FORMATION SURVEILLANCE AND COLLISION AVOIDANCE

• US 20030016159A1
• Filed: 07/20/2001
• Published: 01/23/2003
• Est. Priority Date: 07/20/2001
• Status: Active Grant

• Current Assignee: L-3 Communications Corporation (L3Harris Technologies, Inc.)
• Original Assignee: Aviation Communication and Surveillance Systems LLC (L3Harris Technologies, Inc.)
• Inventors: Troxel, James R., Ybarra, Kathryn W., Stayton, Greg T.
• Granted Patent: US 6,657,578 B2
• Time in Patent Office: Days
• US Class Current: 342/30
• CPC Class Codes: G08G 5/0008 with other aircraft
• CPC Class Codes: G08G 5/0052 for cruising combined instruments indicating more than one navigational value G01C23/00

Abstract

A formation collision avoidance system includes a Traffic Alert and Collision Avoidance System (TCAS) having a passive mode and an active mode. The passive mode enables several members of an aircraft formation to fly without actively interrogating using TCAS while only one or few formation members are actively interrogating. Formation members in passive mode maintain awareness of current air and ground traffic conditions using networked surveillance information provided over a communications link between formation members in active mode and formation members in passive mode. The networked surveillance information includes positional and intent information of current air/ground traffic obtained from ADS-B broadcasts and replies to the actively interrogating members of the formation. The communications link utilizes Station Keeping Equipment (SKE) already existing on certain aircraft.

Claims

1. An airborne surveillance and collision avoidance system comprising:

a transponder;

a surveillance and collision avoidance module communicatively coupled to the transponder, the module comprising a processor for generating traffic display information and performing collision avoidance calculations to evaluate possible collisions, and a first transceiver coupled to the processor; and

a second transceiver communicatively coupled to the module and operative to transmit and receive networked surveillance information to and from aircraft in a formation;

wherein said module includes at least two modes of operation, an active mode that enables the first transceiver to transmit interrogation signals and receive replies in response to interrogation signals, and a passive mode that disables the first transceiver from transmitting interrogation signals and enables continued surveillance using the networked surveillance information received by the second transceiver.

2. The system of claim 1 further comprising a display for displaying traffic display information generated by the processor.

3. The system of claim 2 wherein the processor generates traffic display information relating to surrounding formation and non-formation aircraft.

4. The system of claim 1 wherein the first transceiver operates on a different frequency than the second transceiver.

5. They system of claim 1 wherein the second transceiver comprises a Station Keeping Equipment (SKE) transceiver.

6. The system of claim 5 wherein the module comprises a Traffic Alert and Collision Avoidance System (TCAS) receiver/transmitter unit.

7. The system of claim 1 wherein the processor performs collision avoidance calculations based on information received by the second transceiver.

8. The system of claim 3 wherein the display comprises an integrated display unit that presents in visual format, the traffic display information relating to formation and non-formation aircraft generated by the processor.

9. The system of claim 1 wherein the networked surveillance information comprises data relating to an identification and position of nearby formation and non-formation aircraft.

10. The system of claim 9 wherein the data comprises at least one of, SKE data, Automatic Dependent Surveillance Broadcast (ADS-B) data and interrogation reply data.

11. The system of claim 1 wherein the processor is configured to generate a first alarm signal when a potential collision with a non-formation aircraft is detected and a second alarm signal when a potential collision with a formation aircraft is detected.

13. The method of claim 12 wherein performing traffic surveillance comprises, sending an interrogation signal to aircraft within a proximity, and receiving a reply from proximate aircraft.

14. The method of claim 12 wherein transmitting further comprises communicating navigational information relating to a position of the interrogating aircraft, to the non-interrogating aircraft.

15. The method of claim 12 wherein determining the potential collision threat comprises, calculating a position of the non-interrogating aircraft relative to the interrogating aircraft;

and comparing the calculated relative position to the transmitted surveillance information.

16. The method of claim 15 further comprising, issuing a first warning when the potential collision threat is determined for a collision with a non-formation aircraft, and issuing a second warning when the potential collision threat is determined for a collision with formation aircraft.

17. The method of claim 12 wherein the surveillance information comprises at least one of SKE data, Automatic Dependent Surveillance Broadcast (ADS-B) data and interrogation reply data.

18. The method of claim 16 wherein the first warning comprises one of a traffic alert and a resolution advisory and the second warning comprises a blunder alert.

19. The method of claim 18 wherein when the first warning is the resolution advisory, the non-interrogating aircraft begins interrogating.

12. A method for tracking aircraft and avoiding collisions in a multiple aircraft formation, wherein at least one aircraft of the formation is interrogating and at least one aircraft in the formation is not interrogating, the method comprising:

performing traffic surveillance by the interrogating aircraft to obtain surveillance information regarding nearby aircraft;

transmitting the surveillance information from the interrogating aircraft to the non-interrogating aircraft; and

determining a potential collision threat, by the non-interrogating aircraft, based on the transmitted surveillance information.

20. An apparatus for surveying air traffic and avoiding collisions between aircraft comprising:

a first transceiver including a processor operative to perform airspace surveillance and intruder tracking, the first transceiver having an active surveillance mode and passive surveillance mode;

a second transceiver in communication with the processor and operative to transmit surveillance information to formation aircraft when the first transceiver is in the active surveillance mode and receive surveillance information from formation aircraft when the first transceiver is in the passive mode.

21. The apparatus of claim 20 wherein the first and second transceivers operate on different frequencies.

22. The apparatus of claim 20 wherein the second transceiver comprises an SKE receiver/transmitter.

24. The method of claim 23 wherein the networked surveillance information comprises SKE data and interrogation reply data.

25. The method of claim 23 wherein the networked surveillance information further comprises Automatic Dependent Surveillance Broadcast (ADS-B) data.

26. The apparatus of claim 20 wherein the second transceiver comprises an ADS-B transmitter/receiver unit.

23. A method of performing passive surveillance and collision avoidance by an aircraft in a formation wherein the formation includes at least one interrogating aircraft that provides networked surveillance information over a communications link between aircraft of the formation, the method comprising:

monitoring identification and position of non-formation aircraft and formation aircraft using the networked surveillance information;

updating a traffic display to reflect the monitored non-formation and formation aircraft identifications and positions;

generating an advisory if any non-formation aircraft penetrate a threshold value of distance or time to distance; and

generating a blunder alert if any formation aircraft penetrate a threshold formation distance or a relative acceleration threshold.

27. A system for tracking aircraft and avoiding collisions in a multiple aircraft formation, wherein at least one aircraft of the formation is interrogating and at least one aircraft in the formation is not interrogating, the system comprising:

means for performing traffic surveillance by the interrogating aircraft to obtain surveillance information;

means for transmitting the surveillance information from the interrogating aircraft to the non-interrogating aircraft; and

means for determining a potential collision threat, by the non-interrogating aircraft, based on the transmitted surveillance information.