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I have a model of signal as $$ Y=AX + N $$ where $Y$ is received data in a linear array, $A$ is steering matrix, $X$ is data of sources and $N$ is noise. If $A$ has the form of $A=\exp(\alpha \sin(\theta))$ where $\alpha$ can be consider as a constant, $\theta =[0,180]$. How can I compose a dictionary of $A$ based on DPSS-to solve an estimation problem?

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