An ATC Experiment Using a Geostationary Satellite

Tcp Performance in a Geostationary Satellite Environment

Geostationary satellite links have characteristics that can degrade the performance of TCP. The propagation time for a geostationary satellite link is on the order of 0.25 seconds. Thus a satellite can add approximately 0.5 seconds to the round trip time experienced by a TCP packet and the corresponding acknowledgement. This delay time is the primary cause of TCP inefficiency over satellites. T...

Performance on Geostationary Satellite Links - - Lessons Learned Using Acts

The ACTS system has provided the opportunity to closely study the operation of various data communications protocols at speeds of up to 1.536 Mbps (Megabits per second). We performed performance measurements using the TCP/IP protocol suite, particularly the application layer implementations of FTP. In a separate experiment we studied the SNA/SDLC protocol in Normal Response Mode. Our observatio...

Wind Estimation from Geostationary-satellite Pictures

The motion of properly selected clouds derived from photographs taken by the geostationary Advanced Technology Satellites provides estimates of the wind a t cloud level. A large number of lowand high-cloud motions near rawin stations are compared to the balloon-derived winds to determine the levels at which these wind estimates might be used for map analyses and to assess their accuracy a t tho...

An Aeronautical Mobile Satellite Experiment

Radio Planning in Multibeam Geostationary Satellite Networks

We consider the problem of how a geostationary satellite should assign bandwidth to several service providers (operators) so as to meet some minimum requirements, on one hand, and to perform the allocation in a fair way, on the other hand. In the paper, we firstly address practical issues (such as integrity constraints), whereafter we provide a computational method for obtaining an optimal fair...