CurveFittedDistanceCalculator (lib 1.0.20210506.1515 API)

java.lang.Object
- org.altbeacon.beacon.distance.CurveFittedDistanceCalculator

All Implemented Interfaces:

DistanceCalculator
```
public class CurveFittedDistanceCalculator
extends Object
implements DistanceCalculator
```
This class estimates the distance between the mobile device and a BLE beacon based on the measured RSSI and a txPower calibration value that represents the expected RSSI for an iPhone 5 receiving the signal when it is 1 meter away. This class uses a best-fit curve equation with configurable coefficients. The coefficients must be supplied by the caller and are specific to the Android device being used. See the ModelSpecificDistanceCalculator for more information on the coefficients. Created by dyoung on 8/28/14.

Field Summary

Fields
Modifier and Type Field Description

static String TAG

Constructor Summary

Constructors
Constructor	Description
`CurveFittedDistanceCalculator(double coefficient1, double coefficient2, double coefficient3)`	Construct a calculator with coefficients specific for the device's signal vs.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`double`	`calculateDistance(int txPower, double rssi)`	Calculated the estimated distance in meters to the beacon based on a reference rssi at 1m and the known actual rssi at the current location

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - TAG
```
public static final String TAG
```
    See Also:
    
    Constant Field Values
- Constructor Detail
  - CurveFittedDistanceCalculator
```
public CurveFittedDistanceCalculator(double coefficient1,
                                     double coefficient2,
                                     double coefficient3)
```
    Construct a calculator with coefficients specific for the device's signal vs. distance
    
    Parameters:
    
    coefficient1 -
    
    coefficient2 -
    
    coefficient3 -
- Method Detail
  - calculateDistance
```
public double calculateDistance(int txPower,
                                double rssi)
```
    Calculated the estimated distance in meters to the beacon based on a reference rssi at 1m and the known actual rssi at the current location
    
    Specified by:
    
    calculateDistance in interface DistanceCalculator
    
    Parameters:
    
    txPower -
    
    rssi -
    
    Returns:
    
    estimated distance