2019 URSI Asia-Pacific Radio Science Conference (AP-RASC)最新文献

Approaches for Interference-proof Future Radar Systems 抗干扰的未来雷达系统方法

2019 URSI Asia-Pacific Radio Science Conference (AP-RASC) Pub Date : 2019-06-20 DOI: 10.23919/URSIAP-RASC.2019.8738625

Z. Slavik, O. Bringmann, W. Rosenstiel

引用次数: 0

Evaluation of Dielectric Measurements upon Thin Single Layer Solids using OpenCoaxial Probe Technology 利用开放同轴探针技术评价薄单层固体介质测量

2019 URSI Asia-Pacific Radio Science Conference (AP-RASC) Pub Date : 2019-06-20 DOI: 10.23919/URSIAP-RASC.2019.8738398

Sina Hashemizadeh, Y. Kato, M. Horibe, N. Kuster

引用次数: 0

mm-Wave Experimental Scanning System to Determine the Complete Field by Near-to-Near Field and Near-to-Far Field Transformation 利用近场到近场和近场到远场变换确定完整场的毫米波实验扫描系统

2019 URSI Asia-Pacific Radio Science Conference (AP-RASC) Pub Date : 2019-06-20 DOI: 10.23919/URSIAP-RASC.2019.8738210

S. Pfeifer, N. Jain, S. Kuehn, E. Neufeld, K. Pokovic, J. Xi, A. Christ, N. Kuster

引用次数: 2

On correlation between SID monitor and GPS-derived TEC observations during a massive ionospheric storm development 大规模电离层风暴发展过程中SID监测与gps衍生TEC观测的相关性研究

2019 URSI Asia-Pacific Radio Science Conference (AP-RASC) Pub Date : 2019-03-26 DOI: 10.23919/URSIAP-RASC.2019.8738664

M. Filic, R. Filjar

{"title":"On correlation between SID monitor and GPS-derived TEC observations during a massive ionospheric storm development","authors":"M. Filic, R. Filjar","doi":"10.23919/URSIAP-RASC.2019.8738664","DOIUrl":"https://doi.org/10.23919/URSIAP-RASC.2019.8738664","url":null,"abstract":"Space weather, geomagnetic and ionospheric conditions are the most prominent single cause of the Global Navigation Satellite System (GNSS) positioning performance degradation, through introduction of the GNSS signal ionospheric delay. This affects numerous GNSS-based technology and socio-economic systems and services. Analyses of case-studies of GNSS positioning performance degradation contribute to characterization of the GNSS positioning error, and support error correction methods and models development. Here a case of rapidly developing ionospheric storm is examined, with the aim of the event characterization using a low-cost Sudden Ionospheric Disturbance (SID) monitor observations of lower ionospheric levels condition through continuous reception of Very Low Frequency (VLF) signal strength values. Time series of observations, taken in Croatia during the St Patrick 2015 event of fast development of the large ionospheric storm, were compared with time series of dual-frequency GPS-derived observations of Total Electronic Content (TEC), a parameter linearly related to GNSS ionospheric delay. A comparison framework has been developed in the open-source R programming framework for statistical computing. Time series of SID and GNSS-based TEC observations were examined for cross-correlation. The research revealed correspondence between two time series. Although not linear, the correspondence identified may be used for an early warning for potential GNSS positioning performance deterioration. Further to this, it may serve as the foundation for understanding of the lower ionosphere contribution to the over-all TEC, and thus to formation of the GNSS ionospheric delay. Our team intends to explore both research directions in forthcoming studies.","PeriodicalId":344386,"journal":{"name":"2019 URSI Asia-Pacific Radio Science Conference (AP-RASC)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116645430","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}

引用次数: 5

Enabling Technologies for High Performance Microwave and MM wave Interferometric Radiometers 高性能微波和毫米波干涉辐射计的使能技术

2019 URSI Asia-Pacific Radio Science Conference (AP-RASC) Pub Date : 2019-03-09 DOI: 10.23919/URSIAP-RASC.2019.8738678

Hao Liu, Lijie Niu, Wei Chen, Hao Lu, Cheng Zhang, Ji Wu

引用次数: 1

The low period atmospheric gravity waves observed using Very Low Frequency signals 用甚低频信号观测低周期大气重力波

2019 URSI Asia-Pacific Radio Science Conference (AP-RASC) Pub Date : 2019-03-09 DOI: 10.23919/URSIAP-RASC.2019.8738659

A. Maurya, M. Cohen, K. N. Kumar, D. Phanikumar, Rajesh Singh

{"title":"The low period atmospheric gravity waves observed using Very Low Frequency signals","authors":"A. Maurya, M. Cohen, K. N. Kumar, D. Phanikumar, Rajesh Singh","doi":"10.23919/URSIAP-RASC.2019.8738659","DOIUrl":"https://doi.org/10.23919/URSIAP-RASC.2019.8738659","url":null,"abstract":"It has been known that the atmospheric gravity waves (AGWs) play a major role in shaping up the structure and dynamics of lower, middle and upper atmosphere [1, 2], and relates to various phenomena in the thermosphere. VLF remote sensing is a well-established technique to monitor D-region conditions, including AGWs. We have analyzed various VLF navigation transmitter signals recorded at VLF recording station in North Carolina, USA, called PARI (35.2 N, 82.9 W) for a one-year period from May 2015 to April 2016. The VLF signal (both amplitude and phase) show wave like signature (WLS) in different Transmitter-receiver great circle path (TRGCPs). We have found three event days namely 02 May 2015, 21 January 2016 and 21 April 2016, with periodic variations of 1.2 -3 minutes. One example of observed Wavy signature on VLF transmitter on 21 January 2016 is shown as Figure 1. In general, the period of AGWs is longer than the background oscillations known as Brunt-Vaisala period (BV period) but in the present case observed periods are much lower than the BV periods (∼5 minutes). Initial analysis suggests that the probable source of observed WLSs is convective (from lightning discharges/thunderstorm) generated AGWs propagating upward from troposphere. The source regions are identified using lightning location network and satellite data. The more details on the properties and possible source are discussed.","PeriodicalId":344386,"journal":{"name":"2019 URSI Asia-Pacific Radio Science Conference (AP-RASC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125890752","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}

引用次数: 0

Reconfigurable MEMS metamaterial based active THz photonics 基于有源太赫兹光子学的可重构MEMS超材料

2019 URSI Asia-Pacific Radio Science Conference (AP-RASC) Pub Date : 2019-03-09 DOI: 10.23919/URSIAP-RASC.2019.8738366

Manukumara Manjappa, Prakash Pitchappa, Ranjan Singh

引用次数: 0

Microwave photonic signal processing exploiting coherent interactions between Brillouin Stokes and anti-Stokes resonances 利用布里渊斯托克斯和反斯托克斯共振之间相干相互作用的微波光子信号处理

2019 URSI Asia-Pacific Radio Science Conference (AP-RASC) Pub Date : 2019-03-09 DOI: 10.23919/URSIAP-RASC.2019.8738430

R. Pant, S. A.

{"title":"Microwave photonic signal processing exploiting coherent interactions between Brillouin Stokes and anti-Stokes resonances","authors":"R. Pant, S. A.","doi":"10.23919/URSIAP-RASC.2019.8738430","DOIUrl":"https://doi.org/10.23919/URSIAP-RASC.2019.8738430","url":null,"abstract":"Generation and processing of RF signals using photonic technologies enable electromagnetic interference (EMI) free low loss, light weight microwave photonic processor [1]. Generation of RF signals is typically achieved by beating multiple optical frequencies, which are created by exploiting nonlinear optical phenomenon in high-Q resonators [2]. RF photonic signal processing, on the other hand, is performed by modulating a laser with the incoming RF signal and processing one of the modulation side bands using active or passive optical resonance to achieve microwave photonic notch filter, RF switch, etc. [3]. Many of these photonics based RF signal processors use a phase modulator or a dual-parallel Mach-Zehnder modulator and a passive filter to create out-of-phase side bands with unequal amplitude. An active or passive resonance is then used to equalize the amplitude of the two out-of-phase sidebands [3, 4]. The resulting destructive interference between the beat signals, which are obtained by beating of the carrier with upper and lower sidebands, results in creation of a rejection band centered at the frequency of equal amplitude. Since the two sidebands are out-of-phase, the induced insertion loss is high because of cancellation in the pass band.","PeriodicalId":344386,"journal":{"name":"2019 URSI Asia-Pacific Radio Science Conference (AP-RASC)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121506252","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}

引用次数: 0

A Compact Low Profile Modified ACS-fed Triple Band Open-Ended Metamaterial Antenna for UMTS, WLAN, and WiMAX Applications 用于UMTS, WLAN和WiMAX应用的紧凑型低轮廓改进acs馈电三频带开放式超材料天线

2019 URSI Asia-Pacific Radio Science Conference (AP-RASC) Pub Date : 2019-03-09 DOI: 10.23919/URSIAP-RASC.2019.8738646

M. Ameen, S. Kalraiya, R. Chaudhary

引用次数: 3

In-situ synthesis of (Mg0.5Zn0.5)Fe2O4-graphene oxide nanocomposite for broadband microwave absorption in GHz frequency range 原位合成(Mg0.5Zn0.5) fe2o4 -氧化石墨烯纳米复合材料用于GHz频段宽带微波吸收

2019 URSI Asia-Pacific Radio Science Conference (AP-RASC) Pub Date : 2019-03-09 DOI: 10.23919/URSIAP-RASC.2019.8738396

Rajarshi Bhattacharyya, Jyoti, Aman Gupta, O. Prakash, Somnath C. Roy, Tapas Bhattacharyya, P. Maiti, Somak Bhattacharyya, Santanu Das

{"title":"In-situ synthesis of (Mg0.5Zn0.5)Fe2O4-graphene oxide nanocomposite for broadband microwave absorption in GHz frequency range","authors":"Rajarshi Bhattacharyya, Jyoti, Aman Gupta, O. Prakash, Somnath C. Roy, Tapas Bhattacharyya, P. Maiti, Somak Bhattacharyya, Santanu Das","doi":"10.23919/URSIAP-RASC.2019.8738396","DOIUrl":"https://doi.org/10.23919/URSIAP-RASC.2019.8738396","url":null,"abstract":"We report the in-situ synthesis of (M$g_{0.5} Zn_{0.5}$)$Fe_{2}O_{4}$-graphene oxide (MZF-GO) ferrite nanoparticle hybrid nanocomposite by auto-combustion technique followed by fabrication of homogeneous, structurally stable thin layer (-100-120 $mu$m) of nanocomposite-polyurethane coating on metallic substrate (A1) and its application on the properties of broadband microwave absorption over the gigahertz (GHz) frequency range. Microstructure studies of nanocomposites depicted that small sized ferrite nanoparticles $(-24 pm 6 nm)$ are grafted on and through the graphene layers, which forms a homogeneous coating. The nanocomposite-polymer coating demonstrated excellent broadband absorption properties with absorptivity of greater than 85%. The nanocomposite-polymer coating showed good absorptivity over the frequency band of 4-15 GHz, which has numerous practical applications as radar absorbing materials (RAM), stealth technology, electromagnetic shielding, and many more.","PeriodicalId":344386,"journal":{"name":"2019 URSI Asia-Pacific Radio Science Conference (AP-RASC)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133303685","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}

引用次数: 0