Maximum Likelihood Angle Estimates of Two Signals Using Three Squinted Beams (Symmetric Solution)

摘要

The maximum likelihood estimates of the elevation angles of two closely spaced targets is considered. For an antenna constructed with three squinted beams a simple closed-form solution for the elevation angle is found. The solution is only valid when the center of the middle beam is directed toward the bisecting line between the sources and the principal axes of the antenna are parallel to the perpendicular to the line connecting the sources. This condition can be obtained with an antenna viewing an emission or reflection over a smooth reflecting sea. The accuracy of solution is studied using simulation procedures. The accuracy is found to be comparable to maximum liklihood solutions using an array antenna. (Author)