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   store and forward communication payload design for leo satellite systems  
نویسنده abbasi-moghadam dariush ,hoseini-nasab hotkani mehdi ,abolghasemi mojtaba
منبع majlesi journal of electrical engineering - 2016 - دوره : 10 - شماره : 3 - صفحه:1 -11
چکیده    this paper presents the design and implementation of store and forward (s&f) communication payload for sina-1satellite. the s&f subsystem uses vhf and uhf radio links for receiving and transmitting messages. the mainpurpose of the system is to provide the handling of transmitting/receiving of packet type messages via satellite. amessage from one ground terminal is stored in satellite on-board memory and delivered as the satellite passes over thedestination ground terminal. the two ground terminals do not have to see the satellite at the same time, and a singlesatellite can provide global communications coverage. the main specifications of store and forward subsystem arecalculated and presented. data transmission on downlink is performed in time division multiplex (tdm) mode.multiple access to receiving channel of on-board transceiver (uplink) is performed according to split channelreservation multiple access (srma) protocol. the effect of different parameters such as the number of users, packetlength and visibility time is analyzed. phase shift keying (psk) modulation is used for downlink and uplinktransmissions. in order to enhance the performance of satellite communications link, error correction technique is usedin this payload. link calculation reveals that a packet service of 4.8 kbps can be provided without satellite trackingmechanisms. finally the structure of the on-board s&f transceiver is presented.
کلیدواژه sina-1 ,leo satellite ,data transmission system ,transceiver ,srma
آدرس shahid bahonar university of kerman, electrical engineering dept., iran, amirkabir university, electrical engineering dept., iran, malek ashtar university, electrical engineering dept., iran
پست الکترونیکی mo_abolghasemi@mut.ac.ir

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