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The Low-level Radio Frequency (LLRF) control system for linear accelerator at Legnaro National Laboratories (LNL) of INFN is being upgraded by a new digital Radio Frequency (RF) controller. This controller is critical to keep phase, amplitude and frequency stability of the RF field in Quarter Wave Resonator (QWR) cavities of the linear accelerator. These cavities work in superconducting condition...
SPES is a second generation ISOL radioactive ion beam facility in construction at the INFN National Laboratories of Legnaro (LNL). Its distributed control system embeds custom control in almost all instruments or cluster of homogeneous devices. Nevertheless, standardization is an important issue that concerns modularity and long term maintainability for a facility that has a life span of at least...
The paper presents an experimental analysis of some link layer characteristics of GPRS (General Packet Radio Service) mobile networks and discusses their relationship to TCP/IP performances. Mobile networks implement sophisticated mechanisms in order to provide mobility and capacity in a wide area. Unfortunately, large delays along the radio path may be introduced, thus reducing throughput in data...
In the last few years wireless sensor networks (WSNs) have gained an increasing interest in the scientific community, due to their wide variety of applications and technical issues to be faced. Many challenges and design issues arise in this ad hoc scenario. In this chapter, some concepts are discussed having in mind a twofold point of view: the telecommunication researcher or GRID designer perspective,...
Recent improvements in microelectrodes technology have enabled neuroscientists to record electrophysiological signals from hundreds of neurons and simultaneously from a large number of channels. However, several environmental factors may introduce noise and artefacts and affect proper interpretation of recordings. Thus, the development of appropriate signal acquisition and processing platforms dealing...
Measurement in power systems and, particularly, in smart grids and smart microgrids is often concerned with harmonic analysis of voltage and current waveforms, which can be obtained by Fourier-based algorithms (e.g., phasor measurements, power quality analysis). Any such measurement algorithm is characterized by a fundamental time-frequency resolution tradeoff that relates the sampling frequency and...
Sensor networks need a common timescale to be shared among their constituent elements. Accuracy and reliability are key issues in time dissemination, the latter aspect being specifically addressed in several synchronization schemes. In the paper, we present an approach to reliability assessment based on monitoring the innovation of the Kalman filter employed as the local clock servo in a sensor node...
Instrumentation supporting the development of cognitive radio systems is faced with challenging requirements. The ability to determine the mutual coordination and timing of primary and secondary sources and generally support troubleshooting requires significant enhancements to the capabilities of a vector signal analyzer. In this context, we introduce and discuss the performances of a modulation detector...
In the framework of the EURISOL [1] program to define a second generation RIB (Radioactive Ion Beam) facility, LNL-INFN is constructing in the next five years a specialized national facility for exotic beams based on ISOL method with a uranium compound target, named SPES (Selective Production of Exotic Species) [2]. The RIBs are produced inside the target chamber complex. For radioprotection issues,...
Smart microgrids exploit information and communication technologies to efficiently manage local renewable energy sources and energy storage devices, collectively known as distributed energy resources (DERs). This requires the inclusion of rather sophisticated sensing and/or actuating units within the DER interfaces.
A low-cost comb generator based on a PLL scheme is presented in the paper. It can be used to characterize test sites where a wide band analysis (in the range 600MHz – 12GHz) with a compact and portable device may quickly provide the required results. The good spectral purity, the tunable generated frequency and the long-term stability characteristics of the proposed generator make it useful also for...
The measurement of far field disturbance radiated by printed circuit boards (PCBs) is here dealt with. In particular an efficient measurement system is proposed by means of which electronic designers can assess the effectiveness of a given electromagnetic compatibility (EMC) solution to be applied to a PCB in order to reduce the radiated disturbance in the 2-8 GHz band. The effectiveness of the system...
In this paper we propose a method based on multimodal histograms for analyzing digitally modulated signals. This method does not require any a-priori knowledge on modulation parameters. This makes it particularly interesting in applications where information about the modulated signal are missing or known only approximately, and the capability to analyze a digitally modulated signal with partial knowledge...
An experimental study of a modern ultra high frequency (UHF) radio frequency identification (RFID) system is here proposed. Some relationships between the electromagnetic field levels received by the deployed devices and the system overall performance are in particular analyzed. The main purpose is to experimentally analyze the behavior and performance of a real world UHF RFID system underlying the...
Radio frequency identification (RFID) is a modern wireless communication technology used for identification purposes. By now, experimental results showing the actual performances reachable by a UHF RFID system, are still missing, together with the problems that can be encountered in practice and the corresponding solutions. In this paper, the performance of an UHF RFID system in real-world conditions...
In this paper, the WirelessHART communication scheme is investigated. The protocol is at first described, in order to underline the key aspects of its design; then, a simulation tool is presented: it enables analysis that accounts for both protocol and physical layers issues. In particular, interference effects on protocol choices can be easily analyzed. The experimental results, obtained from simulations,...
This paper examine the efficiency of energy use of three conservation tillage practices (SST – sub-soil tillage; MT – minimum tillage; and NT – no tillage) performed within two management zones, previously identified in a field according to the stability of yield variability. Experiments were carried out in 2003 in NE Italy, on a farm near Rovigo, on a 8-ha field with clay soil, in maize (Zea mays,...
In the modern wireless applications of factory automation, interference phenomena among near operating wireless networks can be the cause of severe performance degradation. To avoid this possibility and prevent deleterious system failures, simulations may offer a real and reliable solution. In this paper a new simulator is presented, allowing cross-layer analysis of interference phenomena arising...
The deployment of a wireless control system must cope with a number of effects usually negligible in a wired scenario. To this aim, an experimental analysis on suitable prototypes and testbeds can readably offer a valid and rapid method to forecast the behavior of a real network. In this paper, performance measurement of industrial wireless sensor network in the presence of various type of interference...
The effects of interference on IEEE 802.15.4 devices performance are here dealt with, with special regard to the role played by the signal strength indication (RSSI) meter embedded in each device. In particular, attention is paid to some typical RSSI meter impairments, and on their effect on the device susceptibility to external interference. To the purpose, measurements are conducted on a purposely...
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