Abstract:

One of the key problems of the design of airborne low level windshear detection , alter and avoidance system is the risk estimation critertion of low windshear to aircraft flight. This paper develops theoretically suck a criterion by energy height analysis main risk is caused bythe horizontal windshear acceleration U_wg, and vertical wind velocity W_wg. The quantitativeand qualitative relationship between, U_wg, Wwg and the risk criterion are studied in detail. Itis also attempted to estimate the risk of low level windshear to aircraft flight safety based only on the detectable windshear parameter U_wg. This provides the basis for the development oflook-forward windshear detection sensors.

Key words: low level windshear, risk critertion, energy height