Marine Navigation with NAVSTAR/Global Positioning System (GPS) Today and in the Future

1982 ◽  
Vol 36 (1) ◽  
pp. 9-28 ◽  
Author(s):  
David E. Wells ◽  
Demitris Delikaraoglou ◽  
Petr Vaníč
Keyword(s):  
Global Positioning System ◽  
Navigation System ◽  
Positioning System ◽  
Eastern Canada ◽  
Satellite Navigation System ◽  
Satellite Constellation ◽  
Global Positioning ◽  
The Future ◽  
Gps System ◽  
Marine Navigation

The principles of operation of the NAVSTAR/GPS system are described within the context of the more familiar shore-based radionavigation systems, and of the Transit satellite navigation system. The present GPS satellite constellation of up to six prototype satellites, and the eventual constellation of up to 18 operational satellites are described. Some details of GPS signal structure, receiver operation, and error models are given. Results of our simulations of 1980 GPS marine navigation performance off eastern Canada are presented. These indicate GPS is presently capable of providing 150 m or better real-time positioning for about 11 hours a day in this region. GPS performance in the future is discussed.

scholarly journals The global positioning system, relativity, and extraterrestrial navigation

2009 ◽  
Vol 5 (S261) ◽  
pp. 22-30 ◽  
Author(s):  
Neil Ashby ◽  
Robert A. Nelson
Keyword(s):  
Global Positioning System ◽  
Navigation System ◽  
World Wide ◽  
Relativistic Effects ◽  
Atomic Clocks ◽  
Positioning System ◽  
Navigation Systems ◽  
Time Transfer ◽  
Global Positioning ◽  
The Future

AbstractRelativistic effects play an important role in the performance of the Global Positioning System (GPS) and in world-wide time comparisons. The GPS has provided a model for algorithms that take relativistic effects into account. In the future exploration of space, analogous considerations will be necessary for the dissemination of time and for navigation. We discuss relativistic effects that are important for a navigation system such as at Mars. We describe relativistic principles and effects that are essential for navigation systems, and apply them to navigation satellites carrying atomic clocks in orbit about Mars, and time transfer between Mars and Earth. It is shown that, as in the GPS, relativistic effects are not negligible.

Solving the Grid-to-Ground Problem when Using High Precision GNSS in Archaeological Mapping

2014 ◽  
Vol 2 (2) ◽  
pp. 138-143 ◽  
Author(s):  
William (Fred) Limp ◽  
Adam Barnes
Keyword(s):  
Real Time ◽  
High Precision ◽  
Global Positioning System ◽  
Navigation System ◽  
Survey Methods ◽  
Archaeological Sites ◽  
Positioning System ◽  
Global Satellite Navigation System ◽  
Satellite Navigation System ◽  
Global Positioning

AbstractIncreasingly, high-precision GPS/GNSS (global positioning system/global satellite navigation system) based real-time-kinematic methods are being used in the mapping of archaeological sites. However, when utilizing high-precision satellite-based methods for archaeological location purposes, there is a significant but usually unanticipated problem that must first be addressed if accurate measurements are to be made. Simply put, unless proper correction methods are used, horizontal distances between two locations determined by the GNSS method will differ from the measurements that are made by traditional survey methods. This difference between the two measurements is often referred to as the grid-to-ground problem. This article provides a process to address this problem.

scholarly journals Use of Data from Satellite Navigation System in Operational and Strategic Management of Transport in Cities

2019 ◽  
Vol 49 (4) ◽  
pp. 297-320
Author(s):  
Jacek Oskarbski ◽  
Krystian Birr ◽  
Karol Żarski
Keyword(s):  
Strategic Management ◽  
Global Positioning System ◽  
Navigation System ◽  
Positioning System ◽  
Traffic Models ◽  
Satellite Navigation System ◽  
Use Of Data ◽  
Global Positioning ◽  
Using Data ◽  
Transport Management

Abstract The article presents the possibilities of using data from the Global Positioning System for the development of traffic models and examples of use this data in the transport management. Traffic models are useful tools in planning and evaluation of transport solutions, but also can be used for current, operational transport management.

Consistency analysis of global positioning system position errors with typical statistical distributions

2021 ◽  
pp. 1-18
Author(s):  
Mariusz Specht
Keyword(s):  
Normal Distribution ◽  
Global Positioning System ◽  
Position Error ◽  
Statistical Distribution ◽  
Positioning System ◽  
Statistical Distributions ◽  
Position Errors ◽  
Global Positioning ◽  
Gps System ◽  
Best Fit

Abstract Research into statistical distributions of φ, λ and two-dimensional (2D) position errors of the global positioning system (GPS) enables the evaluation of its accuracy. Based on this, the navigation applications in which the positioning system can be used are determined. However, studies of GPS accuracy indicate that the empirical φ and λ errors deviate from the typical normal distribution, significantly affecting the statistical distribution of 2D position errors. Therefore, determining the actual statistical distributions of position errors (1D and 2D) is decisive for the precision of calculating the actual accuracy of the GPS system. In this paper, based on two measurement sessions (900,000 and 237,000 fixes), the distributions of GPS position error statistics in both 1D and 2D space are analysed. Statistical distribution measures are determined using statistical tests, the hypothesis on the normal distribution of φ and λ errors is verified, and the consistency of GPS position errors with commonly used statistical distributions is assessed together with finding the best fit. Research has shown that φ and λ errors for the GPS system are normally distributed. It is proven that φ and λ errors are more concentrated around the central value than in a typical normal distribution (positive kurtosis) with a low value of asymmetry. Moreover, φ errors are clearly more concentrated than λ errors. This results in larger standard deviation values for φ errors than λ errors. The differences in both values were 25–39%. Regarding the 2D position error, it should be noted that the value of twice the distance root mean square (2DRMS) is about 10–14% greater than the value of R95. In addition, studies show that statistical distributions such as beta, gamma, lognormal and Weibull are the best fit for 2D position errors in the GPS system.

scholarly journals An autonomous navigational system using GPS and computer vision for futuristic road traffic

2022 ◽  
Vol 12 (1) ◽  
pp. 179
Author(s):  
Prabha Ramasamy ◽  
Mohan Kabadi
Keyword(s):  
Computer Vision ◽  
Global Positioning System ◽  
Navigation System ◽  
Autonomous Navigation ◽  
Road Traffic ◽  
Positioning System ◽  
Traffic System ◽  
Global Positioning ◽  
Navigational System

Navigational service is one of the most essential dependency towards any transport system and at present, there are various revolutionary approaches that has contributed towards its improvement. This paper has reviewed the global positioning system (GPS) and computer vision based navigational system and found that there is a large gap between the actual demand of navigation and what currently exists. Therefore, the proposed study discusses about a novel framework of an autonomous navigation system that uses GPS as well as computer vision considering the case study of futuristic road traffic system. An analytical model is built up where the geo-referenced data from GPS is integrated with the signals captured from the visual sensors are considered to implement this concept. The simulated outcome of the study shows that proposed study offers enhanced accuracy as well as faster processing in contrast to existing approaches.

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