git clone https://github.com/xieyaxiongfly/Atheros-CSI-Tool-UserSpace-APP.git

Because CSI reacts to physical movement, you can build an invisible perimeter alarm. A single Atheros-based access point can detect if a person enters a room, even if that person carries no Wi-Fi device. This is passive, device-free intrusion detection.

| Feature | Description | |---------|-------------| | | Full 56/114 subcarriers (not just aggregated). | | Timestamp per packet | Microsecond precision (from hardware). | | Noise floor | Also recorded (useful for SNR estimation). | | Monitor mode | Capture CSI from any 802.11n traffic (not just own transmissions). | | Channel hopping | Can sweep channels (slower). |

For each subcarrier k , the tool outputs:

It runs on standard Atheros-based chips (specifically those using the