Accession Number : AD0648264

Title :   PRELIMINARY EXPERIMENTAL STUDY OF EMAC PROBE USING ACOUSTIC SHOCK WAVES AS REFLECTING SURFACES.

Descriptive Note : Final rept., Nov 63-Jan 65,

Corporate Author : BOLT BERANEK AND NEWMAN INC CAMBRIDGE MASS

Personal Author(s) : Allen,Clayton H. ; Weiner,Stepen D.

Report Date : 05 NOV 1965

Pagination or Media Count : 66

Abstract : Preliminary experiments have been made in an attempt to demonstrate the feasibility of reflecting radar from an acoustic shock wave. Tests were conducted using UHF radar (71.5 cm wavelength) to view sonic boom shock waves. However, ground clutter raised the effective noise level and atmospheric turbulence may have roughened the shock front enough to decrease the returned signal level significantly; as a result, no indication of a return identifiable with the sonic boom shock front was observed. It is concluded that the use of Doppler techniques to eliminate clutter and the use of coherent integration to increase the effective signal level are necessary for the success of this EMAC probe technique. Brief theoretical and experimental studies of shock wave sources were conducted. Proposals are presented for further definitive experiments. (Author)

Descriptors :   (*ELECTROMAGNETIC RADIATION, *ACOUSTICS), DOPPLER RADAR, METEOROLOGICAL RADAR, COHERENT RADAR, SONIC BOOM, RADAR CLUTTER, SIGNALS, SHOCK WAVES, FEASIBILITY STUDIES, RADAR REFLECTIONS

Subject Categories : Active & Passive Radar Detection & Equipment
      Acoustics
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE