Transcript
ORBCOMM SATELLITE SYSTEM
Report Contents
• 1. Introduction• 2. Satellite Description• 3. Satellite System• 4. Constellation Coverage & Availability• 5. Communication Payload• 6. Data Session Description• 7. ORBCOMM link Budget parameters
1. Introduction
2. Satellite Description
3. Satellite System
• The ORBCOMM System consists of :
- A space segment consisting of 35 LEO Satellites.
- A ground segment consisting of Gateway Earth Stations
(GES).
- Control centers located throughout the world.
- A subscriber segment consisting of communicators used by
ORBCOMM System subscribers to transmit and receive
information to and from the LEO Satellites.
• 3.1 Multiple Access ProtocolsTwo different types of communication channels:
1- random access channels2- reservation/messaging channels.
• 3.2 ORBCOMM Service Elements1-Data Reports2-messages3-datagrams4-commands
• 3.3 Dynamic Channel Activity Assignment System (DCAAS)
• 3.4 Position Determination Capabilities
4. Constellation Coverage & Availability
• 4.1 Operational Frequencies & Channelization Plan
5. Communication Payload
• The communication subsystem is the principal payload flown on the Satellite. This subsystem consists of four major parts: – The subscriber communications section– The ORBCOMM Gateway communications section– The Satellite network computer – UHF transmitter
• 5.1 Subscriber Communications Section• 5.2 ORBCOMM Gateway communications section• 5.3 Satellite Network Computer
• 5.4 UHF Transmitter- 5.4.1 Antenna Pattern
A dual-band quadrifilar helix antenna circularly polarized
• 5.4.2 Attitude Control System
6. Data Session Description
6.1 Data Session Setup
6.2 SC- Terminated Message Transfer
7. ORBCOMM Link Budget Parameters
7.1 GES-to-Satellite Link Budget
ORBCOMM GES-to-Satellite Uplink Budget
7.2 Satellites-to-Subscriber Link Budget
Satellite-to-Subscriber Link Budget
7.3 Subscribers-to-Satellite Link Budget
Subscriber-to-Satellite Link Budget
7.4 Satellites-to-Gateway Link Budget
Satellite-to-Gateway Link Budget
7.5 UHF Transmitter Link Budget
UHF-to-Subscriber Downlink Budget
Conclusion
• The Orbcomm satellite system has a many services like:
• - Storage tank monitoring• - Pipeline monitoring• - Truck trailer, container & railcar tracking• - Heavy equipment tracking• - Military tracking logistics• - Personal & commercial messaging • - Automotive messaging & position location
Thank you
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