Communication Satellites

Advanced Tracking and Communication Satellites

Connecting Grids Using Communication Satellites

Grid computing is viewed as a strong alternative to traditional supercomputers and mainframes. Grid computing is expanding its horizon to replace the current Internet as well as to address issues related to data sharing, collaboration, security, economics, and so forth. We treat a grid as a single global computer for a given community connecting all types of resources. Most of the current grid ...

Traffic assignment in communication satellites

A high capacity communication satellite interconnects scores of ground stations simultaneously. Under the Satellite-Switched/ Time Division Multiple Access (SS/TDMA.) system, each channel of the satellite is allocated to a pair of ground stations for a certain time period, after which the whole set of allocations (called a switch) is changed simultaneously. The problem we address is to minimize...

Using Commercial Satellites to Provide Communication

NASA is interested in using commercial satellites to provide broadband communications support for future space missions. In this paper, we describe a large-scale simulation model that we plan to use for detailed performance studies of critical parameters. We focus on the unique challenges we face and how we plan to use simulations to investigate: • the feasibility of using proposed commercial c...

Neural Network Model for Nonlinear Memoryless Communication Channels in Satellites

A technique of Satellite Communication technologies based on Neural Networks approach is proposed for modeling nonlinear memoryless communication channels in satellites. The input and output data of the Traveling Wave Tube Amplifier (TWTA) is taken and a Neural Network model is designed to simulate the functionality of TWTA. The idea is presented to use the learning quality and generalization o...