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Enfora Enabler II-G Assisted GPS
Modem Integration Guide
4.6. Assisted GPS System Overview
Normally, the GPS receiver provides a position with latitude and longitude information after it decodes
ephemeris data of the satellites in view. The process of searching for satellites, and decoding its
ephemeris can take anywhere from tens of seconds to hundreds of seconds. To speed up this
process, assistance data containing satellite ephemeris can be downloaded to the Enfora Enabler II-
G A-GPS module to aid in a faster time to first fix (TTFF) with a higher precision of accuracy.
The Enfora Enabler II-G Assisted GPS (A-GPS) module provides a compelling integrated module
approach to providing A-GPS and GPRS packet data solutions in a single module. This
implementation provides various alternatives from simple autonomous GPS processing to Assisted
GPS solutions. The integration of the GPS chipset inside the Enabler modem reduces the complexity
of system integration when location aware solutions are being developed. This allows for smaller
sizes, faster updates, and lower overall system cost.
For additional detail regarding the various GPS modes available, see MLG0208AN001 - Assisted
GPS Module Modes of Operation.
MLG0208PB001 12 Version1.01 – 10/3/2006