Subjects: Geosciences >> Space Physics submitted time 2016-04-22
Abstract： For the small satellites formation flying， the distance between satellites must be determined and an adequate inter-satellites communication medium must be used to transmit the science data. In order to minimize device complexity， this paper studied a system capable of simultaneously transmitting high rate telecommunication and ranging. through simulations by Simulink in different ranging modulation index， obtained the bit error rate of telecommunication data. By analyzing the characteristics of GMSK+PN signal， an effective demodulation scheme for GMSK+PN is developed by this paper.
Peer Review Status:
Awaiting Review
Subjects: Geosciences >> Space Physics submitted time 2016-04-22
Abstract： In order to save channel resources， asynchronous digital multiplexer， which can multiplex different rate， different burst time slot digital source， has been widely applied. Aims to reduce the maximum extent possible source packet data transmission delay， improve channel utilization， design scheme of a greedy asynchronous dynamic digital multiplexer is proposed. The priority scheduling strategy of sources is given too. Two kinds of multiplex model are described by hardware description language. Simulations for greedy dynamic multiplexer and virtual channel multiplexer， under the condition of different physical frame length and two source model， have been carried out by Modelsim. The simulation results show that， for the average transmission delay and delay jitter， the greedy dynamic multiplexing is superior to the virtual channel multiplexing， and is more effective in saving resource of source cache.
Peer Review Status:Awaiting Review
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