LOW EARTH ORBIT SATELLITE FOR AIR TRAFFIC CONTROL

Abstract

The present invention relates to low earth orbit satellites for air traffic control. One or more LEO satellites serves as a link between a control tower and an aircraft. The one or more LEO satellites are adapted for a) receiving an Automatic Dependent Surveillance-Broadcast, ADS-B, signal from an aircraft; b) receiving and/or transmitting a signal from/to a control tower; and c) receiving and/or transmitting a VHF signal from/to an aircraft.

Claims

1. A method for using a low earth orbit, LEO, satellite for air traffic control comprising the steps of: a) receiving, with a LEO satellite, an Automatic Dependent Surveillance-Broadcast, ADS-B, signal from an aircraft; wherein the ADS-B signal emitted by the aircraft comprises information regarding the aircrafts position, speed, and direction; b) relaying, with a LEO satellite, said information to a control town; c) receiving, with a LEO satellite, a signal from a control tower; and d) retransmitting said signal, with a LEO satellite, on a compensated VHF frequency for compensating for Doppler frequency shifts, and wherein the compensation is based on the information from the aircrafts ADS-B signal.

2. A method according to claim 1, wherein the LEO satellite in step d) retransmits the signal to an aircraft at a narrow transmission bandwidth of 8.33 kHz in regions where aviation VHF channels are operated with nominally 25 kHz separation.

3. A method according to claim 2, wherein the region is identified by the information from the aircrafts ADS-B signal.

4. (canceled)

5. A method according to claim 1, wherein a LEO satellite retransmits the ADS-B signal and/or the VHF signal from an aircraft to another LEO satellite in a position closer to a control tower.

6. A method according to claim 1, wherein the LEO satellite retransmits the signal from a control tower to another LEO satellite in a position closer to an aircraft.

7. A system (100) for air traffic control comprising: one or more LEO satellites (110) adapted for: a) receiving an Automatic Dependent Surveillance-Broadcast, ADS-B, signal from an aircraft (10); b) receiving and/or transmitting a signal from/to a control tower (120); c) receiving and/or transmitting a VHF signal from/to an aircraft (10); wherein the ADS-B signal emitted by the aircraft (10) comprises information regarding the aircrafts position, speed, and direction; one or more control towers (300) adapted for receiving and/or transmitting a signal from/to a LEO satellite; wherein the LEO satellite is further adapted for receiving a signal from a control tower, and to re-transmit said signal to an aircraft on a compensated VHF frequency for compensating for Doppler frequency shifts, and wherein the compensation is based on the information from the aircrafts ADS-B signal.

8. A system for air traffic control according to claim 7, wherein the LEO satellite is further adapted for receiving a signal from a control tower, and to re-transmit said signal to an aircraft at a narrow transmission bandwidth of 8.33 kHz in regions where aviation VHF channels are operated with nominally 25 kHz separation.

9. A system for air traffic control according to claim 8, wherein the region is identified by the information from the aircrafts ADS-B signal.

10. A system for air traffic control according to claim 7, wherein the LEO satellite is further adapted for re-transmitting the ADS-B signal and/or the VHF signal from an aircraft to another LEO satellite in a position closer to a control tower.

11. A system for air traffic control according to claim 7, wherein the LEO satellite is further adapted for: detecting a VHF signal from an aircraft; correcting for Doppler frequency shifts; and re-transmitting said VHF signal to a control tower.

12. A system for air traffic control according to claim 7, wherein the LEO satellite is further adapted for re-transmitting the signal from a control tower to another LEO satellite in a position closer to an aircraft.

13. A LEO satellite for air traffic control, the LEO satellite being adapted for: a) receiving an Automatic Dependent Surveillance-Broadcast, ADS-B, signal from an aircraft; b) receiving and/or transmitting a signal from/to a control tower; c) receiving and/or transmitting a VHF signal from/to an aircraft; wherein the ADS-B signal emitted by the aircraft comprises information regarding the aircrafts position, speed, and direction; wherein the LEO satellite is further adapted for receiving a signal from a control tower, and to re-transmit said signal to an aircraft on a compensated VHF frequency for compensating for Doppler frequency shifts, and wherein the compensation is based on the information from the aircrafts ADS-B signal.

14. A LEO satellite for air traffic control according to claim 13, wherein the LEO satellite is further adapted for receiving a signal from a control tower, and to re-transmit said signal to an aircraft at a narrow transmission bandwidth of 8.33 kHz in regions where aviation VHF channels are operated with nominally 25 kHz separation.

15. A LEO satellite for air traffic control according to claim 14, wherein the region is identified by the information from the aircrafts ADS-B signal.

16. A LEO satellite for air traffic control according to claim 15, wherein the LEO satellite is further adapted for re-transmitting the ADS-B signal and/or the VHF signal from an aircraft to another LEO satellite in a position closer to a control tower.

17. A LEO satellite for air traffic control according to claim 13, wherein the LEO satellite is further adapted for: detecting a VHF signal from an aircraft; correcting for Doppler frequency shifts; and re-transmitting said VHF signal to a control tower.

18. A LEO satellite for air traffic control according to claim 13, wherein the LEO satellite is further adapted for re-transmitting the signal from a control tower to another LEO satellite in a position closer to an aircraft.

Description

BRIEF DESCRIPTION OF THE FIGURES

[0047] FIG. 1 shows a system for air traffic control in accordance with various embodiments of the invention; and

[0048] FIG. 2 shows a LEO satellite for air traffic control in accordance with various embodiments of the invention.

DETAILED DESCRIPTION OF THE INVENTION

[0049] The general aspects of the invention is described in the following as a solution to optimize air traffic control in busy sectors. The system is capable of obtaining contact with an aircraft in due time before the aircraft reaches the sector.

[0050] A schematic view of a system 100 for air traffic control in accordance with various embodiments of the invention is shown in FIG. 1. The system comprises one or more satellites 110 and a control tower 120.

[0051] The one or more LEO satellites 110 are adapted for receiving an Automatic Dependent Surveillance-Broadcast, ADS-B, signal from an aircraft. The ADS-B signal emitted by the aircraft comprises information regarding the aircrafts position, speed, and direction. This information may be relayed directly to the control tower 120, or may be relayed to another LEO satellite, and then to the control tower 120. This information is important for the control tower 120 for them to plan the flight profiles for the aircraft that is about to enter a given sector.

[0052] The pilot needs to be informed about any changes in his flight plan. Thus, in order to inform the pilot in good time, the LEO satellites 110 are also adapted for receiving and/or transmitting a signal from/to a control tower; as well as adapted for receiving and/or transmitting a VHF signal from/to an aircraft.

[0053] The one or more control towers 120 should also be adapted for receiving and/or transmitting a signal from/to a LEO satellite 110.

[0054] In FIG. 2, a LEO satellite for air traffic control is shown.

[0055] The LEO satellite 110 comprises:

a) means 118 for receiving an Automatic Dependent Surveillance-Broadcast, ADS-B, signal from an aircraft 10;
b) means 116 for receiving and/or transmitting a signal from/to a control tower 120; and
c) means 112 for receiving and/or transmitting a VHF signal from/to an aircraft.

[0056] The LEO satellite 110 is also shown comprising means 114 for receiving and/or transmitting a signal from/to another LEO satellite.

[0057] The means 112 for transmitting a VHF signal to an aircraft is configured for transmitting on a compensated VHF frequency for compensating for Doppler frequency shifts, and wherein the compensation is based on the information from the aircrafts ADS-B signal.

[0058] The means 112 for transmitting a VHF signal to an aircraft is also configured for transmitting a signal to an aircraft at a narrow transmission bandwidth of 8.33 kHz in regions where aviation VHF channels are operated with nominally 25 kHz separation. This will minimize the interference of the signal.

REFERENCES

[0059] 10 Aircraft [0060] 100 System [0061] 110 LEO satellite [0062] 112 Means for receiving and/or transmitting a VHF signal from/to an aircraft [0063] 114 Means for receiving and/or transmitting a signal from/to another LEO satellite [0064] 116 Means for receiving and/or transmitting a signal from/to a control tower [0065] 118 Means for receiving an ADS-B signal from an aircraft [0066] 120 Control tower