Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Apache License 

public class Main {
    /**
     * Calculates distance using Free-space path loss. Constant -27.55 is used for calculations, where frequency is in MHz and distance in meters.
     * FSPL(dB) = 20 log(d) + 20 log(f) - 27.55; d distance from the transmitter [m], f signal frequency [MHz]
     *
     * @param level measured RSSI [dBm]
     * @param freq  WiFi frequency [MHz]
     * @return distance from AP [m]
     */
    public static double calculateDistance(double level, double freq) {
        double exp = (27.55 - (20 * Math.log10(freq)) + Math.abs(level)) / 20.0;
        return Math.pow(10.0, exp);
    }
}