This paper describes inversion methods for HF radar sea echo Doppler spectra, giving parameters of the ocean wave spectrum in the important long-wavelength region. Radar spectra exhibiting very narrow spikes in the higher-order structure adjacent to the first-order lines are indicative of ocean wave components with a single dominant wavelength. In the simplest method of interpretation these com...

The SAAB REX WaveRadar sensor is widely-used for platform-based wave measurement systems by the offshore oil and gas industry. It offers in-situ surface elevation wave measurements at relatively low operational costs. Furthermore, there is adequate flexibility in sampling rates, allowing in principle sampling frequencies from 1 Hz to 10 Hz, but with an angular microwave beam width of 10 degrees...

HF radar can be employed to measure sea surface state parameters such as waveheight, wind field and surface current velocity. This paper describes the application of the high frequency ground wave radar in remote sensing the surface conditions over the Eastern China Sea in October, 2000. The radar, referred to as the OSMAR2000, was developed by Wuhan University. Preliminary wave spectra, wavehe...

During October 1984, measurements of directional ocean wave spectra in high sea states were made off the coast of Chile, near Tierra del Fuego, by a synthetic aperture radar aboard the space shuttle Challenger. Simultaneously, independent measurements of ocean wave spectra were made by a complement of airborne instruments. The results indicate that a low-altitude orbiting synthetic aperture rad...

The paper presents a new inverse synthetic aperture radar (ISAR) algorithm intended for radar cross-section (RCS) imaging and measurement from scattered fields. The method, based on a spherical-wave near-field illumination of the target, overcomes the requirement for an expensive compact range facility to produce a plane wave illumination. The formulation and the implementation of the algorithm...

Surface Wave High Frequency Radars (SWHFR) are taken into account in the content of modeling and simulation challenges. Examples related to multi-mixed path surface wave propagation, radar cross section (RCS) prediction, and total radar echo showing target, clutter, noise, and interference are presented.

An interferometric linear frequency modulated continuous wave (LFMCW) millimetre-wave radar is presented, along with the results of an experiment conducted to srudy the feasibility of using it in a ñirure millimetre-wave interferometric inverse synthetic aperture radar (InISAR) system. First, a description of the radar is given. Then, the signal processing chain is described, with special atten...

In this paper, we have designed the patch array antennas with the slots capable of working in millimeter-wave radar system. The designed array antennas have multi-band characteristics at 77GHz. As a result, this paper is proposed the possibility of prototyping by design and analysis of microstrip array antennas for mm-wave radar as using a patch arrays with U-shaped slots.

Absorption of electromagnetic energy by a dissipative material is one the most fundamental processes that underlies plethora applied problems, including sensing, radar detection, wireless power transfer, and photovoltaics. Common wisdom finite object illuminated plane wave removes only amount wave's flux, which determined object's absorption cross-section. Thus, it interest to see if any far-fi...

The wireless measurement of various physical quantities from the analysis of the RADAR Cross Sections variability of passive electromagnetic sensors is presented. A millimetre-wave Frequency-Modulated Continuous-Wave RADAR is used for both remote sensing and wireless identification of sensors. Long reading ranges (up to some decameters) may be reached at the expense of poor measurement resoluti...