AM Radio Emergency Alert System for Unmanned Tunnels Using FPGA Technology
By
anonymoosestdnt
Sesame, salt, and substance. A flagship bake.
Summary
The article describes an AM radio break-in system designed for emergency alert transmission in unmanned tunnels. The system uses a Red Pitaya FPGA to create a 12-channel AM radio broadcast system that transmits pre-recorded emergency alerts across multiple frequencies. The solution addresses the problem of no mobile coverage in tunnels during construction and maintenance by leveraging AM radio signals that propagate via leaky feeder cables along tunnel structures. The system ensures that any AM radio tuned to any station in the band will receive emergency messages, taking advantage of the fact that vehicles already have cheap, robust AM radios installed.
Key quotes
· 4 pulledAM signals propagate along tunnel structures via leaky feeder cables, and receivers are cheap, robust, and already present in every vehicle.
The system broadcasts pre-recorded emergency alerts across multiple frequencies so that any AM radio tuned to any station in the band will receive the message.
Why AM radio in a tunnel? During construction and maintenance, vehicles with standard AM radios transit through tunnels that have no mobile coverage.
A 12-channel AM radio broadcast system using Red Pitaya FPGA for emergency alert transmission in unmanned tunnels.
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