Method and device for determining a backup altitude of an aircraft

A method for determining a backup altitude of an aircraft, comprising the following steps:

• a first computing step, implemented by a first computational module, comprising computing a first static pressure from an altitude determined by a geolocation module;
• a receiving step, implemented by a reception module, comprising receiving a second static pressure determined by a static pressure sensor;
• a second computing step, implemented by a second computational module, comprising computing a static pressure difference between the second static pressure and the first static pressure;
• a filtering step, implemented by a filtering module, comprising filtering the static pressure difference;
• a third computing step, implemented by a third computational module, comprising computing the backup altitude from the static pressure difference filtered in the filtering step and from the first static pressure computed in the first computing step;
• a sending step, implemented by a sending module, comprising delivering the computed backup altitude to a user device;
• and
• a displaying step, comprising displaying computed backup altitude to a user.