<?php
function calculateAccuracy($txPower, $rssi){
if ($rssi == 0) {
return -1.0; // if we cannot determine accuracy, return -1.
}
$ratio = $rssi*1.0/$txPower;
if ($ratio < 1.0) {
return pow($ratio,10);
}
else {
$accuracy = (0.89976)*pow($ratio,7.7095) + 0.111;
return $accuracy;
}
}
echo(calculateAccuracy(-100, -70));
echo(calculateAccuracy(-120, -70));
echo(calculateAccuracy(-140, -70));
echo(calculateAccuracy(-160, -70));
echo(calculateAccuracy(-180, -70));
echo(calculateAccuracy(-200, -70));
echo(calculateAccuracy(-220, -70));
- Output for 5.2.2 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.6 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
- 0.02824752490.00456213297416990.00097656250.000256909742347497.9114365451574E-52.7585473535156E-51.0635394207215E-5
- Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.1
- 0.02824752490.00456213297416990.00097656250.000256909742347497.9114365451574E-052.7585473535156E-051.0635394207215E-05
preferences:
250.17 ms | 402 KiB | 310 Q