Method for determining a flight management system rendezvous intercept position
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G05D-001/02
G06F-017/10
G06G-007/78
G08G-001/16
F41G-009/00
출원번호
UP-0158885
(2005-06-22)
등록번호
US-7788034
(2010-09-20)
발명자
/ 주소
Bui, Tien D.
출원인 / 주소
Honeywell International Inc.
대리인 / 주소
Shumaker & Sieffert, P.A.
인용정보
피인용 횟수 :
2인용 특허 :
5
초록▼
One popular military aircraft mission is to meet or rendezvous with another aircraft. Presently used systems have limitations in rendezvous distance, low accuracy of computed rendezvous intercept position, and wrong results in special rendezvous scenarios such in polar regions or on a collision path
One popular military aircraft mission is to meet or rendezvous with another aircraft. Presently used systems have limitations in rendezvous distance, low accuracy of computed rendezvous intercept position, and wrong results in special rendezvous scenarios such in polar regions or on a collision path. The present invention makes use of a numerical algorithm to accurately compute the rendezvous interception position with a preselected tolerance/resolution. The algorithm makes no assumption of angles and uses a proven Sodanos equation to compute a distance between two points on the earth or to compute a second position away from a first position at a known distance and bearing. Using the invention, the rendezvous intercept position can be computed with greater accuracy and a further distance in any region of the globe than the prior art methods and can be used even if the aircraft are in a rendezvous or collision/chasing path.
대표청구항▼
What is claimed is: 1. A method for determining a rendezvous intercept position of a first vehicle and a target vehicle, the method comprising: a) designating an arbitrary point along a projected travel path of the target vehicle as a first intercept position; b) computing a time to travel by the f
What is claimed is: 1. A method for determining a rendezvous intercept position of a first vehicle and a target vehicle, the method comprising: a) designating an arbitrary point along a projected travel path of the target vehicle as a first intercept position; b) computing a time to travel by the first vehicle to the first intercept position; c) comparing the time to travel by the first vehicle to the first intercept position to a time to travel by the target vehicle to the first intercept position; d) determining that the time to travel by the first vehicle differs from the time to travel by the target vehicle by more than a threshold amount; e) designating a different intercept position along the projected travel path of the target vehicle re-computing the time to travel by the first vehicle to the different intercept position, and re-comparing the time to travel by the first vehicle to a time to travel by the target vehicle to the different intercept position; and f) iteratively repeating step e) until a difference of the time to travel by the target vehicle and the time to travel by the first vehicle is less than the threshold amount. 2. The method of claim 1, further comprising performing a non-convergence check between the first vehicle and the target vehicle within a first two iterations of step f). 3. The method of claim 1, wherein designating an intercept position and computing a travel time comprise using a Sodanos equation. 4. The method of claim 1, wherein the threshold amount comprises a predefined convergence window. 5. The method of claim 1, further comprising the step of, prior to designating an arbitrary point, adjusting a position of the target vehicle based on a time difference between the first vehicle and the target vehicle; wherein adjusting comprises matching a time frame of the target vehicle to the first vehicle. 6. The method of claim 5, wherein matching a time frame comprises adjusting a current position of the target vehicle to a projected future position of the target vehicle. 7. The method of claim 5, wherein the step of matching a time frame comprises adjusting a current position of the target vehicle to a projected past position of the target vehicle. 8. The method of claim 1, wherein designating a different intercept position comprises moving the first intercept position in a direction away from the target vehicle along the projected travel path of the target vehicle. 9. The method of claim 1, wherein designating a different intercept position comprises moving the first intercept position in a direction towards the target vehicle along the projected travel path of the target vehicle. 10. A method for determining a flight management system rendezvous intercept position of a first aircraft and a target aircraft, the method comprising: a) designating an arbitrary point along a projected flight path of the target aircraft as a first intercept position; b) computing a time to fly by the first aircraft to the first intercept position with a Sodanos equation; c) comparing the time to fly by the first aircraft to the first intercept position to a time to fly by the target aircraft to the first intercept position; d) determining that the time to fly by the first aircraft is different than the time to fly by the target aircraft by more than a threshold amount; e) designating a different intercept position along the projected flight path of the target aircraft, re-computing the time to fly by the first aircraft with the Sodanos equation, and re-comparing the time to fly by the first aircraft to a time to fly by the target aircraft to the different intercept position; and f) iteratively repeating step c) until a difference of the time to fly by the target aircraft and the time to fly by the first aircraft is less than the threshold amount. 11. The method of claim 10, further comprising performing a non-convergence check between the first aircraft and the target aircraft within a first two iterations of step f). 12. The method of claim 10, wherein the threshold amount comprises a predefined convergence window. 13. The method of claim 10, further comprising, prior to designating an arbitrary point, adjusting a position of the target aircraft based on a time difference between the first aircraft and the target aircraft; wherein adjusting comprises matching a time frame of the target aircraft to the first aircraft. 14. The method of claim 10, wherein designating a different intercept position comprises moving the first intercept position in a direction away from the target aircraft along the projected travel path of the target aircraft. 15. The method of claim 10, wherein designating a different intercept position comprises moving the first intercept position in a direction towards the target aircraft along the projected travel path of the target aircraft. 16. The method of claim 10, further comprising determining the arbitrary point designated as the first intercept position by calculating a collision time for the first aircraft and the target aircraft to meet on a direct collision course; and projecting where the target aircraft will be after a period of time substantially equal to the calculated collision time given its current position, ground speed, and heading. 17. The method of claim 10, further comprising determining the arbitrary point designated as the first intercept position by projecting where the target aircraft will be given its current position, ground speed, and heading after a static predetermined period of time. 18. The method of claim 1, further comprising determining the arbitrary point designated as the first intercept position by calculating a collision time for the first vehicle and the target vehicle to meet on a direct collision course; and projecting where the target vehicle will be after a period of time substantially equal to the calculated collision time given the target vehicle's current position, ground speed, and heading. 19. The method of claim 1, wherein the arbitrary point designated as the first intercept position is determined by projecting where the target vehicle will be given its current position, ground speed, and heading after a static predetermined period of time.
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James A. Frazier ; Kenneth R. Jongsma ; James T. Sturdy, Close/intra-formation positioning collision avoidance system and method.
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