There is a growing interest among scientists to coordinate diverse and temporally responsive measurements from multiple space and ground-based observatories in order to obtain greater insights into transient scientific events than would otherwise be possible. Many transient scientific events of interest occur randomly and the scientific value of follow-up observations decays with time. As a result, transient science operations among distributed observatories require timely access to communications network services. This paper develops two complimentary methods to improve users’ network access timeliness using the NASA Space Network (SN). Descriptive models of each method are developed using Systems Modeling Language. Pathfinder experiments are designed and executed. Suitability of the methods is discussed in light of the experimental results. Innovative applications of the methods are presented. This research establishes that the as-built SN systems have adequate capabilities and capacity to support infusion of the methods to current and future users with emergent time-sensitive service needs. The minimum service access wait time was determined to be approximately 10 min and is achievable 84% of the time. An average access wait time of approximately 14 min is expected when SN resource blocking occurs. A roadmap to improve SN access timeliness is presented.

科学家们越来越需要协调来自多个空间和地面观测站的各种时间响应性测量，以获取对瞬态科学事件的更多见解。许多感兴趣的瞬时科学事件是随机发生的，后续观察的科学价值会随着时间而下降。结果，分布式观测站之间的瞬态科学操作需要及时访问通信网络服务。本文提出了两种互补的方法，以使用NASA太空网络（SN）来提高用户的网络访问及时性。每种方法的描述性模型都是使用系统建模语言开发的。设计并执行探路者实验。根据实验结果讨论了该方法的适用性。介绍了方法的创新应用。这项研究确定，建成的SN系统具有足够的能力，可以支持向具有紧急时间敏感性服务需求的当前和未来用户注入方法。确定的最小服务访问等待时间约为10分钟，并且可以在84％的时间内实现。发生SN资源阻塞时，预计平均访问等待时间约为14分钟。提出了改善SN访问及时性的路线图。确定的最小服务访问等待时间约为10分钟，并且可以在84％的时间内实现。发生SN资源阻塞时，预计平均访问等待时间约为14分钟。提出了改善SN访问及时性的路线图。确定的最小服务访问等待时间约为10分钟，并且可以在84％的时间内实现。发生SN资源阻塞时，预计平均访问等待时间约为14分钟。提出了改善SN访问及时性的路线图。