This work is concerned with the application of high-quality flight dynamics models to GNSS-denied navigation of airplanes with low-cost sensors. A study of system theory points to advantageous characteristics of aided low-cost inertial navigation and airplane aerodynamic motion propagation in GNSS-denied flight but also reveals drawbacks of each model operating alone. This work therefore proposes an innovative covariance-free integration of the two models. The new method is tested in Monte Carlo simulation and applied to real flight data in postprocessing.
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