On-Frequency Gap-Filler using Adaptive Tracking Null Controller for Next Generation Mobile Satellite Communication Systems

Yoshida, Tomihiko; Kobayashi, Kiyoshi; Ohata, Kohei; Ueba, Masazumi

doi:10.1109/pimrc.2005.1651847

Cited by 5 publications

(2 citation statements)

References 5 publications

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“…Antena yang digunakan pada FSS umumnya berdiameter besar, karena itulah pointing antena harus menyamai keakuratan dari fixed earth stations [2]. Dimana ketepatannya, sesuai dengan aturan ITU-R, haruslah berkisar 02 derajat dari titik pointing puncaknya [3].…”

Section: Pendahuluanunclassified

Rancang Bangun Perangkat Lunak Sistem Auto Tracking Satellite Antenna Mobile Menggunakan Metode Azimut-Elevasi Dan Koreksi Modem

Sirat¹,

Asvial²,

Diponegoro³

et al. 2010

MST

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AbstrakKeakuratan pointing merupakan hal penting dalam komunikasi satelit. Akibat jarak satelit dengan permukaan bumi yang sedemikian jauh, maka selisih pointing 1 derajat dapat menyebabkan antena tidak dapat mengirimkan data ke satelit. Untuk mengatasi hal ini dibuatlah kontroler auto-tracking satelit. Sistem ini menggunakan mikrokontroler sebagai pengontrol, global positioning system (GPS) sebagai input lokasi dari antena, digital compass sebagai input arah pointing awal antena, rotari enkoder sebagai sensor pergerakkan azimut dan elevasi, serta modem untuk melihat besar Eb/No sinyal. Kontroler ini menggunakan dua tahapan dalam proses tracking satelit. Tahapan awal ialah metode elevasi-azimut dengan menggunakan masukkan dari GPS, digital compass, serta posisi satelit (baik koordinat, maupun ketinggiannya) yang tersimpan dalam mikrokontroler. Kontroler menghitung besar sudut azimut dan elevasi antena terhadap satelit, kemudian menggerakkan antena sesuai dengan sudut azimut dan elevasinya. Tahapan selanjutnya ialah koreksi modem dimana pada tahapan ini hanya masukan modem yang digunakan (keempat masukan lain diabaikan), dan pergerakkan antena diatur hingga didapat nilai Eb/No sinyal yang terbesar. Berdasarkan hasil pengoperasian kontroler, terjadi perubahan nilai pada input level dari semula -81,7 dB menjadi -30,2 dB dengan nilai Eb/No akhir sebesar 5,7 dB. AbstractSoftware Design of Mobile Antenna for Auto Satellite Tracking Using Modem Correction and Elevation Azimuth Method. Pointing accuracy is important in satellite communication. Because the satellite's distance to the surface of the earth's satellite is so huge, 1 degree of pointing error will make the antenna unable to send data to satellites. To overcome this, the auto-tracking satellite controller is made. This system uses a microcontroller as the controller, with the GPS as the location indicator of the antenna, a digital compass as the beginning of antenna pointing direction, a rotary encoder as azimuth and elevation censor, and a modem to see Eb/No signal. The microcontroller uses serial communication to read the input. Thus, the programming should be focused on the Universal Asynchronous Receiver/Transmitter (UART) and serial communication software UART. This controller has 2 phases in the process of tracking satellites. The early stage is the elevation-azimuth method, in which with input from the GPS and digital compass, the position of satellites (both coordinates and height) is stored in the microcontroller. The controller will measure the elevation and azimuth angle, then it will move the antenna according to the antenna azimuth and elevation angle. The next stage is correction modem, in which the controller only uses the modem as the input, and antenna movement is set up to obtain the largest value of Eb/No signal. The results of the controller operation show that there is a change in the value of the original input level from -81.7 dB to -30.2 dB with end of Eb/No value reaching 5.7 dB.

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Section: Pendahuluanunclassified

Rancang Bangun Perangkat Lunak Sistem Auto Tracking Satellite Antenna Mobile Menggunakan Metode Azimut-Elevasi Dan Koreksi Modem

Sirat¹,

Asvial²,

Diponegoro³

et al. 2010

MST

View full text Add to dashboard Cite

show abstract

“…Excessive feedback from the transmitting antenna to the receiving antenna causes magnitude and phase errors in the repeated signal and may even cause the repeater to experience oscillation [4–6]. The simplest solution for improving the isolation is to increase the physical distance between the receiving and transmitting antennas [7–11]. However, it is important to understand how to restrain the coupling in compact repeater systems due to physical size limitations of the pillar supporting the antenna in the repeater system.…”

Section: Introductionmentioning

confidence: 99%

Design of an indoor repeater antenna with high isolation using metamaterials

Lee

Choi

2012

Micro & Optical Tech Letters

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In this article, an innovative indoor repeater antenna with high isolation is proposed. The necessary impedance bandwidth is obtained using the coupling between the main and parasitic patches. A high isolation between transmitting and receiving antennas is achieved using metamaterial. The fabricated indoor repeater antenna has a VSWR less than 1.5, a gain higher than 9.6 dBi, and an isolation between the transmitting and receiving antennas greater than 80 dB over the WiBro band from 2.3 to 2.5 GHz. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:755–761, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26651

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High isolation transmitter and receiver antennas using high-impedance surfaces for repeater applications

Kang

Lim

2013

Journal of Electromagnetic Waves and Applications

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On-Frequency Gap-Filler using Adaptive Tracking Null Controller for Next Generation Mobile Satellite Communication Systems

Cited by 5 publications

References 5 publications

Rancang Bangun Perangkat Lunak Sistem Auto Tracking Satellite Antenna Mobile Menggunakan Metode Azimut-Elevasi Dan Koreksi Modem

Rancang Bangun Perangkat Lunak Sistem Auto Tracking Satellite Antenna Mobile Menggunakan Metode Azimut-Elevasi Dan Koreksi Modem

Design of an indoor repeater antenna with high isolation using metamaterials

High isolation transmitter and receiver antennas using high-impedance surfaces for repeater applications

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