An In-Flight Alignment Method for Global Positioning System-Assisted Low Cost Strapdown Inertial Navigation System in Flight Body with Short-Endurance and High-Speed Rotation

Alignment technology plays an important role in navigation, and is used extensively throughout military civilian applications. However, the existing in-flight alignment methods cannot be applied to low-cost based strap-down inertial navigation system/global positioning system integrated system, short-endurance high-speed rotation flight bodies, since they quickly obtain results meet accuracy requirements of a body with special movement characteristics rotation. In this paper, order solve challenging problem for rotation, fast method on Lie group proposed. First, model vector observations was established by using group. Second, addressing that greatly affected sensor bias, improved unscented Kalman filter constructed basis fully considering equations estimate feedback correlated errors. Finally, trajectory simulation field semi-physical test carried out evaluate proposed method. Evaluation performance comparison state-of-the-art indicated has better faster velocity system.