发布求助
文献互助 智能选刊 最新文献

2009 International Conference on Space Science and Communication最新文献

筛选
英文 中文
Satellite link margin prediction and performance of ASTRO Malaysia 马来西亚ASTRO的卫星链路余量预测和性能
2009 International Conference on Space Science and Communication Pub Date : 2009-12-15 DOI: 10.1109/ICONSPACE.2009.5352666
K. A. Rahim, M. Ismail, M. Abdullah
{"title":"Satellite link margin prediction and performance of ASTRO Malaysia","authors":"K. A. Rahim, M. Ismail, M. Abdullah","doi":"10.1109/ICONSPACE.2009.5352666","DOIUrl":"https://doi.org/10.1109/ICONSPACE.2009.5352666","url":null,"abstract":"The link performance prediction is important to ensure sufficient customer link margin and transmission availability. In this paper, a link budget prediction tool for analyzing and comparing predicted and measured C/N and Eb/N0 using a typical link margin and transmission availability been developed using Matlab. A study was conducted in ASTRO's uplink station facility in Cyberjaya on 13.2 m and 0.6 m downlink antenna. It was shown that the C/N and Eb/N0 measured value for both antennas were about ± 3 dB as compared to predicted values. The link margin for both values was found sufficient in the worst case condition due to signal attenuation. For 13.2 m antenna, C/N's link margin is 12 dB and Eb/N0's link margin is 8.1 dB while for 0.6 m, C/N's link margin is 3.5 dB and Eb{/N{in0's link margin is 5.8 dB. The total transmission availability conforms to the standard which was promised to their customer with more than 99.7% availability.","PeriodicalId":360685,"journal":{"name":"2009 International Conference on Space Science and Communication","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127450930","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
Conjugate aurora: A case study of westward traveling surge 共轭极光:西行浪涌的个案研究
2009 International Conference on Space Science and Communication Pub Date : 2009-12-15 DOI: 10.1109/ICONSPACE.2009.5352683
N. Sato, H. Doi
{"title":"Conjugate aurora: A case study of westward traveling surge","authors":"N. Sato, H. Doi","doi":"10.1109/ICONSPACE.2009.5352683","DOIUrl":"https://doi.org/10.1109/ICONSPACE.2009.5352683","url":null,"abstract":"We report on spatial and temporal conjugacy of meso-scale (∼10–200 km) westward traveling surge auroras that were simultaneously acquired with all-sky TV cameras situated at two geomagnetically conjugate points, at Raufarhofn in Iceland and at Syowa Station in Antarctica on 30 September 2000. During this event, dynamic features of WTS for westward traveling, meso-scale vortex and curl structure and small-scale ray structure, latitudinal location of surge front of WTS showed good conjugacy. On the other hand, longitudinal displacement of surge front between Syowa and Raufarhofn was 570 km, and westward traveling speed is about 1.4 km/sec in the southern hemisphere but it is about 0.8 km/sec in the northern hemisphere.","PeriodicalId":360685,"journal":{"name":"2009 International Conference on Space Science and Communication","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133715200","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
The Sun and Earth's space environment 太阳和地球的空间环境
2009 International Conference on Space Science and Communication Pub Date : 2009-12-15 DOI: 10.1109/ICONSPACE.2009.5352679
N. Gopalswamy
{"title":"The Sun and Earth's space environment","authors":"N. Gopalswamy","doi":"10.1109/ICONSPACE.2009.5352679","DOIUrl":"https://doi.org/10.1109/ICONSPACE.2009.5352679","url":null,"abstract":"Earth's space environment is closely controlled by solar variability over various time scales. Solar variability is characterized by its output in the form of mass and electromagnetic output. Solar mass emission also interacts with mass entering into the heliosphere in the form of cosmic rays and neutral material. This paper provides an overview of how the solar variability affects Earth's space environment.","PeriodicalId":360685,"journal":{"name":"2009 International Conference on Space Science and Communication","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125093958","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: 6
Chemical characterization of atmospheric transported polycyclic aromatic hydrocarbons in peninsular Malaysia: A quarter century view 马来西亚半岛大气输送多环芳烃的化学特征:四分之一世纪的观点
2009 International Conference on Space Science and Communication Pub Date : 2009-12-15 DOI: 10.1109/ICONSPACE.2009.5352640
M. Sakari, C. Mohamed, M. Zakaria
{"title":"Chemical characterization of atmospheric transported polycyclic aromatic hydrocarbons in peninsular Malaysia: A quarter century view","authors":"M. Sakari, C. Mohamed, M. Zakaria","doi":"10.1109/ICONSPACE.2009.5352640","DOIUrl":"https://doi.org/10.1109/ICONSPACE.2009.5352640","url":null,"abstract":"Atmosphere has long been known as free way for the transport of particle reactive chemicals far distances. Polycyclic aromatic hydrocarbons (PAHs) are priority pollutants in the environment where anthropogenic sources such as petroleum are studied. Chemical characterization of deposited PAH in peninsular Malaysia showed that compounds resulting from combustion contribute more to atmospherically transported compounds than do un-combusted materials, which usually follow the lateral transport, local oil discharge and in-situ natural production. The composition and characterization of PAH demonstrated a higher abundance of parent compounds than of alkyl substitutes. These include pyrene, benzo(e)pyrene, benzo(a)pyrene and benzo(k)fluorenthene. Parent compounds represent a higher proportion of combusted organic materials as well as of petroleum that transfers via atmospheric movement rather than laterally via, for example, rivers and run-off discharges. Diagnostic chemical ratios of chemical compounds such as phenantherene to antheracene and fluorenthene to pyrene showed that combusted materials are dominant that are transferred by atmosphere movement, either over short or long distances, in the studied area.","PeriodicalId":360685,"journal":{"name":"2009 International Conference on Space Science and Communication","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127571337","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
Three-axis fuzzy variable structure control with an application to micro satellite 三轴模糊变结构控制在微卫星上的应用
2009 International Conference on Space Science and Communication Pub Date : 2009-12-15 DOI: 10.1109/ICONSPACE.2009.5352675
R. Rusli, R. Nagarajan, M. Rahim
{"title":"Three-axis fuzzy variable structure control with an application to micro satellite","authors":"R. Rusli, R. Nagarajan, M. Rahim","doi":"10.1109/ICONSPACE.2009.5352675","DOIUrl":"https://doi.org/10.1109/ICONSPACE.2009.5352675","url":null,"abstract":"This paper presents a hybrid form of three-axis control system with has both Variable Structure Control (VSC) and Fuzzy Logic Control (FLC). This proposed Fuzzy Variable Structure Control (FVSC) approach combines the power of approximate reasoning of FLC with the switching synthesis used in VSC. A model of satellite is used in this work to ensure the application of FVSC to control and stabilize a micro satellite in space. First the proposed scheme is applied to single axis and then extended to three axis control. The simulation results indicate that the FVSC can reduce the response time and the performances with noise also verify that FVSC can stabilize the micro satellite system even subjected to various types of input signal. MATLAB Simulink is employed in this work.","PeriodicalId":360685,"journal":{"name":"2009 International Conference on Space Science and Communication","volume":"140 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132387802","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: 3
Compact multiband VHF antenna for transient radio telescope 用于瞬态射电望远镜的小型多波段甚高频天线
2009 International Conference on Space Science and Communication Pub Date : 2009-12-15 DOI: 10.1109/ICONSPACE.2009.5352641
R. Anwar, N. Misran, M. Islam, G. Gopir
{"title":"Compact multiband VHF antenna for transient radio telescope","authors":"R. Anwar, N. Misran, M. Islam, G. Gopir","doi":"10.1109/ICONSPACE.2009.5352641","DOIUrl":"https://doi.org/10.1109/ICONSPACE.2009.5352641","url":null,"abstract":"Development of antenna for a radio telescope system has become a fascinating research area in the field of radio astronomy. In this paper, a design of compact multiband VHF antenna for a transient radio telescope system is proposed. The multiband has been achieved by combining V-shape half-wavelength dipole, traps and parasitic elements. Return losses of about −12.45 dB, −25.15 dB and −29.42 dB are obtained at three different frequencies, where the maximum gains are achieved at zenith direction for all operating frequencies. The proposed antenna is suitable to be used in a transient radio telescope which is operated in urban centers.","PeriodicalId":360685,"journal":{"name":"2009 International Conference on Space Science and Communication","volume":"199 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115681697","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: 8
Characteristics of equatorial Pc3 pulsations 赤道Pc3脉动的特征
2009 International Conference on Space Science and Communication Pub Date : 2009-12-15 DOI: 10.1109/ICONSPACE.2009.5352676
M. G. Cardinal, K. Yumoto
{"title":"Characteristics of equatorial Pc3 pulsations","authors":"M. G. Cardinal, K. Yumoto","doi":"10.1109/ICONSPACE.2009.5352676","DOIUrl":"https://doi.org/10.1109/ICONSPACE.2009.5352676","url":null,"abstract":"Most Pc3 studies have been done using data from satellites and low-mid-high latitude stations, while Pc3s at equatorial regions have received less attention. The generation and propagation mechanisms of equatorial Pc3 pulsations are not yet well understood. Considering that the Philippines is located in the equatorial region, we studied the characteristics of equatorial Pc3 pulsations in the H component (H) and D component (D) using the data obtained from Circum-pan Pacific Magnetometer Network (CPMN) stations. The results show that equatorial Pc3 amplitudes at Dip latitudes from −0.65° to 6.79° are dependent on local time and season. The dayside Pc3 showed peak amplitude around noontime. Although Pc4 (H) amplitudes at DAV station (Dip latitude = −0.65°) showed the equatorial enhancement, Pc3 (H) amplitudes at DAV did not exhibit such enhancement. Furthermore, DAV's Pc3 (H) showed a lower correlation with the equatorial conductivity and equatorial electrojet when compared with Pc4 (H). Based on these results, we conclude that the equatorial Pc3 must be from the upstream region.","PeriodicalId":360685,"journal":{"name":"2009 International Conference on Space Science and Communication","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129837947","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: 4
Design analysis of compact dual-band microstrip RFID reader antenna 紧凑型双频微带RFID阅读器天线设计分析
2009 International Conference on Space Science and Communication Pub Date : 2009-12-15 DOI: 10.1109/ICONSPACE.2009.5352663
A. Mobashsher, N. Misran, M. Islam
{"title":"Design analysis of compact dual-band microstrip RFID reader antenna","authors":"A. Mobashsher, N. Misran, M. Islam","doi":"10.1109/ICONSPACE.2009.5352663","DOIUrl":"https://doi.org/10.1109/ICONSPACE.2009.5352663","url":null,"abstract":"RFID excelled in automatic identification and data collection industry through its speed, agility and endurance. An analysis of the design of a single-layered microstrip antenna comprising a single patch on the top layer with slots on the radiating edges to obtain dual-band RFID reader operation at free ISM bands of 2.45GHz and 5.8GHz is presented in this letter. The antenna has a compact appearance and with the help of single microstrip feed line the radiating patch has a dimension of 19mm× 29mm. A good impedance bandwidth of 115MHz has been achieved form 2.395GHz to 2.50GHz for the lower band, while the upper band covers 600MHz (from 5.40GHz to 6.00GHz). The proposed antenna shows stable radiation characteristics for the frequencies of interest. Furthermore, an extensive parametric study was performed to realize the relationship between the resonance frequencies in the two bands and different parameters which is helpful for advancement of the antenna design.","PeriodicalId":360685,"journal":{"name":"2009 International Conference on Space Science and Communication","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122716793","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: 17
Variations of ionospheric TEC at geomagnetic conjugate points during solar minimum 太阳极小期地磁共轭点电离层TEC的变化
2009 International Conference on Space Science and Communication Pub Date : 2009-12-15 DOI: 10.1109/ICONSPACE.2009.5352647
S. Bahari, M. Abdullah, B. Yatim
{"title":"Variations of ionospheric TEC at geomagnetic conjugate points during solar minimum","authors":"S. Bahari, M. Abdullah, B. Yatim","doi":"10.1109/ICONSPACE.2009.5352647","DOIUrl":"https://doi.org/10.1109/ICONSPACE.2009.5352647","url":null,"abstract":"We have studied the variations of TEC at quasi-conjugate points using data obtained from GPS receiver at Syowa station, Antarctica (SYOG) (GC: −69.00° S, 39.58° E; CGM: −66.08°S, 71.65 E°), and Árholt station (ARHO), Iceland (high Arctic region) (GC: 66.19° N, 342.89° E; CGM: 66.37°S, 71.48 E°) for a period in 2007, during the minimum phase of solar cycle 23. The GPS measurements of IGS and IMO network were used to create TEC maps. The time resolution of TEC maps is about 1 hour. The TEC maps show that the maximum TEC value over SYOG is at 1000 UT (1300 LT) while in ARHO is at 1300 UT (UT = LT). March 2007, when it was summer in the southern polar region, the TEC value over SYOG range was higher by 3 TECU than ARHO, which was experiencing winter during that time. This has proved the role of sun in the TEC distribution with photoionization process. The measurements of the TEC variation obtained from GPS during different months at both hemispheres showed symmetry in the median TEC at the conjugate points.","PeriodicalId":360685,"journal":{"name":"2009 International Conference on Space Science and Communication","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131731969","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
Customer access protection unit (CAPU) performing auto-restoration in line with access control system (ACS) for FTTH customer's network 用户访问保护单元(CAPU)对FTTH用户网络执行与访问控制系统(ACS)一致的自动恢复
2009 International Conference on Space Science and Communication Pub Date : 2009-12-15 DOI: 10.1109/ICONSPACE.2009.5352665
M. Ab-Rahman, Siti Rahayu Hassan, K. Jumari
{"title":"Customer access protection unit (CAPU) performing auto-restoration in line with access control system (ACS) for FTTH customer's network","authors":"M. Ab-Rahman, Siti Rahayu Hassan, K. Jumari","doi":"10.1109/ICONSPACE.2009.5352665","DOIUrl":"https://doi.org/10.1109/ICONSPACE.2009.5352665","url":null,"abstract":"This paper adresses the implementation of customer access protection unit (CAPU) as an automatic switching device designed as a value-added package offered to customer to perform security and self restoration at their own place. The restoration scheme proposed in this paper was presented and the simulation results had justify the system feasibility. An auto-restoration feature is controlled by Access control System (ACS); another smart unit contributing to intelligent- Fiber to the Home proposed by the research group. ACS will basically activate the switch and detect the fiber cut in the distribution lines. The bit error rate (BER) performances are measured by a 1.25 Gp/s non- return-to zero (NRZ) pseudo random binary sequence (PBRS) with a pattern length of 231-1 for the downstream traffic between OLT and 8 ONUs. Our results were presented as comparisons of eye diagram's characteristics based on the five conditions suggested by the restoration mechanism proposed.","PeriodicalId":360685,"journal":{"name":"2009 International Conference on Space Science and Communication","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115952746","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: 6
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：604180095
Book学术官方微信