Global positioning system

Recently, there has been increasing interest within the potential user community of Global Positioning System (GPS) for high precision navigation problems such as aircraft non precision approach, river and harbor navigation, real-time or kinematic surveying. In view of more and more GPS applications, the reliability of GPS is at this issue.The Global Positioning System (GPS) is a space-based radio navigation system that provides consistent positioning, navigation, and timing services to civilian users on a continuous worldwide basis. The GPS system ...

The Local Area Augmentation System (LAAS) is an augmentation of the Global Positioning System (GPS) to allow for precision approach and landing at airports. Stanford University has, with support from U.S. Federal Aviation Administration (FAA), developed a real time prototype of the LAAS Ground Facility (LGF) known as the Integrity Monitor Testbed (IMT). It is used to evaluate whether the LGF can meet the integrity and continuity requirements that apply to aircraft Category I precision approach (i.e. close to the ...

Title: An Image-Based Approach for Tracking Helicopter Longitudinal Tip-Path-Plane Angle An optics-based longitudinal tip-path-plane measurement system has been designed and flown onboard a Bell 206B helicopter. The system is composed of cameras that measure the longitudinal tip-path-plane angle with respect to the fuselage and an air data boom fitted with a horizontal wind vane that measures the free-stream velocity in the longitudinal plane with respect to the fuselage. A global positioning system and inertial mass unit were also included to compare ...

Multipath is the largest error source for modern Global Navigation Satellite Systems (GNSS) receivers (relying on Time of arrival signals and correlation) operating in urban environments. Most current algorithms for detection and mitigation require capturing high bandwidth of the Global Positioning System (GPS) signal (> 8 MHz), which translates to high sample- rate as well. For low cost, low power receivers high bandwidth/sampling rates are not desired, typically around 2-3 MHz bandwidth are utilized. Thus refined algorithms better tailored for ...

This thesis presents a theoretical and practical study of the accuracy attainable with low cost consumer grade GPS devices. It begins with a general introduction to the global positioning system and then goes on to focus on position estimation, error sources, and mitigation techniques. Using differential GPS and post-processing of data it should be possible to achieve accuracies within tens of centimeters even with consumer grade devices, so the practical part focused on the development of a working dGPS system. ...

The U.S Global Positioning System (GPS) is a satellite based navigation system that provides worldwide coverage. Typical use of the system includes positioning and timing. However, it can be used for other applications such as GPS bistatic radar, which in turn can be used for altimetry by calculating the delay between the direct and the reflected signal. It can also be used as a passive system (no user transmitted Radio Frequency, RF, energy) for remote sensing. The basic principle for ...

It is predicted that the market for position-based services is going to reach an annual turnover of billions of dollars in a few years. Besides this, also the game industry is estimated to meet a bright future, and there is a great interest already. This master’s thesis looks at a service that combines these two areas. The result is a position-based game called Mystery that is developed for the handheld computer Compaq iPaq 36-serie, which is well suited for this ...

We are living in the information era, people are getting more mobile and the technology is constantly advancing. Technologies that were once static in location are now becoming mobile and constantly changing position. Information that never changed before must now be dynamic and change as the user is moving around. By providing a location to applications we cannot only change position related information, but also open doors to applications and functions that were not possible before. The Alipes project was initiated ...