A Fast Damping Algorithm for INS with External Velocity Reference

Under the condition of external velocity reference, a fast damping method is proposed for fast suppression of the oscillation error of inertial navigation system (INS). In the method, traditional damping network structure in INS is changed to accelerate the attenuation of the vibration error. In traditional damping network structure, the internal damping method is easy to be influenced by the vehicle acceleration without external velocity reference, while the external damping method has poor dynamic characteristic. So the imposed method increases a forward channel from external velocity to the damping network to compensate the damping error caused by the vehicle acceleration. According to the dynamic process of system damping, the fast damping network parameters is designed and the turnable parameters are input to the damping network considering the dynamic characteristic and error suppression in the damping process. The simulation and test results show that the settling time of the conventional damping algorithm is about 1 hour, which is shortened to 10 minutes by using the fast damping algorithm with the external velocity reference.