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Globalstar Overview
1-2 80-99240-1 Rev. D
Space Segment
The space segment consists of 48 LEO satellites (and eight
additional in-orbit spares) built by Loral Space Systems and
operated by Globalstar Limited Partnership (GLP) in San
Jose, CA.
Compared to medium-Earth-orbit or geostationary-
Earth-orbit (MEO/GEO) satellites, LEO satellites offer
several advantages: minimal delay (~250 ms or comparable to
terrestrial digital cellular), multi-satellite handoff, extremely
small antenna, lower power consumption, and lower cost.
Ground Segment
The ground segment consists of Earth stations called
Gateways, which provide service in specific geographical
areas. The Gateways are deployed worldwide and
communicate via C-band frequencies to/from the LEO
satellites, which serve as “bent pipe” transponders.
User Terminals communicate to/from a Gateway ground
station using L- and S-band frequencies, via the LEO
satellites.
A User Terminal can be either a QUALCOMM Globalstar
GSP-1600 Tri-Mode Phone, or QUALCOMM Globalstar
GSP-1620 Satellite Data Modem.
Coverage
Figure 1-1 shows Globalstar coverage areas and availability
dates.
- Table of Contents 3
- 80-99240-1 Rev. D v 5
- 80-99240-1 Rev. D vii 7
- List of Figures 10
- List of Tables 11
- Revision History 13
- About This Specification 15
- Notational Conventions 16
- Abbreviations and Acronyms 17
- 80-99240-1 Rev. D xix 19
- Related Documentation 21
- Cautions and Warnings 21
- 1 Globalstar Overview 23
- Space Segment 24
- Ground Segment 24
- Coverage 24
- 80-99240-1 Rev. D 1-3 25
- Carriers 26
- 80-99240-1 Rev. D 1-5 27
- Globalstar Overview 28
- 1-6 80-99240-1 Rev. D 28
- 2 GSP-1620 Modem Overview 29
- GSP-1620 Modem Overview 30
- 2-2 80-99240-1 Rev. D 30
- 80-99240-1 Rev. D 2-3 31
- 80-99240-1 Rev. D 2-5 33
- Electric Utility Industry 34
- 80-99240-1 Rev. D 2-7 35
- Water Treatment Plants 36
- Remote Inventory Management 37
- Energy Management 37
- Agriculture 38
- Aviation 38
- 3 Features 39
- AT Commands 40
- Modes of Operation 40
- Short Messaging Service (SMS) 40
- SMS Alerts 41
- SMS Message Field Information 41
- Globalstar Service Alerts 42
- Service Status Message 43
- Packet Data Service 45
- Dynamic IP Addressing 47
- Fixed IP Addressing 47
- Dormant Mode Service 48
- Asynchronous Data Service 49
- Data Rate and Throughput 51
- Features 52
- 3-14 80-99240-1 Rev. D 52
- 4 AT Commands 53
- 5 Hardware Description 57
- Modem Antenna Connectors 60
- Data and Control Ports 60
- Control Port Signals 61
- Data Port Signals 62
- Table 5-1 63
- Diagnostic Port 65
- DC Power 66
- Surge Protection 67
- EMI Filtering 67
- Power Consumption 68
- Power-On 68
- Grounding 70
- Modem Antenna Specifications 72
- Antenna Dimensions and Weight 73
- Antenna Depiction 73
- Hardware Description 74
- 5-18 80-99240-1 Rev. D 74
- Antenna Cable Specifications 75
- Table 5-3 76
- 5-22 80-99240-1 Rev. D 78
- Mounting Multiple Antennas 79
- 5-24 80-99240-1 Rev. D 80
- GSP-1620 Modem Environments 81
- Thermal Radiation 82
- Altitude 83
- Vibration 83
- Mechanical Shock 85
- Acoustic Noise 85
- Environments 86
- Temperature/Humidity 87
- Icing/Freezing Rain/Snow 88
- RF Connector Durability 91
- Materials 91
- Shipping 91
- Environmental Specifications 92
- 6-12 80-99240-1 Rev. D 92
- Certification 93
- 7-2 80-99240-1 Rev. D 94
- RF Restrictions 95
- Pacemakers 97
- Hearing Aids 97
- Other Medical Devices 98
- 8 Modem Integrator’s Kit 99
- 80-99240-1 Rev. D 8-3 101
- Modem Integrator’s Kit 102
- 8-4 80-99240-1 Rev. D 102
- 9 Warranty 103
- Warranty 104
- 9-2 80-99240-1 Rev. D 104
- 10 Product Support 105
- Order Fulfillment Information 106
- 80-99240-1 Rev. D 10-3 107
- Contact information 108
- 80-99240-1 Rev. D 10-5 109
- Product Support 110
- 10-6 80-99240-1 Rev. D 110
- A Specification Summary 111
- [1] q = 0 is zenith 113
- [3] at Tsky = 200 K 113
- Specification Summary 114
- A-4 80-99240-1 Rev. D 114
- 80-99240-1 Rev. D Index-1 115
- Index-2 80-99240-1 Rev. D 116
- 80-99240-1 Rev. D Index-3 117
- 80-99240-1 Rev. D Index-5 119
- Index-6 80-99240-1 Rev. D 120
- 80-99240-1 Rev. D Index-7 121
- Index-8 80-99240-1 Rev. D 122
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