Pub Date : 2022-05-29DOI: 10.23919/AT-AP-RASC54737.2022.9814376
Stefânia Faria, M. Vala, N. Leonor, J. Felício, C. Fernandes, C. Salema, R. Caldeirinha
This paper presents an electrical modelling of radiowave propagation in a fire environment. A small-scale forest represented by 8 Pinus Pinaster trees was designed using the Fire Dynamics Simulator (FDS). The excess loss introduced by fire was evaluated using the Cold Plasma Model (CPM) and the Transmission Line Method (TLM), for a 385 MHz plane wave normally incident. Statistical analysis of the estimated overall attenuation is presented, in addition to the minimum and maximum relative permittivity and refractive index values across the measurement volume.
{"title":"Modelling of Radiowave Propagation Through Small-scale Forest Fire","authors":"Stefânia Faria, M. Vala, N. Leonor, J. Felício, C. Fernandes, C. Salema, R. Caldeirinha","doi":"10.23919/AT-AP-RASC54737.2022.9814376","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814376","url":null,"abstract":"This paper presents an electrical modelling of radiowave propagation in a fire environment. A small-scale forest represented by 8 Pinus Pinaster trees was designed using the Fire Dynamics Simulator (FDS). The excess loss introduced by fire was evaluated using the Cold Plasma Model (CPM) and the Transmission Line Method (TLM), for a 385 MHz plane wave normally incident. Statistical analysis of the estimated overall attenuation is presented, in addition to the minimum and maximum relative permittivity and refractive index values across the measurement volume.","PeriodicalId":356067,"journal":{"name":"2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC)","volume":"40 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129118024","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-05-29DOI: 10.23919/AT-AP-RASC54737.2022.9814320
Nidhi, Bahram Khan, A. Mihovska, R. Prasad, F. J. Velez
This work aims to provide a detailed study on Carrier Aggregation (CA) techniques for 5G New Radio (5G NR) networks while elaborating on CA deployment scenarios, CA-enabled 5G networks, and resource management and scheduling techniques. CA empowers the User Equipment (UE) and the network to aggregate carrier frequencies in licensed, unlicensed, or Shared Access (SA) bands of the same or different spectrum bands to boost the achieved data rates. We also analyze the cross-carrier scheduling scheme in CA-enabled 5G networks for Downlink (DL) resource allocation. The requirements, challenges, and opportunities are addressed in the allocation of Resource Blocks (RBs) and Component Carriers (CCs). The study and analysis of various multi-band scheduling techniques are made while keeping in mind that high throughput and reduced power usage needs to be achieved at the UE. Finally, we present CA as the critical enabler to advanced systems while discussing how it meets the demands and holds the potential to support beyond 5G networks. To conclude, we discuss many open issues in resource allocation and scheduling techniques.
{"title":"A Study on Cross-Carrier Scheduler for Carrier Aggregation in Beyond 5G Networks","authors":"Nidhi, Bahram Khan, A. Mihovska, R. Prasad, F. J. Velez","doi":"10.23919/AT-AP-RASC54737.2022.9814320","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814320","url":null,"abstract":"This work aims to provide a detailed study on Carrier Aggregation (CA) techniques for 5G New Radio (5G NR) networks while elaborating on CA deployment scenarios, CA-enabled 5G networks, and resource management and scheduling techniques. CA empowers the User Equipment (UE) and the network to aggregate carrier frequencies in licensed, unlicensed, or Shared Access (SA) bands of the same or different spectrum bands to boost the achieved data rates. We also analyze the cross-carrier scheduling scheme in CA-enabled 5G networks for Downlink (DL) resource allocation. The requirements, challenges, and opportunities are addressed in the allocation of Resource Blocks (RBs) and Component Carriers (CCs). The study and analysis of various multi-band scheduling techniques are made while keeping in mind that high throughput and reduced power usage needs to be achieved at the UE. Finally, we present CA as the critical enabler to advanced systems while discussing how it meets the demands and holds the potential to support beyond 5G networks. To conclude, we discuss many open issues in resource allocation and scheduling techniques.","PeriodicalId":356067,"journal":{"name":"2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126547860","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-05-29DOI: 10.23919/AT-AP-RASC54737.2022.9814215
R. Kar, M. Aksoy, Dua Kaurejo
This paper discusses the retrieval of Antarctic firn subsurface temperatures as a function of depth via multi-frequency microwave radiometer measurements focusing on the Concordia station. To demonstrate the feasibility of the retrieval, we investigated the correlation between the brightness temperatures measured by the GPM (Global precipitation Measurement) constellation radiometers at various frequencies and the subsurface temperatures of the Antarctic firn at various depths near the Concordia station.
{"title":"Multi-Frequency Microwave Radiometry for Retrieving Antarctic Firn Subsurface Temperatures","authors":"R. Kar, M. Aksoy, Dua Kaurejo","doi":"10.23919/AT-AP-RASC54737.2022.9814215","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814215","url":null,"abstract":"This paper discusses the retrieval of Antarctic firn subsurface temperatures as a function of depth via multi-frequency microwave radiometer measurements focusing on the Concordia station. To demonstrate the feasibility of the retrieval, we investigated the correlation between the brightness temperatures measured by the GPM (Global precipitation Measurement) constellation radiometers at various frequencies and the subsurface temperatures of the Antarctic firn at various depths near the Concordia station.","PeriodicalId":356067,"journal":{"name":"2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125174243","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-05-29DOI: 10.23919/AT-AP-RASC54737.2022.9814330
Johannes Popp, Lukas Seitner, M. Haider, C. Jirauschek
We demonstrate a full-wave numerical Maxwell-Bloch simulation tool including perfectly matched layer (PML) absorbing boundary conditions. To avoid detrimental reflection errors at the boundary of the simulation domain, an adapted PML model is introduced, which takes into account impedance mismatch effects arising from the internal quantum system. For the numerical validation of the modified PML model the simulation tool is applied to the active gain medium of a terahertz quantum cascade laser (QCL) structure. Improved absorbing characteristics for the truncation of active gain media in our Maxwell-Bloch simulation approach are obtained.
{"title":"Reducing the reflection error of PML absorbing boundary conditions within a generalized Maxwell-Bloch framework","authors":"Johannes Popp, Lukas Seitner, M. Haider, C. Jirauschek","doi":"10.23919/AT-AP-RASC54737.2022.9814330","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814330","url":null,"abstract":"We demonstrate a full-wave numerical Maxwell-Bloch simulation tool including perfectly matched layer (PML) absorbing boundary conditions. To avoid detrimental reflection errors at the boundary of the simulation domain, an adapted PML model is introduced, which takes into account impedance mismatch effects arising from the internal quantum system. For the numerical validation of the modified PML model the simulation tool is applied to the active gain medium of a terahertz quantum cascade laser (QCL) structure. Improved absorbing characteristics for the truncation of active gain media in our Maxwell-Bloch simulation approach are obtained.","PeriodicalId":356067,"journal":{"name":"2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC)","volume":"147 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122614345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-05-29DOI: 10.23919/AT-AP-RASC54737.2022.9814298
Fernández Ruiz Mario, Bussons Gordo Javier, P. Manuel, Monstein Christian
The aim of this work is to build a complete system based on deep neural networks for automated burst recognition in radio spectrograms delivered by ground-based solar observatories.In this summary paper, the automatic system is described stage by stage and preliminary results for a sample observatory are presented.
{"title":"Automatic detection of e-Callisto solar radio bursts by Deep Neural Networks","authors":"Fernández Ruiz Mario, Bussons Gordo Javier, P. Manuel, Monstein Christian","doi":"10.23919/AT-AP-RASC54737.2022.9814298","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814298","url":null,"abstract":"The aim of this work is to build a complete system based on deep neural networks for automated burst recognition in radio spectrograms delivered by ground-based solar observatories.In this summary paper, the automatic system is described stage by stage and preliminary results for a sample observatory are presented.","PeriodicalId":356067,"journal":{"name":"2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC)","volume":"48 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127595390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-05-29DOI: 10.23919/AT-AP-RASC54737.2022.9814185
E. Astafyeva, B. Maletckii, M. Ravanelli, L. Rolland, D. Mikesell, P. Coisson, F. Manta, E. Munaibari, P. Lognonné
On January 15, 2022, the Hunga Tonga-Hunga Ha’apai (HHTH) volcano began to erupt at 04:14:45UT. The submarine HTHH volcano sent a plume of ash that reached as high as 33-35 km of altitude and generated a giant atmospheric shock wave that propagated around the world. The event seemed to generate two tsunamis: the one was generated by the underwater eruption and the other was triggered by the atmospheric shock that propagated faster than normal tsunami and was of larger magnitude. The shock waves and tsunami waves reached the ionosphere [e.g., 1 , 2 , 3 ].
2022年1月15日，Hunga Tonga-Hunga Ha 'apai火山(HHTH)在04:14:45UT开始喷发。海底HTHH火山喷出的火山灰高达33-35公里，并产生了巨大的大气冲击波，传播到世界各地。这一事件似乎引发了两场海啸:一场是由水下喷发引起的，另一场是由大气冲击引发的，其传播速度比普通海啸快，震级也更大。冲击波和海啸波到达电离层[例1、2、3]。
{"title":"How the 15 January 2022 Hunga Tonga- Hunga Ha’pai volcano eruption shook the ionosphere","authors":"E. Astafyeva, B. Maletckii, M. Ravanelli, L. Rolland, D. Mikesell, P. Coisson, F. Manta, E. Munaibari, P. Lognonné","doi":"10.23919/AT-AP-RASC54737.2022.9814185","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814185","url":null,"abstract":"On January 15, 2022, the Hunga Tonga-Hunga Ha’apai (HHTH) volcano began to erupt at 04:14:45UT. The submarine HTHH volcano sent a plume of ash that reached as high as 33-35 km of altitude and generated a giant atmospheric shock wave that propagated around the world. The event seemed to generate two tsunamis: the one was generated by the underwater eruption and the other was triggered by the atmospheric shock that propagated faster than normal tsunami and was of larger magnitude. The shock waves and tsunami waves reached the ionosphere [e.g., 1 , 2 , 3 ].","PeriodicalId":356067,"journal":{"name":"2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133160258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-05-29DOI: 10.23919/AT-AP-RASC54737.2022.9814294
S. Kishimoto, S. Ohnuki
In this manuscript, the novel computational technique of specific energy loss is proposed for pulse incidence. The specific energy until the observation time can be directly computed by our proposed method.
本文提出了一种计算脉冲入射比能量损失的新方法。该方法可直接计算到观测时间的比能。
{"title":"Analysis of Specific Energy Loss by Fast Inverse Laplace Transform","authors":"S. Kishimoto, S. Ohnuki","doi":"10.23919/AT-AP-RASC54737.2022.9814294","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814294","url":null,"abstract":"In this manuscript, the novel computational technique of specific energy loss is proposed for pulse incidence. The specific energy until the observation time can be directly computed by our proposed method.","PeriodicalId":356067,"journal":{"name":"2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC)","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131771396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-05-29DOI: 10.23919/AT-AP-RASC54737.2022.9814239
Luciana Rossato Spatafora, P. Savi, R. Alvalá, A. P. Cunha, J. Marengo, Marcelo Zeri, M. Vall-llossera, Miriam Plablos
A model for monitoring agricultural drought (SIMAGRI) has been developed in Brazil. This model is based on gridded precipitation product, real evapotranspiration calculated from vegetation index data (as proposed by [1]), and soil water storage. The soil water storage is derived from the estimation of field capacity and wilting point using pedo-transfer functions (PTFs). The SIMAGRI model suggest that the soil moisture influence is unquestionably a quantitative indicator of drought. In addition, using this model, it is possible to monitor drought episodes in agricultural regions of Brazil, especially over the Northeast, where vulnerability to drought is the highest in the country due to the prevalence of rain fed agricultural practice and frequent droughts.
{"title":"Evaluating the soil moisture retrievals for agricultural drought monitoring over Brazil","authors":"Luciana Rossato Spatafora, P. Savi, R. Alvalá, A. P. Cunha, J. Marengo, Marcelo Zeri, M. Vall-llossera, Miriam Plablos","doi":"10.23919/AT-AP-RASC54737.2022.9814239","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814239","url":null,"abstract":"A model for monitoring agricultural drought (SIMAGRI) has been developed in Brazil. This model is based on gridded precipitation product, real evapotranspiration calculated from vegetation index data (as proposed by [1]), and soil water storage. The soil water storage is derived from the estimation of field capacity and wilting point using pedo-transfer functions (PTFs). The SIMAGRI model suggest that the soil moisture influence is unquestionably a quantitative indicator of drought. In addition, using this model, it is possible to monitor drought episodes in agricultural regions of Brazil, especially over the Northeast, where vulnerability to drought is the highest in the country due to the prevalence of rain fed agricultural practice and frequent droughts.","PeriodicalId":356067,"journal":{"name":"2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124305478","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-05-29DOI: 10.23919/AT-AP-RASC54737.2022.9814313
Herman Alexander Jaeger, Kilian O'Donoghue, P. Cantillon-Murphy
Electromagnetic tracking is a navigation technology used in guided medical interventions. The technology is gaining popularity in the fields of robotic surgery, catheter navigation and human-machine interface design. Small magnetic sensors provide enable the position and orientation of a surgical instrument to be tracked in real-time without line of sight. This paper discusses how low frequency electromagnetic fields are used as a tracking medium to precisely estimate the pose of magnetic sensors. The quasi-static approach to magnetic field modelling is presented along with number of pose estimation methods. Advantages and disadvantages of each system type are also discussed.
{"title":"Electromagnetic tracking in guided medical interventions","authors":"Herman Alexander Jaeger, Kilian O'Donoghue, P. Cantillon-Murphy","doi":"10.23919/AT-AP-RASC54737.2022.9814313","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814313","url":null,"abstract":"Electromagnetic tracking is a navigation technology used in guided medical interventions. The technology is gaining popularity in the fields of robotic surgery, catheter navigation and human-machine interface design. Small magnetic sensors provide enable the position and orientation of a surgical instrument to be tracked in real-time without line of sight. This paper discusses how low frequency electromagnetic fields are used as a tracking medium to precisely estimate the pose of magnetic sensors. The quasi-static approach to magnetic field modelling is presented along with number of pose estimation methods. Advantages and disadvantages of each system type are also discussed.","PeriodicalId":356067,"journal":{"name":"2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC)","volume":"32 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125707299","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-05-29DOI: 10.23919/AT-AP-RASC54737.2022.9814337
Ahmet Bilir, O. K. Erden, S. Dumanli
Tracking the ablated region in real-time can be advantageous during microwave ablation. In this study, an antenna array that ablates the tissue and monitors the ablation process is proposed. Monitoring is realized by tracking the coupling between the array elements which changes during ablation. That is because the permittivity and conductivity of organic tissues depend on temperature. The proposal is demonstrated through a hepatic tumor example with cascaded thermal and electromagnetic simulations. As the array element, a coaxial slot antenna is designed to operate at 2.45 GHz. The temperature-dependent permittivity and conductivity values are calculated through thermal simulations which contain both healthy and malignant tissues. It has been shown that the application of ablation with an output of 10 W per antenna causes a considerable change in coupling. A 100 MHz shift in frequency and 2.5 dB change in magnitude have been observed after 300 seconds.
{"title":"Coaxial Slot Antenna Array Design for Microwave Ablation and Monitoring","authors":"Ahmet Bilir, O. K. Erden, S. Dumanli","doi":"10.23919/AT-AP-RASC54737.2022.9814337","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814337","url":null,"abstract":"Tracking the ablated region in real-time can be advantageous during microwave ablation. In this study, an antenna array that ablates the tissue and monitors the ablation process is proposed. Monitoring is realized by tracking the coupling between the array elements which changes during ablation. That is because the permittivity and conductivity of organic tissues depend on temperature. The proposal is demonstrated through a hepatic tumor example with cascaded thermal and electromagnetic simulations. As the array element, a coaxial slot antenna is designed to operate at 2.45 GHz. The temperature-dependent permittivity and conductivity values are calculated through thermal simulations which contain both healthy and malignant tissues. It has been shown that the application of ablation with an output of 10 W per antenna causes a considerable change in coupling. A 100 MHz shift in frequency and 2.5 dB change in magnitude have been observed after 300 seconds.","PeriodicalId":356067,"journal":{"name":"2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131843145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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