A Distributed Anchor Node Selection Algorithm Based on Error Analysis for Trilateration Localization

Table 2

Explanation of parameters and variables.

Notation	Description
	Unknown node
	Communication radius
ring	The ring shown in Figure 9
	Neighbor anchor nodes set of unknown node on ring, recording distance and location information of anchor nodes
	The number of neighbor anchor nodes of unknown node
	Localization flag of unknown node . The initial value is 0, update to 1 after localization
	Record the time when the unknown node is located
	Minimum internal angle of the combination of anchor node,
	The shortest edge of the combination of anchor node,
	The shortest edge threshold
	Waiting time threshold