Has anyone discovered a reliable method for converting an RSSI signal to an accurate distance? We have experimented with various formulas, but each one yields a different outcome.
One formula in particular that we've been testing is as follows:
public double calculateDistance(double signalLevelInDb, double freqInMHz) {
double exp = (27.55 - (20 * Math.log10(freqInMHz)) + Math.abs(signalLevelInDb)) / 20.0;
return Math.pow(10.0, exp);
}
When measuring signal strength, factors such as RSSI and dBm come into play, with distance being a key element. RSSI is tied to the device's chipset (refer to ). Without knowledge of the chipset, achieving your desired outcome through JavaScript may prove challenging.
If armed with dBm signal strength data, approximating an "effective" distance is possible, although this is impacted by variables like signal propagation medium and frequency band (2.4GHz vs 5GHz, for example).
For accurate distance measurement between a device and access point, utilizing geolocation services is likely the ideal solution.
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