The alignment of the Laser Interferometer Gravitational-wave Observatory (LIGO) using the Global Positioning System (GPS) is described. The LIGO project is designed to detect gravitational waves from astrophysical sources by laser interferometry. There are two sites separated by 3002 km that will be operated in coincidence. At each, site laser beams propagate in two orthogonal 4 km long evacuat...

The alignment of the Laser Interferomter Gravitational-wave Observatory (LIGO) using the Global Positioning System (GPS) is described. The LIGO project is designed to detect gravitational waves from astrophysical sources by laser interferometery. There are two sites separated by 3002 km that will be operated in coincidence. At each, site laser beams propagate in two orthogonal 4 km long evacuat...

Assessment of physical fitness of endurance athletes is usually performed by means of standardized exercise protocols in specialized laboratories. The recent development of devices measuring heart rate, power output, speed, etc. raises the possibility to assess the fitness level from data collected on the field. We propose a model based on cardiac parameters identification on training activitie...

Snowshoe hares (Lepus americanus) are generally sedentary, but are likely to move among habitats frequently to gain access to spatially segregated food and cover. We investigated movement patterns of hares from 2 characteristic boreal habitats using very-high-frequency radio collars (n 1⁄4 300) monitored weekly and global positioning system (GPS) collars (n 1⁄4 18) programmed to record location...

Satellite radar interferometry (InSAR) can be applied to study vertically integrated atmospheric refractivity variations with a spatial resolution of 20 m and an accuracy of 2 mm, irrespective of cloud cover or solar illumination. The data are derived from the diierence between the radar signal delay variations within the imaged area during two acquisitions with a temporal separation of one or ...

The signals from the Global Positioning System (GPS) reflected from the ocean surface have been considered for bistatic GPS remote sensing to estimate parameters including wind speed and height and roughness of the ocean surface. A variety of models, methods, and experimental campaigns have verified the level of viability and reliability of the bistatic GPS radars. In this article, we analyse t...

[1] An economical approach to improving predictions of hydrological models produced highly accurate representations of ephemeral and perennial stream networks. Traditional drainage network extraction from digital elevation models (DEMs) often yields inaccurate and inconsistent results because of elevation errors. Topographic wetness index maps calculated from alternative terrain representations...

Applications of artificial satellites in positioning and navigation can be traced back to as early as the 1960’s, just shortly after the launch of the first artificial satellite in 1957, when the era of satellite geodesy started. Over the past four decades, particularly since the inception of the Global Positioning System (GPS), satellite-based positioning techniques have been playing an increa...

This paper presents a vital signs monitoring system using wireless networks in Thailand. The system consists of vital signs measurements including electrocardiogram and heart rate. In addition to the health information of patients that is monitored, the location of patients specified using the global positioning system (GPS) is employed in the system. A prototype of the system has been develope...

Alison Brown is the President and Chief Executive Officer of NAVSYS Corporation, which she founded in 1986. NAVSYS Corporation specializes in developing next generation Global Positioning System (GPS) technology. Dr. Brown has a PhD in Mechanics, Aerospace, and Nuclear Engineering from UCLA, an MS in Aeronautics and Astronautics from MIT, and an MA and BA in Engineering from Cambridge Universit...