Process and device for estimating at least the vertical speed of an aircraft, in particular of a rotary wing aircraft

A device for estimating at least the vertical speed of an aircraft, in particular of a rotary wing aircraft, said device (1A, 1B, 1C, 1D) comprising:

• a first means (2) for measuring a vertical acceleration of the aircraft;
• a second means (3A, 3B) for carrying out a barometric measurement;
• a third means (4A, 4B, 4C, 4D) for forming a component from the difference between a first value incorporating said barometric measurement and a second value incorporating an estimation of the vertical speed;
• a fourth means (5) for carrying out the sum of said measured vertical acceleration and of said component;
• and
• a fifth means (6) for integrating said sum in such a way as to form the vertical speed to be estimated,
• wherein it furthermore comprises a sixth means (8A, 8B, 8C, 8D) for clipping said difference by eliminating, as appropriate, the part of said difference which is greater, in absolute value, than a predetermined value (ΔVmax, ΔZmax).