nasa
RSS nasaMobiles on the moon, Google Android, Facebook fall
News Spring is almost in the air but something else taking off this month was news Nasa is planning to build a mobile phone network on the moon. Clearly current levels of demand for mobile coverage on the big green cheese-wheel in the sky are not... [28 Feb 2008]
Photos: Lunar mobile phones preparing to soar
Photo In space no one can hear your ringtone - something that could be a blessing from 2012 when Nasa and the British National Space Centre (BNSC) trial a mobile phone network on the moon. The joint Nasa/BNSC MoonLite mission, due to be launched after... [25 Feb 2008]
The Weekly Round-Up: 22.02.08
Round-Up Anyway, the moon it is and the satellite system should ensure a full five-bar signal for lunar colonists living in the base Nasa wants to build at the south pole of the desolate, dusty rock. Nasa and the British National Space Centre are preparing... [22 Feb 2008]
Mobiles on the moon? Nasa prepares trial for takeoff
News Even in the cosmos there will be no escaping the ringtone as Nasa and the British National Space Centre (BNSC) prepare to trial a mobile phone network for the moon. The satellite system should ensure a full four-bar signal for lunar colonists... [19 Feb 2008]
Siemens Case Study: NASA Jet Propulsion Laboratory (JPL)
White Paper In August 2002, the Mechanical Systems Division at the Jet Propulsion Laboratory (JPL), a NASA center managed by the California Institute of Technology, decided to use a single source for all the tools it uses for large-scale projects. [14 Jan 2008]
Siemens Case Study: Rocketplane Kistler
White Paper Rocketplane Kistler wanted to build a re-usable space vehicle as cost-effectively as possible to meet schedule targets imposed by NASA to be launched in 2009. The company used a virtual mockup of the entire spacecraft incorporating manufacturing... [14 Jan 2008]
A History of the Improvement of Internet Protocols Over Satellites Using ACTS
White Paper These experiments have been jointly conducted by NASA's Glenn Research Center and Ohio University over the last six years. This paper outlines the main results of a number of ACTS experiments on the efficacy of using standard Internet protocols... [14 Jan 2008]
Simulation of TCP for Orbiting Spacecraft Through the TDRS Satellite System
White Paper NASA engineers have designed an interface system that connects the Space Shuttle and Space Station communication system to the Internet on Earth. Such a system allows for the astronauts to use services like the World Wide Web and Electronic Mail. [14 Jan 2008]
On the Performance of TCP Spoofing in Satellite Networks
White Paper This paper analyzes the performance of TCP in a network that consists of both satellite and terrestrial components. One method, proposed by outside research, to improve the performance of data transfers over satellites is to use a performance... [14 Jan 2008]
TCP Byte Counting Refinements
White Paper TCP's delayed acknowledgment algorithm has been shown to hurt TCP performance. One method of gaining the performance lost by reducing the number of acknowledgments sent is to use a limited byte counting algorithm. [14 Jan 2008]
On Estimating End-to-End Network Path Properties
White Paper The more information about current network conditions available to a transport protocol, the more efficiently it can use the network to transfer its data. In networks such as the Internet, the transport protocol must often form its own estimates of... [14 Jan 2008]
SCPS-TP, TCP and Rate-Based Protocol Evaluation for High Delay, Error Prone Links
White Paper This paper describes testing performed to validate operation of Space Communications Protocol Suite Transport Protocol (SCPS-TP) relative to the specification and perform a comprehensive comparison of SCPS-TP protocol options to IP based protocols. [14 Jan 2008]
On the Effective Evaluation of TCP
White Paper Understanding the performance of the Internet's Transmission Control Protocol (TCP) is important because it is the dominant protocol used in the Internet today. Various testing methods exist to evaluate TCP performance, however all have pitfalls... [14 Jan 2008]
TCP Behavior in Networks With Dynamic Propagation Delay
White Paper This paper provides a preliminary investigation into the impact a link with changing propagation delay has on the performance of TCP file transfers. The paper investigates over a dozen different variable delay patterns, based on spacecraft movement. [14 Jan 2008]
ATM QoS Experiments Using TCP Applications: Performance of TCP/IP Over ATM in a Variety of Errored Links
White Paper Asynchronous Transfer Mode (ATM) Quality of Service (QoS) experiments using the Transmission Control Protocol / Internet Protocol (TCP/IP) were performed for various link delays. The link delay was set to emulate a Wide Area Network (WAN) and a... [14 Jan 2008]
