial sensors affect the navigation accuracy of the strapdown inertial navigation system (SINS) and are accumulated over time in nature. In order to continuously maintain the high navigation accuracy of vehicles for a long time period, an initial alignment and self-calibration is necessary after the SINS starts. Additionally, the observability analysis is one of the key techniq...

The majority of homing guided missiles use gimbaled seekers. The equations describing seeker gimbal system are highly nonlinear. Accurate nonlinear control of the motion of the gimbaled seeker through the attached DC motors is required. In this paper, an online technique for finite-horizon nonlinear tracking problems is presented. The idea of the proposed technique is the change of variables th...