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Table 2 Relationship between \(\chi\) and \(\phi_{m}^{q}\)

From: Robust adaptive beamforming based on covariance matrix reconstruction using Gauss–Legendre quadrature and steering vector estimation

\(\chi\)

1

2

3

4

\(\phi_{m}^{q}\)

\(\pi\)

\(0\) and \(\pi\)

\(0\), \({{2\pi } \mathord{\left/ {\vphantom {{2\pi } 3}} \right. \kern-0pt} 3}\), and \({{4\pi } \mathord{\left/ {\vphantom {{4\pi } 3}} \right. \kern-0pt} 3}\)

\(0\), \({\pi \mathord{\left/ {\vphantom {\pi 2}} \right. \kern-0pt} 2}\), \(\pi\), and \({{3\pi } \mathord{\left/ {\vphantom {{3\pi } 2}} \right. \kern-0pt} 2}\)