emergency mine radio daniel weller, adam jozwick, david west
TRANSCRIPT
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Emergency Mine Radio
Daniel Weller, Adam Jozwick, David West
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Problem Statement:To build a device for miners to
use in the case of an emergency in a mine.
The solution we decided to pursue was to build a Software Defined Radio (SDR) with an Induction Loop antenna to communicate using low frequencies that pass through solid earth.
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Software Defined Radio A SDR is a radio that swaps out the use of many
hardware components(mixers, filters, detectors) and instead uses software and a PC to implement the same thing. The boards used are called Janus and Magister.
Janus: A/D, D,A Converter Magister: USB interface
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Changes from original designHardware circuit to
generate In-phase and Quadrature
Multi-functionalityVoice based to text
basedSoftware Design
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Software System DiagramTransmit Receive
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EncodingThe user defined text message
is transformed into binary using the ASCII equivalent of letters.
A start(2 in ASCII) and stop (4 in ASCII) bit are also added to help decode the message later.
MATLAB used
a 2,97,4Text Text to ASCII
equivalent
0000010 (2)1100001 (97)0000100 (4)
ASCII to binary equivalent
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ModulateEncoded message is modulated to
on-off keying at low frequency
0000010 (2)1100001 (97)0000100 (4)binary equivalent
(0100000) (1000011) (001000)
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TransmitModulated signal converted from
digital to analog and sent to PC’s audio output
Antenna is in audio output Transmitting
Antenna
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Get DataRadio signal received from other
PC and specifically PowerSDRPowerSDR: Signal Modulation
software for SDR’sSignal converted to vectors
containing values for each data element of signal
SDR
Receiving Antenna
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Signal ProcessingSignal processing is applied to
sampled data from radio signalDC offset removed, passed
through low pass filter and envelope generated.
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DecodeEnvelope of sampled signal used
to generate binary numbers from original signal
From binary converted back to text
a2,97,4
Text ASCII equivalent
0000010 (2)1100001 (97)0000100 (4) binary
equivalent
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SDR
Transmitting Antenna
Receiving Antenna
InputText
Message
OutputText
Message
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Testing
Interface testing –Test used to check communications from Magister to PC
Radio Frequency test -Check if RF signal can be picked up
In-Phase/Quadrature tests – to test the A/D and D/A converters in Janus
Multiple Audio Signals test ASCII Signal Tests – Final text based test with
antenna
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ReflectionA major difficulty was in
understanding of data transmission via radio waves and there limitations
Understanding of SDRs and I and Q were a challenge
Future groups should consider:◦Re-sampling of data◦Other modulation schemes