Differential BD/ILS-Glideslope integrated approach system for improving the lateral navigation performance

This paper mainly gives a research about safety landing under the bad flight conditions, to make full use of China´s Beidou Navigation Satellite System which is autonomously controlled by our country to help the most national airports without updating the ground-based radio navigation equipment from Instrument Landing System (ILS) Category I to Category II of the same operational standard. The model of differential BD and ILS-Glideslope integrated approach system is introduced. Kalman filtering is employed to combine the location data of differential DB with ILS. Matlab is used to simulate the approach track of plane, and the result shows that this system can effectively improve the aircraft´s lateral navigation accuracy and the criterion from CAT I to CAT II.