Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

public class Main {
    /**
     * Function to calculate the distance in meters from dbm rssi values.
     * http://rvmiller.com/2013/05/part-1-wifi-based-trilateration-on-android/
     *
     * The function is based on Free Space Path Loss, and may not work with
     * indoor signal propagation.
     *
     * @param levelInDb RSSI value.
     * @param freqInMHz Frequency of the sending device.
     * @return Distance in meters.
     */
    public static double distanceFSPL(double levelInDb, double freqInMHz) {
        double exp = (27.55 - (20 * Math.log10(freqInMHz)) + Math.abs(levelInDb)) / 20.0;
        return Math.pow(10.0, exp);
    }
}