In an urban environment, the occlusion of satellite broadcasts varies across space and thus, preplanning for collection of GPS points requires consideration of these obstructions. This paper presents a GIS embedded model (ArcGIS and ArcObjects) for predicting GPS error via modeling PDOP in an urban environment. The "skyview" model predicted PDOP for spatial locations as a function of the percen...

The utilization of Global Navigation Satellite System (GNSS) is becoming an attractive navigation approach for geostationary orbit (GEO) satellites. A high-sensitivity receiver compatible with Position (GPS) developed by the United States and BeiDou (BDS) China has been used in a GEO satellite named TJS-5 to demonstrate feasibility real-time navigation. According inflight data, GNSS signal char...

Abstract The paper presents the results of research on determination accuracy parameter for European Geostationary Navigation Overlay System (EGNOS) positioning a dual set on-board global navigation satellite system (GNSS) receivers. study focusses in particular presenting modified algorithm to determine EGNOS mixed model with measurement weights. mathematical considers weights as function squa...

Global Navigation Satellite Systems (GNSS) are not only used in terrestrial applications, but also Low-Earth orbit satellites and higher altitude missions. NASA’s Magnetospheric Multiscale (MMS) mission has demonstrated the capabilities of existing GNSS systems to provide positioning, navigation, timing (PNT) services Cis-lunar space. The resurgence plans by national space agencies for Lunar ex...

Abstract The autonomous navigation of the spacecrafts in High Elliptic Orbit (HEO), Geostationary Earth (GEO) and Transfer (GTO) based on Global Navigation Satellite System (GNSS) are considered feasible many studies. With completion BeiDou with Coverage (BDS-3) 2020, there at least 130 satellites providing Position, Navigation, Timing (PNT) services. In this paper, considering latest CZ-5(Y3) ...

In this paper, we present two such examples of visualisation exploring spatial uncertainty which benefit from the use of VR technology. First, we present a real-time simulation of Global Positioning Systems (GPS) satellite geometry is carried out in a virtual environment of the University campus. The number of satellites visible to the receiver is modelled in real time as a user walks through t...