Several ways to estimate the position of a WirelessSensor-Network (WSN) node have been discussed in the past years. Unlike in outdoor solutions where the Global Positioning System (GPS) could be used in most applications, a general solution for indoor usage has not been found. The few existing indoor solutions on the market are highly specialized and rely on infrastructure or on very expensive ...

We propose to automate much of the data collection and tuning necessary for recreational modeling by utilizing Global Positioning System (GPS) data. As GPS technology becomes more ubiquitous and affordable, increasing numbers of outdoor enthusiasts are utilizing the technology for navigation and trip logging. GPS data collected by recreators can be used to both generate travel networks and to d...

The goal of this paper is to enable readers to better “design” successful transitions that move Science and Technology or Research and Development (S&T/R&D) technologies and systems into operational capabilities for users. Transitions from S&T/R&D into acquisition and operations are challenging and critical to providing capabilities to end users. Two historical examples, the Global Positioning ...

The ionosphere is the major contributor of errors in Global Positioning System (GPS), especially during the 11-year sunspot cycle. The incoming 11-year sunspot cycle is expected to peak in 2013. The ionosphere condition is distinctly severe during ionospheric disturbances caused by high solar activity, which raises the question of how will this affect the ionosphere in the equatorial region, es...

Global Positioning System (GPS)-equipped probe vehicles have been one of the principal techniques in detection of traffic flow. In order to guide the application of the different methods using data from GPS probe vehicles, this paper compares two of the most popular methods using the GPS data to estimate traffic statethe method of tracking probe vehicles, and the one of fitting the model with t...

We demonstrate a one-dimensional optical lattice clock with a spin-polarized fermionic isotope designed to realize a collision-shift-free atomic clock with neutral atom ensembles. To reduce systematic uncertainties, we developed both Zeeman shift and vector light-shift cancellation techniques. By introducing both an H-maser and a Global Positioning System (GPS) carrier phase link, the absolute ...

We present interference analysis from Non-communication device which is used in many applications such as factory, home and hospital into Global Positioning System (GPS) Service. GPS service is used to detect location for car driving and safety of life. Nowadays, non-communication devices are increased rapidly. Therefore, in case that noncommunication device and GPS receiver are operated in clo...

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...