Motorola 8900 - Blackberry Curve Cell Phone OEM Car Charger, Developer'S Manual

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GPS Interface
44 C24 Module Hardware Description December 15, 2008
GPS Interface
The C24's integrated GPS receiver can provide location and position information based on the
Global Positioning System satellites.
The GPS interface supports the following modes of operation:
•
Autonomous - In this mode the GPS receiver operates stand alone, regardless of CDMA
network availability.
The C24 searches and detects available satellites, and calculates the positioning information
on its own.
•
Assisted - In this mode the C24 operates in conjunction with the CDMA network to search
for satellites and calculate the positioning data.
•
MS Assisted - The calculation is performed by the network and the position is send to the
C24 device.
•
MS Based - C24 receive initial satellites information form the network and calculatse the
position by itself.
Number of satellites:
2D - When the GPS receiver is using three satellites to determine a position solution.
3D - When the GPS receiver is using four or more satellites to determine a position solution and
the accurate time.
Serial Configuration:
The C24 has two modes of data: Binary and NMEA.
Binary Mode is reported through UART1 or USB while the NMEA is through UART2 and USB.
Accuracy:
The accuracy must be less than 50 meters 67% of the time, and 150 meters 95% of the time.
Table 2-21 gives the GPS Receiver Specifications.
Table 2-21: GPS Receiver Specifications
Parameter Conditions Typ Unit
Receiver Sensitivity -155 dBm
TTFF
Autonomous Cold Start
Warm Start XX = 7.5
YY = 10 Min
Sec
TTFF
Assisted Cold Start
Warm Start XX = 8
YY = 3 Sec