WIND SHEAR DETECTION AND ALERTING SYSTEM

摘要

A wind shear detection and alerting system (30) compares inertially derived accelerations with air speed rate to provide a wind shear warning signal. Inertially derived accelerations are used instead of purely inertial accelerations because purely inertial systems generally require a vertical gyro. By utilizing angle of attack ( alpha ) and flight path angle ( gamma ) instead of pitch angle ( theta ) in the calculation, no vertical gyro signal is required and the system will be responsive to vertical as well as horizontal shear conditions. An enhanced version of the system is also compensated for roll angle ( phi ), with the roll angle being derived from the rate of change of heading ( PSI ) to avoid the need for a vertical gyro. The alerting system is capable of providing visual and aural warnings for a variety of wind shear conditions, such as, head shear, tail shear, head shear followed by tail shear and wind shear trend. The waring system is also capable of providing a wind shear warning which is a function of the radio altitude of the aircraft.