Design and Simulation of a Wide-Beam High-Power Parabolic Antenna with Dual-Source

Abstract

For resolving the essential problem that the beam is too narrow in the application of the high-power UWB (Ultra-Wideband) antenna with single-source, a novel wide-beam high-power parabolic antenna with dual-source has been designed, and the edge of the paraboloid was cut in order to reduce the size of the antenna. Radiation properties of this proposed antenna are studied with finite-difference time-domain (FDTD) numerical method. The radiation properties of the proposed antenna can be improved by changing the structure of the parabolic antenna and adjusting the angle between the source and the axis of the antenna. The result shows that the beam-width has been improved significantly under the precondition of maintaining the peak power, and also the size of the antenna was minished by cutting the edge of the paraboloid.

Joint estimation of space target attitude and size based on polarimetric ISAR images and modified U-net model

“…Based on the key point extraction results and the resolution information of ISAR image, the size parameters of space target component can be obtained For ideal estimation of k3, its projection results on imaging plane should be collinear with k2. Under this assumption, the loss function for attitude parameter estimation is (8) where 3 k is the attitude estimation result and 2 3 3…”

“…Considering the fact that the 2D ISAR images are the projection results of 3D target on ISAR imaging plane, the relative attitude and size information of 3D target can be derived from 2D sequential ISAR images [7] . In this vein, the typical structure of space targets has been paid special attention, such as solar panel and parabolic antenna [7,8] . Compared with traditional scatter association approaches, the influence of angular glint phenomenon is removed and the robustness is much better.…”