Accession Number:

ADA522291

Title:

An Examination of the Feasibility of Ultrasonic Communications Links

Descriptive Note:

Final rept. Sep-Nov 2009

Corporate Author:

ARMY RESEARCH LAB WHITE SANDS MISSILE RANGE NM COMPUTATIONAL AND INFORMATION SCIENCE DIRECTORATE

Report Date:

2010-06-01

Pagination or Media Count:

62.0

Abstract:

A study is performed to consider the feasibility of using the ultrasonic band just above the normal adult audio frequency range 20-25 kHz for low data rate signaling. In this band several features of interest are explored and a potential application Identification Friend-or-Foe IFF is highlighted. A key finding is that the data transmission rate is restricted in the presence of multipathing effects. Data transmission rates in the 300-baud range are possible when Rician noise statistics dominate. For non-line-of-sight cases when Rayleigh statistics dominate, a data link may not be possible. However, in the presence of a dominant reflecting path data may be transmittable, but at greatly reduced rates, due to multipathing. To study the potential of this technology a series of measurements were performed to determine signal losses with range, angular emission properties of a series of horns as a function of frequency, and Amplitude Modulation AM and Frequency Modulation FM data encoding methods.

Subject Categories:

  • Acoustic Detection and Detectors
  • Acoustics
  • Radiofrequency Wave Propagation
  • Command, Control and Communications Systems

Distribution Statement:

APPROVED FOR PUBLIC RELEASE