Although the impact of ICT-enabled information on firm performance has been well documented in the business value of IT literature, our understanding of how GPS adoption can transform operational decision-making and foster differential firm performance is limited. In response, we conduct an exploratory comparative case study of three transport firms that have implemented the same GPS during the...

The United States Coast Guard is engaged in a project to re-capitalize Reference Station (RS) and Integrity Monitor (IM) equipment used in the Nationwide Differential Global Position System (NDGPS). The Coast Guard in partnership with industry is developing a new software application to run on an open

This article describes the implementation and experimental results of a real-time carrier phase differential global positioning system (GPS) aided inertial navigation system (INS). The implementation is the result of a study to analyze the capabilities of such a system relative to the requirements of advanced vehicle control and safety systems (AVCSS) for intelligent transportation systems. Suc...

The use of differential navigation techniques combined with GLONASS and GPS, collectively referred to as Global Navigation Satellite Service (GNSS), presents maritime authorities with an opportunity to provide highly precise navigation service for harbor entrance and approach areas with a reduced dependence on any one system. The use of 48 satellites (24 GPS and 24 GLONASS) also provides improv...

An effective technique for real-time differential orbit determination with GPS bias fixing is formulated. With this technique, only real-time GPS orbits and clocks are needed (available from the NASA Global Differential GPS System with 10–20 cm accuracy). The onboard, realtime orbital states of user satellites (few meters in accuracy) are used for orbit initialization and integration. An extend...

Using GPS system for positioning is subject to several sources of errors: ionosphere and troposphere delays, signal multi-path, number of visible satellites, satellite geometry/shading... A typical civilian GPS receiver provides 6-12 meters accuracy, depending on number of satellites available. This accuracy can be reduced to 1m by using a DGPS (Differential GPS) system which employs a second r...