Systems and methods for multi-sensor collision avoidance

1. A collision avoidance system for a host aircraft, comprising:

a plurality of sensors for providing data about other aircraft that may be employed to determine one or more parameters to calculate future positions of the other aircraft;

a processor to determine whether any combinations of the calculated future positions of the other aircraft are correlated or uncorrelated; and

a collision avoidance module that uses the correlated or uncorrelated calculated future positions to provide a signal instructing the performance of a collision avoidance maneuver when a collision threat exists between the host aircraft and at least one of the other aircraft;

wherein the plurality of sensors includes a TCAS and an optical sensor and

wherein the collision avoidance maneuver is a TCAS resolution advisory when (a) one or more future positions calculated by a processor for the TCAS predicts a collision and (b) no other future positions have been determined based on data from the optical sensor.

2. The collision avoidance system of claim 1 wherein the plurality of sensors includes an audio sensor.

3. The collision avoidance system of claim 1 wherein the collision avoidance maneuver is a TCAS resolution advisory when (a) one or more future positions calculated by a processor for the TCAS predicts a collision and (b) one or more future positions have been determined based on data from the optical sensor but the one or more future positions that have been determined based on data from the optical sensor do not correlate to the one or more future positions calculated by the processor for the TCAS and do not predict a collision.

4. The collision avoidance system of claim 1 wherein the collision avoidance maneuver is a TCAS resolution advisory when (a) one or more future positions calculated by a processor for the TCAS predicts a collision and (b) one or more future positions have been determined based on data from the optical sensor that correlate to the one or more future positions calculated by the processor for the TCAS and predict a collision, while a predefined minimum vertical separation is determined to exist.

5. The collision avoidance system of claim 1 wherein the collision avoidance maneuver is a TCAS resolution advisory and a horizontal maneuver when (a) one or more future positions calculated by a processor for the TCAS predicts a collision and (b) one or more future positions have been determined based on data from the optical sensor that correlate to the one or more future positions calculated by the processor for the TCAS and predict a collision, while a predefined minimum vertical separation is determined not to exist.

6. The collision avoidance system of claim 1 wherein the collision avoidance maneuver is a TCAS resolution advisory when (a) one or more future positions calculated by a processor for the TCAS predicts a collision and (b) one or more future positions have been determined based on data from the optical sensor but do not correlate to the one or more future positions calculated by the processor for the TCAS and do predict a collision, while a predefined minimum vertical separation is determined to exist.

7. The collision avoidance system of claim 1 wherein the collision avoidance maneuver is a TCAS resolution advisory and a horizontal maneuver when (a) one or more future positions calculated by a processor for the TCAS predicts a collision and (b) one or more future positions have been determined based on data from the optical sensor but do not correlate to the one or more future positions calculated by the processor for the TCAS and do predict a collision, while a predefined minimum vertical separation is determined not to exist.

8. The collision avoidance system of claim 1 wherein the collision avoidance maneuver is a horizontal maneuver when (a) one or more future positions calculated by a processor for the TCAS do not predict a collision and (b) one or more future positions have been determined based on data from the optical sensor and do predict a collision.

9. The collision avoidance system of claim 1 wherein the signal instructs a pilot to perform the collision avoidance maneuver.

10. The collision avoidance system of claim 1 wherein the signal prompts automatic performance of the collision avoidance maneuver.

11. A method of operating a collision avoidance system for a host aircraft, comprising:

receiving from a plurality of sensors data about other aircraft;

determining from the received data one or more parameters to calculate future positions of the other aircraft;

determining with a processor whether any combinations of the calculated future positions of the other aircraft are correlated or uncorrelated; and

providing with a collision avoidance module that uses the correlated or uncorrelated calculated future positions a signal instructing the performance of a collision avoidance maneuver when a collision threat exists between the host aircraft and at least one of the other aircraft;

wherein the plurality of sensors includes a TCAS and an optical sensor and

wherein the collision avoidance maneuver is a TCAS resolution advisory when (a) one or more future positions calculated by a processor for the TCAS predicts a collision and (b) no other future positions have been determined based on data from the optical sensor.

12. The method of claim 11 wherein the plurality of sensors includes an audio sensor.

13. The method of claim 11 wherein the signal instructs a pilot to perform the collision avoidance maneuver.

14. The method of claim 11 wherein the signal prompts automatic performance of the collision avoidance maneuver.