Doppler effect is used to measure the relative speed of a moving target with respect to the radar, and is also used to interpret the frequency shift of the backscattering from the ocean wave according to the water-wave phase velocity. The widely known relationship between the Doppler shift and the water-wave phase velocity was deduced from the scattering measurements data collected from actual ...

Over the past 10 years, synthetic aperture radars (SAR) have frequently detected pronounced signatures of nonlinear, coastal internal waves 1-6 that are produced by the interaction of short-wavelength surface waves with internal wave-induced surface currents. A qualitative representation of the signature generation process is shown in Fig. 1 for a group of nonlinear internal waves. At the leadi...

Nowadays, more and more technologies are implemented in vehicles to improve driver assistance in order to enlarge comfort and avoid accidents. Automotive radar systems have been gradually installed into vehicles with the growth of wireless technologies. Among the utilizations of automotive radar systems, survey around automobiles for the prevention of traffic accidents is one of the prospective...

Microwave absorbing materials are usually designed to solve protection against electromagnetic interference in wireless communication systems and high frequency circuit mechanisms. In this research polystyrene (PS) nanocomposites containing various nano-fillers were successfully synthesized. The novelty of this work is comparing of three various nanostructures: non-metallic conductive graphene ...

Introduction: Understanding the relationship between ocean surface waves and the radar backscatter they generate is key to the development of new radar-based techniques to measure ocean parameters, such as wave height and current speed and direction, of importance to both the Navy and the civilian sector. This knowledge is also needed to improve the Navy’s ability to distinguish between signals...

Humidity remains in the atmosphere even on bright days. Water of all three states can be found naturally in the atmosphere: liquid (rain, fog, and clouds), solid (snowflakes, ice crystals), and gas (water vapour). Water in any state is an obstacle in the link of the electromagnetic wave. When the wave passes through the water particles, a part of its energy is absorbed and a part is scattered. ...