System and a method of analyzing and monitoring interfering movements of an inertial unit during a stage of static alignment
AssigneeAirbus Helicopters
InventorJean Paul Petillon
Life of this patent
Estimating the term…
Abstract
A system and to a method of analyzing and monitoring interfering movements of an inertial unit of an aircraft during a stage of statically aligning the inertial unit. During the static alignment stage, measurements of the velocity of the aircraft relative to the ground are acquired, and states of a mirror process having a model that is close to the model of the process of aligning the inertial unit are estimated. The states of the mirror process are estimated from observations constituted by the measurements of velocity relative to the ground. Finally, the estimates of the states are compared with respective validation thresholds in order to validate or not validate said alignment of the inertial unit.
Claims19
A method of analyzing and monitoring interfering movements of an inertial unit of an aircraft during a stage of statically aligning the inertial unit, the method being wherein during the stage of statically aligning the inertial unit, the following steps are performed:
- an acquisition step for acquiring measurements of the movement of the aircraft relative to the ground by a movement sensor;
- an estimation step for estimating states of a mirror process of a model that is simplified and/or approximated relative to the model of the static alignment process of the inertial unit, the states of the mirror process being estimated from observations constituted by the movement measurements;
- and
- an additional comparison step comprising comparing data supplied by the inertial unit to detect if interfering movements are present to cause the supplied data to be erroneous;
- if the supplied data is determined to be erroneous, either generate an alignment invalid signal or correct the supplied data in order to make the supplied data supplied usable.
A system for analyzing and monitoring interfering movements of an inertial unit of an aircraft during a stage of statically aligning the inertial unit, the system comprising:
- a movement sensor for sensing movement of the aircraft and supplying measurements of the movement of the aircraft relative to the ground;
- an estimator for estimating a mirror process close to the static alignment process of the inertial unit, the estimator being provided with at least one calculator and with at least one memory storing thresholds for validating the static alignment of the inertial unit and calculation instructions, the estimator serving to estimate states of the mirror process having a model that is close to the model of the static alignment process of the inertial unit, the estimation step of the states of the mirror process being performed on the basis of observations constituted by measurements of movement supplied by the movement sensor,
- wherein data supplied by the inertial unit is used to generate an alignment invalid signal when an estimated state combination is greater than or equal to a global threshold and causing restarting statically aligning the inertial unit.
A method of analyzing and monitoring interfering movements of an inertial unit of an aircraft during statically aligning the inertial unit, the method comprising:
- acquiring measurements of the movement of the aircraft relative to the ground by a movement sensor;
- estimating states of a mirror process of a model that is simplified and/or approximated relative to the model of the static alignment process of the inertial unit, the states of the mirror process being estimated from observations constituted by the movement measurements;
- and
- comparing data supplied by the inertial unit to a threshold to determine if the supplied data is useable;
- if the supplied data is useable, using the supplied data to statically align the inertial unit, if the supplied data is not useable, correcting the data or restarting statically aligning the inertial unit in order to make the data supplied by the inertial unit usable.
A method of analyzing and monitoring interfering movements of an inertial unit of an aircraft during a stage of statically aligning the inertial unit, the method being wherein during the stage of statically aligning the inertial unit, the following steps are performed:
- acquiring measurements of the movement of the aircraft relative to the ground by a movement sensor;
- and
- estimating states of a mirror process of a model that is simplified and/or approximated relative to the model of the static alignment process of the inertial unit, the states of the mirror process being estimated from observations constituted by the movement measurements;
- and
- comparing data supplied by the inertial unit to detect if interfering movements are present to cause the supplied data to be erroneous to determine if the stage of statically aligning the inertial unit with the data supplied by the inertial unit should continue, if the supplied data is useable, statically aligning the inertial unit, if the supplied data is not useable, making the data supplied by the inertial unit usable.
Dependencies are inferred from the claim text.