Accession Number : ADP002681

Title :   Utilization of Double Integration Methodology to Determine an Aircraft's Vertical Displacement,

Corporate Author : NAVAL AIR TEST CENTER PATUXENT RIVER MD

Personal Author(s) : Collom,T. A.

Report Date : JUN 1983

Pagination or Media Count : 17

Abstract : In an effort to improve the measurement of the vertical displacement of aircraft which are catapulted off aircraft carriers, an accelerometer based system is being developed. Currently, this measurement is mechanized via camera-based data which is reduced after shipboard tests. This turns out to be a significant problem in terms of rapid buildup in determining aircraft minimums (minimum airspeeds). The basic approach taken is to double integrate a gyro stabilized vertical accelerometer. The resulting package is then incorporated into the subject aircraft's instrumentation system. The displacement data is telemetered and displayed in real time via a portable ground station located aboard the aircraft carrier. The data signal spectrum has significant components roughly around .1 hertz. To minimize drift problems, an AC type integration is employed. Due to the abnormally low data frequencies and the time constants associated with the electronics, analysis of the signals is difficult and time-consuming. Numerous problems exist in the areas of component size, drift, transients, and calibration. This paper will attempt to highlight and solve these problems. (Author)

Descriptors :   *Vertical speed indicators, *Accelerometers, *Aircraft, Catapults, Airspeed, Displacement, Aircraft carriers, Gyro stabilizers

Distribution Statement : APPROVED FOR PUBLIC RELEASE