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The European GNSS, Galileo, is currently in its In-Orbit Validation (IOV) phase where four satellites are finally available for computing the user position. In this phase, the analysis of the measurements obtained from the IOV satellites can provide insight on the performance and potentialities of the Galileo system. In this paper, a methodology based on the use of precise orbits and ionospheric corrections...
The Multiplexed Binary Offset Carrier (MBOC) signal has been recommended as optimized modulation on L1/El frequency band by both United States and European Union communities. MBOC signal is defined on the basis of its spectrum, while different time waveforms can be selected as possible modulation candidates. In this paper we present the different options of the new optimized MBOC signal in both time...
A Carrier-to-Noise spectral density-based criterion for selecting Binary Offset Carrier signals (both sine and cosine) for the purpose of a cognitive tracking unit is derived in this letter. The paper presents the C/N_0 gap between two signals in terms of positioning capability expressed via the Cramer Rao lower bounds on time-delay estimation accuracy.
High sensitivity receivers and multiple satellite constellations have vastly improved GNSS signal availability in dense urban areas. However, accuracy remains a problem due to the blockage and reflection of many of the signals by buildings and other obstacles. Reliable metres-level positioning in dense urban areas is difficult to achieve cost-effectively using a single technology. The way forward...
The asphalt road construction, as well as the quality of the road, relies nowadays to a great extend on the experience of the road construction workers. The development of a system for machine control and fleet management on an asphalt road construction site, which enables building roads of better quality and durability, was the main objective of the described work. Especially the mass flow of asphalt...
This paper presents the key elements of the next generation of miniaturised GNSS space receivers in the European Space Agency (ESA) compatible with the new and more robust GNSS signals from Galileo, modernized GPS, Glonass and Compass-Beidou. A quick review of applications like Precise Orbit Determination (POD) and Radio Occultation (RO) is provided together with the performance achieved in current...
Every GNSS user is interested in having high accuracy PVT solutions. However, for most mass market applications like location based services or road navigation, having a first position fix within few seconds is more important than waiting some time for an accurate solution. One of the biggest contributions to the TTFF is the time needed to retrieve the navigation data coming with the data message...
The ESA (European Space Agency) fundamental physics mission ACES (atomic clock ensemble in space) on the ISS (International Space Station) has a high demand on orbit determination and orbit prediction accuracy to fulfill its scientific goals. Therefore the experiment will be equipped with a multi-frequency JAVAD GNSS receiver. Due to constructional reasons, the GNSS antenna will be tilted from the...
We have developed a Real Time Kinematic (RTK) navigation system that uses pseudolite signals in addition to the GNSS satellite signals. This RTK+ system can be used under shadowed conditions where satellite signals alone do not provide satisfactory availability or performance. Such conditions exist for example under a large harbor crane, where continuous positioning of straddle carriers handling the...
The deployment of Galileo and the modernization GPS will provide additional signals with increasingly complex modulations and multiplexing schemes, enabling performance enhancements in terms of availability, accuracy, and robustness. With the Galileo Initial Operational Capability (IOC) scheduled around mid-decade with fourteen satellites already ordered in January 2010, 4 additional ordered in 2012...
The ATENEA (Advanced Techniques for Navigation Receivers and Applications) project aims to join deeply integrated GNSS/INS receiver architectures and LIDAR techniques to provide an advanced navigation solution. The approach is suitable for a wide range of surveying applications in difficult environments, being Urban Mapping selected as reference case. This paper presents the integrated GNSS+INS+LiDAR...
Self-encoded spread spectrum (SESS) has been shown to provide significant advantages for communications in fading or jamming environments. With the proliferation of GNSS such as GPS, Galileo, and GLONASS, it would be desirable to bring the advantages of SESS to these systems. In order to do this the iterative detector in a receiver must be able to provide a high-quality timing estimate. Presented...
This paper surveys Global Navigation Satellite System (GNSS) tropospheric modeling techniques currently employed in Space Based Augmentation Systems (SBAS), Ground Based Augmentation Systems (GBAS), and in precise point positioning applications. A method for generating GBAS tropospheric corrections without the use of meteorological sensors is discussed using seasonal models like those used in SBAS...
This paper introduces an algorithm to determine relative position between rover GNSS receivers. Other than the simple way of subtracting two coordinates, the proposed method is based on the code-phase differences. Pseudorange measurement differences are calculated directly, and the position difference can be derived as a solution to the linearized equation of pseudorange measurement. Principles and...
The paper presents an application of a software package for gathering in MS SQL database the high-throughput satellite navigation data, which is integrated with 3D visualization module GPS3D Viewer, developed by us as a part of Pan-European distributed system working under EGNOS Data Collection Network (EDCN). The software package is also integrated with PEGASUS, a program authorized by EUROCONTROL...
MStar Semiconductor (Taiwan) completed design & engineering of a combined GPS/GLONASS receiver for consumer market. The purpose of this paper is to inform the GNSS community about this development; in particular, about specific features and architecture of the receiver. First results of preliminary GPS/GLONASS receiver drive tests in a land vehicle under restricted satellite visibility conditions...
Differential Global Navigation Satellite Systems (DGNSS) are a commonly applied technique for safety critical (Safety-of-Life) navigational operations. Since the nineties an augmentation system following the IALA Beacon DGNSS standard has been employed in the maritime sector. As main components the system comprises a reference station and an integrity monitoring station. With the help of the reference...
This paper presents the key elements of the next generation of miniaturised GNSS space receivers compatible with the new and improved GNSS signals from Galileo and modernized GPS. A quick review of applications like Precise Orbit Determination (POD) and Radio Occultation (RO) is provided together with the performance achieved in current satellites like MetOp and GOCE and that expected in future ESA...
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