The gravity deformations of the ATCA main reflector, as well as the displacements in the sub-reflector and feed, have been surveyed at a set of elevations by VMS (AT 39.3/109). In this report, I quantify these deformations and displacements and examine their effects on the antenna performance at 90 GHz. I have computed the far-field radiation pattern at each of the survey elevations and the ele...

The space-time conservation element and solution element (CE/SE) method is used to solve the conservation law form of the compressible axisymmetric Navier-Stokes equations. The equations are time marched to predict the unsteady flow and the near-field screech tone noise issuing from an underexpanded circular jet. The CE/SE method uses an unstructured grid based data structure. The unstructured ...

We propose an iterative method of 3D localization of 2D or 3D polygonal shapes by monocular vision from a sngle image. The method assumes that the size of the polygonal object is known and that the camera is calibrated. Essentially, the 3D localization is obtained by the resolution of a non-linear system using the parametric equations of the polygonal object (contour) projection in the image pl...