Element index vector, specified as a vector of positive integers each of which takes
a value from 1 to N. The dimension N is the number
of elements of the array.
Normal vector of array elements, returned as a 2-by-M real
matrix. Each column of normvec specifies the normal direction of
the corresponding element in the local coordinate system in the form
[azimuth;elevation]. If the input argument
elemidx is not specified, M is the number of
elements of the array, N. If elemidx is
specified, M is the size of elemidx. You can
determine element indices using the viewArray
object function. The azimuth angle is defined as the angle from
x-axis toward y axis. The elevation angle is
defined as the angle from xy-plane toward z-axis.
Units are in degrees.
For uniform linear arrays, the normal vector depends upon the value of the
ArrayAxis property.
ArrayAxis Property Value
Array Normal Direction
'x'
azimuth = 90°, elevation = 0°
(y-axis)
'y'
azimuth = 0°, elevation = 0°
(x-axis)
'z'
azimuth = 0°, elevation = 0°
(x-axis)
For a conformal array, the origin of the local coordinate system, i.e., the
phase center of the array, is defined at an arbitrary point. In local coordinate
system, x, y, and z axes are three orthogonal axes with x axis defines the normal
direction of the conformal array. The elements are located in the 3D space.
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