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