Directly modulated sonobuoy transmitter using surface acoustic w

Details Directly modulated sonobuoy transmitter using surface acoustic w Directly modulated sonobuoy transmitter using surface acoustic w

1980-09-11

1982-02-09

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Transponders

Sonobuoys and sonobuoy systems

367149, 367164, H04B 159

Patent

active

043153240

ABSTRACT:
Serving as a hydrophone in the lower unit of the sonobuoy, two surface acoustic wave resonators for determining the resonant frequency of two independent oscillators are also used to sense pressure and thus sound. The outputs of the two resonators are mixed and then passed through a low pass filter to provide a low frequency hydrophone output signal and to remove temperature induced signal distortion. A line driver and low cost twin lead transmission line provides the signal to the upper floatation electronic unit of the sonobuoy for conversion to the desired RF carrier frequency. In a single-channel sonobuoy, this signal is multiplied and amplified for transmission to a distant receiver. In a multi-channel sonobuoy, this signal acts as a reference frequency for the frequency synthesizer section of the sonobuoy transmitter.

REFERENCES:
patent: 3875548 (1975-04-01), Acks
patent: 3878477 (1975-04-01), Dias et al.
A Surface Acoustic Wave Sonobuoy by P. Das et al., Electrical and Systems gineering Dept., Rensselaer Polytechnic Institute, Troy, NY, ten pages written material, nine pages of drawing figures.

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