This paper presents the results of the ocean surface current velocity estimation using 6 Radarsat-1 SAR images acquired in west coastal area near Incheon. We extracted the surface velocity from SAR images based on the Doppler shift approach in which the azimuth frequency shift is related to the motion of surface target in the radar direction. The Doppler shift was measured by the difference bet...

Observations of E region backscatter by the Iceland East SuperDARN HF radar from the 30 minute period 2330 to 2400 UT on 13 September 1999 are presented, along with simultaneous observations of auroral luminosity from two all-sky cameras. Interferometric techniques are employed to estimate the altitude of origin of each echo observed by the radar. Under investigation is a region of backscatter ...

In this study we suggest that the velocity of water entering the cervical esophagus can be used as an index of pharyngeal swallowing function. In this article, the basic in vitro principles of water and viscous water flow velocity evaluation using ultrasonic methods are introduced. Water flow involving small gas bubbles passing through a silicon tube could be monitored in the B-mode images and ...

Improvement on Inter Carrier Interference (ICI) mitigation techniques for OFDM caused by Doppler effects through minimizing channel estimation error and decreasing channel time varying rate is investigated. The performance of pilot-aided channel estimation techniques depends on pilot placement and arrangement and also on the channel time varying rate. The block-type and comb-type pilot arrangem...

Retinal oxygen metabolic rate can be effectively measured by visible-light optical coherence tomography (vis-OCT), which simultaneously quantifies oxygen saturation and blood flow rate in retinal vessels through spectroscopic analysis and Doppler measurement, respectively. Doppler OCT relates phase variation between sequential A-lines to the axial flow velocity of the scattering medium. The det...

Phase-modulated continuous wave (PMCW) has been widely regarded as a promising modulation scheme for radar systems, e.g., in highly automated driving (HAD) applications. Although the so-called outer coding can efficiently enable multiple-input-multiple-output (MIMO) operation of PMCW-based yielded processing gain this multiplexing approach may be reduced at increasing Doppler shifts. In context...

Micro-Doppler is regarded as a unique signature of target with micro-motions. The sophisticated recognition the cone-shaped targets can be realized through micro-Doppler effect. However, it difficult to extract micro-motion features perpendicular radar line sight (LOS) effectively. In this paper, parameters extraction method put forward based on rotating antenna. First, new configuration propos...

We investigate the in ̄uence of magnetic mirroring and elastic and inelastic scattering on the angular redistribution in a proton/hydrogen beam by using a transport code in comparison with observations. H-emission Doppler pro®les viewed in the magnetic zenith exhibit a red-shifted component which is indicative of upward ̄uxes. In order to determine the origin of this red shift, we evaluate the i...

In the above paper [1], an extraordinary claim of experimental absence of the transverse Doppler effect is made. As stated in the abstract, “An experiment . . . showing that a 33-GHz microwave signal received by rotating antennas is not exhibiting the frequency shift (“transverse Doppler effect”) predicted by the relativistic Doppler formula.” In this comment, we will reanalyze the experiment a...