Os satélites são críticos para que o setor de IoT atinja todo seu potencial 09-06-2017
- by Antonio Junior P. Souza
- 1 comment
- 1 participant
Dalam dunia telekomunikasi satelit merupakan suatu perangkat yang sangat penting dan vital. Satelit dapat mengcover area yang cukup luas. Dalam prakteknya untuk menerima atau mengirim data ke sebuah satelit dibutuhkanlah sebuah antena,... more
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Dalam dunia telekomunikasi satelit merupakan suatu perangkat
yang sangat penting dan vital. Satelit dapat mengcover area yang
cukup luas. Dalam prakteknya untuk menerima atau mengirim data
ke sebuah satelit dibutuhkanlah sebuah antena, agar sinyal dikirim
atau diterima dapat berjalan lancar diperlukan tindakan pointing
antena atau mengarahkan antena ke sebuah satelit yang diinginkan
dengan tepan serta presisi. Dalam proses pointing antena diperlukan
beberapa parameter penting, yaitu Azimuth dan Elevation.
Parameter ini dapat kita hitung secara manual namun sangatlah
susah dan kompleks. Untuk mempermudah penentuan nilai Azimuth
dan Elevation perlu dibuat sebuah program komputer yang praktis
dan mudah digunakan.
Kata Kunci : Satelit, Pointing, Antena, Elevation, Azimuth
yang sangat penting dan vital. Satelit dapat mengcover area yang
cukup luas. Dalam prakteknya untuk menerima atau mengirim data
ke sebuah satelit dibutuhkanlah sebuah antena, agar sinyal dikirim
atau diterima dapat berjalan lancar diperlukan tindakan pointing
antena atau mengarahkan antena ke sebuah satelit yang diinginkan
dengan tepan serta presisi. Dalam proses pointing antena diperlukan
beberapa parameter penting, yaitu Azimuth dan Elevation.
Parameter ini dapat kita hitung secara manual namun sangatlah
susah dan kompleks. Untuk mempermudah penentuan nilai Azimuth
dan Elevation perlu dibuat sebuah program komputer yang praktis
dan mudah digunakan.
Kata Kunci : Satelit, Pointing, Antena, Elevation, Azimuth
- by dwi soltan wicaksono
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Anda adalah penggemar alat komunikasi radio dua arah keluaran merk Baofeng? Merk pabrikan Cina ini memang menjadi primadona bagi para pengguna HT baik untuk kegiatan event indoor/outdoor hingga digunakan untuk di lapangan dan alam bebas... more
Anda adalah penggemar alat komunikasi radio dua arah keluaran merk Baofeng? Merk pabrikan Cina ini memang menjadi primadona bagi para pengguna HT baik untuk kegiatan event indoor/outdoor hingga digunakan untuk di lapangan dan alam bebas sebagai alat komunikasi jara k dekat yang memiliki kualitas tidak kalah dengan buatan Jepang. Selain karena kualitasnya sudah cukup baik, harganya pun bisa jauh lebih murah makanya banyak yang cari HT Baofeng ketimbang merk lainya. Baofeng pun terus memperbarui produk keluarannya agar makin bisa memenuhi kebutuhan konsumennya. Seperti yang terlihat dari Baofeng seri UV-05RC ini yang merupakan pengembangan dari produk seri UV-5 sebelumnya. Ada beberapa hal yang membedakannya dengan produk generasi sebelumnya baik dari segi desain body maupun dari segi spesifikasinya. Penasaran dengan fitur apa saja yang jadi senjata HT Baofeng UV-5RC ini? Simak ulasan berikut ini. Sama seperti seri Baofeng UV-5 lainnya, UV-5RC ini adalah HT dengan fitur dual band yang bisa menggunakan dua jenis frekuensi sesuai dengan kebutuhan Anda yaitu VHF atau U HF. Dengan demikian HT ini bisa digunakan di dalam berbagai macam situasi baik ketika digunakan untuk di dalam kota atau di dalam gedung, atau bisa digunakan ketika berpetualang di alam bebas. Berguna juga untuk digunakan dalam misi penyelamatan, patroli hutan, konvoy atau touring, dan sebagainya. Fitur HT Baofeng UV-5RC lain yang tidak kalah menariknya adalah ia sudah dilengkapi dengan LCD display yang memudahkan Anda untuk mengatur settingan yang diinginkan, dengan 3 pilihan warna yang bisa dipilih sesuai kenyamanan mata pengguna. Secara lengkapnya, berikut adalah spesifikasi teknis HT ini: • Frequency Range: 136-174 / 400-520 MHz • Dual-Band Display, Dual Freq. Display, Dual-Standby • Output Power: 5 Watts max • 128 Channels • 50 CTCSS and 104 CDCSS • Built-in VOX Function • 1750Hz Burst Tone • FM Radio Receiver (65.0MHz-108.0MHz) • LED Flashlight • LCD Display dengan 3 pilihan warna • High / Low RF Power • Wide/ Narrow FM mode: 25KHz/ 12.5KHz • Emergency Alert • Low Battery Alert • Battery Saver • Time-out Timer • Keypad Lock • Channel Step: 2.5/ 5/ 6.25/ 10/ 12.5/ 25KHz • ROGER Beep • Channel bisa diberi nama melalui kabel>•
This paper proposes a new procedure in order to improve the performance of block matching and 3-D filtering (BM3D) image denoising algorithm. It is demonstrated that it is possible to achieve a better performance than that of BM3D... more
This paper proposes a new procedure in order to improve the performance of block matching and 3-D filtering (BM3D) image denoising algorithm. It is demonstrated that it is possible to achieve a better performance than that of BM3D algorithm in a variety of noise levels. This method changes BM3D algorithm parameter values according to noise level, removes prefiltering, which is used in high noise level; therefore Peak Signal-to-Noise Ratio (PSNR) and visual quality get improved, and BM3D complexities and processing time are reduced. This improved BM3D algorithm is extended and used to denoise satellite and color filter array (CFA) images. Output results show that the performance has upgraded in comparison with current methods of denoising satellite and CFA images. In this regard this algorithm is compared with Adaptive PCA algorithm, that has led to superior performance for denoising CFA images, on the subject of PSNR and visual quality. Also the processing time has decreased significantly. KEYWORDS Image denoising, improved BM3D, maximum d-distance, satellite image denoising, CFA image denoising.
- by International Journal of Information Science & techniques J
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The VSAT LINK analysis is done for calculating link margin analysis using turbo-c program. This article describes various parameters such as satellite name and transmission and reception parameters and the total link analysis. This... more
The VSAT LINK analysis is done for calculating link margin analysis using turbo-c program. This article describes various parameters such as satellite name and transmission and reception parameters and the total link analysis. This particular VSAT is used in AIRDEFENCE applications. I. INTRODUCTION Link margin calculation is an important for the best use of receiving signals from satellites which are in GEO SYNCHRONOUS orbits. In this paper the TX and RX parameters, and satellite parameters are described and link margin is calculated by hand calculation and also a turbo –c program is executed for calculation of C/N (CARRIER TO NOISE) up link and down link AND Eb/No is also calculated. Also the following is the new VSAT LINK DESIGN CALCULATION FOR L-BAND communication.
- by IJIRAE - International Journal of Innovative Research in Advanced Engineering
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This article describes a missile telemetry data link calculation analysed by executing matlab program. A missile of a length of 9 meters and a Launchpad of a height of 30 meters having a telemetry data link to a receiver at a distance of... more
This article describes a missile telemetry data link calculation analysed by executing matlab program. A missile of a length of 9 meters and a Launchpad of a height of 30 meters having a telemetry data link to a receiver at a distance of 30 to 150 meters.(MOVING OR MOBILE ') The field strength is calculated by using matlab program using FRIIS Transmission formula and Empirical Loss models of propagation loss and polarization mis match loss and cable attenuation and reflection coefficient of both Transmitter and Receiver. The loss model taken is SAKAGAMI MODEL.
- by IJIRAE - International Journal of Innovative Research in Advanced Engineering
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![Ditinjau Ditinjau](http://www.wowkeren.com/images/news/00047710.jpg)
- by Armando Marques-Guedes
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- 115
VSAT (Very Small Aperture Terminal) dapat diartikan sebagai suatu terminal pemancar dan penerima transmisi satelit yang tersebar di banyak lokasi dan terhubung ke hub sentral melalui satelit dengan menggunakan antena parabola berdiameter... more
VSAT (Very Small Aperture Terminal) dapat diartikan sebagai suatu terminal pemancar dan penerima transmisi satelit yang tersebar di banyak lokasi dan terhubung ke hub sentral melalui satelit dengan menggunakan antena parabola berdiameter tertentu, di PT Pasifik Satelit Nusantara VSAT yang digunakan berdiameter 1.8 dan 1.2 meter. VSAT tidak dapat men-support link satelit dengan kapasitas yang besar. Namun, VSAT memiliki kelebihan ditinjau dari segi ekonomi. Dengan Arsitektur jaringan VSAT yang terdiri Hub station, Remote station dan satelit. Instalasi VSAT memerlukan pengaturan yang tepat pada perangkat keras yang meliputi perarahan antena (pointing) dan perangkat lunak yang meliputi penentuan bandwith yang dibutuhkan, frekuensi uplink dan downlink, frekuensi transmit dan receive modem,metode multiple akses dan tipe modulasi.
- by Ardhian Yaqin
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Study done on the error correction technique in the communication system so that the transfer of data can be more efficient and accurate
- by Stella Monica
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- by Miguel Angel
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- by ADE IBRAHIM
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- 5
This Impact Report identifies and summarises the diverse impacts, resulting from the £500m of UK funding of Science and Technology in 2013, using numerous quantitative metrics and short case study extracts. It shows how the varied... more
This Impact Report identifies and summarises the diverse impacts, resulting from the £500m of UK funding of Science and Technology in 2013, using numerous quantitative metrics and short case study extracts. It shows how the varied impacts of a national science and technology organization and its many funded programmes can be annually identified, captured, tracked, and summarised in a public document.
The report was produced for, and by, the Science and Technology Facilities Council (STFC) - the UK Research Council responsible for funding: (1) all UK astronomy, particle and nuclear physics research, (2) related UK science and technology facilities (e.g. as Harwell and Daresbury), (3) the UK contribution to international science (e.g. CERN, international telescopes and space missions), (4) innovation and business spin-off programmes, and (5) UK public engagement activities.
The Report was co-researched and co-authored by the STFC Impact Team, including myself while Impact Evaluation Manager in 2013, with Dr. Claire Dougan-McCallie (lead author/Head of Impact) and Jenny Beard, with additional input from senior managers, and many data and case study contributions from other key managers across STFC.
Varied key impacts are identified and reported including:
• Research amongst the best (by citation impact) in astronomy, nuclear and particle physics.
• Supported research of 226 Principal Investigators in 70 universities, led to 1,100 peer-reviewed papers in 2012.
• Facilities (the Diamond Light Source, ISIS and CLF) were used in 2012/13 by over 4,200 unique users , in over 2,400 experiments, producing over 1,000 papers in peer-reviewed journals.
• Technology from CERN benefited the UK economy by over £100 billion every year.
• Funding the development of the UK’s space, internet and computer animation industries, returned over £500 billion to the UK economy per annum.
• Funded Innovation Campuses hosted over 230 enterprises and supported over 5,000 jobs.
• UK industry won £43 million in contracts from the international subscriptions funded, and had accumulated a total of £150 million since 2005.
• Funded research inspired future generations to study STEM subjects, attracting 90% of UK undergraduates to study physics, funded 782 PhD students and 16,800 student training days.
• Between 2009 to 2012 public engagement programmes engaged people on 58 million occasions, with 2 million people engaged in face-to-face activities in 2013 alone.
The report was produced for, and by, the Science and Technology Facilities Council (STFC) - the UK Research Council responsible for funding: (1) all UK astronomy, particle and nuclear physics research, (2) related UK science and technology facilities (e.g. as Harwell and Daresbury), (3) the UK contribution to international science (e.g. CERN, international telescopes and space missions), (4) innovation and business spin-off programmes, and (5) UK public engagement activities.
The Report was co-researched and co-authored by the STFC Impact Team, including myself while Impact Evaluation Manager in 2013, with Dr. Claire Dougan-McCallie (lead author/Head of Impact) and Jenny Beard, with additional input from senior managers, and many data and case study contributions from other key managers across STFC.
Varied key impacts are identified and reported including:
• Research amongst the best (by citation impact) in astronomy, nuclear and particle physics.
• Supported research of 226 Principal Investigators in 70 universities, led to 1,100 peer-reviewed papers in 2012.
• Facilities (the Diamond Light Source, ISIS and CLF) were used in 2012/13 by over 4,200 unique users , in over 2,400 experiments, producing over 1,000 papers in peer-reviewed journals.
• Technology from CERN benefited the UK economy by over £100 billion every year.
• Funding the development of the UK’s space, internet and computer animation industries, returned over £500 billion to the UK economy per annum.
• Funded Innovation Campuses hosted over 230 enterprises and supported over 5,000 jobs.
• UK industry won £43 million in contracts from the international subscriptions funded, and had accumulated a total of £150 million since 2005.
• Funded research inspired future generations to study STEM subjects, attracting 90% of UK undergraduates to study physics, funded 782 PhD students and 16,800 student training days.
• Between 2009 to 2012 public engagement programmes engaged people on 58 million occasions, with 2 million people engaged in face-to-face activities in 2013 alone.
- by Trevor Wren BSc MA MPhil PhD MBA
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This research was funded by, and implemented within, a UK national research organisation, while the author was the Impact Evaluation Manager responsible for assessing impact on a £15m UK government-funded research programme. This work... more
This research was funded by, and implemented within, a UK national research organisation, while the author was the Impact Evaluation Manager responsible for assessing impact on a £15m UK government-funded research programme.
This work was also submitted as the authors MBA dissertation which was accepted and awarded in 2009.
ABSTRACT: A methodology and methods ‘toolbox’ is proposed for conducting impact research and assessment from within research programmes. The emphasis is upon how to clarify and assess the wider impacts from the early stages onwards.
The approach explicitly acknowledges, and attempts to address, the known issues and challenges of impact assessment while drawing upon the resources and opportunities available to research managers and researchers within such programmes.
The study has two triangulating foundations. Firstly, it examines the academic literature to help identify and design the pilot methodology and methods. Secondly it trials these in a real programme to both test and improve them.
The study was conducted over one year within one leading UK research organisation, where two research programmes (and around 60 research projects of £15m total value) were being assessed for their impacts. The study draws upon actual impact management experience and reflection, prospective (ex ante) and retrospective (ex post) assessments, participatory contributions from leading researchers undergoing assessment, and consultation with external users. The findings of this study outline the pilot and its first iteration. Recommendations are made for improvement to the methodology and methods.
A subsequent follow-on bid to UK government incorporating the impacts identified from implementing this methodology, successfully led to a further £15m of government funding.
It is expected the pilot methodology and methods will be applicable to other organisations, conducting and funding such research programmes, required to research and assess the wider research impacts.
Although primary focus of implemetation trials was upon research in physical sciences, technology, high-tech engineering, computing/IT, and environment, the wider literature study, the methodology design and justification, the methods proposed and used, and the resulting general recommendations and lessons are expected to apply more broadly to many other research areas, where the impact is to be found more widely in the society, economy, government or public sector or within organizations, policies, professions or the public.
Interest in this work is expected from research programme managers, impact managers and assessors, management consultants advising in this area, and government funding managers, all seeking to embed a developing approach to understand, capture, and enhance wider impact.
This work was also submitted as the authors MBA dissertation which was accepted and awarded in 2009.
ABSTRACT: A methodology and methods ‘toolbox’ is proposed for conducting impact research and assessment from within research programmes. The emphasis is upon how to clarify and assess the wider impacts from the early stages onwards.
The approach explicitly acknowledges, and attempts to address, the known issues and challenges of impact assessment while drawing upon the resources and opportunities available to research managers and researchers within such programmes.
The study has two triangulating foundations. Firstly, it examines the academic literature to help identify and design the pilot methodology and methods. Secondly it trials these in a real programme to both test and improve them.
The study was conducted over one year within one leading UK research organisation, where two research programmes (and around 60 research projects of £15m total value) were being assessed for their impacts. The study draws upon actual impact management experience and reflection, prospective (ex ante) and retrospective (ex post) assessments, participatory contributions from leading researchers undergoing assessment, and consultation with external users. The findings of this study outline the pilot and its first iteration. Recommendations are made for improvement to the methodology and methods.
A subsequent follow-on bid to UK government incorporating the impacts identified from implementing this methodology, successfully led to a further £15m of government funding.
It is expected the pilot methodology and methods will be applicable to other organisations, conducting and funding such research programmes, required to research and assess the wider research impacts.
Although primary focus of implemetation trials was upon research in physical sciences, technology, high-tech engineering, computing/IT, and environment, the wider literature study, the methodology design and justification, the methods proposed and used, and the resulting general recommendations and lessons are expected to apply more broadly to many other research areas, where the impact is to be found more widely in the society, economy, government or public sector or within organizations, policies, professions or the public.
Interest in this work is expected from research programme managers, impact managers and assessors, management consultants advising in this area, and government funding managers, all seeking to embed a developing approach to understand, capture, and enhance wider impact.
- by Trevor Wren BSc MA MPhil PhD MBA
- •
The signal power is radiated into a substantial angular region of atmosphere by the transmitting antenna and only a small fraction is intercepted by the receiving antenna. The proper knowledge of antenna is essential for the communication... more
The signal power is radiated into a substantial angular region of atmosphere by the transmitting antenna and only a small fraction is intercepted by the receiving antenna. The proper knowledge of antenna is essential for the communication scientists to evaluate the performance of a communication system. The satellite communication experts need to be able to launch radio quanta over a very limited range of frequencies and hence quantum energies. In some cases they wish to launch the quanta particularly in a certain direction, towards a known location where they are to be received. They do all these things by means of a structure called an antenna.
Antennas are devices used either for the emission or for the reception of radio quanta. An emitting antenna is a device supplied by an electric power generated at a certain frequency and radiation of waves in space. According to several different physical mechanisms observed for the propagation of radio waves that are given below: free space propagation or line of sight propagation, reflection, transmission, diffraction, scattering and wave guiding.
In this communication, the types of satellite antennas for emitting and receiving power have been discussed that depend on their intended use as well as on the frequency and they include (i) Horn antennas (ii) paraboloid reflector etc. Some parametric characteristics such as (i) radiation patterns (ii) the power gain (iii) the directivity (iv) the beam width (v) the aperture (vi) the polarization (vii) their impedance with their model equations are also mentioned. The modeling of beam widths with aperture ratio effects and fluctuations have been illustrated.
Antennas are devices used either for the emission or for the reception of radio quanta. An emitting antenna is a device supplied by an electric power generated at a certain frequency and radiation of waves in space. According to several different physical mechanisms observed for the propagation of radio waves that are given below: free space propagation or line of sight propagation, reflection, transmission, diffraction, scattering and wave guiding.
In this communication, the types of satellite antennas for emitting and receiving power have been discussed that depend on their intended use as well as on the frequency and they include (i) Horn antennas (ii) paraboloid reflector etc. Some parametric characteristics such as (i) radiation patterns (ii) the power gain (iii) the directivity (iv) the beam width (v) the aperture (vi) the polarization (vii) their impedance with their model equations are also mentioned. The modeling of beam widths with aperture ratio effects and fluctuations have been illustrated.
![Channel Sedang Ditinjau Channel Sedang Ditinjau](/uploads/1/2/5/6/125683454/525660970.png)
- by Faisal Afridi
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