P14251: Underwater Acoustic Communication
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P14251: Underwater Acoustic Communication Motivation In an attempt to foster student engineers in aquatic engineering problems, Boeing has supported several underwater-robotics related projects. The objective of this project was to send an acoustic signal underwater to achieve a specific data transfer rate out to a certain distance. The primary application would be to send information between two robots or a robot and a surface vessel. Design A 4-FSK modulation scheme was used to transmit the signal over the acoustic channel, using a speaker to output the signal and a hydrophone to read it in. Due to budget constraints, an optimal speaker for this application could not be selected, but the communication scheme was designed to work around this. For the microcontroller, the BeagleBone Black was chosen for its numerous GPIO ports, fast processor, and expansion potential. The underwater housing was made of sheet metal with the front and back plates mounted with screws, nuts and pems. Design Features Mechanical Engineering 8”x6”x6” Watertight Housing Cable Glands for speaker and hydrophone Santoprene Gasket for face plates Parabolic Dish Design Anticipated gain of 15 dB Power Amplifier Heat Sink Electrical Engineering PCB Design 4 Layers Modulation Timer Chip & Pulse Shaping Power System Computer Engineering Demodulation FFT Data Compression 2:1 Error Correction & Detection Reed Solomon Controller Module Communication Protocol CSMA/CA User Interface Customer Dr. Andres Kwasinski Guide Les Moore Team Members Christopher Monfredo (EE) Scott Hambleton (ME) Greg Davis (ME) Christopher Johnson (EE) Jon Holton (CE) System Diagram Engr.Requirement UnitofM easure NominalValue SignalRange m 30 SignalRate kb/s 15 P robability oferrorin signal % <10 B iterrordetection % B iterrorcorrection % Waterresistant/sealed Y/N Y System m ustbe pressure resistant kP a 98 H ousing resists corrosion g/hr N on-naturally occurring underw aterfrequency Y/N Y E ach m odule m usthave receiverand transm itter Y/N Y Low pow errequirem ent W att 15 Engineering Requirements Final Design vs Initial CAD Printed Circuit Board Layout
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P14251: Underwater Acoustic Communication
MotivationIn an attempt to foster student engineers in aquatic engineering problems, Boeing has supported several underwater-robotics related projects. The objective of this project was to send an acoustic signal underwater to achieve a specific data transfer rate out to a certain distance. The primary application would be to send information between two robots or a robot and a surface vessel.
DesignA 4-FSK modulation scheme was used to transmit the signal over the acoustic channel, using a speaker to output the signal and a hydrophone to read it in. Due to budget constraints, an optimal speaker for this application could not be selected, but the communication scheme was designed to work around this. For the microcontroller, the BeagleBone Black was chosen for its numerous GPIO ports, fast processor, and expansion potential. The underwater housing was made of sheet metal with the front and back plates mounted with screws, nuts and pems.
Design FeaturesMechanical Engineering8”x6”x6” Watertight Housing
Cable Glands for speaker and hydrophone Santoprene Gasket for face plates
Parabolic Dish Design Anticipated gain of 15 dB
Power Amplifier Heat Sink
Electrical EngineeringPCB Design
4 LayersModulation
Timer Chip & Pulse ShapingPower System
Computer EngineeringDemodulation
FFTData Compression
2:1Error Correction & Detection
Reed SolomonController ModuleCommunication Protocol
CSMA/CAUser Interface
CustomerDr. Andres Kwasinski
GuideLes Moore
Team MembersChristopher Monfredo (EE)Scott Hambleton (ME)Greg Davis (ME)Christopher Johnson (EE)Jon Holton (CE)
System Diagram
Engr. Requirement Unit of Measure Nominal Value
Signal Range m 30Signal Rate kb/s 15Probability of error in signal % <10Bit error detection %Bit error correction %Water resistant/sealed Y/N YSystem must be pressure resistant kPa 98Housing resists corrosion g/hrNon-naturally occurring underwater frequency Y/N YEach module must have receiver and transmitter Y/N YLow power requirement Watt 15
Engineering Requirements
Final Design vs Initial CAD
Printed Circuit Board Layout
