Abstract: An apparatus and computerized method are provided for monitoring the positions of one or more aircraft. The apparatus comprises a first receiver configured to receive first aircraft position information, over a digital data link, from a first radio frequency source located onboard the aircraft at a first period, via one or more ground stations and a second receiver configured to receive second aircraft position information broadcasted from a second radio frequency source located onboard the aircraft at a second period, via one or more ground stations. The apparatus additionally comprises a third receiver configured to receive electronic geographical mapping data and a processor configured to receive the first and second aircraft position information, to filter the quantity of first and second aircraft position information to smooth the filtered information and then output the smoothed information such that it can be overlaid onto the electronic geographical mapping data.

Abstract: An apparatus and computerised method are provided for monitoring the positions of one or more aircraft. The apparatus comprises a first receiver configured to receive first aircraft position information, over a digital data link, from a first radio frequency source located onboard the aircraft at a first period, via one or more ground stations and a second receiver configured to receive second aircraft position information broadcasted from a second radio frequency source located onboard the aircraft at a second period, via one or more ground stations. The apparatus additionally comprises a third receiver configured to receive electronic geographical mapping data and a processor configured to receive the first and second aircraft position information, to filter the quantity of first and second aircraft position information to smooth the filtered information and then output the smoothed information such that it can be overlaid onto the electronic geographical mapping data.