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首页> 外文期刊>International Journal of Satellite Communications and Networking >Examination of the data rate obtainable with low-gain non-tracking antenna applied to user terminal used for mobile communications and broadcasting services provided by quasi-zenithal satellites
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Examination of the data rate obtainable with low-gain non-tracking antenna applied to user terminal used for mobile communications and broadcasting services provided by quasi-zenithal satellites

机译：检验适用于用户终端的低增益非跟踪天线可获得的数据速率，该用户终端用于准天顶卫星提供的移动通信和广播服务

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摘要

Link budgets between the mobile user terminal and a feeder link station (2-m-diameter antenna) through the quasi-zenithal satellite system (QZSS) (7-m-diameter antenna for Tx, 5-m-diameter antenna for Rx) under the power flux density (PFD) limit were calculated for the Ka- and Ku-band. The PFD limit for non-geostationary satellites is applied for frequency sharing between QZSS and geostationary satellites. The maximum data rate in the Ka-band was 1.7 times higher than in the Ku-band in the forward link, while the maximum data rate at Ku-band is nine times higher than that in the Ka-band in the return link when the transmit power derived from the regulations of the PFD is applied. And it is more than three times higher than that in the Ka-band when transmit power is fixed to 2 W. In the forward link, maximum data rates are 149 kbps in the Ka-band and 86 kbps in the Ku-band when the user terminal antenna is non-tracking (gam at the satellite direction is 7.1 dBi) and the frequency bandwidth per beam is 30 MHz. Required bandwidth per channel for a certain data rate is large, e.g. in Ka-band, 20.9 MHz for 64 kbps, 125 MHz for 384 kbps, and 326 MHz for 1 Mbps. In the return link, the maximum data rates are 44 kbps in the Ku-band and 13.6 kbps in the Ka-band when the user terminal antenna gain in the satellite direction is 7.1 dBi and transmit power is 2 W.
机译：在移动用户终端和馈线链接站（直径为2米的天线）之间通过准天顶卫星系统（QZSS）（Tx直径为7 m天线，Rx直径为5 m天线）之间的链路预算计算了Ka和Ku波段的功率通量密度（PFD）极限。非对地静止卫星的PFD限值适用于QZSS与对地静止卫星之间的频率共享。当前向链路中，Ka频段的最大数据速率比Ku频段高1.7倍，而当反向链路时，Ku频段的最大数据速率比返回链路中的Ka频段高9倍。使用从PFD的规定得出的发射功率。当发射功率固定为2 W时，它是Ka频段的三倍多。在前向链路中，当Ka频段的最大数据速率为149 kbps，在Ku频段的最大数据速率为86 kbps。用户终端天线是非跟踪的（卫星方向的距离为7.1 dBi），每波束的频率带宽为30 MHz。对于某个数据速率，每个通道所需的带宽很大，例如在Ka频段中，对于64 kbps为20.9 MHz，对于384 kbps为125 MHz，对于1 Mbps为326 MHz。在返回链路中，当用户终端在卫星方向的天线增益为7.1 dBi，发射功率为2 W时，Ku频段的最大数据速率为44 kbps，Ka频段的最大数据速率为13.6 kbps。

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