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For Maritime Communications, Reliability No. 1 Factor

机译:对于海事通信,可靠性是第一要素

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Satellite networks vary greatly in terms of their orbits, architecture and technologies - different numbers of satellites, different coverage areas, different distances from Earth and different communications infrastructures, to name a few. We can debate, at length, the positive and negative aspects of these. Yet when reliability is the gating factor - as it is in the maritime industry, where loss of communications can mean lost lives - a low Earth orbit (LEO) satellite network such as Iridium's provides a uniquely reliable option. When it comes to measuring reliability, organizations like the International Maritime Organization (IMO) set the standard of 99.9 percent network availability for providing Global Maritime Distress Safety Services (GMDSS). When you translate that into minutes, it means that there can be cumulative outages of no more than 53 minutes per year. Iridium's network architecture minimizes the impact outages have on users, ensuring this standard is met even if there may be an issue with a satellite. However, with geostationary satellite networks, that may not always be the case, and service outages resulting from a satellite failure affect a much greater area and potentially last far longer due to how the networks are designed to operate.
机译:卫星网络的轨道,架构和技术各不相同-卫星数量不同,覆盖范围不同,距地球的距离不同以及通信基础设施不一而足。我们可以详细讨论这些方面的积极和消极方面。然而,当可靠性成为关键因素时(例如在海运行业中,通信中断可能意味着生命损失),诸如铱星公司这样的低地球轨道(LEO)卫星网络提供了独特的可靠性选择。在衡量可靠性方面,国际海事组织(IMO)等组织为提供全球海事遇险安全服务(GMDSS)设置了99.9%的网络可用性标准。当您将其转换为分钟数时,这意味着每年最多可能发生53分钟的累积中断。 Iridium的网络体系结构最大程度地减少了中断对用户的影响,即使卫星出现问题,也可以确保满足该标准。但是,对于地球静止卫星网络,情况并非总是如此,由于网络故障的原因,卫星故障导致的服务中断会影响更大的区域,并且使用寿命可能更长。

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  • 来源
    《Space news》 |2014年第29期|17-17|共1页
  • 作者

    BRIAN PEMBERTON;

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