Innovative multi-channel synthetic aperture radar (SAR) concepts enable high-resolution wide-swath imaging, but the antenna length typically restricts the achievable swath width. This limitation can be overcome by a novel technique which is based on a single azimuth channel but operates the system with a continuously varied pulse repetition frequency (PRF) by this allowing in principle for arbi...

-A slotted waveguide providing a two dimensional near-field focused beam is presented in this paper. This antenna focuses the beam in the E-plane and provides a wide beam in the H-plane in order to illuminate a linear array, as reflector transmit-array antenna with a small width (100mm) and a very large length (1530mm) located in the near-field region. The simulated field distribution on the ar...

Firstly, the wavelet analysis was used as the filter tool to separate the different scale roughness from the reflector surface testing data, and a mathematical model of the multi-scale roughness was presented to investigate its impact on the radiation characteristic of the reflector antenna. Based on the roughness model, a formulation of density of the far-field was deduced and the definable mo...

Having combined the advantages of ground-based interferometric radar and Global Position System (GPS), a microwave radar with transponder for three-dimensional displacement monitoring method has been proposed. In this system, the active reflector ensures the long measurement distance at low antenna radiation power; the transponder provides the total solutions to antenna microwave leakage and mu...

This paper presents new techniques for simultaneous localization of multiple mobile robots using directional received signal strength (RSS). The RSS data is collected from the XBee wireless module with ZigBee technology. Directional RSS was achieved by a corner reflector antenna installed on the top of each mobile robot. The design parameters of the antenna were chosen by experiments and physic...

This thesis investigates the performance of a phased array of antenna elements conforming to a paraboloidal surface. We hypothesize that such a conformal phased array would have performance comparable to that of a correspondingly sized planar array. The performance of a paraboloidal array of antenna elements was simulated using an array program, and the resulting gains, side-lobe levels, and ha...

Many types of antennas can be used for digital TV receivers; in this article we try to design a double biquad antenna. This is due simple form, easy make, wide beamwidth. In designing receiver the Malang area, an STB device needed, so that analog still receive broadcasts. study, antenna made copper wire, each side length: ¼ ? , with working frequency: 650 MHz. order match impedance 75? coaxial ...

Uplink antenna arrays have the potential to greatly increase the Deep Space Network’s high-data-rate uplink capabilities as well as useful range, and to provide additional uplink signal power during critical spacecraft emergencies. While techniques for calibrating an array of receive antennas have been addressed previously, proven concepts for uplink array calibration have yet to be demonstrate...

The microwave observatory of subcanopy and subsurface (MOSS) project has been supported under the ESTO IIP to develop technologies for a SAR mission that provides global observations of soil moisture under substantial vegetation canopies and at useful depths. This VHF/UHF polarimetric SAR is designed to provide 7-10 day repeat observations of soil moisture under substantial vegetation canopies ...

Presented in this paper is a conceptual design by computer simulation of monopulse reflector antenna with dual-circularly polarized sum patterns and linearly azimuth elevation difference patterns, which can be called semi-dual antenna. The proposed consists five-element feed prime-focus parabolic reflector. novelty the consisting square waveguide channel radiator rectangular radiators. separati...