Gps Interface; Gps Receiver Specifications - Motorola 8900 - Blackberry Curve Cell Phone OEM Car Charger Developer's Manual

GPS Interface

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.
•
•
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
44
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.
gives the GPS Receiver Specifications.
Table 2-21: GPS Receiver Specifications
Parameter
Receiver Sensitivity
TTFF
Autonomous
TTFF
Assisted
C24 Module Hardware Description
Conditions
Cold Start
Warm Start
Cold Start
Warm Start
Typ Unit
-155 dBm
XX = 7.5 Min
YY = 10 Sec
XX = 8 Sec
YY = 3
December 15, 2008