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李明俊 《铁道物资科学管理》1996,(3):38-39
通信卫星物流管理系统──OmniTRACS黑龙江商学院李明俊译随着物流业的多用化、现代化的进展,竞争激烈的物流企业界也开始致力于信息系统的开发和应用。到目前为止所采用的信息系统,主要是物流VAN所代表的以地面网络系统为中心的业务部与业务部之间的订购和... 相似文献
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<正>长荣海运已经完成了对其全船队70艘集装箱船的国际海事卫星船用宽带卫星通讯服务的安装工作,使船舶达到最佳运营状态。 相似文献
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GPS已成为电子海图显示和信息系统的核心,不久将成为强制性IMO电子航海战略的一部分,使用导航与通信卫星技术已不再是稀有技术。关于在传统技术下现代导航仪需要发展到何种程度以及应具备怎样的船舶备份系统的争论正在逐步升级。依靠单一卫星航海系统的担心也在不断增加。到目前为止,虽没有出现实用性和可靠性问题,但把全球航海的鸡蛋放在同一个技术的篮 相似文献
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A practical antenna has been designed and developed for INMARSAT mobile satellite communications. The design uses low cost materials such as foam and copper foil to create a stacked microstrip antenna array. Several techniques were adopted to enhance the impedance bandwidth and axial ratio bandwidth. The final design parameters were optimized by EM simulation. Finally, the L-strip fed six-element stacked microstrip antenna array was constructed and tested. Simulated and measured results show that in the whole INMARSAT work band, the VSWR of the antenna is less than 1.6, its antenna gain is higher than 15dB and wide-angle axial ratio (AR) 3dB is more than 21°. The antenna has been successfully used with a HNS 9201 terminal. 相似文献
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