This study, which is performed in the framework of the European Project MAXWAVE, deals with both theoretical aspects of extreme waves description as well as new techniques to observe these waves using different remote sensing techniques. The final goal is to improve the understanding of the physical processes responsible for the generation of extreme waves and to identify geophysical conditions...

This paper describes the waveform analysis for an experimental long-range (10 Km) high-resolution (1x1 m2) Synthetic Aperture Radar (SAR) sensor in the millimetre wave band on board UAV. Motivated by the need to minimize the transmitted power and the volume filled by the sensor, it is proposed the use of a FMICW (Frequency Modulated Interrupted Continuous Wave) radar type. It also is provided a...

The technical approach in this project involves three types of models: (1) the two-scale electromagnetic scattering model, which relates the radar backscatter to the surface wave spectrum, (2) the wave action model, which describes the relationship between the surface wave spectrum and the near-surface wind field, and (3) atmospheric dynamical models that describe or constrain the spatial varia...

The phase noise is a very important index to wireless system, especially in millimeter-wave continuous wave radar systems. The phase noise of the signal, which is firstly leaked from transmitter and then mixed to intermediate frequency band by the local oscillator (Tx-IF), will worsen the sensitivity of superheterodyne radar system used for Doppler velocity detection. In this paper, the coheren...

Wave absorbing materials are widely used to prevent military equipment from being detected by radar wave and also serve as civil electromagnetic shielding. The properties of determined a combination the parameters thickness composite material. In actual case, theoretically designed reflection loss peak intensity bandwidth deviate engineered values. There few reports on mechanism about variation...

We present a broadband microwave metamaterial (MM) absorber, the unit cell of which consists of a lumped-resistor-loaded electric-inductive-capacitive (ELC) resonator and a cut-wire on the same side of a flexible polyimide substrate. In contrast to the common MM absorber, the metallic pattern layer of the proposed structure is placed parallel to the direction of propagation of the incident wave...

Freeway traffic flow is described in terms of control theory. The detecting elements of millimeter-wave radar sensors, which detect speed and occupancy time by a 61-GHz continuous-wave doppler radar, are used. The regulating unit consists of variable traffic signs for traffic-dependent speed limit and alternative route guidance. The control unit consists of a local computer and a control center...

[1] Plasma lines excited by a powerful, high-frequency (HF) radio wave are studied using data obtained with an ultrahigh frequency (UHF) radar at HAARP (High Frequency Active Auroral Research Program) from 3 to 5 February 2005. Of particular interest is persistent enhancement of the radar backscatter power during HF on at several HF frequencies. The persistent enhancement is induced with the HF...