DOA	Direction of Arrival
SCA	Sparse Circular Array
UCA	Uniform Circular Array
MUSIC	Multiple Signal Classification
ESPRIT	Estimation of Signal Parameters via Rotational Invariance Techniques
ML	Maximum Likelihood
MIMO	Multi-in Multi-out
UAV	Unmanned Aerial Vehicle
SLA	Sparse Linear Array
NSLA	Nested Sparse Linear Array
NSCA	Nested Sparse Circular Array
ANM	Atomic Norm Minimization
EMaC	Enhanced Matrix Completion
SPICE	Sparse Iterative Covariance-based Estimator
GLS	Gridless-SPICE
BT	Beamspace Transformation
IBT	Inverse Beamspace Transformation
SDP	Semidefinite Problem
GSCA	Gridless DOA Estimation in Sparse Circular Array (Proposed Algorithm)
EVD	Eigenvalue Decomposition
RMSE	Root-Mean-Square-Error