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首页> 外文会议>14th international technical meeting of the Satellite Division of the Institute of Navigation (ION GPS-2001) >GPS IIF and Modernization – Taking the MostAdvantage of GPS IIF Flexibility
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GPS IIF and Modernization – Taking the MostAdvantage of GPS IIF Flexibility

机译：GPS IIF和现代化–充分利用GPS IIF灵活性的优势

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The Block IIF contract called for a Space Vehicle thatrnwould provide for flexibility and growth. Now after fivernyears, launch vehicle changes, and GPS modernization,rnthe Block IIF SV design is still ready to meet the call.rnThe original spacecraft bus design flexibility has allowedrnBoeing to provide a modernized signal-in-space (SIS) andrnmeet new civil requirements. Our navigation payloadrnprovides the necessary flexibility to generate and transmitrnthe presently defined signals, yet allow changes to the SISrneven while on orbit in the event that the signal definitionrnneeds to be changed. In addition to providing for newrnmilitary requirements, the modernized IIF will begin arnnew era in civil navigation services with L5 and additionalrncivil signal on L2. Performance and operationalrnenhancements of the original IIF system will be carriedrnover to these new services. This paper will describernchanges to the GPS IIF architecture, new navigation servicesrnthat will be offered and associated performance predictions.rnIn addition, flexibility features being designedrnin for growth, as well as to reduce risk of future requirementrngrowth, are highlighted.
机译：IIF的大宗合同要求提供太空飞行器，以提供灵活性和增长性。经过五年的发展，运载工具的变更和GPS的现代化，Block IIF SV设计仍可以满足这一要求。原始的航天器总线设计灵活性使波音公司能够提供现代化的空间信号（SIS）和满足新的民用要求。我们的导航有效载荷为生成和传输当前定义的信号提供了必要的灵活性，但即使在信号定义需要更改的情况下，也允许在轨道上对SIS进行更改。除了满足新的军事需求外，现代化的IIF还将以L5和L2上的其他民用信号开始在民航服务的新时代。原始IIF系统的性能和操作增强将被转移到这些新服务中。本文将描述GPS IIF架构的变化，将提供的新导航服务以及相关的性能预测。此外，还将着重介绍为增长而设计的灵活性功能，以及降低未来需求增长的风险。

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