The use of differential GPS is becoming increasingly popular for real-time navigation systems. As these systems migrate to safety-of-life applications (e.g. precision approach and landing), their integrity becomes more important than their accuracy. One method for increasing both accuracy and integrity is the use o f weighting in the navigation solution. This method uses a priori information to...

A new GPS positioning algorithm for vehicle tracking namely the “Minimum Range Error Algorithm” (MRERA) was proposed by E. Mok and L. Lam, to track vehicles in dense high-rise environments without the use of dead reckoning, and it can also be used for general geolocation positioning applications. With this algorithm, it is possible to identify which section of road network the mobile user is lo...

Inverse modeling of CO2 sources and sinks using satellite data: A synthetic inter-comparison of measurement techniques and their performance as a function of space and time S. Houweling, F.-M. Breon, I. Aben, C. Rödenbeck, M. Gloor, M. Heimann, and P. Ciais National Institute for Space Research (SRON), Utrecht, The Netherlands Laboratoire des Sciences du Climate et de l’Environnement, Gif sur Y...

This paper gives an overview of the recent progress made in the use and application of geographical information systems (GIS) and remotely sensed (RS) satellite sensor data for the epidemiology and control of schistosomiasis in sub-Saharan Africa. Details are given of the use of GIS to collate, map and analyse available parasitological data. The use of RS data to understand better the broad sca...

We study the well-known Maximum Independent Set (MIS) problem and introduce the notion of satellites of a node. Branching on nodes with satellites is extremely simple. Nevertheless, satellites can be used to overcome a couple of hard cases in previous algorithms. Together with the notion of mirrors, introduced by Fomin, Grandoni, and Kratsch, they can be used to solve MIS in time bounded by O(1...

We examine formation conditions for the Galilean satellites in the context of models of late-stage giant planet accretion and satellite-disk interactions. We first reevaluate the current standard, in which the satellites form from a ‘‘minimum mass subnebula ’’ disk, obtained by augmenting the mass of the current satellites to solar abundance and resulting in a disk mass containing about 2% of J...

This study addresses the potential contribution of the first pair of Galileo FOC satellites sent into incorrect highly eccentric orbits for geodetic and surveying applications. We began with an analysis of the carrier to noise density ratio and the stochastic properties of GNSS measurements. The investigations revealed that the signal power of E14 & E18 satellites is higher than for regular Gal...

Absract Magnetic actuation utilizes the mechanic torque that is the result of interaction of the current in a coil with an external magnetic field. A main obstacle is, however, that torques can only be produced perpendicular to the magnetic field. This actuation principle has been a topic of research since earliest satellites were launched. Magnetic control has been applied for nutation damping...

To reduce the sampling rate in global navigation satellite system (GNSS)-radio occultation receivers, it is essential to establish a suitable estimation of Doppler frequency from the received signal in the satellite onboard receiver. This receiver is usually located on low earth orbit satellite and receives GNSS satellites signal in the occultation situation. The occurred Doppler on the signal ...