In many situations, it is necessary to transmit data from one place to an other. A classical example is the transmission of data via satellites. Also playing music on a compact disc is an example of data transmission; the music stored in a binary form on the compact disc is transmitted via a laser beam to the compact disc player and reconverted into music. During the transmission of data, it is...

The frequency errors dominated by the dynamic Doppler is analyzed for mobile satellite communication systems employing fast-moving satellites. Methods are proposed and analyzed for the basestations to measure and compensate the dynamic Doppler of large range. It is shown that the proposed methods give the minimum uncertainty of the dynamic Doppler for the modem to handle. Therefore, these metho...

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...

Abstract A model for the Low Earth Orbit (LEO) satellite communications channel is proposed in this paper. This model is validated through real measurements gathered from a satellite in LEO for a wide range of elevation angles. It is shown that that the burst statistics of the channel are sufficiently described by a multiplestate Fritchman model and four-state Markov model. This model has been ...

The Skynet 5 system will provide military satellite communications to all three UK armed services, and is to be procured as a ‘private finance initiative’ (PFI). Though there are many PFI projects across all parts of the public sector, this is the first time that such an approach has been taken for providing military satellite communications. On 26 February 2002, the Ministry of Defence announc...

The Advanced Communications Technology Satellite (ACTS) Mobile Terminal (AMT) is a proof-of-concept K/Ka-band mobile satellite communications terminal under development by NASA at the Jet Propulsion Laborato~. Currently the AMT is undergoing system integration and test in preparation for a July 1993 ACTS launch and the subsequent commencement of mobile cxpcrimcnts in the fall of 1993. The AMT o...

This article introduces the application of machine learning (ML)-based procedures in real-world satellite communication operations. While ML image processing has led to unprecedented advantages new services and products, wireless systems is still its infancy. In particular, this focuses on introduction ML-based mechanisms network operation centers such as interference detection, flexible payloa...

A functional description of a communications satellite beacon receiver is presented. The system, designed primarily for LES-5/6, is capable of reliable unattended operation, and provides a frequency and time reference for fixed and highly mobile satellite communications terminals. Theoretical and experimental data are given, with particular emphasis on automatic acquisition and tracking of the ...