Accession Number : AD0281705

Title :   SURFACE WIND SAMPLING PERIODS FOR UNGUIDED ROCKET IMPACT PREDICTION,

Corporate Author : ARMY SIGNAL RADIO PROPAGATION AGENCY WHITE SANDS MISSILE RANGE N MEX

Personal Author(s) : Rachele,Henry

Report Date : AUG 1962

Pagination or Media Count : 30

Abstract : Present methods used for obtaining wind measurements for application to unguided rockets involve a horizontal separation between the point(s) of wind measurement and the rocket trajectory. This presents a particular problem of how one best measures the wind, including the type of instruments to be used and the amount of data (sampling interval) to be used. The consequence of instrument selection is brought out in a discussion of the Linear Response Function, whereas the effect of using different sampling intervals is based on the study of the variance of wind differences between two points using different sampling periods which showed that sampling periods on the order of 1-5 minutes are needed, and the correlation between paired frequencies of the wind at the two points using cross-correlation techniques which showed that samples on the order of 5-10 minutes are required. The eddy size distribution of the wind samples used is also presented in tabular form. (Author)

Descriptors :   *ROCKET TRAJECTORIES, *WIND, ATMOSPHERICS, FREQUENCY, INSTRUMENTATION, LINEAR SYSTEMS, SAMPLING, STATISTICAL ANALYSIS, SURFACES

Distribution Statement : APPROVED FOR PUBLIC RELEASE