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  • Articles  (317)
  • Hindawi  (317)
  • American Meteorological Society
  • Blackwell Publishing Ltd
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  • Institute of Electrical and Electronics Engineers
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  • Springer Science + Business Media
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  • International Journal of Navigation and Observation  (105)
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  • Architecture, Civil Engineering, Surveying  (317)
  • Geography  (147)
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  • Articles  (317)
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  • Hindawi  (317)
  • American Meteorological Society
  • Blackwell Publishing Ltd
  • Copernicus
  • Institute of Electrical and Electronics Engineers
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  • Architecture, Civil Engineering, Surveying  (317)
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  • 1
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    Navigation Facility for High Accuracy Offline Trajectory and Attitude Estimation in Airborne Applications (2013)
    Hindawi
    Details
    Publication Date: 2013-09-06
    Description: The paper focuses on a navigation facility, relying on commercial-off-the-shelf (COTS) technology, developed to generate high-accuracy attitude and trajectory measurements in postprocessing. Target performance is cm-level positioning with tenth of degree attitude accuracy. The facility is based on the concept of GPS-aided inertial navigation but comprises carrier-phase differential GPS (CDGPS) processing and attitude estimation based on multiantenna GPS configurations. Expected applications of the system include: (a) performance assessment of integrated navigation systems, developed for general aviation aircraft and medium size unmanned aircraft systems (UAS); (b) generation of reference measurements to evaluate the flight performance of airborne sensors (e.g., radar or laser); and (c) generation of reference trajectory and attitude for improving imaging quality of airborne remote sensing data. The paper describes system architecture, selected algorithms for data processing and integration, and theoretical performance evaluation. Experimental results are also presented confirming the effectiveness of the implemented approach.
    Print ISSN: 1687-5990
    Electronic ISSN: 1687-6008
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
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  • 2
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    Time Synchronization and Performance of BeiDou Satellite Clocks in Orbit (2013)
    Hindawi
    Details
    Publication Date: 2013-09-06
    Description: The time model of Beidou satellite clocks is analyzed. The general relations of satellite clocks with the system time are studied. The error sources of two-way radio time transfer between satellites and uplink stations are analyzed. The uncertainty of type A is about 0.3 ns in Beidou system. All the satellite clocks in orbit of Beidou satellite navigation system are evaluated by the clock offsets observed by the two-way radio time transfer. The frequency stabilities at a sample time of 10000 s and 1 day for all the satellite clocks are better than . It means that the performance of Beidou satellite clocks in orbit is consistent with the ground test, and the results in orbit are a little better than those in ground vacuum.
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    Topics: Architecture, Civil Engineering, Surveying , Geosciences
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  • 3
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    Kalman Filter-Based Hybrid Indoor Position Estimation Technique in Bluetooth Networks (2013)
    Hindawi
    Details
    Publication Date: 2013-09-23
    Description: This paper presents an extended Kalman filter-based hybrid indoor position estimation technique which is based on integration of fingerprinting and trilateration approach. In this paper, Euclidian distance formula is used for the first time instead of radio propagation model to convert the received signal to distance estimates. This technique combines the features of fingerprinting and trilateration approach in a more simple and robust way. The proposed hybrid technique works in two stages. In the first stage, it uses an online phase of fingerprinting and calculates nearest neighbors (NN) of the target node, while in the second stage it uses trilateration approach to estimate the coordinate without the use of radio propagation model. The distance between calculated NN and detective access points (AP) is estimated using Euclidian distance formula. Thus, distance between NN and APs provides radii for trilateration approach. Therefore, the position estimation accuracy compared to the lateration approach is better. Kalman filter is used to further enhance the accuracy of the estimated position. Simulation and experimental results validate the performance of proposed hybrid technique and improve the accuracy up to 53.64% and 25.58% compared to lateration and fingerprinting approaches, respectively.
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  • 4
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    Experimental Evaluation of Cooperative Relative Positioning for Intelligent Transportation System (2014)
    Hindawi
    Details
    Publication Date: 2014-12-01
    Description: Support system for safe driving heavily depends on global navigation satellite system. Pseudoranges between satellites and vehicles are measured to compute vehicles’ positions and their relative positions. In urban areas, however, multipath errors (MPEs) in pseudoranges, caused by obstruction and reflection of roadside buildings, greatly degrade the precision of relative positions. On the other hand, simply removing all reflected signals might lead to a shortage of satellites in fixing positions. In our previous work, we suggested solving this dilemma by cooperative relative positioning (CoRelPos) which exploits spatial correlation of MPEs. In this paper, we collected the trace data of pseudoranges by driving cars in urban areas, analyzed the properties of MPEs (specifically, their dependency on signal strength, elevation angles of satellites, and receivers’ speeds), and highlighted their spatial correlation. On this basis, the CoRelPos scheme is refined by considering the dynamics of MPEs. Evaluation results under practical vehicular scenarios confirm that properties of MPEs can be exploited to improve the precision of relative positions.
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    Topics: Architecture, Civil Engineering, Surveying , Geosciences
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  • 5
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    “Trench Town Rock”: Reggae Music, Landscape Inscription, and the Making of Place in Kingston, Jamaica (2013)
    Hindawi
    Details
    Publication Date: 2013-01-01
    Description: This paper examines place inscriptions in Trench Town, Jamaica, and explores the ways these are used to reinforce, shape, or challenge dominant images of this inner-city community. On one hand, Trench Town is like many of its neighbouring communities, characterised by high levels of poverty, unemployment, political and gang violence, derelict buildings, and overcrowded homes. On the other hand, Trench Town is iconic and unique as it is recognised worldwide for being the birth place of reggae music and home to a number of well-known reggae artists including reggae superstar Bob Marley. Today, Trench Town’s landscape is filled with inscriptions reminiscent of its rich cultural past. Linked to this is a conscious effort by its residents to identify themselves with reggae music and to recapture and sustain the positive legacies that have made the community popular. This is manifested in the numerous murals, statues, and graffiti seen throughout the community evoking past images of reggae music icons such as Marley and Tosh alongside renowned black leaders such as Marcus Garvey. These inscriptions are conceived as texts and are seen as part of a broader discourse on issues relating to urban spatial identity, commoditisation, exclusion, struggle, resistance, and change.
    Print ISSN: 2090-4185
    Electronic ISSN: 2090-4193
    Topics: Architecture, Civil Engineering, Surveying , Geography
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  • 6
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    Grade Point Average Differences between Dual and Nondual Credit College Students (2013)
    Hindawi
    Details
    Publication Date: 2013-02-21
    Description: We examined the first and final term grade point averages (GPA) for a class of students at a Texas community college to determine how dual enrollment credit influenced GPA. Five statistically significant differences, albeit small effect sizes, were present by gender and by ethnic membership. Dual credit students had higher GPAs than did nondual credit students. Interestingly, dual enrollment did not have a statistically significant influence on GPAs for Asian students or for students after two years at this community college. As such, this study is the first research investigation of which we are aware in which student GPA in the first college semester and at the end of the second year was compared between dual credit and nondual credit students. Implications of our findings and suggestions for future research are provided.
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  • 7
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    Diversity Management in the Canadian Workplace: Towards an Antiracism Approach (2012)
    Hindawi
    Details
    Publication Date: 2012-11-15
    Description: Most diversity management programs in Canada maintain that enhancing workforce diversity is of tremendous significance for business organizations in today’s competitive global urban markets. Since well-meaning diversity management initiatives have been largely ineffective thus far in dealing with workplace discrimination and racism in the Canadian workplace, this paper underscores the need to decenter the focus of diversity management from a business imperative to an antidiscrimination and social justice imperative. Within this latter perspective, the paper examines the strengths and limitations of the antiracism approach that has been implemented in various developed countries in recent years. The antiracism approach is an action-oriented strategy for institutional and systemic change that has at its core the interrogation of privilege, power disparities, and other forms of inequity within the organization. Drawing from the lessons of various initiatives that have utilized this approach, the present paper emphasizes the need for a nuanced antiracism approach in the multicultural Canadian society if diversity management is to attain its goal of greater inclusion of all individuals in informal networks and formal organizational programs.
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  • 8
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    The Spatial-Temporal Dynamics of China’s Changing Urban Hierarchy (1950–2005) (2012)
    Hindawi
    Details
    Publication Date: 2012-11-15
    Description: This paper examines the dynamic spatial and temporal patterns of China’s urban hierarchy from 1950 to 2005. We limit the study to mainland China’s 137 urban agglomerations of 750,000 or more population as of 2005. The paper improves upon a classic approach to measuring shifting ranks within an urban hierarchy by applying advanced spatial analysis techniques. We use a Getis-Ord , a space-time Moran scatter plot, and dynamic LISA paths to examine the regional difference and change for these urban agglomerations. Our study revealed a north-south divide in the changing urban hierarchy of China after 1990. The analysis demonstrated that the spatial and temporal shift of urban dominance in China was closely associated with policy and economic factors. The paper concludes with a discussion of the differences across the six different time periods of change from 1950 to 2005.
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  • 9
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    The Coexistence of Humans and Companion Animals in the City Parks of Xanthi: The Views of the Citizens (2012)
    Hindawi
    Details
    Publication Date: 2012-12-11
    Description: Companion animals are very important to people of big cities. In Greece the families which own those animals take them for a walk in the parks and streets of their town but not always with care to not disturb other citizens. Laws and regulations for companion and stray animals are not respected in Greece, although as a result of the Athens Olympics in 2004 the Greek government started to provide funds for the collection, care, and sterilization of stray animals. This paper is a first attempt to record, through the aid of a structured questionnaire, the view of the citizens of the city of Xanthi in northern Greece regarding companion animals and what they do when animals become old. The paper also examines the extent to which the existence of stray and companion animals in parks disturbs the people who visit green areas looking for a place to get a rest or play on the grass. The majority preferred that stray animals are collected off the streets, recorded, treated from parasites, vaccinated, and sterilized and after that are available for adoption or are returned to the area they were found at.
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    Topics: Architecture, Civil Engineering, Surveying , Geography
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  • 10
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    Two-Step Galileo E1 CBOC Tracking Algorithm: When Reliability and Robustness Are Keys! (2013)
    Hindawi
    Details
    Publication Date: 2013-03-07
    Description: The majority of 3G mobile phones have an integrated GPS chip enabling them to calculate a navigation solution. But to deliver continuous and accurate location information, the satellite tracking process has to be stable and reliable. This is still challenging, for example, in heavy multipath and non-line of sight (NLOS) environments. New families of Galileo and GPS navigation signals, such as Alternate Binary Offset Carrier (AltBOC), Composite Binary Offset Carrier (CBOC), and Time-Multiplex Binary Offset Carrier (TMBOC), will bring potential improvements in the pseudorange calculation, including more signal power, better multipath mitigation capabilities, and overall more robust navigation. However, GNSS signal tracking strategies have to be more advanced in order to profit from the enhanced properties of the new signals.In this paper, a tracking algorithm designed for Galileo E1 CBOC signal that consists of two steps, coarse and fine, with different tracking parameters in each step, is presented and analyzed with respect to tracking accuracy, sensitivity and robustness. The aim of this paper is therefore to provide a full theoretical analysis of the proposed two-step tracking algorithm for Galileo E1 CBOC signals, as well as to confirm the results through simulations as well as using real Galileo satellite data.
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    Topics: Architecture, Civil Engineering, Surveying , Geosciences
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