The total allotted bandwidth available for space-toearth data transmission is 20 MHz in S-band, 375 MHz in X-band and 1500 MHz in Ka-band for Indian Remote Sensing (IRS) Satellites. The band allotted to communication satellites for space to earth communication in GEO missions is C-band (3.7-4.2 GHz). In this band, a small portion is identified for telemetry (TM) data transmission to ground. The...

The field of satellite communications is enjoying a renewed interest in the global telecom market, and very high throughput satellites (V/HTS), with their multiple spot-beams, are key for delivering the future rate demands. In this article the state-of-the-art and open research challenges of signal processing techniques for V/HTS systems are presented for the first time, with focus on novel app...

The ITU Radiocommunication Assembly, considering a) that one of the principal limitations in achieving greater utilization of the RF spectrum and geostationary orbit for the fixed-satellite service (FSS) is mutual interference among satellite networks operating in common frequency bands and serving the same or adjacent geographical areas; b) that inter-satellite network interference protection ...

Satellite communication systems are the means of realizing a global broadband integrated services digital network. Due to the statistical nature of the integrated services tra c, the resulting rate uctuations and burstiness render congestion control a complicated, yet indispensable function. The long propagation delay of the earth-satellite link further imposes severe demands and constraints on...

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 aim of this work is to create a tool that can simulate the transmission of both connectionoriented and connection-less traffic over a constellation of LEO/MEO (Low Earth Orbit/ Medium Earth Orbit) satellites. We hope to provide a performance evaluation of various constellation access techniques and routing policies. The simulator, named GaliLEO, will be written in Java and will integrate re...

The present paper considers the problem of autonomous synchronization of attitudes in a swarm of spacecraft. Building upon our recent results on consensus on manifolds, we model the spacecraft as particles on SO(3) and drive these particles to a common point in SO(3). Unlike the Euler angle or quaternion descriptions, this model suffers no singularities nor double-points. Our approach is fully ...

Wireless communication is used in many different situations such as mobile telephony, radio and TV broadcasting, satellite communication, and military operations. For all these situations, a frequency assignment problem arises with application of specific characteristics. Different modelling ideas for every problem features, have been developed such as the handling of interference among radio s...

Over the course of the DANDE satellite mission the satellite’s communication system has not been thoroughly reviewed in order to determine the quality of its connection to the COSGC ground station over time. This paper will focus on what factors, either environmental, ground station based, or satellite based, have influenced the ability of the DANDE mission operations team to uplink and downlin...

Based on the study of HLA (High Level Architecture) and OPNET-HLA interface, the dynamic control of simulation process and the real-time update of simulation for LEO (Low-Earth-Orbit) satellite communication system were achieved on multiple computers. In the distributed interactive simulation, a satellite’s location is controlled, then the end-to-end delay time and the routing table of Iridium ...