Automatic Position Reporting Radio

Project

The aim of this project was to build a communication system to allow a user to automatically transmit their location to a distant receiver.

• This system allows for location tracking without needing cellular connection.
• Could be used while hiking, camping, off-roading, or road-tripping.

Methods

• To transmit the position, a message was first put into a data frame.
• The data frame was then modulated with a QPSK modulation.
• The modulated signal was transmitted and then received.
• The receiver filtered the signal, then performed synchronization.
• After demodulation, the data frame was recovered.
• Finally, the message is extracted from the data frame.

Conclusion

• Results show that messages are transmitted and received.
• The messages are identifiable.
• These results show that the solution will work with a little bit of refinement.
• Once interfaced with a GPS, the text message will be replaced with user position.

Initial Results