Cascaded Kalman filters for inertial navigation system error estimation fusing optical and inertial sensors - Sadeghzadeh Nokhodberiz, Nargess; Mekacher, Leila; Wagner, Achim; Nordheimer, Eugen; Poshtan, Javad; Badreddin, Essameddin (International Congress of Condition Monitoring and Diagnostic Engineering Management, 11-13 June, Helsinki, 2013)