The invention relates to a method for automatic detection of turbulence by a second aircraft, by information exchange between the second aircraft and at least a first aircraft. The first aircraft has means for transmitting information and the second aircraft has means for receiving the information t
The invention relates to a method for automatic detection of turbulence by a second aircraft, by information exchange between the second aircraft and at least a first aircraft. The first aircraft has means for transmitting information and the second aircraft has means for receiving the information transmitted by the first aircraft. The method includes the identification of information about turbulence liable to be encountered by the second aircraft, by analyzing the information received from the first aircraft. An alarm is activated on the basis of the turbulence information.
대표청구항▼
1. A method for automatic detection of turbulence by a second aircraft, based on information exchange between the second aircraft and a first aircraft, the first aircraft having encountered turbulence, said method comprising the steps of: transmitting by the first aircraft information including a sp
1. A method for automatic detection of turbulence by a second aircraft, based on information exchange between the second aircraft and a first aircraft, the first aircraft having encountered turbulence, said method comprising the steps of: transmitting by the first aircraft information including a speed and a position of the first aircraft;receiving said information by the second aircraft;analyzing said information by said second aircraft from the first aircraft, said analyzing including: measuring a speed variation Δ of said first aircraft; andcomparing said speed variation Δ with a maximum speed variation threshold Δmax;deducing that said first aircraft is in said turbulence if said maximum speed variation threshold Δmax is exceeded; anddeducing that said second aircraft will encounter said turbulence encountered by the first aircraft, and activating an alarm proportional to said speed variation Δ if said first aircraft is located ahead said second aircraft. 2. The method as claimed in claim 1, wherein said analyzing further comprises analyzing by the second aircraft a horizontal speed of the first aircraft in order to detect turbulence. 3. The method as claimed in claim 1, wherein said analyzing further comprises analyzing by the second aircraft a vertical speed of the first aircraft in order to detect turbulence. 4. The method as claimed in claim 1, wherein said analyzing further comprises analyzing by the second aircraft horizontal and vertical speeds of the first aircraft in order to detect turbulence. 5. The method as claimed in claim 1, further comprising calculating a first horizontal speed difference ΔVi in absolute value on the basis of a first horizontal speed measurement Vi taken at a first time ti, and of a second horizontal speed measurement Vi+1 taken at a second time ti+i, wherein the alarm is activated after confirmation of said measurements, and said calculating includes the steps of:initiating at least a third horizontal speed measurement Vi+2 at a third time ti+2;calculating at least a second speed difference ΔVi′ in absolute value on the basis of the first horizontal speed measurement Vi taken at the first time ti and of the third horizontal speed measurement Vi+2 at the third time ti+2,comparing the horizontal speed differences in absolute value with a threshold ΔVmax; andactivating the alarm if all the horizontal speed differences in absolute value are above the threshold ΔVmax. 6. The method as claimed inclaim 1, further comprising calculating a first vertical speed difference ΔVzi in absolute value on the basis of a first vertical speed measurement Vzi taken at a first time t, and of a second vertical speed measurement Vzi+i taken at a second time ti+i, wherein the alarm is activated after confirmation of said measurements, and said calculating includes the steps of:initiating at least a third vertical speed measurement Vzi+2 at a third time ti+2;calculating at least a second vertical speed difference ΔVzi′ in absolute value on the basis of the first vertical speed measurement Vzi taken at the first time ti and of the third vertical speed measurement Vzi+2 at the third time ti+2,comparing the vertical speed differences in absolute value with a threshold ΔVzmax; andactivating the alarm if all the vertical speed differences ΔVzi′ in absolute value are above the threshold ΔVzmax. 7. The method as claimed in claim 1, further comprising calculating a first rms (root means square) speed difference ΔVqi from a first measurement of the horizontal speed Vi and vertical speed Vzi taken at a first time t, and from a second measurement of the horizontal speed Vi+1 and vertical speed Vzi+1 taken at a second time ti+1, wherein the alarm is activated after confirmation of said measurements, and said calculating includes the steps of:calculating the first rms speed difference ΔVqi, said first rms difference satisfying the following equation: ΔVqi=√{square root over ((Vi+1−Vi)2+(Vzi+1−Vzi)2)}{square root over ((Vi+1−Vi)2+(Vzi+1−Vzi)2)},initiating at least a third measurement of the horizontal speed Vi+2 and vertical speed Vzi+2 at a third time ti+2;calculating at least a second rms speed difference ΔVqi′ from the first measurement of the horizontal speed Vi and vertical speed Vzi taken at the first time ti and from the third measurement of the horizontal speed Vi+2 and vertical speed Vz2+2 at the third time ti+2, said second rms difference satisfying the following equation: ΔVq′i=√{square root over ((Vi+2−Vi)2+(Vzi+2−Vzi)2)}{square root over ((Vi+2−Vi)2+(Vzi+2−Vzi)2)},comparing the rms speed differences with a threshold ΔVqmax; andactivating the alarm if the rms speed differences are above the threshold ΔVqmax. 8. The method as claimed in claim 1, further comprising calculating a first horizontal acceleration difference γi from a first horizontal speed measurement Vi taken at a first time ti and from a second horizontal speed measurement Vi+1 taken at a second time ti+1, wherein the alarm is activated after confirmation of said measurements, and said calculating includes the steps of:calculating the first horizontal acceleration difference γi said first difference satisfying the following equation: γi=(Vi+1−Vi)/(ti+1−ti),initiating at least a third horizontal speed measurement Vi+2 at a third time ti+2;calculating at least a second horizontal acceleration difference γi′ from the first horizontal speed measurement Vi taken at the first time ti and from the third horizontal speed measurement Vi+2 at the third time ti+2, said second difference satisfying the following equation: γi′=(Vi+2−Vi)/(ti+2−ti),comparing the horizontal acceleration differences with an acceleration threshold γmax; andactivating the alarm if the horizontal acceleration differences are above the acceleration threshold γmax. 9. The method as claimed in claim 1, further comprising calculating a first vertical acceleration difference γi from a first vertical speed measurement Vzi taken at a first time ti and from a second vertical speed measurement Vzi+1 taken at a second time ti+1, wherein the alarm is activated after confirmation of said measurements, and the calculating includes the steps of:calculating the first vertical acceleration difference γi, said first difference satisfying the following equation: γi=(Vzi+1−Vzi)/(ti+1−ti),initiating at least a third vertical speed measurement Vzi+2 at a third time ti+2;calculating at least a second vertical acceleration difference γi′ from the first vertical speed measurement Vzi taken at the first time ti and from the third vertical speed measurement Vzi+2 at the third time ti+2, said second difference satisfying the following equation: γi′=(Vzi+2−Vzi)/(ti+2−ti),comparing the vertical acceleration differences with an acceleration threshold γmax; andactivating the alarm if the vertical acceleration differences are above the acceleration threshold γmax. 10. The method as claimed in claim 1, further comprising calculating a first rms acceleration difference γqi from a first measurement of the horizontal speed Vi and vertical speed Vzi taken at a first time ti and from a second measurement of the horizontal speed Vi+1 and vertical speed Vzi+1 taken at a second time ti+1, wherein the alarm is activated after confirmation of said measurements, and said calculating includes the steps of:calculating the first rms acceleration difference γqi, said first rms acceleration difference satisfying the following equation: γqi=(Vi+1-Vi)2+(Vzi+1-Vzi)2(ti+1-ti),,initiating at least a third measurement of the horizontal speed Vi+2 and vertical speed Vzi+2 at a third time ti+2;calculating at least a second rms acceleration difference γqi′ from the first measurement of the horizontal speed Vi and vertical speed Vzi taken at the first time ti and from the third measurement of the horizontal speed Vi+2 and vertical speed Vzi+2 at the third time ti+2, said second rms acceleration difference satisfying the following equation: γqi′=(Vi+2-Vi)2+(Vzi+2-Vzi)2(ti+2-ti),,comparing the rms acceleration differences with a threshold γqmax, andactivating the alarm if the rms acceleration differences are above the threshold γqmax. 11. The method as claimed in claim 1, further comprising a step of inhibiting the alarm. 12. The method as claimed in claim 11, wherein the step of inhibiting the alarm is initiated if the airplane is already in a flight configuration appropriate to flight under turbulent conditions. 13. The method as claimed in claim 11, wherein the step of inhibiting the alarm is initiated manually by the pilot. 14. The method as claimed in claim 1, wherein the alarm includes information including an expected time of encountering the turbulence detected and its intensity. 15. The method as claimed in claim 1, wherein the information transmitted from the first aircraft to the second aircraft further include altitude and path of the first aircraft, and wherein said step of analyzing said information by the second aircraft is to determine whether the latter is liable to encounter the turbulence signaled by the first aircraft and to reject the turbulence information coming from the first aircraft if the latter lies beyond the short-term horizon of the second aircraft. 16. An automatic turbulence detection device for implementing the method as claimed in claim 1, comprising an acquisition unit, an analysis unit, an alarm unit and a man-machine interface which includes a display means and control knobs placed on either side of said display unit, wherein said man-machine interface includes for a unit configured for signaling that turbulence has been detected. 17. The automatic turbulence detection device as claimed in claim 16, further comprising a transmission system of the first aircraft which is an ADS-B Out type. 18. The automatic turbulence detection device as claimed in claim 17, further comprising a reception system of the second aircraft which is an ADS-B In type. 19. The automatic turbulence detection device as claimed in claim 18, further comprising a transmission system of the second aircraft which is an ADS-B Out type so as to transmit turbulence information to another aircraft. 20. The automatic turbulence detection device as claimed in claim 16, wherein display characteristics of the alarm are parameterized according to an expected time of encountering the turbulence detected and its intensity.
Daniel L. Woodell ; Roy E. Robertson ; Ying C. Lai, Method and system for detecting turbulence with reduced errors resulting from vertical shear components.
Gordon Andrew A. (5193 Woodley Ave. Encino CA 91436), System for detecting and viewing aircraft-hazardous incidents that may be encountered by aircraft landing or taking-off.
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