AIRCRAFT TRAFFIC WARNING SYSTEM USING AN AD-HOC RADIO NETWORK

• US 20070198142A1
• Filed: 03/26/2007
• Published: 08/23/2007
• Est. Priority Date: 01/26/2005
• Status: Active Grant

• Current Assignee: Extreme Networks, Inc.
• Original Assignee: Symbol Technologies, Inc. (Zebra Technologies Corporation)
• Inventors: WERBACK, Andrew
• Granted Patent: US 7,349,774 B2
• Time in Patent Office: Days
• US Class Current: 701/3
• CPC Class Codes: G08G 5/0008 with other aircraft
• CPC Class Codes: G08G 5/0078 for monitoring traffic from the aircraft radar or analogous systems specially adapted for traffic control G01S13/91
• CPC Class Codes: G08G 5/045 Navigation or guidance aids, e.g. determination of anti-collision manoeuvers radar or analogous systems specially adapted for anti-collision between aircraft G01S13/933
• CPC Class Codes: H04B 7/18506 Communications with or from aircraft, i.e. aeronautical mobile service

Abstract

Methods and apparatus are provided for a traffic warning system (TWS) for light aircraft. The TWS comprises a processor coupled to a transceiver, adapted to measure signal strength and send/receive messages containing station ID and preferably altitude and position data. Memory, display and various flight data instruments, such as GPS, altimeter, etc., are also coupled to the processor. The transceiver-processor automatically identifies TWS equipped aircraft within range using an ad-hoc network and exchanges ID and position information. The processor determines range from signal strength and/or received position information and, given enough data, determines direction, altitude, speed, etc., of the other aircraft, which it presents to the pilot. These values and their rate of change are compared to stored alarm thresholds, and the pilot is warned when another aircraft triggers the threshold. Evasive action is recommended where possible.

Claims

1. A method for tracking aircraft using an airborne traffic warning system (TWS) having inter-coupled transceiver, processor, memory, annunciator and flight status instruments, comprising:

receiving ID and positional information signals from aircraft within communication range;

updating using the received signals, a roster of aircraft whose IDs and positional information are retained in memory from previous receiving steps;

determining proximity of each of the aircraft from the received signals; and

presenting the proximity information to the user via the annunciator.

2. The method of claim 1, further comprising prior to the receiving step:

sending an interrogation signal to the aircraft asking that they report their ID and positional information.

3. The method of claim 1, wherein the determining step comprises:

determining the proximity of each of the aircraft from the positional information in the received signals.

4. The method of claim 1, wherein the determining step comprises:

determining the proximity of each of the aircraft from the strength of the received signals.

5. The method of claim 2, wherein the sending step further comprises:

including in the interrogation signal information on the position of the aircraft sending the interrogation signal.

6. The method of claim 1, wherein the updating step comprises:

adding aircraft whose ID'"'"'s are not already stored in the roster and dropping aircraft whose ID'"'"'s were not included in the last N repetitions of the receiving step, where N≧

1.

7. The method of claim 6, wherein 20≧

N≧

1

8. The method of claim 6, wherein N is determined at least in part by a last stored proximity value for that aircraft.

9. The method of claim 3, further comprising after the determining step:

comparing the positional information with one or more stored positional alarm conditions; and

advising the user via the annunciator when the positional information violates any of the one or more stored positional alarm condition.

10. The method of claim 9, further comprising after the comparing step:

determining a possible evasive action to avoid or relieve the violation of the one or more stored positional alarm conditions.

11. The method of claim 9, further comprising after the comparing step:

determining first whether or not sufficient positional information is available to determine evasive action; and

if not, then proceeding to the advising step; and

if so, then determining second a possible evasive action to avoid or relieve the violation of the one or more stored positional alarm conditions; and

presenting a recommended evasive action to the user.