The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper studies regulated output synchronization for heterogeneous directed networks with non-introspective agents (i.e. agents have no access to their own states or outputs) in the presence of disturbance and measurement noises with known frequencies. A purely decentralized time-invariant protocol based on a low-and-high gain method is designed for each agent to achieve regulated output synchronization,...
This paper promotes a better understanding of the power grid quality and dynamics through the introduction of a newly developed Universal Grid Analyzer (UGA). The UGA is a real-time, highly accurate, and GPS synchronized power grid monitoring device used at distribution level. They can function as a power quality analyzer by performing harmonics measurement along with voltage sag and swell detection...
The paper deals with a systematic observer design for a robust frequency identification of electromechanical systems. The observer estimates the frequency response of the system which is excited by a swept harmonic signal with a variable frequency, amplitude and DC component. The paper presents a computationally efficient algorithm based on the recursive discretization of a Kalman filter. An application...
We study the statistical characteristics of radio environment noise, in particular focusing on spurious received power arising from adjacent channel interference, harmonics and wideband man-made interference. Unlike the majority of existing studies, our measurements enable a comprehensive study on frequencies ranging from 80MHz to 2.64 GHz instead of being focused on the properties of an application-specific...
A 14b 750MS/s 21.1mW current steering digital-to-analog converter (DAC) is presented, which maintains <-168dBm/Hz noise spectral density beyond the Nyquist frequency to minimize TX leakage in SAW-less FDD LTE. A hybrid wideband R-2R LSB segmentation with an impedance attenuator minimizes glitch noise across process and temperature without requiring accurate scaling of switches and switch drivers...
Design and construction of a fast and accurate low-frequency impedance analyzer is presented. Main application of the device is in semi-active noise and vibration damping with piezoceramic actuators in the frequency range from 50 Hz to 5 kHz. Constructed device presented here is based on an ARM microcontroller as a control and communication unit and analog part for synchronous voltage and current...
This paper presents the frontend part of the readout interface for a capacitive MEMS microphone designed and fabricated in 0.35 μm CMOS technology. The developed readout interface will be used in a noise dosimeter applicable in very noisy and harsh environment. The prototype chips were measured and the main parameters evaluated. The achieved results demonstrate low harmonic distortion, low noise and...
The paper presents a method for estimating the shaft position of a synchronous motor with permanent magnets (PMSM) for the zero and very low speed range. The method is based on the analysis of the high frequency currents, which are induced by the additional test voltage in a stationary coordinate system associated with the stator. Although this method involves the identification of currents hodograph,...
The recent surge of implantable and wearable medical devices have paved the way for realizing intra-body networks (IBNs). Traditional RF-based techniques fall short in wirelessly connecting such devices owing to absorption within body tissues. A different approach is known as galvanic coupling, which employs weak electrical current within naturally conducting tissues to enable intra-body communication...
High Frequency (HF) communications are of vital importance for modern military operations. It has the potential to move voice and data communications around the world by bouncing signals off the ionosphere, and at a fraction of the cost of heavily burdened satellite communication frequencies. However, HF-channels are touchy, unpredictable and prone to noise, fading, jamming and interference. Therefore,...
Machine fault diagnosis collects massive amounts of vibration data about complex mechanical systems. Analyses of the information contained in these data sets have already led to a major challenge. Compressed sensing (CS) theory is a new sampling framework that provides an alternative to the well-known Shannon sampling theory. This theory enables the recovery of sparse or compressible signals from...
Partial discharge (PD) measurements are commonly used in the maintenance of high-voltage equipment. New research is being done devoted to the measurement of the phenomenon in radiofrequency (RF) because it has several advantages compared to other classical methods. However, noise rejection is still one of the main challenges to face. In this paper, a method based on the power spectral share in bands...
In this paper, a bended differential transmission line using the L-shaped pad is proposed to suppress the differential-mode noise. The bended differential transmission line using the L-shaped pad can reduce the differential-to-common mode conversion from −6.58 dB to −10.10 dB and the TDR differential-mode noise from 0.087 V to 0.023 V as compared with the bended differential transmission line using...
In-line holography enables particle measurements in large imaging volumes with an extended depth of field compared with conventional imaging systems. Accurate measurements of the structural details of the particles are practically possible only if the measured details are brought in focus. In order to extract in-focus images of objects recorded into a digital hologram from a large set of holograms...
The paper describes algorithms of the nonparametric power estimation by summation of the products of the amplitude discrete Fourier transform (DFT) coefficients when simultaneously of sampling is assumed. As with energy-based approach for the amplitude square estimation of the one-channel signal, the apparent power in the two-channel case can be estimated with the multiplied amplitude DFT coefficients...
For any orbiting satellite mission, reliable communication link between satellite and ground receiving and transmitting station is very crucial as this is the only way satellite communicates with its operator. The key component within a ground receiving & transmitting station that enables this communication link is the antenna system. To ensure reliable communication, measurement of the antenna...
This paper proposes an evaluation method of human stress and drowsiness using photoplethysmography (PPG) measured from ears through the use of earbud-type photoplethysmographic sensor. For improving robustness with respect to body motion, velocity pulse waves have been calculated to detect motion artifact. In addition, to increase the temporal resolution and cope with misalignments in sensor position,...
There is a rising concern about the environmental status of the seas of our planet. Such concern regards several kinds of anthropogenic activities and their impact on the marine ecosystems. Part of the adverse effects are recognised to be due to various forms of acoustic emissions generated by human activities related to the exploitation of sea resources and to shipping. The main regulatory bodies...
The European AQUO project started in October 2012, in the scope of the FP7 European Research Framework, for three years duration. The final goal is to provide policy makers with practical guidelines and solutions, in order to mitigate underwater noise footprint due to noise radiation from ships. For a maritime area under consideration, mitigation solutions can be split into two categories: the first...
It is shown how noisy closed-loop frequency response measurements may be used to obtain pointwise in frequency bounds on the possible difference between an unknown closed-loop system and a nominal model of the closed-loop. To this end, the ν-gap metric framework for robustness analysis plays a central role.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.