Patent ID: 8494761

Claim:
A method for aiding to evaluate a flight trajectory intended to be followed by an aircraft in a constrained environment, the method comprising: A) receiving information with a processing unit from at least one first database containing mobile obstacles and at least one second database containing stationary obstacles relative at least to the environment of the aircraft, determining with the processing unit a plurality of successive points of the flight trajectory, referred to as trial points, and performing the following operations with the processing unit individually for each one of the successive trial points of the flight trajectory: a) estimating the passage time of the aircraft at the trial point being considered; b) extrapolating the positions of the mobile obstacles at the passage time by the first database; and c) implementing at least one collision trial for checking whether a trial vector, being provided perpendicularly to a shifting vector of the aircraft at the trial point, intercepts, on the one hand, mobile obstacles at extrapolated positions at the passage time, and on the other hand, stationary obstacles of the second database, and critical points are determined on opposite sides of the trial point being considered, depending on the result of the collision trial; B) linking together the thus determined critical points so as to form a zone, referred to as a free zone, around the flight trajectory; and C) showing the flight trajectory with a viewing screen of the aircraft, as well as, the free zone allowing to aid to evaluate the flight trajectory.