gr-phychic

Phychic: physical layer esoteric sensing tool

Motivation

• We needed to diagnose the physical layer of a remote system.
• We wanted to see with our own eyes frames arrival, SNR, doppler shift, etc.
• Transmitting raw IQ through internet was out of the question due to bandwidth limitations.
• Naive downsampling would create aliasing or miss frames.

Solution

• In the remote host:
  • modified our system to output a copy of raw iq through a IPC ZMQ socket. 0uhd is included as an example if you want to use an USRP remotely.
  • run inner_eye to:
    • read the socket
    • clever downsampling
    • offer that through a TCP ZMQ socket
• In the local host:
  • run seer.grc with gnuradio-companion to:
    • connect to remote TCP socket
    • show spectrum
    • save to a file

Installation

Arch Linux

Use tools/arch_build_helper.