Package com.irurueta.navigation.indoor

Class RssiFingerprint<S extends RadioSource,R extends RssiReading<S>>

java.lang.Object

com.irurueta.navigation.indoor.Fingerprint<S,R>

com.irurueta.navigation.indoor.RssiFingerprint<S,R>

Type Parameters:

S - a RadioSource type.

R - a RssiReading type.

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

RssiFingerprintLocated

public class RssiFingerprint<S extends RadioSource,R extends RssiReading<S>>
extends Fingerprint<S,R>

Contains RSSI readings from several radio sources for an unknown location to be determined.

See Also:

• Serialized Form

Field Summary

Fields inherited from class com.irurueta.navigation.indoor.Fingerprint

readings

Constructor Summary

Constructors

Constructor	Description
RssiFingerprint()	Constructor.
RssiFingerprint(List<R> readings)	Constructor.

Method Summary

Modifier and Type	Method	Description
double	distanceTo(RssiFingerprint<S,R> otherFingerprint)	Gets Euclidean distance of signal readings from another fingerprint.
double	getMeanRssi()	Gets average RSSI (received signal strength indicator) of all readings contained in this fingerprint expressed in dB's.
double	noMeanDistanceTo(RssiFingerprint<S,R> otherFingerprint)	Gets Euclidean distance of signal readings from another fingerprint.
double	noMeanSqrDistanceTo(RssiFingerprint<S,R> otherFingerprint)	Gets squared Euclidean distance of signal readings with mean RSSI removed from another fingerprint.
double	sqrDistanceTo(RssiFingerprint<S,R> otherFingerprint)	Gets squared Euclidean distance of signal readings from another fingerprint.

Methods inherited from class com.irurueta.navigation.indoor.Fingerprint

getReadings, setReadings

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

RssiFingerprint

public RssiFingerprint()

Constructor.

RssiFingerprint

public RssiFingerprint(List<R> readings)

Constructor.

Parameters:

readings - non-located RSSI readings.

Throws:

IllegalArgumentException - if provided readings is null.

Method Details

distanceTo

public double distanceTo(RssiFingerprint<S,R> otherFingerprint)

Gets Euclidean distance of signal readings from another fingerprint.

Parameters:

otherFingerprint - other fingerprint to compare.

Returns:

Euclidean distance of signal readings from another fingerprint.

sqrDistanceTo

public double sqrDistanceTo(RssiFingerprint<S,R> otherFingerprint)

Gets squared Euclidean distance of signal readings from another fingerprint.

Parameters:

otherFingerprint - other fingerprint to compare.

Returns:

squared Euclidean distance of signal readings from another fingerprint.

getMeanRssi

public double getMeanRssi()

Gets average RSSI (received signal strength indicator) of all readings contained in this fingerprint expressed in dB's.

Returns:

average RSSI of all readings.

noMeanDistanceTo

public double noMeanDistanceTo(RssiFingerprint<S,R> otherFingerprint)

Gets Euclidean distance of signal readings from another fingerprint.

Parameters:

otherFingerprint - other fingerprint to compare.

Returns:

Euclidean distance of signal readings from another fingerprint.

noMeanSqrDistanceTo

public double noMeanSqrDistanceTo(RssiFingerprint<S,R> otherFingerprint)

Gets squared Euclidean distance of signal readings with mean RSSI removed from another fingerprint. Mean RSSI's are taken into account so that bias effects introduced by different device's hardware is partially removed.

Parameters:

otherFingerprint - other fingerprint to compare.

Returns:

squared Euclidean distance of signal readings from another fingerprint with average RSSI's removed.