Atheros Csi Tool -

RSSI-based localization is accurate to ~2-3 meters. CSI-based localization, using and TDOA (Time Difference of Arrival) extracted from phase differences across multiple antennas, achieves sub-meter accuracy (often 10-30 cm). The Atheros CSI tool enables this without specialized UWB hardware.

Unlike RSSI, which provides a single scalar value (e.g., -45 dBm), CSI provides a vector of complex numbers representing the amplitude and phase shift of each individual OFDM (Orthogonal Frequency Division Multiplexing) subcarrier. atheros csi tool

The ecosystem has evolved since the original Atheros CSI Tool. RSSI-based localization is accurate to ~2-3 meters

The tool is designed specifically for (e.g., AR9280, AR9380, AR9580). These chips were chosen because they expose raw channel estimation data to the driver level—something most Broadcom, Intel, and Mediatek chips lock away in firmware. atheros csi tool