Localization for Wireless Sensor Networks Assisted by Two Mobile Anchors with Improved Grey Wolf Optimizer

Table 1

List of acronyms.

Acronym	Definition
WSN	Wireless sensor network
ROI	Region of interest
GNSS	Global navigation satellite system
MAL	Mobile-anchor-assisted localization
GWO	Grey wolf optimizer
DASCAN	Double anchor scan
MDS-GWO	Multiple-disturbance strategy grey wolf optimization
SLMAT	Mobile anchor node based on trilateration and scan
SSD	Static search-and-decide
DSD	Dynamic search-and-decide
PP-MMAN	Path planning method for multiple mobile anchor nodes
ERTC	Enhanced RSSI-based tree-climbing mechanism
PSO	Particle swarm optimization
WOA	Whale optimization algorithm
PI	Perpendicular intersection
RMSE	Root mean square error
RSSI	Received signal strength indicator
DOI	Degree of irregularity
CRLB	Cramer-Rao lower bound