Accession Number : AD0716823

Title :   Determination of a Hypsometer Performance Function from Airborne Data.

Descriptive Note : Master's thesis,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE MEASUREMENT SYSTEMS LAB

Personal Author(s) : Latron,Patrice Marie

Report Date : FEB 1970

Pagination or Media Count : 175

Abstract : Integrated data from a vertical pendulous integrating gyro accelerometer were used to assess the altitude measuring performance of a hypsometer in an airborne gravimetric installation. Both gravity and Eotvos correction were assumed constant to simplify the integration process. The aircraft-autopilot short period (about 0.044 Hz) longitudinal mode dominates the altitude profile. The hypsometer recordings relative to the integrated accelerometer data showed lags between 2 and 3 seconds, and amplitude ratios between 0.4 and 0.9. A backlash nonlinearity of 3 feet amplitude would explain the varying amplitude ratio but only part of the lag (1 to 2 seconds). The auto-correlation and crosscorrelation functions were used in an attempt to examine the linear behavior of the hypsometer; however, the spread of the data suggested that the nonlinearity was a very significant element in the instrument dynamics. (Author)

Descriptors :   (*HYPSOMETERS, PERFORMANCE(ENGINEERING)), ALTITUDE, MEASUREMENT, PRESSURE, SENSITIVITY, AIRBORNE, ELECTRONIC RECORDING SYSTEMS, ANALOG-TO-DIGITAL CONVERTERS, NUMERICAL INTEGRATION, STATISTICAL FUNCTIONS, COMPUTER PROGRAMS, DATA PROCESSING, THESES

Subject Categories : Meteorology
      Geodesy

Distribution Statement : APPROVED FOR PUBLIC RELEASE