A study on system and link budget of location and short message communication using QZSS
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Quasi-Zenith Satellite System
Link (geometry)
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This paper introduces the principle, constituent, signal format, electrical performance and techniques of the radio determination and communication experimental system (RDCES) using two satellites, and gives the experiment results of RDCES developed in China. The experimental results obtained from RDCES show that positioning, communication and timing synchronisation can be implemented in the same satellite channel.< >
Communications satellite
Radio channel
SIGNAL (programming language)
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This paper deals with the configuration of the service link and proposes a CDMA based multimedia transmission scheme for the up link of the next generation low Earth orbit satellite (NeLS) system. To realize the proposed NeLS system, this paper deals with service link part, and proposes QS-CDMA as a candidate for the uplink multiple access method. In order to simplify the initial acquisition and synchronization scheme to establish connection, the position information of the user terminals is assumed to be known. The required accuracy of the position information is evaluated.
Link (geometry)
Position (finance)
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Highly-dependable wireless communication using satellites has been getting much attention for emergency use. In order to achieve direct access between numerous personal terminals and satellite, we have proposed spread spectrum code division multiple access (SS-CDMA) communication system. It adopts long spreading code and high accuracy positioning signal from Quasi-Zenith Satellite System (QZSS). SS-CDMA has to provide the high reliable short message communication to several million terminals in limited time with limited frequency band. Thus high multiplexing rate CDMA in uplink is employed. Keeping orthogonality among all terminals using the QZSS positioning service is a fundamental requisite. However, terrestrial terminals do not always keep the suitable situation for positioning. In this paper, system stability is evaluated in the case of the part of terminals loses the orthogonality in time and frequency domain. We show transmit performance degradation in such case and reveal that the system stability can be kept.
Quasi-Zenith Satellite System
Near-far problem
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To maintain and control a satellite cluster effectively, an on-board executive controller is necessary. Both information exchange among satellites and relative position determination with high accuracy in real time are of prime importance in satellites formation flying. This paper firstly gives an overview of present research programs on formation flying satellite clusters with inter-satellite links (ISL). Several proposals for the development of ISL low layer protocols are presented in the paper. A novel satellite-to-satellite ranging model based on direct spread spectrum in inter-satellite radio links are presented, and finally, the corresponding expected system performance of ranging accuracy is analyzed theoretically.
Ranging
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The Japanese Quasi-Zenith Satellite System (QZSS) offers the possibility to transmit information with an unprecedented bit rate of 2000 bps via the L-band experimental signal. This feature can be used to disseminate Japan Standard Time, i.e., Universal Time Coordinated (UTC)(NICT), to any user capable of receiving the new QZSS signal. Various timing transmission modes as well as a dedicated ionosphere correction model allow users to instantaneously realize UTC(NICT) across Japan with an uncertainty of a few nanoseconds. However, a sophisticated real-time ionosphere correction model also needs to be transmitted to the user to compensate for dispersive ionosphere delays which are the largest contributor to the total error budget of the system.
Quasi-Zenith Satellite System
Zenith
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An outline and the multiple access techniques used in a domestic satellite communications system accommodating numerous small Earth stations are presented. Two kinds of Earth stations are employed in this system, a small Earth terminal (SET) and a master Earth station (MES). Forty-eight two-way satellite channels were achieved in the 6/4 GHz bands with a transponder eirp of about 62 dBm. Time division multiplex is employed in the MES to SET link and spread spectrum multiple access in the SET to MES link.
Transponder (aeronautics)
Communications satellite
Time-division multiplexing
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A dual frequency GPS and a geostationary communication satellite based time and frequency transfer network have been established for the Asia-Pacific region. Some stations link to Europe with both methods. Consequently, we can compare the performance of GPS carrier phase time or frequency transfer to a two-way satellite time and frequency transfer, and vice versa. The difference between the two methods shows good consistency in the regional network. On the other hand, for intercontinental links there is an obvious variation with the diurnal and secular changes.
Time transfer
Communications satellite
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Quasi-Zenith Satellite System
W-CDMA
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