CDR Keeping The Secret

SDP 11 CDR Team Goeckel

Group: Adebayo Adeyemi, Joseph Hayward, Mark Kohls, Simon McAuliffe

Advisor:Dennis Goeckel

CDRKeeping The Secret

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.


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.


Software Requirements

RX Radio

RX Radio

RX Radio

TX Radio

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Radio Diagram

Antenna

Receiver

Transmitter

Microcontroller

Microphone

Speaker

Transceiver


Schematic


PCB Board


GUI Demonstration


TestingProblems

• 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


Design Challenges Noise

• Appropriate Signal Threshold• Duration for transmission

Variable transmission strength Procuring reliable data Demonstrate functioning system

• Computer display of radio activity


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


The Gantt Chart


What is next Complete protocols for all radios Field testing GUI for Final Demonstration Fabrication of Radios


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


Questions?

CDR Keeping The Secret

Documents