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in this link http://dtic.mil/dtic/tr/fulltext/u2/a028054.pdf a paper „Maximum Theoretical Angular Accuracy of Planer and Linear Arrays of Sensors“ can be found.

The accuracies are given in equations 19 (respect to the x axis) and 20 (respect to the y axis).

My question is: Shall the angle between the incoming ray and the normal direction to the planar array also play a role? I mean, the 90 degrees angle (along the normal direction) shall have the greatest accuracy. In example of line array on page 15 this angle (15 degrees there) is considered. Do I understand it correctly?

Senmeis