• Title/Summary/Keyword: Satellite Link

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Study on the Link Analysis for Satellite Broadcasting Service Using Ka Band Transponders in the Korean Area

  • Yoon, Ki-Chang;Kim, Seung-Chul;Sohn, Won
    • Journal of Satellite, Information and Communications
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    • v.3 no.2
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    • pp.7-12
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    • 2008
  • The study discussed the link analysis for the Ka band satellite broadcasting service in Korea with respect to the transmission schemes based on the DVB-S2 standard. To analyze the effect of the rain fading to the link budget, we estimated the rain attenuation from the measured rainfall intensity in Korea. We analyzed the link budget for the Ka band transponders of Koreasat-3, and DirecTV BSS-99W, and showed the possible link availability with the DVB-S2 transmission schemes for each transponder. Based on the link analysis of the available satellites with the Ka band transponders, we suggested the required EIRP for the satellite which will be employed for the Ka band satellite broadcasting service in Korea.

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A Development of Satellite Communication Link Analysis Tool

  • Ayana, Selewondim Eshetu;Lim, SeongMin;Cho, Dong-Hyun;Kim, Hae-Dong
    • Journal of Astronomy and Space Sciences
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    • v.37 no.2
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    • pp.117-129
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    • 2020
  • In a Satellite communication system, a link budget analysis is the detailed investigation of signal gains and losses moving through a channel from a sender to receiver. It inspects the fading of passed on data signal waves due to the process of spreading or propagation, including transmitter and receiver antenna gains, feeder cables, and related losses. The extent of the proposed tool is to make an effective, efficient, and user-friendly approach to calculate link budget analysis. It is also related to the satellite communication correlation framework by building up a graphical interface link analysis tool utilizing STK® software with the interface of C# programming. It provides better kinds of graphical display techniques, exporting and importing data files, printing link information, access data, azimuth-elevation-range (AER), and simulation is also possible at once. The components of the link budget analysis tool include transmitter gain, effective isotropic radiated power (EIRP), free space loss, propagation loss, frequency Doppler shift, flux density, link margin, elevation plot, etc. This tool can be useful for amateur users (e.g., CubeSat developers in the universities) or nanosat developers who may not know about the RF communication system of the satellite and the orbital mechanics (e.g., orbit propagators) principle used in the satellite link analysis.

ATM cell transmission performance evaluation for co-channel interference in the next generation satellite B-ISDN/ATM networks (차세대 위성 B-ISDN/ATM 망에서 공동채널간섭에 대한 ATM 셀 전송 성능평가)

  • 김병균;김신재;최형진
    • Journal of the Korean Institute of Telematics and Electronics S
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    • v.35S no.3
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    • pp.9-18
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    • 1998
  • For constructionof the next generation satellite B-ISDN/ATM networks considering integration with terrestrial information infrastructure networks, various high speed and wideband satellites with be launched and they will make used of frequency reue techniques for efficient management of limited frequency resource. Therefore, CCI(Co-Channel Interference) inherent in frequency reuse will be a dominant factor in performance degradation of satellite networks. This paper alanyzes the ATM cell transmission performance degradation caused by CCI. The satellite link, including up-link and down-link thermal noise, CCI, and nonlinear satellite transponder, is modeled and interleaving technique is used for compensating the ATM cell transmission performance degradation caused by burst error of satellite link. First, each satellite link subsystem is analyzed in detail and then end-to-end ATM cell transmission performance is evaluated with BER and CLR. Specifically, ATMcell transmission performance degradation caused by CCI is evaluated in detail.

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Link Relay H-ARQ mode for Throughput improvement in a Satellite Communication network (위성통신망에서 Throughput 향상을 위한 Link Relay H-ARQ 방식)

  • Hwang, Lan-Mi;Lee, Byung-Jin;Yeo, Bong-Gu;Cho, Ju-Phil;Kim, Kyung-Seok
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.16 no.1
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    • pp.121-127
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    • 2016
  • Satellite communication is a communication method using a satellite as a repeater communication on the air and have a communication range is wide and is possible to transmit high-speed data, so Satellite communication has been highlighted as the next generation communication. However, because the distance between the ground and the satellite is far away, there is a disadvantage that propagation delay time is very long and packet is damaged. Therefore, this study was applied to Link Relay H-ARQ system in order to complement the damage to the packet. Furthermore, we propose the Modified Link Relay H-ARQ scheme is a new scheme to supplementation the delay time. By applying the Markov channel for implementing a channel of satellite communications, the results of analyzing the performance, when applying the Link Relay HARQ scheme, BER and PER performance was improved, when applying the Modified Link Relay H-ARQ scheme, Throughput performance was confirmed improvement.

Effect of satellite link noise for satellite range measurement using tone method (Tone 방식을 사용한 위성 거리 측정에 대한 위성 링크 잡음의 영향)

  • Kim Young Wan
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.42 no.2 s.332
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    • pp.9-16
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    • 2005
  • The performance of satellite range measurement using tone method was analyzed in the presence of satellite link AWGN. The phase errors in range measurement are generated by AWGN of satellite up- and down-link and the degradations of satellite range measurement are dependent on the transmission mode and loop bandwidth of satellite measurement system. The analyzed effects for satellite measurement in presence of satellite link noise were also analyzed with the measured satellite range data via satellite range measurement system operating in satellite link AWGN. In RAU mode, the satellite range differences of 14.4 to 40.6 m were occurred according to the loop bandwidth of satellite range measurement system and the degradation of 0.3 dB compared with theoretical value was generated under condition of the signal-to-noise ratio of 43 dB. In RAU and TM mode, the performances of range measurement were approximately agreed to the that of RAU mode. In order to get the equal performance characteristics with RAU mode, the signal-to-noise ratio of satellite link for RAU and TM mode should be increased by signal power of 2.3 dB, which is a power loss due to transmission of telemetry signal.

Optimal Design of Superframe Pattern for DVB-RCS Return Link

  • Lee, Ki-Dong;Cho, Yong-Hoon;Lee, Seung-Joon;Lee, Ho-Jin
    • ETRI Journal
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    • v.24 no.3
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    • pp.251-254
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    • 2002
  • We developed a method for optimal superframe design in the multi-frequency time division multiple access (MF-TDMA) return-link of a satellite multimedia interactive network called a digital video broadcasting return channel over satellite (DVB-RCS) sub-network. To find the optimal superframe pattern with the maximum data throughput, we formulated the design problem as a non-linear combinatorial optimization problem. We also devised the proposed simple method so that it would have field applicability for improving radio resource utilization in the MF-TDMA return link.

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A SYSTEM DESIGN AND ANALYSIS FOR SATELLITE COMMUNICATION LINK

  • Chung, Tae-Jin;Eun, Jong-Won
    • Journal of Astronomy and Space Sciences
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    • v.17 no.2
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    • pp.257-266
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    • 2000
  • A satellite RF communication link is analyzed based on a simple fundamental equations by systematic approach in this paper. The number of variables related to a design and analysis of satellite RF link is often a dozen or more, thus it is a tedious and time-consuming task. With the given input data, the important parameters are calculated step by step and three communication characteristics such as communication channel capacity, carrier-to-noise ratio(CNR) at the satellite and ground station are analyzed. It gives very useful information to the system engineers for designing and analyzing the overall satellite communication system in the conceptual design phase.

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Lunar Exploration Satellite Communication Link Analysis (달 탐사 위성의 통신 링크 분석)

  • Kim, Ah-Leum;Lee, Seul-Ki;Lee, Woo-Kyung
    • Journal of Satellite, Information and Communications
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    • v.6 no.1
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    • pp.1-5
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    • 2011
  • In recent space industry, It has become a major trend to launch lunar exploration satellites to extend activities in the deep space environment. In this paper, a link budget analysis is carried out for the lunar exploration satellite. One of the major difference between the lunar satellite and LEO spacecraft lies in the orbit parameters. The vast distance between spacecraft and the Earth station imposes a challenging task for the spacecraft designers in terms of achieving stable communication link budget. The satellite tool kit software has been adopted to simulate the lunar exploring satellite. The relative distance between the spacecraft and the ground stations are tracked and the communication link budget is calculated accordingly.

OVERALL LINK ANALYSIS ON HRIT AND LRIT IN COMS

  • Park Durk-Jong;Hyun Dae-Wan;Kang Chi-Ho;Ahn Sang-Il;Kim Eun-Kyu
    • Proceedings of the KSRS Conference
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    • 2005.10a
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    • pp.98-100
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    • 2005
  • This paper describes link analysis on the processed data, HRIT (High Rate Information Transmission) and LRIT (Low Rate Information Transmission), for the preliminary design of interface between COMS (Communication, Ocean and Meteorological Satellite) and ground station. At the MODAC (MeteorologicaVOcean Data Application Center), the processed data are transmitted to user station via COMS with normalization and calibration by pre-processing of MI (Meteorological Imager) data. Due to consider satellite as radio relay, overall analysis containing uplink and downlink is needed. Specific link parameters can be obtained with using the outcomes of SRR (System Requirement Review) which was held on 13-14 June 2005, in Toulouse. From the relation between overall link margin and output power of HPA (High Power Amplifier) of MODAC, it is shown that even though the minimum power related with COMS receiving power range is transmitted at MODAC, the obtained link margin of HRIT could be above 3 dB at user station which antenna elevation angle is 10 degree.

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The link performance analysis of the satellite communications system using satellite network simulator (모의위성망을 활용한 위성통신체계의 링크성능 분석)

  • Jang, Jae-Woong
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.32 no.5A
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    • pp.441-450
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    • 2007
  • In this paper, it is proposed the link performance analysis results using SNRAT(Satellite Network Resource Allocation & Analysis Tool) and verified the anticipated results by satellite communication network simulator. A communication satellite cannot be corrected or fixed for the error in orbit operation after launching unlike the ground operation equipment and has a restricted operation life. So, it is important to make possible to use satellite communications in the proper time. It is expected the link BER(Bit Error Rate), throughput and AJ(Anti-Jamming) performance using SNRAT tool before launching. And it is verified the performance of the repeaters and ground equipment specification using the satellite network simulator and is extracted the optimum operational scenarios through the tests of various network operational plans.