2D	Two-dimensional
3D	Three-dimensional
AoA	Angle of arrival
ASE	Aircraft survivability equipment
CE95	Circular error 95%
CEP	Circular error probable
CF	Closed-form
CTLS	Constrained total least squares
DD	Differential Doppler
DF	Direction finding
DoA	Direction of arrival
DPD	Discrete probability density
EA	Electronic attack
ECCM	Electronic counter-countermeasures
ECM	Electronic countermeasures
ELINT	Electronic intelligence
EM	Electromagnetic
EMI	Electromagnetic interference
EOB	Electronic order of battle
EP	Electronic protection
ERP	Equivalent radiated power
ES	Electronic support
ESM	Electronic support measures
EW	Electronic warfare
FDoA	Frequency difference of arrival
GDoP	Geometric dilution of precision
GNSS	Global navigation satellite system
IPF	Instantaneous particle filter
ISR	Intelligence, surveillance, and reconnaissance
LLS	Linear least squares
LoB	Line of bearing
LS	Least squares
ML	Maximum likelihood
NLoS	Non-line of sight
NLS	Nonlinear least squares
PCE	Polynomial chaos expansion
PDF	Probability density function
PDoA	Phase/Power difference of arrival
PF	Particle filter
PoI	Probability of intercept
RF	Radiofrequency
RMS	Root mean square
RMSE	Root mean square error
RSE	Root square error
RSS	Received signal strength
RSSD	Received signal strength difference
RWR	Radar warning receiver
SD	Standard deviation
SNR	Signal-to-noise ratio
SSCF	Single-step closed-form
SSL	Single-site location
SWaP	Size, weight, and power
TDoA	Time difference of arrival
TLS	Total least squares
ToA	Time of arrival
TSCF	Two-step closed-form
TTP	tactics, techniques, procedures
UAS	Unmanned aircraft system
WLS	Weighted least squares
WTAE	Weighted trimmed average estimate