Using mobile smart devices to provide urban location-based services (LBS) with sub-meter-level accuracy (around 0.5 m) is a major application field for future global navigation satellite system (GNSS) development. Real-time kinematic (RTK) positioning, which is a widely used GNSS-based positioning approach, can improve the accuracy from about 10-20 m (achieved by the standard positioning servic...

A precise GNSS (Global Navigation Satellite System) localization is vital for autonomous road vehicles, especially in cluttered or urban environments where satellites are occluded, preventing accurate positioning. We propose to fuse GPS (Global Positioning System) data with fisheye stereovision to face this problem independently to additional data, possibly outdated, unavailable, and needing co...

The most accurate mobile station (MS) positioning of today is done using techniques based on time-of-arrival measurements like network assisted GPS and OTDOA. In this paper we present a system for MS positioning based on database comparison of measured location sensitive parameters. We have utilised the estimated channel impulse response (CIR) for comparison. The Box-Cox metric and Kalman filte...

Alison Brown, NAVSYS Corporation ABSTRACT Spaceborne Global Positioning System (GPS) technology is being widely accepted by both the commercial space industry and by NASA as a key enabler for improving space operations. The use of GPS for space missions has resulted in improvements in space vehicle autonomy and reduced design and operations cost. The current GPS constellation includes 24 MEO sa...

The Global Positioning System (GPS) has risen from a mere paper design in the early 1970s to become a global utility of the 21st century. The system is used for diverse applications that include navigation of ground vehicles, ships, aircraft, and spacecraft, monitoring of millimeter-level shifts of the Earth's tectonic plates, and the precise timing of financial transactions and electrical powe...

The Global Positioning System (GPS) is a satellite-based technology that has truly revolutionised many positioning and navigation activities, and today stands unchallenged as the ‘first choice’ position determination technology for all outdoor applications. GPS is global, works in all weather conditions, is available 24hrs a day and is free of user charges. Thanks to the revolution in microelec...

The availability of large-scale databases containing street-level panoramic images offers the possibility to perform semi-automatic surveying of real-world objects such as traffic signs. These inventories can be performed significantly more efficiently than using conventional methods. Governmental agencies are interested in these inventories for maintenance and safety reasons. This paper introd...

The issue of collision avoidance in road vehicles has been investigated from many different points of view. An interesting approach for Road Vehicle Collision Assistance Support Systems (RVCASS) is based on the creation of a scene of the vehicles involved in a potentially conflictive traffic situation. This paper proposes a neuro-fuzzy approach for dynamic classification of the vehicles roles i...

A fundamental component of the Global Positioning System is the calculation of a highly accurate predicted orbit for each of the constellation spacecraft on a regular basis. In general, the parameters used to describe these orbits are not stable and need to be constantly updated. Being able to predict changes, and also being able to calculate the orbit after the fact, relies upon a combination ...