Accession Number : ADA017042

Title :   Computer Modeling of Measurement of Winds Beneath Aircraft Using Omega Signal Betransmission.

Descriptive Note : Instrumentation papers,

Corporate Author : AIR FORCE CAMBRIDGE RESEARCH LABS HANSCOM AFB MASS

Personal Author(s) : Morrissey,James F.

Report Date : 23 JUN 1975

Pagination or Media Count : 23

Abstract : The results of a computer model of the problem of measuring wind speed and direction beneath an airplane with retransmitted Omega signals are presented. The model simulates aircraft motion, sonde motion, signal-to-noise variation. Omega timing sequences, and the principal tracking features of the Beukers' WO-3 processing system. This WO-3 processor provides a measurement of the arrival time and signal quality for each of three Omega frequencies for each of four Omega stations. The tracking of only three stations at any one time was simulated. The simulation results are compared to the results of field test data and are found to be in reasonable agreement. The simulation results predict that an improvement in performance is possible for the poor SNR situations (<0 dB) by modifying the tracking algorithms of the processor.

Descriptors :   *Wind, Measurement, Wind direction, Wind velocity, Computerized simulation, Omega navigation, Signals, Dropsondes, Retransmission, Airborne, Tracking

Subject Categories : Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE