نتایج جستجو برای: radio navigation

تعداد نتایج: 153186  

2010
Matthias Wildemeersch Joaquim Fortuny-Guasch

The Institute for the Protection and Security of the Citizen of the EC Joint Research Centre (IPSC-JRC) has beenmandated to perform a study on the Radio Frequency (RF) threat against telecommunications and ICT controlsystems. This study is divided into two parts. The rst part concerns the assessment of high energy radio frequency(HERF) threats, where the focus is on the generation o...

2007
Alison Brown Ben Mathews Dien Nguyen

NAVSYS Corporation and Microcosm, Inc., have jointly developed a design for a flexible, high-performance, miniaturized, space-based Software GPS Receiver (SSGR) based on a Software Defined Radio (SDR) architecture that optimally combines GPS, INS, and star-tracker inputs to provide a flexible, integrated precision navigation and attitude determination solution for space applications. The SSGR i...

2015
Dian ZHANG Wei CHEN Biao HUANG Isao Shimoyama

A multi-channel implantable electrical stimulator is described based on wireless microcontroller CC2430. PWM conversion circuits to DAC and the voltage-controlled current source are designed, the latter of which is needed for electrical stimulator circuits. Through the multi-channel analogy switches, positive and negative pulses on the rat brain areas can be achieved. The positive and negative ...

2010
Di Qiu Dan Boneh Sherman C. Lo Per K. Enge

Loran is a radio-based navigation system originally designed for naval applications. We show that Loran-C's high-power and high repeatable accuracy are fantastic for security applications. First, we show how to derive a precise location tag--with a sensitivity of about 20 meters--that is difficult to project to an exact location. A device can use our location tag to block or allow certain actio...

2009
Alessio De Angelis John Olof Nilsson Isaac Skog Peter Händel Paolo Carbone A. De Angelis

A research study aimed at developing a novel indoor positioning system is presented. The realized system prototype uses sensor fusion techniques to combine information from two sources: an in-house developed local Ultra-Wideband (UWB) radio-based ranging system and an inertial navigation system (INS). The UWB system measures the distance between two transceivers by recording the round-trip-time...

2008
MOHD HAFIZ CHRIS RIZOS

Given that agricultural cycles, human well-being, economic growth and many societal activities are affected by climate variability, a greater understanding of critical atmospheric parameters (such as refractivity, pressure, temperature and humidity) is of paramount importance. Recently many countries have investigated the feasibility of using the space-based radio navigation satellites of the G...

2013
Haris Haralambous Harris Papadopoulos

This paper presents the development of an Artificial Neural Network electron density profiler based on electron density profiles collected from radio occultation (RO) measurements from LEO (Low Earth Orbit) satellites to improve the spatial and temporal modeling of ionospheric electron density over Europe. The significance in the accurate determination of the electron density profile lies on th...

2009
F. M. Schubert B. H. Fleury

A versatile GNSS signal simulation tool for time-domain simulations at sample-level with a focus on wave propagation effects, such as multipath or atmospheric disturbances, is introduced. The Satellite Navigation Radio Channel Signal Simulator (SNACS) uses a modular, object-oriented approach implemented in C++. The application is thoroughly designed in a multi-threaded way to provide highly acc...

Intelligent Transportation System (ITS) is one of the most important urban systems that its functionality affects other urban systems directly and indirectly. In developing societies, increasing the transportation system efficiency is an important concern, because variety of problems such as heavy traffic condition, rise of the accident rate and the reduced performance happen with the rise of p...

Asadullah Mirasi, Ehsan Kamran Mousarreza Samadi

With the continuous development of the industrialization process, the countries all over the world gradually appeared lack of agricultural labor force and aging phenomenon, which was especially prominent in developed countries. However the agricultural robot with high operating efficiency, high qualities of work will play an increasingly important role in future agricultural production. Robot n...

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