Radiation Emission EMC Measurement in Real-Time.
ABSTRACT Notice of Violation of IEEE Publication Principles"Radiation Emission EMC Measurement in Real-Time"by F.G. Awan, N.M. Sheikh, M. Fawadin the Proceedings of the Information Technology: Sixth International Conference on New Generations, ITNG '09, pp.528-533, April 2009After careful and considered review of the content and authorship of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE's Publication Principles.This paper contains significant portions of original text from the paper cited below. The original text was copied without attribution (including appropriate references to the original author(s) and/or paper title) and without permission.Due to the nature of this violation, reasonable effort should be made to remove all past references to this paper, and future references should be made to the following article:"Taking Time-Domain EMI Measurements According to International EMC Standards,"by S. Braun and P. Russer in Compliance Engineering Journal, vol. 23, no. 1, pp. 45ߝ54, March 2006.For electromagnetic compatibility, radiation emission measurements are to date carried out in frequency domain in accordance with applicable emission measurement CISPR and ANSI standards, using a conventional heterodyne receiver. This paper discusses and summarizes the theory, setup, and algorithms in time domain, as well as the practical aspects of pre and full compliance radiation emission measurement system in real time resulting in comparison, a good many orders faster measurements using several sub-bands processing units for the frequency range up to 1 GHz. By making use of the deterministic and stochastic processes and fast Fourier transform based time frequency analysis, the digital signal processing is used for the statistical spectral estimation and detection, that provides same degree of accuracy and signal to noise ratio by the parallel emulation- of all required detector modes and auxiliary outputs, and better dynamic range with lower noise floor than with conventional EMC receivers and spectrum analyzers. This will considerably reduce the compliance test and development costs of electrical devices.
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ABSTRACT: A low-cost electromagnetic compatibility precompliance test-set is essential to reduce the development costs of any electrical device. In this paper we discuss the advantages of broadband time-domain preliminary compliance measurement techniques applied to all types of electromagnetic interferences. The digital signal processing of electromagnetic interference measurements allows emulating in real-time the various modes of conventional analogous equipment, e.g., peak, average, root mean square, and quasi-peak detector mode. Since time-domain techniques allow processing the whole amplitude spectrum in parallel, the measurement time may be reduced by at least one order of magnitude. Compliance measurement results for conducted and radiated emissions obtained with the time-domain electromagnetic interference (TDEMI) system are shown. The TDEMI system has a real-time bandwidth of 1.5 GHz. Measurement techniques for nonstationary signals and single events are discussed.IEEE Transactions on Instrumentation and Measurement 11/2004; · 1.71 Impact Factor
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ABSTRACT: In the past and now measurements are carried out by EMI-receivers operating in frequency-domain. By a time-domain EMI (TDEMI) measurement system the measurement time can be reduced by several orders of magnitude. In this paper a novel real-time TDEMI measurement system that uses a direct hardware implementation of the short time fast Fourier transform (STFFT) and the detector modes is described. The hardware implementation on field programmable gate arrays (FPGAs) allows to process the input signal in realtime. By the continuous processing via the STFFT the IF-signal for selectable frequency can be provided as requested by CISPR 16-1-1. By simulations on a proposed FPGA it is shown that the measurement time can be reduced by a factor of about 2000 in comparison to conventional EMI receivers. The dynamic range of a fixed point FFT has been investigated and it has been shown that a 16-bit fixed point arithmetic is sufficient to fulfill the requirements according to the international EMC standards. EMI signals have been recorded and processed by a hardware model. The results have been compared with measurements obtained with a conventional EMI receiver in the frequency range 30 MHz - 1 GHzElectromagnetic Compatibility, 2006. EMC-Zurich 2006. 17th International Zurich Symposium on; 01/2006
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ABSTRACT: A broad discussion is presented of spectral estimation techniques and their implementation. The topics addressed include: reviews of linear systems, transform theory, matrix algebra, and random process theory; classical spectral estimation; parametric models of random processes; autoregressive process and spectrum properties; block data algorithms and sequential data algorithms in autoregressive spectral estimation. Also discussed are: autoregressive-moving average spectral estimation; Prony's method; minimum variance spectral estimation; eigenanalysis-based frequency estimation; summary of spectral estimators; multichannel spectral estimation; and two-dimensional spectral estimation.The Journal of the Acoustical Society of America 11/1989; 86(5):2043-. · 1.56 Impact Factor