Space 

Communication Satellites

Communication satellites are platforms launched into orbit around the Earth, in outer space, for the purpose of relaying and amplifying radio communication signals by using transponders.

Communication satellites provide Line-of-Sight (LOS) communication channels between transmitting and receiving stations positioned at considerable distances from one another around the globe.

Communication satellites support TV broadcasting, telephony and wireless communication, Internet and military applications. More than 2,000 active communication satellites are currently in orbit around the Earth, operated by business and government organizations.

Wireless communication generates electromagnetic waves that travel through the ether. The propagation characteristics of radio waves in certain frequency bands (usually the higher and more reliable frequency bands) require that a Line-of-Sight exist between the transmitting station and the receiving station so that the waves may propagate along a straight and unobstructed line, thereby ensuring uninterrupted transmission and reception. Naturally, the curvature of the Earth obstructs waves in these frequency bands when they are exchanged by stations between which no Line-of-Sight exists. As they are positioned in outer space, communication satellites can relay the transmitted signals under Line-of-Sight conditions: they can pick up a transmission from a station located on one side of the globe and relay that transmission to a station located on the other side of the globe, thereby providing unobstructed communication between geographically separated stations.

Communication satellites utilize various radio and microwave frequencies. To prevent signal interference, international organizations enforce rules and regulations that effectively allocate the frequency resources to the satellite users.

Our communication satellite services include stationary and mobile communication support for commercial TV broadcasters, DBS (Direct Broadcast Satellite TV) operators, government organizations and VSAT (Very Small Aperture Terminal) networks.

  • Primary Characteristics (ComSat IV)
    • Cutting-edge agile payloads
    • Payload hosting – flexible integration
    • Digital processing unit
    • Satellite control system
    • Highly reliable, fully redundant architecture
    • Payload power: 9,000 W
    • Payload weight: 900 kg
    • Insertion orbit: GTO, direct to GSO
    • Launcher compatibility: Zenit 3SLB/FB, Roton-M, Ariane 5, Falcon 9
    • Life expectancy: 15 years

    Attitude & Orbit Control System

    • Attitude control – star tracker, reaction wheels
    • Plasma Propulsion Sub-system (PPS)
    • Pointing accuracy: 0.06 – 0.12 degrees

    Command & Telemetry

    • Compatible with CCSDS / ESA standards
    • Reed Solomon & Viterbi encoding and PSK modulation support
    • Command frequency agility

    Ground Control System

    • Virtual payload management for hosted payload applications
    • Privatization for hosted payload applications
    • Fragmented payload control system
    • Dynamic allocation of resources
    • Extensive automation of platform & payload control
    • Advanced mission control center

    Payload Connectivity & Frequency Plan

    • Up to 45 transponders
    • Frequency bands: Ka, Ku, C, X, S & L
    • Agile transmission & reception frequency plan including cross banding
    • Cross beam connectivity
    • Transponder bandwidth selectivity
    • Up to 3.5 GHz reception bandwidth per beam
    • Multiple reception beams combined into a single transponder

    Antenna

    • Up to 10 antenna reflectors
    • Reflector diameter up to 2.6 m
    • Shaped & dual grid antennae
    • Multi beam Ka-band antennae
    • Deployable, steerable & fixed antennae

    Digital Processing Unit

    • Improved transponder bandwidth utilization
    • Improved adjacent channel rejection
    • Enables Automatic Level Control (ALC) per carrier
    • Multi-beam applications (e.g. broadband)

    Pre-Distortion Satellite Operation

    • 24/7 satellite control station
    • Multiple vendor satellite operation
    • Payload management
    • Satellite & subsystem expert assistance
    • Dynamic user & carrier monitoring, including interference detection

    Satellite Range

    Our communication satellite range currently includes various satellites in GEO orbit, as an FSS (Fixed Satellite Service) type and more.

CONTACT ACS

Laurierstraat 71 HS, 1016 PJ, Amsterdam
The Netherlands

Tel:   +31- 20-8115091
Fax:  +31-20-3305444

Mail: Info@acs-tech.nl