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Table 1 Schematic description of the preprocessing

From: Automated linear regression tools improve RSSI WSN localization in multipath indoor environment

Procedure Min-Max
If there are larger than expected large circles for the used hardware: delete them
Procedure Ignoring_Circles
Delete the typical circles containing at least 5 others if there are no typical circles contained by at least 5 others
If there are typical circles contained by at least five others delete them.
Procedure Maximum_Likelihood
Group the anchors based on distance
Are there small distance circles contained by other small distance circles of other group members?
If yes:
new typical circle radius all members = geometric average of
m measured distances
new_Error_on_Distance = (Error_on_Distance of member)
/sqrt (# remaining typical circles -1)
adapt small and large circles according to
If no: continue