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SDP 11 CDR Team Goeckel
Group: Adebayo Adeyemi, Joseph Hayward, Mark Kohls, Simon McAuliffe
Advisor:Dennis Goeckel
CDRKeeping The Secret
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2SDP 11 CDR Team Goeckel
Brief Overview
Step 1: Send test signal to desired
radio.
Step 2: RX radio sends back reply signal. Friends measure this
signal strength.
Step 3: TX radio sends out
message. Friends not in range
transmit noise.
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3SDP 11 CDR Team Goeckel
System Requirements
Battery life of at least 12 hours Receive and transmit Operate while walking Operate up to 300 meters.
• Receive signal with 95% success rate. Voice Transmission Bandwidth Maintain secure communications
• Less than 10% interception rate Handheld and less than 2lbs.
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4SDP 11 CDR Team Goeckel
Software Requirements
RX Radio
RX Radio
RX Radio
TX Radio
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5SDP 11 CDR Team Goeckel
Radio Diagram
Antenna
Receiver
Transmitter
Microcontroller
Microphone
Speaker
Transceiver
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6SDP 11 CDR Team Goeckel
Schematic
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7SDP 11 CDR Team Goeckel
PCB Board
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8SDP 11 CDR Team Goeckel
GUI Demonstration
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9SDP 11 CDR Team Goeckel
Testing
Problems• Board’s are unreliable for RF• Varying RSSI• Tentative Conclusion difference
of .05 to .1 volt
B1 RSSI B2 RSSI
2.0 2.08
2.04 1.75
1.87 1.74
1.78 1.74
1.83 1.8
1.74 1.75
1.8 1.6
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10SDP 11 CDR Team Goeckel
Design Challenges
Noise• Appropriate Signal Threshold• Duration for transmission
Variable transmission strength Procuring reliable data Demonstrate functioning system
• Computer display of radio activity
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11SDP 11 CDR Team Goeckel
Team Roles
Adebayo – Hardware production, radio testing Mark – Programming radio unit, radio debugging Joe – Report, Hardware production, radio testing Simon – GUI for final demonstration, radio
programming, radio testing
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12SDP 11 CDR Team Goeckel
The Gantt Chart
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13SDP 11 CDR Team Goeckel
What is next
Complete protocols for all radios Field testing GUI for Final Demonstration Fabrication of Radios
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14SDP 11 CDR Team Goeckel
Radio Demonstration
Send transmit signal Receive transmit signal with receiver and eavesdropper Friend transmits noise to block eavesdropper Eavesdropper picks up noise signal Receiver picks up desired transmit signal
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15SDP 11 CDR Team Goeckel
Questions?