Accession Number : AD0761085

Title :   Cold-Weather Vehicle Signature Studies.

Descriptive Note : Technical rept. 1 Feb 71-15 Apr 72,

Corporate Author : MICHIGAN UNIV ANN ARBOR INST OF SCIENCE AND TECHNOLOGY

Personal Author(s) : Hand,Robert F.

Report Date : MAY 1972

Pagination or Media Count : 114

Abstract : The report summarizes the results of an acoustics, seismics, and magnetics research program with the fundamental purpose of examining the effects of seasonal changes on vehicle signatures. Primary emphasis is given to the examination of seismic data, since the seasonal effects are more outstanding in these data and not as well understood for that area of physics. The results of the research indicate that road roughness has the most significant effect on the signature of trucks, while the amount of acoustic coupling to the ground has the most significant effect on the signature for tanks. The results also indicate that the presence of a heavy snow layer acted as an acoustic barrier between the sound front and the earth's surface, thus greatly reducing the ground-coupled sound under winter conditions. (Modified author abstract)

Descriptors :   (*VEHICLES, *SPECTRUM SIGNATURES), COLD WEATHER TESTS, SEISMIC WAVES, PERIODIC VARIATIONS, IMAGES, ACOUSTIC SIGNALS, TEST METHODS, DETECTORS

Subject Categories : Surface Transportation and Equipment
      Acoustic Detection and Detectors
      Magnetic & Electric Fld Detection & Detectors
      Seismic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE