Ponències/Comunicacions de congressos
http://hdl.handle.net/2117/1116
2024-03-28T20:36:06Z
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Analysis of the effect of deviated modulating signal characteristics on the susceptibility of a small medical device
http://hdl.handle.net/2117/404808
Analysis of the effect of deviated modulating signal characteristics on the susceptibility of a small medical device
Bastian, Geon George; Pinto Nunes, Tiago; Quílez Figuerola, Marcos; Fernández Chimeno, Mireya; Silva Martínez, Fernando
A variety of modulation techniques using various signal characteristics are used by the telecommunication industry in real-life applications. Despite this, the radiated immunity test based on the IEC 61000-4-3 only modulates in amplitude the carrier signal using a 1 kHz sine wave at 80% depth. In this study, we performed the radiated immunity test on a miniaturized device with biomedical applications using deviated signal-modulating characteristics than those mentioned in the IEC 61000-4-3. The results show that it is important to carry out an adequate risk analysis of the equipment under test (EUT) considering its unique functional characteristics before resorting to just the modulating frequency mentioned in the standards.
2024-03-18T11:25:43Z
Bastian, Geon George
Pinto Nunes, Tiago
Quílez Figuerola, Marcos
Fernández Chimeno, Mireya
Silva Martínez, Fernando
A variety of modulation techniques using various signal characteristics are used by the telecommunication industry in real-life applications. Despite this, the radiated immunity test based on the IEC 61000-4-3 only modulates in amplitude the carrier signal using a 1 kHz sine wave at 80% depth. In this study, we performed the radiated immunity test on a miniaturized device with biomedical applications using deviated signal-modulating characteristics than those mentioned in the IEC 61000-4-3. The results show that it is important to carry out an adequate risk analysis of the equipment under test (EUT) considering its unique functional characteristics before resorting to just the modulating frequency mentioned in the standards.
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Description of the Rita payload aboard AlainSat-1, A 3U educational Cubesat
http://hdl.handle.net/2117/401945
Description of the Rita payload aboard AlainSat-1, A 3U educational Cubesat
Gonga Siles, Amadeu; Pérez Portero, Adrián; Fernandez Capon, Lara Pilar; Garcia Morilla, Alejandro; Gràcia i Solà, Guillem; Contreras Benito, Luis Juan; Ramos Castro, Juan José; Camps Carmona, Adriano José; Jallad, Abdul-Halim
The Remote sensing and Interference detector with radiome-Try and vegetation Analysis (RITA) payload was selected in 2019 the 2nd GRSS Student Grand Challenge to fly onboard AlainSat-1, a 3U CubeSat developed at the National Space Science and Technology Center (NSSTC) in United Arab Emirates. RITA payload includes a passive Microwave Radiometer (MWR), a LoRa transceiver, and an hyper-spectral camera. The objective of the payload is to retrieve Earth Observation (EO) parameters such as: soil moisture, sea-ice thickness and concentration, among others. A Radio Frequency Interference (RFI) detection algorithm is also included to the payload to create interference maps in the received signals.
2024-02-15T08:10:33Z
Gonga Siles, Amadeu
Pérez Portero, Adrián
Fernandez Capon, Lara Pilar
Garcia Morilla, Alejandro
Gràcia i Solà, Guillem
Contreras Benito, Luis Juan
Ramos Castro, Juan José
Camps Carmona, Adriano José
Jallad, Abdul-Halim
The Remote sensing and Interference detector with radiome-Try and vegetation Analysis (RITA) payload was selected in 2019 the 2nd GRSS Student Grand Challenge to fly onboard AlainSat-1, a 3U CubeSat developed at the National Space Science and Technology Center (NSSTC) in United Arab Emirates. RITA payload includes a passive Microwave Radiometer (MWR), a LoRa transceiver, and an hyper-spectral camera. The objective of the payload is to retrieve Earth Observation (EO) parameters such as: soil moisture, sea-ice thickness and concentration, among others. A Radio Frequency Interference (RFI) detection algorithm is also included to the payload to create interference maps in the received signals.
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Characterization and verification of the Rita payload hyperspectral imager in Alainsat-1, as part of the 2nd IEEE GRSS student grand challenge
http://hdl.handle.net/2117/401764
Characterization and verification of the Rita payload hyperspectral imager in Alainsat-1, as part of the 2nd IEEE GRSS student grand challenge
Contreras Benito, Luis Juan; Gonga i Siles, Amadeu; Crisan, Ieremia; Pérez Portero, Adrián; Garcia Morilla, Alejandro; Gràcia i Solà, Guillem; Ramos Castro, Juan José; Jallad, Abdul-Halim; Camps Carmona, Adriano José
The Remote sensing and Interference detector with radiome-Try and vegetation Analysis (RITA Payload) [1] is a development of the UPC NanoSat Lab, aimed at Earth Observation (EO). It is one of the winners of the Second IEEE GRSS Student Grand Challenge, and will fly on-board AlainSat-1, a 3U CubeSat developed by the National Space Science and Technology Center (NSSTC) of the United Arab Emirates.RITA hosts three experiments. An L-band microwave radiometer (MWR) will gather data of soil moisture and sea ice thickness and concentration, aided with a Radio-frequency Interference (RFI) detection algorithm. A LoRa transceiver will perform on-demand execution of the EO experiments [2]. Finally, a Near-Infrared (NIR) Hyperspectral Camera will gather data for vegetation monitoring, agriculture applications, hydrology and coastal and inland waters mapping, among others [3].This work is focused on the calibration and validation of the Hyperspectral imager, at optical, electronic and spectral levels, as well as in the verification of its performance to measure Normalized Difference Vegetation Index (NDVI).
2024-02-13T10:19:29Z
Contreras Benito, Luis Juan
Gonga i Siles, Amadeu
Crisan, Ieremia
Pérez Portero, Adrián
Garcia Morilla, Alejandro
Gràcia i Solà, Guillem
Ramos Castro, Juan José
Jallad, Abdul-Halim
Camps Carmona, Adriano José
The Remote sensing and Interference detector with radiome-Try and vegetation Analysis (RITA Payload) [1] is a development of the UPC NanoSat Lab, aimed at Earth Observation (EO). It is one of the winners of the Second IEEE GRSS Student Grand Challenge, and will fly on-board AlainSat-1, a 3U CubeSat developed by the National Space Science and Technology Center (NSSTC) of the United Arab Emirates.RITA hosts three experiments. An L-band microwave radiometer (MWR) will gather data of soil moisture and sea ice thickness and concentration, aided with a Radio-frequency Interference (RFI) detection algorithm. A LoRa transceiver will perform on-demand execution of the EO experiments [2]. Finally, a Near-Infrared (NIR) Hyperspectral Camera will gather data for vegetation monitoring, agriculture applications, hydrology and coastal and inland waters mapping, among others [3].This work is focused on the calibration and validation of the Hyperspectral imager, at optical, electronic and spectral levels, as well as in the verification of its performance to measure Normalized Difference Vegetation Index (NDVI).
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Overview of Alainsat-1 Mission: A remote sensing student nanosatellite
http://hdl.handle.net/2117/397351
Overview of Alainsat-1 Mission: A remote sensing student nanosatellite
Jallad, Abdul-Halim; Camps Carmona, Adriano José; Marpu, Prashanth; AlMazrouei, Mai; Ba Layth, Ahmed; Aleissaee, Shamma; Alsalmani, Abdullah; Okasha, Mohamed; Pérez Portero, Adrián; Gonga i Siles, Amadeu; Ramos Castro, Juan José; Oktaviani, Shindi; Edwar, Edwar; Abbas, Yasir; Purio, Mark Angelo
AlainSat-1 is an educational and scientific nanosatellite project that was initiated in late 2019 by the IEEE Geoscience and Remote Sensing Society (GRSS) along with National Space Science and Technology Center (NSSTC) of UAE University in the frame of the 2nd Student Grand Challenge [1]. The project involves close collaboration between four international universities to design, build, test and launch a remote sensing CubeSat.The spacecraft is a 3U CubeSat that has a mass of around 4 Kgs. The spacecraft has an active 3-axis control system capable of attitude determination and control to less than one degree. Two communications systems will be used on-board: a UHF System and an S-Band System. The project has passed the Critical Design Review (CDR) stage and is currently in the assembly and integration phase. The satellite is currently planned for launch to a sun-synchronous orbit on-board a Falcon 9 rocket in the second quarter of 2024.
2023-11-30T07:40:14Z
Jallad, Abdul-Halim
Camps Carmona, Adriano José
Marpu, Prashanth
AlMazrouei, Mai
Ba Layth, Ahmed
Aleissaee, Shamma
Alsalmani, Abdullah
Okasha, Mohamed
Pérez Portero, Adrián
Gonga i Siles, Amadeu
Ramos Castro, Juan José
Oktaviani, Shindi
Edwar, Edwar
Abbas, Yasir
Purio, Mark Angelo
AlainSat-1 is an educational and scientific nanosatellite project that was initiated in late 2019 by the IEEE Geoscience and Remote Sensing Society (GRSS) along with National Space Science and Technology Center (NSSTC) of UAE University in the frame of the 2nd Student Grand Challenge [1]. The project involves close collaboration between four international universities to design, build, test and launch a remote sensing CubeSat.The spacecraft is a 3U CubeSat that has a mass of around 4 Kgs. The spacecraft has an active 3-axis control system capable of attitude determination and control to less than one degree. Two communications systems will be used on-board: a UHF System and an S-Band System. The project has passed the Critical Design Review (CDR) stage and is currently in the assembly and integration phase. The satellite is currently planned for launch to a sun-synchronous orbit on-board a Falcon 9 rocket in the second quarter of 2024.
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Efficient in situ assessment of radiated emissions using time-domain measurements
http://hdl.handle.net/2117/397130
Efficient in situ assessment of radiated emissions using time-domain measurements
Solé Lloveras, Jordi; Azpúrua Auyanet, Marco Aurelio; Aragon Homar, Marc; Yoshioka, Yasutoshi; Silva Martínez, Fernando
This paper presents three different case studies where the electromagnetic emissions of atypical equipment (a photovoltaic system, a passenger boarding bridge and a pallet washing machine) have been assessed in situ using time-domain measurement systems. The magnetic field (150 kHz-30 MHz) and electric field (30 MHz-1 GHz) emissions are considered. The technical challenges encountered and the solutions adopted for each scenario will be highlighted by describing the methodology employed. The goal is to relate the empirical knowledge and know-how gained through those study cases with the specific requirements and procedures defined in the standards. In that sense, multi-channel time-domain emissions measurements have been essential to carry out those measurement campaigns efficiently. The results are summarised as lessons learned during the experiences reported in this article. This work is relevant to support the revision or development of standards about in situ EMC testing as it provides helpful evidence to validate alternative radiated emissions measurement methods under realistic conditions.
© 2023 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes,creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
2023-11-28T10:24:51Z
Solé Lloveras, Jordi
Azpúrua Auyanet, Marco Aurelio
Aragon Homar, Marc
Yoshioka, Yasutoshi
Silva Martínez, Fernando
This paper presents three different case studies where the electromagnetic emissions of atypical equipment (a photovoltaic system, a passenger boarding bridge and a pallet washing machine) have been assessed in situ using time-domain measurement systems. The magnetic field (150 kHz-30 MHz) and electric field (30 MHz-1 GHz) emissions are considered. The technical challenges encountered and the solutions adopted for each scenario will be highlighted by describing the methodology employed. The goal is to relate the empirical knowledge and know-how gained through those study cases with the specific requirements and procedures defined in the standards. In that sense, multi-channel time-domain emissions measurements have been essential to carry out those measurement campaigns efficiently. The results are summarised as lessons learned during the experiences reported in this article. This work is relevant to support the revision or development of standards about in situ EMC testing as it provides helpful evidence to validate alternative radiated emissions measurement methods under realistic conditions.
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Conducted emissions verification setup improvement for space applications
http://hdl.handle.net/2117/397125
Conducted emissions verification setup improvement for space applications
Pous Solà, Marc; Azpúrua Auyanet, Marco Aurelio; Zhao, Dongsheng; Silva Martínez, Fernando
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.
© 2023 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes,creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
2023-11-28T09:35:54Z
Pous Solà, Marc
Azpúrua Auyanet, Marco Aurelio
Zhao, Dongsheng
Silva Martínez, Fernando
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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Measuring receiver benchmark for conducted and radiated emissions testing in space applications
http://hdl.handle.net/2117/397093
Measuring receiver benchmark for conducted and radiated emissions testing in space applications
Azpúrua Auyanet, Marco Aurelio; Pous Solà, Marc; Solé Lloveras, Jordi; Zhao, Dongsheng; Silva Martínez, Fernando
This paper compares the measurement results obtained from three different implementations of measuring receivers regarding spectral level accuracy. The objective is to validate the suitability of direct sampling electromagnetic emissions measurements with respect to those delivered by a high-end EMI receiver in frequency swept and FFT modes. The experimental setups follow the verification methods described in the ECSS-E-ST-20-07C Rev.2 standard to set realistic and reproducible conditions. Between 50 kHz and 100 MHz, common mode and differential mode currents are measured when multi-sine excitation signals with controlled amplitude profiles are used as references. Subsequently, conducted and radiated emissions tests are run to investigate the correlation between measurements with the different receivers. The instruments used are a low-cost USB digitiser Picoscope PS5444D, a high-performance benchtop oscilloscope R&S RTO6 and the R&S ESW44 full-compliant EMI test receiver. The analysis concludes that the emissions measurements performed with the direct sampling approach are excellent for the intended application, exhibiting an accuracy comparable to the dedicated EMI test receiver and a well-adequate dynamic range and noise level.
© 2023 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes,creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
2023-11-28T07:38:42Z
Azpúrua Auyanet, Marco Aurelio
Pous Solà, Marc
Solé Lloveras, Jordi
Zhao, Dongsheng
Silva Martínez, Fernando
This paper compares the measurement results obtained from three different implementations of measuring receivers regarding spectral level accuracy. The objective is to validate the suitability of direct sampling electromagnetic emissions measurements with respect to those delivered by a high-end EMI receiver in frequency swept and FFT modes. The experimental setups follow the verification methods described in the ECSS-E-ST-20-07C Rev.2 standard to set realistic and reproducible conditions. Between 50 kHz and 100 MHz, common mode and differential mode currents are measured when multi-sine excitation signals with controlled amplitude profiles are used as references. Subsequently, conducted and radiated emissions tests are run to investigate the correlation between measurements with the different receivers. The instruments used are a low-cost USB digitiser Picoscope PS5444D, a high-performance benchtop oscilloscope R&S RTO6 and the R&S ESW44 full-compliant EMI test receiver. The analysis concludes that the emissions measurements performed with the direct sampling approach are excellent for the intended application, exhibiting an accuracy comparable to the dedicated EMI test receiver and a well-adequate dynamic range and noise level.
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3D printed probe for simultaneous E and H fields measurements
http://hdl.handle.net/2117/387352
3D printed probe for simultaneous E and H fields measurements
Quílez Figuerola, Marcos; Pous Solà, Marc; Mateu Mateus, Marc; Solé Lloveras, Jordi; Silva Martínez, Fernando
Additive manufacturing using conductive polylactic acid (PLA) is an emerging technology. This work presents a double-loaded loop probe made of conductive PLA and evaluates its performance compared to a previous design built on a printed circuit board (PCB). The results show that constructing near-field probes using 3D printing with conductive PLA is feasible.
2023-05-12T07:43:18Z
Quílez Figuerola, Marcos
Pous Solà, Marc
Mateu Mateus, Marc
Solé Lloveras, Jordi
Silva Martínez, Fernando
Additive manufacturing using conductive polylactic acid (PLA) is an emerging technology. This work presents a double-loaded loop probe made of conductive PLA and evaluates its performance compared to a previous design built on a printed circuit board (PCB). The results show that constructing near-field probes using 3D printing with conductive PLA is feasible.
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On the application of short-term heart rate variability indices to track changes in cognitive arousal
http://hdl.handle.net/2117/386808
On the application of short-term heart rate variability indices to track changes in cognitive arousal
Mohammadpoor Faskhodi, Mahtab; García González, Miguel Ángel
Studies have demonstrated that Heart Rate Variability (HRV) can be utilized as an effective tool for monitoring the level of arousal. The autonomic nervous system (ANS) is frequently measured by heart rate and principally controlled by the coordinated parasympathetic and sympathetic systems, which also regulate fluctuations in arousal. In HRV studies short-term analysis is more affordable and easier to measure rather than long-term analysis. Here, to track arousal changes, 31 participants (18 male and 13 female) with a mean age of 32 years were examined in both relaxed and aroused stages. Relax and arousal states are measured in two stages, each lasting five minutes. Relaxed status was carried out with closed eyes and listening to nature sounds. The arousal status was performed by playing a Stroop test while listening to traffic noise or death metal music. After data acquisition, 28 HRV features are calculated for each five-minute epoch. The observations have demonstrated that novel indices such as FnQ and ACI produced better results in arousal detection by using short-term (5 min) HRV analysis among all of the obtained indices. Moreover, the performance of ACI was significantly superior to the rest since it is a robust and easy-to-compute index. Consequently, ACI can be used as a powerful tool for monitoring cognitive arousal.
2023-04-28T10:54:22Z
Mohammadpoor Faskhodi, Mahtab
García González, Miguel Ángel
Studies have demonstrated that Heart Rate Variability (HRV) can be utilized as an effective tool for monitoring the level of arousal. The autonomic nervous system (ANS) is frequently measured by heart rate and principally controlled by the coordinated parasympathetic and sympathetic systems, which also regulate fluctuations in arousal. In HRV studies short-term analysis is more affordable and easier to measure rather than long-term analysis. Here, to track arousal changes, 31 participants (18 male and 13 female) with a mean age of 32 years were examined in both relaxed and aroused stages. Relax and arousal states are measured in two stages, each lasting five minutes. Relaxed status was carried out with closed eyes and listening to nature sounds. The arousal status was performed by playing a Stroop test while listening to traffic noise or death metal music. After data acquisition, 28 HRV features are calculated for each five-minute epoch. The observations have demonstrated that novel indices such as FnQ and ACI produced better results in arousal detection by using short-term (5 min) HRV analysis among all of the obtained indices. Moreover, the performance of ACI was significantly superior to the rest since it is a robust and easy-to-compute index. Consequently, ACI can be used as a powerful tool for monitoring cognitive arousal.
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Design and validation of a test fixture for studying RF current flux through mechanical aircraft joints
http://hdl.handle.net/2117/379639
Design and validation of a test fixture for studying RF current flux through mechanical aircraft joints
Solé Lloveras, Jordi; Azpúrua Auyanet, Marco Aurelio; Pous Solà, Marc; Quílez Figuerola, Marcos; Silva Martínez, Fernando
The study of electric currents flowing through the airframe is important from an EMC standpoint due to the potential to cause severe aircraft failures. Nevertheless, this is a challenging task because of the complex shape, materials, joints, and apertures found in most fuselages. In this paper, we present the design, simulation, and experimental validation of a test fixture intended to emulate the discontinuity between two fuselage panels mechanically attached. This fixture allows several configurations of the mechanical joint, as well as, the insertion of current probes. The main features of the fixture are analysed, such as bandwidth and frequency performance. Subsequently, simulation and S-parameters measurements are used to investigate the performance of several screwed joint configurations.
© 2022 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes,creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
2023-01-10T07:46:45Z
Solé Lloveras, Jordi
Azpúrua Auyanet, Marco Aurelio
Pous Solà, Marc
Quílez Figuerola, Marcos
Silva Martínez, Fernando
The study of electric currents flowing through the airframe is important from an EMC standpoint due to the potential to cause severe aircraft failures. Nevertheless, this is a challenging task because of the complex shape, materials, joints, and apertures found in most fuselages. In this paper, we present the design, simulation, and experimental validation of a test fixture intended to emulate the discontinuity between two fuselage panels mechanically attached. This fixture allows several configurations of the mechanical joint, as well as, the insertion of current probes. The main features of the fixture are analysed, such as bandwidth and frequency performance. Subsequently, simulation and S-parameters measurements are used to investigate the performance of several screwed joint configurations.