An air data computer configured to be installed on an aircraft includes an inertial sensor assembly having a plurality of accelerometers and a plurality of rate gyroscopes. The air data computer is configured to: determine a pressure altitude of the aircraft based on measured pressure of the airflow about the exterior of the aircraft; determine an estimated attitude of the aircraft based on rotational rate sensed by the plurality of rate gyroscopes; and determine a vertical acceleration of the aircraft based on the estimated attitude of the aircraft and the acceleration sensed by the plurality of accelerometers. The air data computer is further configured to blend the vertical acceleration and the pressure altitude using a complementary filter to produce a blended altitude rate that is output to consuming systems.

An air data computer configured to be installed on an aircraft includes an inertial sensor assembly having a plurality of accelerometers and a plurality of rate gyroscopes. The air data computer is configured to: determine a pressure altitude of the aircraft based on measured pressure of the airflow about the exterior of the aircraft; determine an estimated attitude of the aircraft based on rotational rate sensed by the plurality of rate gyroscopes; and determine a vertical acceleration of the aircraft based on the estimated attitude of the aircraft and the acceleration sensed by the plurality of accelerometers. The air data computer is further configured to blend the vertical acceleration and the pressure altitude using a complementary filter to produce a blended altitude rate that is output to consuming systems.

An information processing system includes one or more processors, in communication with one or more memories, executing a process including detecting atmospheric pressure surrounding an information processing apparatus; determining a movement state of a movable body by using at least a detection result obtained at the detecting; and determining the movement state of the movable body by a different method from a method used at the determining of the movement state by using at least the detection result, in response to detecting a predetermined change in the detected atmospheric pressure.

An information processing system includes one or more processors, in communication with one or more memories, executing a process including detecting atmospheric pressure surrounding an information processing apparatus; determining a movement state of a movable body by using at least a detection result obtained at the detecting; and determining the movement state of the movable body by a different method from a method used at the determining of the movement state by using at least the detection result, in response to detecting a predetermined change in the detected atmospheric pressure.

A pressure sensor of a mobile device may be corrected by receiving reference pressure information from an associated device. The correction using differential pressure measurements may be influenced by one or more determined condition characteristics.

A method for limiting baro-inertial vertical speed correction, baro-inertial vertical speed being calculated by a baro-inertial loop implemented by a processor included in an airborne system further including an accelerometer and a barometric altimeter, the loop taking a vertical acceleration and a barometric altitude as input and being configured so as: to provide at least one altitude and the vertical speed; to correct the altitude and the vertical speed on the basis of the barometric altitude, a position correction gain, a vertical speed correction gain and a vertical acceleration correction gain. The method includes limiting vertical speed correction when the absolute value of the difference between the barometric altitude and the altitude exceeds a predetermined threshold, the limiting vertical speed correction including modification of the position correction gain.

A method for limiting baro-inertial vertical speed correction, baro-inertial vertical speed being calculated by a baro-inertial loop implemented by a processor included in an airborne system further including an accelerometer and a barometric altimeter, the loop taking a vertical acceleration and a barometric altitude as input and being configured so as: to provide at least one altitude and the vertical speed; to correct the altitude and the vertical speed on the basis of the barometric altitude, a position correction gain, a vertical speed correction gain and a vertical acceleration correction gain. The method includes limiting vertical speed correction when the absolute value of the difference between the barometric altitude and the altitude exceeds a predetermined threshold, the limiting vertical speed correction including modification of the position correction gain.

An ascent rate indicator mechanism includes a first wheel set and a pressure sensor. The first wheel set is connected to the pressure sensor driven in rotation by a pressure variation. The mechanism further includes a second wheel set driven by the first wheel set in a single direction of rotation from a start position into a measurement position corresponding to a decrease in pressure, uncoupling and return structure to be actuated at regular intervals to uncouple the second wheel set and to return it to the start position, an ascent rate display mechanism connected to the second wheel set and including an indicator member arranged to occupy, at each regular interval, a display position representative of the decrease in pressure during the interval, and synchronization structure actuated at each regular interval and arranged to maintain the display position of the indicator member during the regular interval.

A mobile device comprises an atmospheric pressure sensor configured to acquire a value of atmospheric pressure acting on the mobile device, an acceleration sensor configured to acquire a value of acceleration acting on the mobile device, and at least one controller configured to determine a moving state of the mobile device based on the value of atmospheric pressure and the value of acceleration, wherein the at least one controller is configured to determine the moving state of the mobile device based on the value of atmospheric pressure when the value of atmospheric pressure changed per an unit interval is equal to or greater than a threshold value, under the determination result which has been acquired based on the value of acceleration and indicates that the mobile device is not in movement.

A computer implemented method of acquiring and processing autonomous aerial vehicle data comprising obtaining past flight data from an autonomous aerial vehicle; storing the data in a database; conducting netto-variometer calculations to obtain equations to normalize the data; using a filtering technique to normalize the data; storing the equations obtained from the netto-variometer calculations into the database; and using the stored equations and live flight data to generate an optimized sink polar estimate for the autonomous aerial vehicle, wherein the optimized sink polar estimate is to be used in computing netto-variometer during flight.