2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama)最新文献_第9页

Link Budget Analysis for Dual Sideband Optical Carrier Suppression RoF System 双边带光载波抑制RoF系统链路预算分析

2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama) Pub Date : 2018-08-01 DOI: 10.23919/PIERS.2018.8598031

S. Yaakob, S. M. Idrus, M. Z. Abdul Kadir, M. S. Salleh, R. Mohamad, C. Rashidi, Z. Zan, M. Mahdi

引用次数: 0

Suppression of Distant Aperture Sidelobes in Linear and Planar Phased Arrays 线性与平面相控阵中远距离孔径副瓣的抑制

2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama) Pub Date : 2018-08-01 DOI: 10.23919/PIERS.2018.8597725

V. Gusevsky, O. N. Tsvetkova

引用次数: 0

Vision-Based and Differential Global Positioning System to Ensure Precise Autonomous Landing of UAVs 基于视觉的差分全球定位系统确保无人机的精确自主着陆

2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama) Pub Date : 2018-08-01 DOI: 10.23919/PIERS.2018.8598179

P. Marcon, J. Janousek, R. Kadlec

{"title":"Vision-Based and Differential Global Positioning System to Ensure Precise Autonomous Landing of UAVs","authors":"P. Marcon, J. Janousek, R. Kadlec","doi":"10.23919/PIERS.2018.8598179","DOIUrl":"https://doi.org/10.23919/PIERS.2018.8598179","url":null,"abstract":"This paper presents a precision landing system for unmanned aerial vehicles (UAVs). When designing the solution, we paid special attention to the required accuracy of the various sensors. The system comprises a highly accurate flight controller and a visual sensor for object detection or Real Time Kinematic (RTK) positioning module. The platform is constructed to integrate into various types of unmanned aerial vehicles. The method for the visual tracking of the landing platform via an optical camera enables us to increase the landing reliability. The precise position of the unmanned aerial vehicle at landing is provided by an image analysis where the specially designed landing platform is detected. All calculations for precision landing guidance are performed directly on board. An infrared (IR) camera is used as the main sensor for monitoring the IR light beam. This aircraft guidance technique does not necessitate data transfer to and from the landing station. More complex but expensive systems is RTK GPS (Real Time Kinematic Global Positioning System) which can be suitable solution to replace visual sensor. A hexacopter drone was used for the test flights, and the results obtained were then subjected to comparison. The navigation to the location was first tested by a GPS sensor only, subsequent tests flights, however, already relied on a visual sensor and RTK GPS module.","PeriodicalId":355217,"journal":{"name":"2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127857927","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: 9

Naive Beamforming for Multi-Element Antenna GNSS Receiver 多单元天线GNSS接收机的朴素波束形成

2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama) Pub Date : 2018-08-01 DOI: 10.23919/PIERS.2018.8597615

I. Korogodin

引用次数: 2

Theorem for the Identity of the $G_{1}(c, n)$ and $L_{1}(c, n)$ Numbers and Its Application to the Theory of Waveguides $G_{1}(c, n)$和$L_{1}(c， n)$数的恒等式及其在波导理论中的应用

2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama) Pub Date : 2018-08-01 DOI: 10.23919/PIERS.2018.8597760

G. Georgiev, M. Georgieva-Grosse

{"title":"Theorem for the Identity of the $G_{1}(c, n)$ and $L_{1}(c, n)$ Numbers and Its Application to the Theory of Waveguides","authors":"G. Georgiev, M. Georgieva-Grosse","doi":"10.23919/PIERS.2018.8597760","DOIUrl":"https://doi.org/10.23919/PIERS.2018.8597760","url":null,"abstract":"It is proved numerically that for the same restricted positive integers <tex>$c$</tex> and natural numbers <tex>$n$</tex> the real positive numbers <tex>$G_{1}(c, n)$</tex> and <tex>$L_{1}(c, n)$</tex>, connected with certain kinds of zeros of the complex Kummer confluent hypergeometric function <tex>$Phi(a, c;x)$</tex> of a specially selected complex first parameter <tex>$a$</tex>, second parameter <tex>$c$</tex>-acquiring values, as pointed out above and a positive purely imaginary variable <tex>$x$</tex>, coincide, provided <tex>$n$</tex> designates the number of the zeros mentioned. This statement is advanced as a Theorem for the identity of the <tex>$G_{1}(c, n)$</tex> and <tex>$L_{1}(c, n)$</tex> numbers. The physical interpretation of the truthfulness of the result established made, reflects the possibility to substantiate in two different ways the existence of specific envelope curves in (to compute by means of two algorithms) the phase diagrams of the azimuthally magnetized circular ferrite waveguide for normal <tex>$TE_{0n}$</tex> modes in case of negative magnetization which bound the wave propagation from the side of higher frequencies.","PeriodicalId":355217,"journal":{"name":"2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129251074","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: 1

E-Polarized Diffraction by a Lossy Dielectric Wedge 有耗介质楔的e偏振衍射

2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama) Pub Date : 2018-08-01 DOI: 10.23919/PIERS.2018.8598223

S. Y. Kim

引用次数: 1

SRCNN-Based Enhanced Imaging for Low Frequency Radar 基于srcnn的低频雷达增强成像

2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama) Pub Date : 2018-08-01 DOI: 10.23919/PIERS.2018.8597817

Yongpeng Dai, T. Jin, Yongping Song, Hao Du, Dizhi Zhao

引用次数: 14

A Novel 1–6 GHz Chaotic Signal Oscillator for Broadband Communication Systems 一种用于宽带通信系统的1 - 6ghz混沌信号振荡器

2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama) Pub Date : 2018-08-01 DOI: 10.23919/PIERS.2018.8598177

Shanwen Hu, Shu Yu, Yunqing Hu, Zixuan Wang, Bo Zhou

{"title":"A Novel 1–6 GHz Chaotic Signal Oscillator for Broadband Communication Systems","authors":"Shanwen Hu, Shu Yu, Yunqing Hu, Zixuan Wang, Bo Zhou","doi":"10.23919/PIERS.2018.8598177","DOIUrl":"https://doi.org/10.23919/PIERS.2018.8598177","url":null,"abstract":"In this paper, a novel Colpitts type chaotic oscillator with dual tuning inductor is presented. The oscillator is based on a single stage common-emitter structure, two tuning inductors are adopted at collector and emitter terminal to tune bandwidth and signal stability of the proposed chaotic oscillator. The inductor on collector is used to compensate high frequency signal degradation caused by the Miller capacitance CBC. The inductor on emitter is used to balance the signal stability over the whole wide operation bandwidth. Based on above techniques, a broadband chaotic oscillator with over 1–6 GHz operation frequency range is derived and presented. To demonstrate the bandwidth tuning principle proposed in this paper, a single stage chaotic oscillator circuit is designed and manufactured on FR4 substrate. A commercial wideband NPN transistor BFG520 is used to amplify and generate signal. The cut-off frequency of this transistor BFG520 is 9 GHz. The circuit is ultra-compact with only 2.54 × 2.54 cm2 area. Measurement results show that this chaotic oscillator has stable oscillation state with ±400 mV maximum voltage amplitude, the fundamental frequency fo is 1 GHz, and the chaotic signal bandwidth is over 1–6 GHz.","PeriodicalId":355217,"journal":{"name":"2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125809011","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: 7

A Method of Path Sharing for Multiple VDIF Data Streams Transmission 多VDIF数据流传输的路径共享方法

2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama) Pub Date : 2018-08-01 DOI: 10.23919/PIERS.2018.8598165

Ren-Jie Zhu

{"title":"A Method of Path Sharing for Multiple VDIF Data Streams Transmission","authors":"Ren-Jie Zhu","doi":"10.23919/PIERS.2018.8598165","DOIUrl":"https://doi.org/10.23919/PIERS.2018.8598165","url":null,"abstract":"One unit of the VLBI digital backend, CDAS2-PFB, can deal with the signal coming from one RF band with two different polarization, such as left-hand circular polarization (LHCP) and right-hand circular polarization (RHCP), or horizontal polarization (HPOL) and vertical polarization (VPOL). The processing results of each polarization comes out from two different 10-Gigabit Ethernet (10GE) ports and sent to different recorders. In the VLBI Global Observation System (VGOS) stations, since there are four RF bands, four CDAS2-PFB units needed to be installed and eight data streams will be produced. While the recorder named Mark6 in VGOS station, have only four 10GE ports for data transferring, eight data streams need to be connected to the recorder. A method based on time division multiplexing technology has been designed to sharing one output port with two data streams in each CDAS2-PFB unit. In the design, a dedicated format named VLBI Data Interchange Format (VDIF) has been chosen to framed the data coming from different polarization. Each data stream can be identified by the value of specific field in the VDIF frame header after recorded in disks. And a switching module has been designed by two nested state machines, one for port switching and the other for interface controlling. It will be convenient to upgrade the switching module if the number of data streams increasing. The design has been verified in FPGA and merged to the original firmware of CDAS2-PFB. Furthermore, the relationship between the data rate of the input streams and the maximum transmission capability of the output path have also been discussed in order to show the conditions that the method is suitable for the application.","PeriodicalId":355217,"journal":{"name":"2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114142293","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

Parity-Time Symmetric Laser and Absorber 奇偶时间对称激光器与吸收体

2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama) Pub Date : 2018-08-01 DOI: 10.23919/PIERS.2018.8597972

Z. Wong

引用次数: 0