User's Manual

What Is the GPS System? How the OmniVision™ System Works
1-4 1/9/06 80-J4866-1 Rev. A
ALL INFORMATION SUBJECT TO CHANGE
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What Is the GPS System?
Originally created for and used by the military, GPS is a worldwide radio-navigation system
formed from a constellation of 24 satellites and their ground stations. GPS uses the satellites
as reference points to calculate positions accurate to a matter of meters. Essentially, GPS
allows every square meter of the planet to have a unique address. Currently, GPS is used in a
number of industries, including construction, film, farming, computer, transportation,
telecommunication, and wireless industries.
GPS is a standard feature for the OmniVision MCP.
How the OmniVision™ System Uses GPS
Signals received from the GPS constellation of 24 strategically-placed satellites determine
and report to the NMC where the MCP is located.
The MCP receives positioning data from the GPS receiver which is integrated or “housed”
inside the SDM. The location data is then “packaged” for satellite transmission to the
customer dispatch center via the Data satellite and the NMC.
The NMF receives position data from an MCP whenever a message is sent to a vehicle and
acknowledged, and whenever a driver sends a message to a dispatcher.
The NMC also retrieves position data automatically at regular intervals and makes data
available to the dispatcher. The dispatcher can also request a position report at any time.
Network
Management
Facility (NMF)
Company
Dispatch
Data
Satellite
Forward Message Links
Return Message Links
GPS
Satellites
Key:
Mobile Computing
Platform (MCP)
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