An Examination of the Feasibility of Ultrasonic Communications Links
Final rept. Sep-Nov 2009
ARMY RESEARCH LAB WHITE SANDS MISSILE RANGE NM COMPUTATIONAL AND INFORMATION SCIENCE DIRECTORATE
Pagination or Media Count:
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.
- Acoustic Detection and Detectors
- Radiofrequency Wave Propagation
- Command, Control and Communications Systems