Antonio Moschitta, Antonella Comuniello, Alessio De Angelis, F. Santoni, Paolo Carbone
In this paper, simultaneous amplitude measurement of multiple Chirp Spread Spectrum (CSS) signals is discussed. CSS signals are assumed to be generated by digital devices whose clocks are not fully synchronized. The effects of incomplete synchronization and noise at the receiver side are investigated and discussed, assuming that the signals amplitudes are estimated using correlation techniques.
Gu Yi
During the measurement of transmission delay time in Automatic Test System, influenced by the boundary condition, the echo was partially lost, which directly affected the measurement result. By using differential positioning algorithm and implementing a supplementary measurement, the lost echo signal can be recovered,and the result of transmission delay time measurement can be accurately given. Through experiments, this paper proved that the differential positioning algorithm is feasible, and the results are accurate.
Sioma Baltianski
The paper presents the previously unreported properties of current-carrying conductors in the low frequency region utilizing impedance spectroscopy. The studied objects have an additional low frequency impedance during the passage of an electric current. The bias-induced impedance (ZBI) is noticeably manifested in the range of 0.01 - 100 Hz and has either capacitive or inductive nature or both types, depending on the bias level (current density) and material types. The experiments in this work were done using wires made of pure metals, alloys, and non-metal conductors, such as graphite rods....
Ding Chao
Interferometer spectrometer can change the optical path difference of lensby the constant motion of moving mirror, and optical path difference is used for qualitative and quantitative analysis of the function, so keeping uniform velocity and stability in the motion of the moving mirror has a great influence on accuracy and resolution of the spectrometer. In this paper, magnetic levitation device is used as the supporting system of the moving mirror, the motor of the voice coil is the driving system of the moving mirror and we studied the coupling between the two systems of controling the...
Luca De Vito, Francesco Picariello, Sergio Rapuano, Ioan Tudosa
This paper investigates the application of Compressive Sampling (CS) for the realization of a Vector Signal Analyzer (VSA) node for distributed spectrum monitoring. Herein, the non-uniform sampling approach is proposed for the signal acquisition section of the node, under the assumption of sparsity of the acquired signal in the frequency domain. A simulation analysis has been conducted to assess several figures of merit, characterizing the performance in the frequency and modulation domains. The obtained results demonstrate that the CS could reduce the amount of acquired samples by a factor...
Valentyn Isaiev, Oleh Velychko
The paper presents a method for checking the accuracy of the commercial AC comparators used to calibrate current transformers. This method is simple and convenient and requires no special means of minimizing measurement uncertainty. Only conventional measuring instruments are used making this method cheaper for large amounts of laboratories. The analysis of the currents interrelation of a calibrated transformer and working standard allowed us to derive mathematical models of errors. The obtained models of the ratio error and phase displacement allow simulating different ratios of secondary...
Marjan Urekar, Platon Sovilj, Ivan Gutai, Dragan Pejic, Bojan Vujicic, Djordje Novakovic
The low-power stochastic sensor is proposed, and its suitability for operation in Internet of Things and Industrial Internet of Things for Industry 4.0 environments is emphasized. Unlike typical digital sensors, instead of a digitizing module, this sensor has a digital stochastic measurement module that enables low-power yet fast and accurate measurements. Assessment model includes test signal generator, the standard calibrator and the sensor prototype. Multi-channel and large sensor network applications in Industry 4.0 are considered, as well as cost-effective upgrades of the existing...
Luca De Vito, Francesco Picariello, Ioan Tudosa
The paper proposes a novel measurement method for frequency response characterization of Digital-to-Analog Converters (DACs). The method uses a Compressive Sampling (CS) technique which exploits the sparsity of the DAC impulse response in the time domain. The mathematical formulation of the method and its preliminary simulation analyses are presented. The obtained results demonstrate that the proposed measurement method based on CS could benefit from a significant sampling rate reduction respect to the Nyquist one.
Karsten Leitis, Tommy Halim
This paper presents a novel scheme for conversion of analog to digital signals. Applying a native conversion resolution of just one bit with only one comparator the converter is able to increase the resolution as it can be the case with dual slope or ΔΣ converters. The new concept is based on a recursive operation. Therefore the converter is named rADC - recursive ADC. By processing ten recursive cycles a 10 Bit 1 MSa/s test result has been achieved by simulation of a 180 nm CMOS test circuit. The rADC components of the CMOS test circuit are a comparator, a S/H circuit, some gates,...
Valentyn Isaiev, Oleh Velychko
The research work was aimed at improvement of metrological service of Ukraine, i.e., to solve a problem of metrological support of the production and operation of the thermoelectric converters, precision meters and sources of alternating current. A method of comparing alternating current with equivalent direct current using the precision thermal converter and shunts was selected to build the standard, and the composition of the standard was established. A functional diagram of the standard was developed to disseminate an alternating current unit. The main sources of measurement uncertainty...