Bearing in mind that the waiting times before landing are always increasing while the maximum landing rates are not reached, the monitoring of one more parameter during the approach is suggested. This is, in fact, two speed corrections and one heading correction (Nav. 4D, 3 space dimension + time). The first problem to be solved is the choice of the mathematical model to be used to simulate a plane. A model as complete as possible (in fact of the 18th order) was the starting point and it was degraded until a criterion was no longer satisfied. This criterion was a measurement of the error between the complete model and the degraded model along a reference trajectory (Roissy approach) of 54 km extension. It was assumed that the error due to the use of a simpler model should not reach + or - 320 m at the ILS entry beacon. A 6th order model was declared acceptable. After a number of simulations it was shown that corrections must arise after the entrance in the zone of convergence (ZOC) during the flight at constant level (speed correction) in the middle of the descent flown at constant indicated speed, (speed correction) and during the last leg before the ILS capture (heading correction). By a management method using a mathematical model on a fast time basis, an optimal time of arrival at the ILS entrance beacon can be determined, corresponding to an easy to fly trajectory. A model of the atmosphere must be used and it was checked that the robustness of the method (3 corrections) with regard to this model is correct. It was also checked that the time when the final beacon is reached is not sensitive to the mass of the plane at the entrance point.
Navigation 4-D en Circulation Aerienne Aircraft 4-D Navigation (Four Dimensional Navigation in Air Traffic with 4-D Navigation Aircraft)
1990
16 pages
Report
Keine Angabe
Englisch
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