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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. ATENEA tackles the most challenging issues of...
Services based on Global Navigation Satellite Systems (GNSS) are currently in use in many critical networked infrastructures and crucial applications. Within the described scenario, the importance for the GNSS community of investigating the effects of spoofing attacks, together with anti-spoofing techniques, appears essential. This paper describes the results of preliminary tests performed in lab...
This paper contains selected test results of an indoor positioning prototype system making use of GPS/Galileo signals on L1/E1 and L5/E5a in addition to WiFi data, ZigBee data and a MEMS-based dead reckoning algorithm called pedestrian navigation system (PNS). The system uses a partially coherent ultra-tightly coupled integration scheme. The GNSS signal processing (acquisition and tracking) supports...
The provision of robust position, navigation and timing (PNT) information is a fundamental element of the e-Navigation initiative proposed by the International Maritime Organization (IMO). In this context the single Electronic Position Fixing System (EPFS), which currently conforms to the minimum carriage requirement, should be replaced by an integrated PNT unit as future onboard integrated system...
Taking benefit of the new Galileo ranging signals, the ENCORE (Enhanced Code Galileo Receiver) project aims to develop a low-cost Land Management Application to cover needs of the Brazilian market in terms of geo-referencing and rural/urban cadastre, using a low-cost Enhanced Galileo Code Receiver as baseline. Land management applications require precision and accuracy levels from a few to several...
With the multiplication of navigation systems (GPS, GALILEO, GLONASS, QZSS, ...) and the large variety of signals to be received, GNSS constellation simulators need to be more and more flexible. In the scope of its navigation activities, the CNES has expressed the need for a simulator that, in addition to allow the test of a large variety of receivers, satisfies a twofold objective: the emulation...
A satellite formation flying mission consists in a set of satellites flying in close configuration whose geometry is accurately measured and controlled. Ultimately this allows making space science using a so called “distributed instrument” on several spacecrafts. Several science missions are envisioned, for example PROBA-3 or Darwin from ESA. These missions require very accurate relative positioning...
The implementation of BOC ambiguity resolution has been tested and provides low false lock probability in realistic conditions. Possible improvements and robustification are proposed for future implementation.
Blockage of the line-of-sight (LOS) component is one of the main problems of GNSS receivers when operating in harsh working conditions. This is the case, for instance, of urban canyons, where GNSS receivers in moving vehicles are subject to sudden fading events with more than 20 dB of signal attenuation. In these circumstances it is not possible for traditional receivers to keep track of the received...
In this paper an algorithm suitable to interference detection for terminal embedding commercial GNSS chipsets is presented. The algorithm monitors the value of the C/N0 estimated by the receiver for multiple channels and a detection rule is set in order to obtain the desired performance in terms of false alarm and detection probabilities.
RDSS downlink bands, usually with a paired uplink, could be used, like RNSS bands, for satellite navigation. The eventual need for additional Galileo frequencies and signals in S-band or C-band in addition to those currently used is not only about improving the pseudoranging or timing performance, but primarily about introducing new services. Another very important field recently studied to improve...
With the advent of new Global Navigation Satellite Systems (GNSS) and signals, Satellite Based Augmentation Systems (SBAS) will rely also on them to provide higher position accuracy. For services based on such systems it is fundamental to protect the user against potential signal distortions in order to ensure the required integrity and performance. SBAS systems usually implement signal deformation...
For safety of life applications of satellite navigation systems, in e.g. aviation, reliability in the sense of accuracy, availability, continuity and integrity is essential. In order to test the performance with regard to these characteristics a test methodology is required. This methodology should meet the requirement to be able to perform the analysis based on a limited amount of data collected...
ROSA is a dual-frequency GPS receiver developed for space applications and tailored for GPS radio occultation studies. It is developed and manufactured by Thales Alenia Space Italia under a contract with the Italian Space Agency (ASI) and is designed to establish accurate global profiles of temperature and water vapour in the lower atmosphere. Moreover, ROSA antenna extended coverage allows the retrieval...
This article presents results of tests on real signal of a method of positioning using a digital TV DVB-T signal-of-opportunity which is based on an OFDM modulation. OFDM and DVB-T standard are presented and the positioning method using the DVB-T signal is detailed. The result on real signal are analyzed qualitatively and quantitatively in static and dynamic scenarios and indoor and outdoor environments...
Array processing is a very promising technology for mitigation and detection of radio interference in receivers of satellite navigation systems. This paper presents early results of a multi-antenna receiver measurement campaign in Berchtesgaden GATE.
This paper focuses the attention on the problem of Radio Frequency Interference (RFI) mitigation in the framework of GNSS. The paper concentrates on interference mitigation algorithms to be applied within the digital part of a GNSS receiver. The first part of the paper focuses on the mitigation of RFI based on Wavelets. The theoretical fundamentals of the approach are presented, introducing the continuous...
The paper proposes a low-complexity implementation of the Vector Delay Lock Loop (VDLL) suitable for low-cost receivers operating with several GNSS constellations in indoor and urban scenarios. The tracking algorithm is based on the propagation of the estimated space/time trajectory through a grid of cells in two steps: prediction and updating. Side information about the receiver's motion and/or environment...
This paper details the research and development of a robust, real-time GPS attitude determination system that has now been demonstrated using the SGR-20 GPS receiver on the Topsat microsatellite. As part of this work a robust integer ambiguity resolution algorithm was developed and validated using data logged in orbit. The new algorithms were integrated into the flight determination software on the...
The MBOC Galileo Reference Receiver is a newly designed prototype for GNSSs SIS demodulation on E5, E6 and L1 bands. The receiver, with more than one-hundred channels, is developed in a modular and reconfigurable fashion and is targeted to upgraded Ground Reference Stations. New features include specific processing of MBOC modulations and a novel proprietary technique for Giove PRS tracking. The receiver...
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