Accession Number : ADD004437

Title :   Constant Altitude Auto Pilot Circuit.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Watson,William S

Report Date : 20 Sep 1977

Pagination or Media Count : 3

Abstract : A constant altitude auto pilot circuit samples an altitude electronically and produces error output voltages proportional to the changes in altitude which are used to command the control system of an aircraft. To set the device, the plane obtains the desired altitude whereafter the device is activated. A switch in parallel with an op-amp is closed to charge a capacitor to a voltage level proportional to the output of a transducer. When the switch is opened, all inputs to the op-amp become relative to the charge of the capacitor. Any variation is amplified by the op-amp. Additional inputs allow biasing the altitude signal up or down or introducing a damping signal for control loop stability. (Author)

Descriptors :   *Patents, *Altitude controllers, *Automatic pilots, Aircraft equipment, Flight control systems, Signal processing, Circuit analysis

Subject Categories : Flight Control and Instrumentation

Distribution Statement : APPROVED FOR PUBLIC RELEASE