نتایج جستجو برای: ground coverage

تعداد نتایج: 226181  

Journal: :China Communications 2021

A long with the swift growth of communication services, various networks have undergone multidimensional technical evolution, e.g. high transmission speed and large bandwidth for ground cellular network, mobility aviation wide-area coverage satellite network. As industry demands joint operation arise, an integrated space-air-ground collaboration network will be formed.

2011
Arthur C. Clarke

Many signals originating from low powered ground terminals may be observed from a space platform. Significant losses can occur through relaying the raw signals to ground; signal processing on-board the satellite can enhance detection and identification of signals of interest. Interference cancellation using Multi-User Decoding (MUD) techniques further improves sensitivity and is effective at ma...

2013
P. Cruz R. Fierro W. Lu S. Ferrari

In this paper, we are interested in exploiting the heterogeneity of a robotic network made of ground and aerial agents to sense multiple targets in a cluttered environment. Maintaining wireless communication on this type of networks is fundamentally important specially for cooperative purposes. The proposed heterogeneous network consists of ground sensors, e.g., OctoRoACHes, and aerial routers,...

2005
David F. Naar

We planed to conduct a “mowing the lawn” type of multibeam bathymetry and backscatter survey of the Florida Middle Ground HAPC (Habitat Area of Particular Concern; Figure 1) and to collect some ground truth data. The survey was to augment the existing coverage in the area from a previous USF cruise and will entail for the most part very long lines compared to the number of turns (Figure 1). The...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه ارومیه - دانشکده ادبیات و علوم انسانی 1390

the present study was concerned with exploring the frequency and linguistic focus of corrective feedback types given by novice and experienced female teachers working with young learners and compared it with those of elementary classes for adults. moreover, it aimed at measuring learners’ acknowledgement of teachers’ corrective feedback in the form of uptake in relation to linguistic coverage o...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه پیام نور - دانشگاه پیام نور استان تهران - دانشکده علوم انسانی 1392

abstract the present study deals with a comparison between reactive and pre-emptive focus-on-form in terms of application and efficiency. it was conducted in an intermediate english class in shahroud. 15 male learners participated in this research and their age ranged from 18 to 25. a course book, new interchange 3, and a complementary book were used. every session the learners gave lectures o...

2003
Hsing-Chung Chang Ming-han Chen Lijiong Qin Linlin Ge Chris Rizos

Ground subsidence can be caused by both natural and human-induced activities. In this paper, a radar remote sensing technique named Differential Interferometric SAR (D-InSAR) is introduced as means of monitoring the ground deformation caused by mining activities. D-InSAR and current geodetic technologies, such as GPS, are complementary in monitoring ground subsidence due to underground mining a...

Journal: :Data Science Journal 2009
Hirokazu Yamamoto Akihide Kamei Ryosuke Nakamura Naotaka Yamamoto Koki Iwao Satoshi Tsuchida Yoshio Tanaka Satoshi Sekiguchi

Remotely sensed satellite data can provide spatial and temporal coverage for global environmental monitoring. Calibration and validation are very important for more accurate satellite products and can contribute to the detection of climate changes on earth. Calibration and validation of satellite products normally use both ground-based and satellite-based data, which have geospatial metainforma...

Journal: :Robotics and Autonomous Systems 2017
Sotiris Papatheodorou Anthony Tzes Yiannis Stergiopoulos

This article examines the problem of visual area coverage by a network of Mobile Aerial Agents (MAAs). Each MAA is assumed to be equipped with a downwards facing camera with a conical field of view which covers all points within a circle on the ground. The diameter of that circle is proportional to the altitude of the MAA, whereas the quality of the covered area decreases with the altitude. A d...

2016
Sotiris Papatheodorou Anthony Tzes Yiannis Stergiopoulos

This article examines the problem of visual area coverage by a network of Mobile Aerial Agents (MAAs). Each MAA is assumed to be equipped with a downwards facing camera with a conical field of view which covers all points within a circle on the ground. The diameter of that circle is proportional to the altitude of the MAA, whereas the quality of the covered area decreases with the altitude. A d...

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