Abstract:
Systems and methods for improving the presentation of wake turbulence information. A processor located on an ownship receives position, heading and type information of another aircraft and position and heading information of the ownship. The processor determines if a possible wake condition exists from the other aircraft based on at least a portion of the received information and at least one predefined threshold and generates a wake icon if a wake condition is determined to exist. The wake condition exists when the ownship&#39;s altitude is below a first threshold altitude and above a second threshold altitude, wherein the first and second threshold altitudes are based on the other aircraft&#39;s altitude.

Description:
BACKGROUND OF THE INVENTION 
     An unexpected encounter with wake turbulence can result in possible loss of control, with possible concomitant injury to crew and passengers, typically during all phases of flight. These encounters occur many times every year. 
     In general, the smaller the following aircraft, the larger the disturbance when experiencing a fly through wake situation. There have been fatal accidents in the past, which later resulted in greater aircraft separation standards air traffic authorities. 
     The display of a possible wake turbulence ahead would be a great tool for the pilot. U.S. Pat. No. 7,411,519 granted to Honeywell on Jun. 2, 2002 describes one method to create such a cockpit display. 
     SUMMARY OF THE INVENTION 
     The present invention provides systems and methods for improving the presentation of possible wake turbulence information. A processor located on an ownship receives position, heading and type information of another aircraft and position and heading information of the ownship. The processor determines if a wake condition exists from the other aircraft based on at least a portion of the received information and at least one predefined threshold and generates a wake icon if the wake condition is determined to exist. The wake condition exists when the ownship&#39;s altitude is below a first threshold altitude and above a second threshold altitude, wherein the first and second threshold altitudes are based on the other aircraft&#39;s altitude. 
     In one aspect of the invention, the wake icon includes two or more segments. One of the segments is presented in at least one first color, intensity, pattern, or flash rate and another of the segments is presented in at least one second color, intensity, pattern, or flash rate. 
     In another aspect of the invention, the processor receives from system(s) on the ownship wind information, which uses that information to determine length of at least one segment. 
     In still another aspect of the invention, the length of the segments have one or more predefined values based on at least one of time or distance. 
     In yet another aspect of the invention, the processor determines flight path of the other aircraft based on at least a portion of the received information and receives flight path of the ownship. The wake condition is determined to exist if the other aircraft&#39;s flight path intersects the flight path of the ownship when viewed from a plan view. 
     An objective of the present invention is to give the pilot awareness to only possible pertinent wake turbulence, but to also keep to a minimum clutter on the display of non pertinent wake turbulence. If a pilot sees a wake icon or hears a wake alert, the pilot can contact air traffic control (ATC) or divert from current path. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Preferred and alternative embodiments of the present invention are described in detail below with reference to the following drawings: 
         FIG. 1  is a block diagram of an exemplary system formed in accordance with an embodiment of the present invention; 
         FIG. 2  is a flowchart of an exemplary process performed by the system shown in  FIG. 1 ; 
         FIG. 3  shows a screenshot of an exemplary cockpit display that shows possible wake turbulence of other aircraft; and 
         FIG. 4  is a screen shot of an exemplary display generated by the system shown in  FIG. 1 . 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       FIG. 1  shows a system  22  located on an aircraft  20  for presenting only possible wake turbulence on a display. The system  22  includes a processor  24  that is in signal communication with a position sensor  26 , a communication device  28 , an output device  30  and/or a memory device  32 . 
     The processor  24  receives ownship position/track information from the position sensor  28  and other aircraft information via the communication device  28  and/or memory device  32 . Using the received information, the processor  24  determines if the ownship is at or below an aircraft ahead, then outputs a probable-wake image for the other aircraft. If the ownship is below a lower threshold relative to the aircraft ahead, the no probable-wake image is outputted. 
     In one embodiment, the processor  24  presents the probable wake of the other aircraft on the output device  30 , if the projected own flight path or other aircraft is determined to intersect at the same altitude or below the other aircraft&#39;s altitude. In other words, if the flight paths were viewed in a plan view, they would intersect. 
     In one embodiment, the algorithms are contained in an existing traffic collision-avoidance system (TCAS) computer. ADS-B IN track and altitude of each other aircraft, even those behind the ownship  20  in cruise, are supplied to the TCAS computer (the processor  24 ). 
       FIG. 2  shows an exemplary process  60  performed by the system  22  shown in  FIG. 1 . First at block  64 , the processor  24  receives other aircraft position, heading, speed and type information from the communication device  28 . Next at a decision block  66 , the processor  24  determines if the ownship  20  is behind the other aircraft based on the received other aircraft information and ownship information received from local components (e.g., the position sensor  26 , the memory  32 , the FMS  34 ). If the ownship  20  is not determined to be behind the other aircraft, then the process  60  returns to block  64 . If the ownship  20  is determined to be behind the other aircraft, then the processor  24  determines, at decision block  68 , if the ownship  20  is below a threshold altitude relative to the other aircraft&#39;s altitude (e.g., at other aircraft&#39;s altitude). If the ownship  20  is not below a threshold altitude relative to the other aircraft&#39;s altitude, then the process  60  returns to block  64 . If the ownship  20  is below the threshold altitude relative to the other aircraft&#39;s altitude, then the processor  24  determines, at decision block  70 , if the ownship  20  is below the other aircraft by less than a threshold amount (e.g., 500 feet). If the ownship  20  is below the other aircraft by less than the threshold amount, then at block  72 , the processor  24  generates a wake icon based on the received information and predefined display parameters. The wake icon is displayed on the output device (i.e., display)  30 . 
       FIG. 3  shows an exemplary process  80  performed by the system  22  shown in  FIG. 1 . First at block  82 , the processor  24  receives other aircraft position, heading, speed and type information from the communication device  28 . Next at a decision block  84 , the processor  24  determines the flight path of the ownship  20  and the other aircraft based on the received other aircraft information and ownship information received from local components (e.g., the position sensor  26 , the memory  32 , the FMS  34 ). Next, at a decision block  86 , the processor  24  determines if the flight path of the ownship  20  is going to intersect the flight path of the other aircraft at approximately the same altitude and/or below the altitude of the other aircraft by less than a threshold amount. If the flight path of the ownship  20  is not going to intersect the flight path of the other aircraft at the same altitude and/or below the altitude of the other aircraft by less than the threshold amount, then the process  80  returns to block  82 . If the flight path of the ownship  20  is going to intersect the flight path of the other aircraft at the same altitude and/or below the altitude of the other aircraft by less than the threshold amount, then at block  88 , the processor  24  generates a wake icon based on the received information and predefined display parameters. The wake icon is displayed on the output device (i.e., display)  30 . 
     In one embodiment, the ownship  20  receives wind information from the FMS  34  or from other equipment. The processor  24  uses the wind information to identify position of a wake-turbulence icon relative to an associated other aircraft symbol. 
     In one embodiment, the other aircraft files and application program are contained within or performed by a separate ADS-B IN receiver that drives a navigation-type display. 
     In one embodiment, if the aircraft is above own aircraft by 2,000 feet or greater, the possible wake is not shown. 
       FIG. 4  shows an exemplary navigation/radar display  100 . The display  100  presents processor-generated symbols  110 ,  114  that represent other aircraft that are located in front of the ownship (as indicated by aircraft symbol  104 ). The display  100  also shows symbols  116  that identify a predicted wake possible turbulence for the aircraft associated with the attached aircraft symbol  114 . In this example, only wake symbols are shown for the aircraft symbols  110 ,  114  because the associated aircraft meet one or more of the required conditions as described in  FIGS. 2 and 3 . 
     In one embodiment, the wake symbol (e.g.,  116 ) includes three segments; other number of segments may be used. The first segment located immediately behind the aircraft symbol is considered the most dangerous and is presented in a first color, intensity, pattern and/or flash rate. The other segments are presented at different colors, intensities, patterns and/or flash rates than the first segment. The segments represent a distance (e.g., 2 nautical miles (NM)), a distance associated with a predetermined time value (e.g., 5 minutes for entire wake symbol) or a dynamically determined time value. The distance for one segment maybe different than for other segments. The dynamically determined time value is based on relative speed of the aircraft (other and ownship), wind speed, wind direction and/or altitude. 
     In one embodiment, the received wind value is used for the generation of the wake symbol. For example, the second and third segments of the wake symbol  116  are at angles different than the flight path of the associated aircraft, because either a crosswind has been identified thus causing the predicted wake to be displaced or the aircraft was just previous in a turn. 
     In one embodiment, if the ownship flies into the indentified possible wake turbulence of another aircraft, then the processor  24  outputs an alert to the pilot via the output device, such as an audio, visual or tactile output. In another embodiment, air traffic control (ATC) is advised of the situation where one aircraft is flying into the possible wake of another aircraft. 
     In one embodiment, after alert(s) about flying into the indentified possible wake turbulence have been outputted and the ownship is not longer flying in the indentified possible wake turbulence, the processor  24  outputs information that the aircraft has cleared the indentified possible wake turbulence. 
     In one embodiment, if a comparison between the aircraft type information of the ownship and the other aircraft indicate a certain condition (i.e., the other aircraft is much smaller than the ownship), then the wake image is suppressed (not displayed). 
     While the preferred embodiment of the invention has been illustrated and described, as noted above, many changes can be made without departing from the spirit and scope of the invention. Accordingly, the scope of the invention is not limited by the disclosure of the preferred embodiment. Instead, the invention should be determined entirely by reference to the claims that follow.