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This paper describes recent developments at JIVE and the European VLBI Network (EVN), aimed at fostering the seamless interaction of VLBI networks around the globe, and eventually the inclusion of the SKA and its precursors as VLBI elements.
This paper presents ionospheric scintillation data recorded at SANAE in Antarctica during a moderate geomagnetic storm on 20–21 January 2016 which gives evidence of the advantages of the new generation of instrumentation for monitoring ionospheric scintillation. The data was collected as part of the DemoGRAPE project aimed at the demonstration of cutting edge technology for the empirical assessment...
Due to the partition/aggregate nature of many distributed cloud-based applications, incast traffic carried by TCP abounds in data center networks. TCP, being agnostic to such applications' traffic patterns and their delay-sensitivity, cannot cope with the resulting congestion events, leading to severe performance degradation. The co-existence of such incast traffic with other throughput-demanding...
The aim of this paper is to propose a complementary Health Management module to monitor the GPS accuracy for autonomous vehicles. Based on sensor information, the error causes of GPS can be observed in some specific contexts (urban, climate…). The proposed module relies on a Bayesian Network model that allows to reinforce the belief of GPS failure based on evidence. A hardware/software implementation...
This paper addresses the design and implementation of an Ionospheric Scintillation Monitoring Receiver based on the Software Defined Radio paradigm. The monitoring platform exploits a digital data grabber and a GNSS fully software receiver, which grants a high level of flexibility for the processing strategy and the storage of raw samples of the signals in case of meaningful scintillation events....
The receiver system is an important part of FAST (Five-hundred-meter Aperture Spherical Radio Telescope) and plays a key role in determining the performance of the telescope. The receiver design requires synchronization among the digital instruments and accurate timestamp, because time synchronization of astronomical data before and after it is recorded and processed is of vital importance for the...
Ionospheric propagation is harmful for the electromagnetic signals broadcast by Global Navigation Satellite System (GNSS) satellites, mainly because of the presence of electron density anomalies. GNSS receivers are indeed of primary importance in scintillation and Total Electron Content (TEC) monitoring, especially at low and high latitudes, where scintillations are more frequent. Professional dual...
In 2013–2014, a new software and hardware controlling complex was developed and installed on the UTR-2 radio telescope. Controlling complex is designed for planning observations of discrete cosmic radio sources and areas of the celestial sphere, for programming control of UTR-2 pattern position with UTC time scale synchronization, for monitoring of control codes execution, as well as for control of...
Information is the most critical asset of modern organizations, and accordingly coveted by adversaries. When highly sensitive data is involved, an organization may resort to air-gap isolation, in which there is no networking connection between the inner network and the external world. While infiltrating an air-gapped network has been proven feasible in recent years (e.g., Stuxnet), data exfiltration...
This paper describes a system for helping teen drivers track there experience while training to obtain their driver's license. The proposed system is a portable in-vehicle device run by an embedded microcontroller that logs student driver hours and mileage and a PC program to create reports from the recorded data. The proposed device uses a GPS receiver to track distance traveled and time spent driving.
Multi-band, multi-service and multi-modulation are new trends of GNSS development. Since novel modulation types like BOC/MBOC and multiplex techniques like (POCET, Interplex) of navigation signals have been utilized [1], the composite navigation performance is indeed improved. However, new challenges have arisen in the navigation signal quality monitoring area. Generally, common standard instruments,...
A Mobile Ad hoc Network (MANET) is attracting attention as a useful means of communication in times when the communications network infrastructure has been disrupted by a widespread disaster. It would be convenient if a SIP application that the user is already familiar with and that is installed in his/her mobile terminal could be transformed into a node in a MANET automatically. So far, SIP services...
In this study, it will attempt to verify the performance and SITMS service in seamless communication environments that offers vehicle to vehicle, vehicle to infrastructure (V2X). We select indications for the basic test; average throughput, packet loss rate, coverage, response time, link access time. This paper presents test method and performance results of the SMART Highway communication, IEEE 802...
GPS technique is widely adopted in many fields, it is particularly important to receive and handle GPS data rapidly and accurately using computer. In this paper, the GPS is introduced firstly; then the data format and the information components of GPS message are analyzed; finally, source codes in VB 6.0 language to process GPS data are given.
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...
Today's Global Navigation Satellite System (GNSS) receivers predominantly utilize hardware based digital signal processing. This approach generally provides high performance and low power consumption GNSS receivers but on the other hand limits the flexibility as the receiver functionality is fixed. The aim of this paper is to present an overview on the ipexSR real-time GNSS software receiver developed...
The paper deals with the real-time monitoring of the European Geostationary Navigation Overlay Service (EGNOS). Possible approaches to the monitoring are discussed at first. The rest of the paper presents the development of C++ software for real-time monitoring of EGNOS performance in the position domain. The software is intended to be used within the GNSS monitoring station run by the Department...
This paper presents a software-based instrument for testing and monitoring the behavior of complex communications systems that employ a number of interconnected DSPs. The instrument is based on a dynamic architecture that incorporates a set of distributed software probes for signal capturing and a central data acquisition unit for acquiring and post-processing of data. A high level application that...
This paper describes a health status protocol for distributed real-time systems that use TTCAN, Flexray, or other networks which support both time-triggered and event-triggered communication. The protocol allows a group of co-operating processes to establish a consistent view of each other??s health status over time. It extends the instantaneous view, of operational status of each process, provided...
This paper describes a methodology for building a reliable internet core router that considers the vulnerability of its electronic components to single event upset (SEU). It begins with a set of meaningful system level metrics that can be related to product reliability requirements. A specification is then defined that can be effectively used during the system architecture, silicon and software design...
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