Gps - Nokia 6275 Baseband Description And Troubleshooting

6275/6275i (RM-154)
Baseband Description and Troubleshooting

GPS

The GPS turns on by using Vcore and VIO from the UEMEK. The GPS communicates with
the D2800 using the UART interface and turns on the GPS engine's BB integrated circuit
and RF integrated circuit. They synchronize with the mobile terminal using the 19.2 Mhz
clock. The mobile terminal locates the closest satellite and downloads the location
coordinates to send them to the emergency desk.
The GPS baseband module performs the following:
• Accepts the GPS raw data from the front end
• Processes the raw data to provide the CE with location information (2 CPUs)
• Accepts commands from the CE
• Manages modes (sleep, idle, etc.)
• Issues RF control commands
• Manages GPS configuration
• Provides power for the FPS RF
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Figure 8: GPS block diagram
Company Confidential
Nokia Customer Care
Issue 1 - September 2006