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US 6,617,997 B2Granted
Method of determining radio frequency link reliability in an aircraft tracking system
AssigneeAviation Communication & Surveillance Systems LLC
InventorsKathryn W. Ybarra, David J. Johnson
Life of this patent
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Abstract
An aircraft system and method for determining when to attempt acquisition of an intruder for active tracking. A link reliability score associated with the intruder is adjusted based upon the signal strength of transmissions, the frequency of the transmissions, and the number of previous attempts to acquire the intruder for active tracking.
Claims13
A system in a first aircraft for avoiding collision with a second aircraft, the system comprising:
- a. means for receiving first and second signals each identifiable to the second aircraft;
- b. means for adjusting a score toward a threshold value with a first value for the first signal and with a second value for the second signal, the first value being determined in accordance with signal strength of the first signal and the second value being determined in accordance with signal strength of the second signal;
- c. means for adjusting the score away from the threshold value with a third value determined in accordance with a time interval between the first and the second signals;
- d. means for maintaining a track of the second aircraft after the score has crossed the threshold;
- and
- e. means for providing a traffic advisory in accordance with the track, the traffic advisory for alerting a pilot of the first aircraft to avoid collision with the second aircraft.
3 more elements
A method performed in a first aircraft for avoiding collision with a second aircraft, the method comprising:
- receiving first and second signals each identifiable to the second aircraft;
- adjusting a score toward a threshold value with a first value for the first signal and with a second value for the second signal, the first value being determined in accordance with signal strength of the first signal and the second value being determined in accordance with signal strength of the second signal;
- adjusting the score away from the threshold value with a third value determined in accordance with a time interval between the first and the second signals;
- acquiring a track of the second aircraft after the score has crossed the threshold;
- and
- providing a traffic advisory in accordance with the track, the traffic advisory for alerting a pilot of the first aircraft to avoid collision with the second aircraft.
3 more elements
Dependencies are inferred from the claim text.