Direction of Arrival Based on the Multioutput Least Squares Support Vector Regression Model

Table 1

Symbol and notation.

Symbol	Explanation
	Waveform of signal
	Direction vector of array
	The theoretical output of antennas
L	The number of training samples
	a-Dimensional real number space
	One-dimensional positive real number space
	Mutual coupling matrix
	The measured value of phase difference from baselines formed between the k-th antenna and the j-th antenna in the i-th training sample
	Direction of signal
	Zero-mean Gaussian noise
	The actually output of antennas
N	The number of antennas
	-Dimensional real number space
	-Dimensional positive real number space
	Phase differences matrix in the training data
	The matrix formed by cosine and sine function of DOA in the training data