Time-domain Multitone Impedance Measurement System for Space Applications

Pous, Marc; Azpúrua, Marco A.; Zhao, Dongsheng; Wolf, Johannes; Silva, Ferran

doi:10.1109/emceurope51680.2022.9901170

Cited by 2 publications

(3 citation statements)

References 14 publications

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“…Likewise, reducing dynamic range compression effects by lowering the multitone signal crest factor is desirable. This is possible by appropriately selecting the relative phases of the individual tones, according to the criterion in [23].…”

Section: B Reference Signalsmentioning

confidence: 99%

Evaluation of Spectral Estimation Parameters for Direct Sampling FFT-Based Measuring Receivers

García-Bermúdez,

Solé-Lloveras,

Hudlička

et al. 2024

IEEE Open J. Signal Process.

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The standard CISPR 16-1-1 defines the measuring receiver using a black-box approach and sets requirements for its accuracy and spectral properties. Traditionally, such test receivers were developed using a superheterodyne architecture. Recently, time-domain electromagnetic emission measurement systems have been built employing direct sampling instruments, mainly oscilloscopes, and relying on specific signal processing to emulate the performance of compliant instruments. In these cases, the short-time Fourier transform is used for spectral estimation, but the corresponding electromagnetic compatibility standards lack details for its correct use with respect to parameters such as windowing function, overlapping factor, and frequency interpolation. Moreover, it is unclear which combination of spectral estimation parameters is best fit for this purpose. Obtaining reliable, consistent and low uncertainty spectral estimates of electromagnetic emissions measured in time-domain needs appropriate configuration and tuning of the signal processing algorithms. This paper investigates the error in the calculated spectrum for various reference signals: multitone, chirp pulses and rectangular pulses. The analysis is carried out for each CISPR band from A to D, that is, between 9 kHz and 1 GHz. After 489.6 × 10 3 iterations, distributed in 1700 different digital implementations of the CISPR 16-1-1 measuring receiver, the simulations outcomes point to certain sets of parameters that showed satisfactory performance overall, being the Nutall, Kaiser, and Parzen windows with more than 75% of overlapping and using interpolation factor higher than 5, generally suitable. Calibration results are used to experimentally verify that a valid set of parameters is adequate to fulfil CISPR 16-1-1 requirements.INDEX TERMS CISPR-16-1-1, electromagnetic compatibility, measuring receiver, short-time Fourier Transform, standards, time-domain measurements.

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Section: B Reference Signalsmentioning

confidence: 99%

Evaluation of Spectral Estimation Parameters for Direct Sampling FFT-Based Measuring Receivers

García-Bermúdez,

Solé-Lloveras,

Hudlička

et al. 2024

IEEE Open J. Signal Process.

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“…The multitone has the advantage of using a low crest factor when the phases of the tones are properly selected. If an AWG generates full periods of the signal, no leakage is produced, and a very high dynamic range can be achieved [5]. A single instrument for the complete verification.…”

Section: Proposed Improvements a Improvements Descriptionmentioning

confidence: 99%

“…2) CE verification: Regarding the CE verification, we employ the AWG available at an R&S RTO6 oscilloscope to generate the multitone excitation. As detailed in past studies, reducing the crest factor of the excitation signal is crucial to obtain a high dynamic range [5], [12]. Hence, the Schroeder [13] approach has been applied to compute the tone phases to minimize the crest factor.…”

Section: B Validation Measurements Of the Proposed Improvementsmentioning

confidence: 99%

Conducted Emissions Verification Setup Improvement for Space Applications

Pous,

Azpúrua,

Zhao

et al. 2023

2023 International Symposium on Electromagnetic Compatibility – EMC Europe

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Just-before-test verification is needed to ensure that electromagnetic interference measurements are correctly performed. Some standards cover such specific requirements regarding test verification, this is the case of the ECSS-E-ST-20-07c for space applications. However, some drawbacks in the standard procedure have been identified, and in this work, we provide advice for improving the conducted emissions verification. For instance, we argue that the complete frequency range of the test should be evaluated during the verification of the test equipment, not just two single frequencies. Likewise, it is demonstrated how the standard verification setup introduces a significant mismatch that can compromise the accuracy of the result. Moreover, this work highlights the capabilities of novel instrumentation like high-end oscilloscopes that effectively provide convenient alternatives to improve further and simplify the measurement methodology while achieving even more accurate results if applied correctly.

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Time-domain Multitone Impedance Measurement System for Space Applications

Cited by 2 publications

References 14 publications

Evaluation of Spectral Estimation Parameters for Direct Sampling FFT-Based Measuring Receivers

Evaluation of Spectral Estimation Parameters for Direct Sampling FFT-Based Measuring Receivers

Conducted Emissions Verification Setup Improvement for Space Applications

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