Abstract: An analysis is given of the shortcomings of the air craft course ( at titude) analogue ser vo system: complicate in construction, difficult to form a complete set , of low r eliability, expensive ,and difficult to raise its accuracy. Then a new construction model of “computer plus detector ”system is presented. The advantage of this project is that the servo and filter function is achieved by the computer, and all sorts of errors can be cor rected accurately.

Key words: servomechanisms, courses, filtering