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One of the current limitations to evaluate the impact of a realistic multipath environment over a GNSS receiver is the high number of multipath rays that are needed to model the channel in a HW RF constellation simulator. That makes necessary the application of reduction techniques to decrease the number of channels per satellite to be simulated. The initial evaluation of two reduction techniques...
Constant monitoring and control of parameters during road construction are significant for the quality and durability of the road. More than 90% of the total road network has an asphalt surface which must be regularly repaired or rebuild. An increasing lifetime will result in reduction of cost of road maintenance. Key factors are to optimally manage truck fleets, operate the paver, and steer the compactors...
The further development of navigation receivers has to go hand in hand with the advances in the constellations for Global Navigation Satellite Systems (GNSS). As more and more features will be provided by the services of modernized GPS, GLONASS and the upcoming Galileo and Compass, the functions and performance of spaceborne GNSS receivers have to be extended as well. Today, the MosaicGNSS Receiver...
In indoor and urban canyon environments, where the Global Navigation Satellite System (GNSS) line-of-sight signals are very weak, accurate localization using GNSS alone is very challenging. So, it becomes necessary to combine GNSS technology with other wireless systems for proper localization. Recently, various forms of Bayesian filters have been used for combining the sensor information in order...
In this paper, the difference in performance between using a matched filter and an integrate and dump filter to implement a correlator in a GPS receiver is studied; in case of infinite and of limited bandwidth; and in case of infinite and of finite sampling frequency. Obviously, the matched filter outperforms the much easier to implement integrate and dump filter on accuracy of synchronization and...
The E5 and E6 bands, which will be used by Galileo, will have to be shared with many ground-based applications in the aeronautical, communications and military domains. It becomes crucial to evaluate the effects of interference from terrestrial sources on the performance of GNSS Receivers. In order to solve this issue, the data recording in different locations (e.g. urban, rural and airport) in addition...
It is known that parameter estimation is present in any type of navigation systems. Signal Time-Of-Arrival (TOA) estimation accuracy is fundamental to the functioning of Global Navigation Satellite Systems (GNSS). This work investigates the Ziv-Zakai bound (ZZB) as a theoretical performance limit in TOA estimation. This bound has no constraint in terms of applicability, but becomes not attractive...
The poster presents functionalities, applications and methods of SISNeT utilization. The information about SISNeT software and applications provided in this poster is generic and does not cover SISNeT technology in detail but highlights the potential impact of the SISNeT software and applications on the dissemination of EGNOS augmentation technology. SISNeT online services are sources of EGNOS messages...
In aeronautics, Receiver Autonomous Integrity Monitoring (RAIM) techniques based on GPS L1 measurements are currently used in En-route and NPA operations, but not in those that require vertical guidance (APV operations/LPV procedures like LPV200). For these phases of flight SBAS, GBAS or classical ILS navaids are used because they offer better performance than GPS RAIM. However, in future RAIM performance...
This paper presents the latest development in SSTL's successful SGR range of Space GNSS Receivers. The SGR-ReSI (Remote Sensing Instrument) is a highly versatile and uniquely capable GNSS receiver that has been designed with the low-cost, microsatellite market in mind. Based on COTS parts, the SGR-ReSI builds on the expertise SSTL and SSC have developed in the field of GNSS signals, navigation and...
In this paper the concept of Software Defined Radio (SDR) and its use in modern GNSS receiver is highlighted demonstrating how software receivers are important in many situations especially for verification and validation. After a brief introduction of gLab, a fully software high modular tool to generate, process and analyze current and future GNSS signals, the different software modules will be described...
We present two algorithms for indoor positioning in peer-to-peer networks. The setup is a network of two types of devices: reference devices with a known location, and user devices that can determine distances to reference devices and each other. We present two algorithms for positioning estimation in such a peer-to-peer network. The first one is purely geometric and reduces determining the best estimate...
The increase in navigation accuracy demanded by EGNOS and Galileo and their future evolution encourages the study and design of advance receiver architectures. In that direction, the ADIBEAM project focuses on the design of high accuracy ground stations, specifically GNSS Reference Stations, in order to improve its robustness in front of multipath and interference errors with the goal of achieving...
The performance of the Space Alternating Generalized Expectation Maximisation (SAGE) algorithm for multipath mitigation is assessed in this paper. Numerical simulations have already proven the potential of SAGE in navigation context, but practical aspects of the implementation of such a technique in a GNSS receiver are the topic for further investigation. In this paper, we will present the first results...
Positioning accuracy is typically evaluated assuming that measurement errors are identically Gaussian distributed zero-mean and uncorrelated. For these conditions, Geometrical Dilution Of Precision (GDOP) alone is typically used as a satellite selection criterion. However, this is an idealization that leads to suboptimal results. Under this assumption, a satellite selection method based on convex...
Global navigation satellite systems (GNSS) are highly susceptible to interference, due to their low signal power. This paper studies the impact of DVB-T on the GPS L1 and Galileo E1 frequency band. An analytical tool has been developed to evaluate the probability of detection in the presence of interference, taking into account the possible effects of fading on the GNSS signal. Further, the tracking...
A multipath model for the aeronautical channel, which was derived from a channel measurement campaign, has been implemented into hardware simulators. The way of implementation is described in detail and simulation results obtained with a GNSS receiver and showing the impact of multipath are presented.
GNSS-based Road User Charging (RUC) systems are particularly interesting because of their flexibility and reduced roadside infrastructure. At present, truck toll collection systems based on GPS receivers installed on the vehicles are already deployed in German and Slovak motorways. Reliability of road tolling systems is fundamental in order to limit the loss of revenue because of undercharging and...
In this paper we present the Acquisition Speed Up Engine (ACSE) algorithm, devised in 2007 by Thales Alenia Space in the framework of studies for the GIRASOLE receiver and implemented by Consorzio Pisa Ricerche. The algorithm is used to fast detect the presence of a CDMA signal in a time/frequency uncertainty domain. This is made possible with a serial/parallel approach and a modified FFT algorithm...
Satellite Navigation has become a keystone for the development of Europe and its citizens. It is then essential to provide adequate educational programmes so to ensure a prepared workforce for the GNSS sector in Europe. In this context, ESA has launched a complete Satellite Navigation Educational program, called EDUNAV, aiming at providing up-to-date GNSS based educational material and educational...
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