This paper addresses the problem of path following for unmaned cars using only GNSS positionning. Several papers have already addressed the lane keeping, usually restricting the focus to the computation of the optimal steering wheel angle, therefore usually offering a good solution in either straight lines or curves, but rarely both. Moreover the GNSS receiver have a sampling time higher than t...

This contribution focuses on geodetic sensor systems and sensor networks for positioning and applications. The key problems in this area will be addressed together with an overview of applications. Global Navigation Satellite Systems (GNSS) and other geodetic techniques play a central role in many applications like engineering, mapping and remote sensing. These techniques include precise positi...

s: The future GALILEO system will use multi-frequency data to process, which may eliminate preferably the influence of ionosphere relay. So the VPL estimation is mainly to consider how to efficiently use the satellite Signal-InSpace (SISE). To efficiently utilize SISE in GNSS and to rationally estimate the user Vertical Protection Level, it is the key to ensure normal application of GNSS and us...

Peter de Bakker graduated in 2007 at the faculty of Aerospace Engineering from Delft University of Technology. He started as a PhD candidate at the Delft University of Technology in 2008 on the subject of precise point positioning and integrity monitoring. Hans van der Marel is assistant professor at the Delft University of Technology, The Netherlands. He is currently involved in research on hi...

The poor satellite visibility and the weak signal power of the Global Positioning System (GPS) signal reception in side lobes are the main constraint on the Geostationary Earth Orbit (GEO) determination, however, the situation will improve when multi-constellation Global Navigation Satellite Systems (GNSS) become available in the near future. In this study, a navigation algorithm is developed i...

Airborne LiDAR surveys produce high-resolution, very accurate surface elevation models which are used for many applications in surveying and civil engineering, as well as for flood prevention and mitigation, monitoring coastal erosion and land subsidence, etc. The key to producing high quality elevation products is very precise geolocation and orientation (or “georeferencing”) of the LiDAR inst...

This two-part paper reviews recent innovations in circuit design that have accelerated the miniaturization of sensor nodes. In this second part of the paper, we focus on key building blocks of miniaturized sensor nodes, such as data transceivers, energy harvesters, power management units, and digital logic circuits. System level design considerations are also discussed to provide guidelines for...

The paper focuses on a comparison of different positioning methods provided by free and open source software (FOSS) package called RTKLIB. The RTKLIB supports real‐time and post‐processed positioning. The most important modes of operation tested by the authors are Kinematic, Static, Fixed and Precise Point Positioning (PPP). The data for evaluation were obtained ...

This paper proposes a new GNSS user level integrity monitoring scheme for the detection and exclusion of simultaneous multiple failures. It addresses the weakness of the current methods that assume a single failure a time. The new approach, referred to as the “group separation method”, can be used either in the receiver autonomous integrity monitoring (RAIM) mode or its extension the user auton...

The ionosphere is the main error source in GNSS measurements and in extreme cases can degrade significantly the positioning with errors exceeding 100 m; therefore modelling and predicting this type of error is crucial and critical. The ionospheric effect can be reduced using different techniques such as dual-frequency receiver or suitable augmentation system (DGPS, SBAS); the aforesaid approach...