Results 211 to 220 of about 18,020 (267)
Some of the next articles are maybe not open access.
QoS of Internet Access with GPRS
Wireless Networks, 2001In this paper we examine the effects of Internet traffic on the Quality of Service (QoS) in GPRS wireless networks. With a stochastic source traffic model describing the user behavior, we will derive subjective and objective Quality of Service measures in terms of WWW downloading time and the transmission bandwidths on TCP and TBF level.
Dirk Staehle +2 more
openaire +1 more source
Development of an array-antenna GPR system (SAR-GPR)
SPIE Proceedings, 2005SAR-GPR is a sensor system composed of a GPR and a metal detector for landmine detection. The GPR employs an array antenna for advanced signal processing for better subsurface imaging. This system combined with synthetic aperture radar algorithm, can suppress clutter and can image buried objects in strongly inhomogeneous material.
Motoyuki Sato +5 more
openaire +1 more source
2015
Antennas are a critical hardware component of a radar system, dictating its performance in terms of capability to detect targets. In this Chapter, a wide review on Ground-Penetrating Radar (GPR) antennas is given. Firstly, the gen- eral characteristics of GPR antennas are resumed and the requirements they have to satisfy are listed: these are somehow ...
PAJEWSKI, Lara +2 more
openaire +2 more sources
Antennas are a critical hardware component of a radar system, dictating its performance in terms of capability to detect targets. In this Chapter, a wide review on Ground-Penetrating Radar (GPR) antennas is given. Firstly, the gen- eral characteristics of GPR antennas are resumed and the requirements they have to satisfy are listed: these are somehow ...
PAJEWSKI, Lara +2 more
openaire +2 more sources
Numerical and Field Investigations of GPR: Toward an Airborne GPR
Subsurface Sensing Technologies and Applications, 2003The main objective of our work is to explore the feasibility of designing an airborne RADAR system much like the University of Texas Institute for Geophysics airborne ice-penetrating radar systems for use in the detection of underground structures. Here we summarize our initial efforts toward achieving this goal.
Mrinal K. Sen +3 more
openaire +1 more source
GPR-PRO: A MATLAB module for GPR data processing
Proceedings of the XIII Internarional Conference on Ground Penetrating Radar, 2010GPR-Pro, is a flexible and user friendly module developed in MATLAB for processing mainly GPR data. This module can handle the most common GPR data formats. It provides a large number of signal processing algorithms including Principal Component Analysis, FK filtering, data manipulation (matrix algebra), attributes analysis as well as toolboxes for ...
S N Spanoudakis, A Vafidis
openaire +1 more source
2009
Solving subsurface problems in the field of archaeology without destructively intervening with the buried materials has become a prime focus of the archaeological community. The science to study, measure and quantify archaeological structures remotely has been designated as the field of Archaeometry. Remotely detecting archaeological structures is very
Goodman D +7 more
openaire +3 more sources
Solving subsurface problems in the field of archaeology without destructively intervening with the buried materials has become a prime focus of the archaeological community. The science to study, measure and quantify archaeological structures remotely has been designated as the field of Archaeometry. Remotely detecting archaeological structures is very
Goodman D +7 more
openaire +3 more sources
GPR-based adaptive sensing - GPR manipulation according to terrain configurations
2004 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS) (IEEE Cat. No.04CH37566), 2005In this paper, we introduce an adaptive sensing method to a landform using a ground reflection of a ground penetrating radar (GPR). When GPR scans a ground surface, an antenna of GPR should be put on a ground as an ideal condition. The farther an antenna is put away from a ground, the shallower the sensing depth becomes, because a ground surface ...
Yasuhisa Hasegawa +3 more
openaire +1 more source
A bandwidth-on-demand strategy for GPRS
IEEE Transactions on Wireless Communications, 2005General packet radio service (GPRS) is a global system for mobile communications (GSM) packet data service. In order to efficiently accommodate GPRS traffic while maintaining the desired service quality of GSM calls, we propose a GPRS bandwidth-allocation strategy called the bandwidth-on-demand (BoD) strategy. The BoD strategy is adaptive to the change
Yieh-Ran Haung, Yi-Bing Lin
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A mobility management strategy for gprs
IEEE Transactions on Wireless Communications, 2003In general packet radio service (GPRS), a mobile station (MS) is tracked at the cell level during packet transmission, and is tracked at the routing-area (RA) level when no packet is delivered. A READY timer (RT) mechanism was proposed in 3GPP 23.060 to determine when to switch from cell tracking to RA tracking.
Yi-Bing Lin, Shun-Ren Yang
openaire +1 more source
Advanced GPR for archaeological survey
2013 IEEE International Geoscience and Remote Sensing Symposium - IGARSS, 2013An array GPR system equipped with 8 transmitting and 8 receiving antennas has been developed at Tohoku University, Japan. It is a Stepped Frequency Continuous Wave system and operates at 50MHz-1.5GHz. The maximum speed of data acquisition is 7km/h, when the data is acquired every 1cm density.
Motoyuki Sato +2 more
openaire +1 more source