Chapter 3 – Receiver Description
Motorola GPS Products - Oncore User’s Guide
System Integration ................................................................................................................3.32
Interface Protocol .................................................................................................................3.32
TTL Output...............................................................................................................................3.33
Motorola Binary Format .......................................................................................3.34
NMEA Support.......................................................................................................3.37
RTCM Differential GPS Support..........................................................................3.38
EXCLUSIVE-OR Checksum Creation...................................................................................3.39
Millisecond To Degree Conversion ....................................................................................3.40
Input/Output Processing Time.............................................................................................3.41
DATA Latency ........................................................................................................................3.42
Position DATA Latency.........................................................................................3.44
Velocity DATA Latency.........................................................................................3.44
Time DATA Latency ..............................................................................................3.44
One Pulse Per Second (1PPS) Timing................................................................................3.44
Measurement Epoch Timing ...............................................................................3.44
Output Data Timing Relative To Measurement Epoch....................................3.45
1PPS Cable Delay and 1PPS OfFset (M12 Timing and UT Model Only)........3.46
Operational Considerations .................................................................................................3.47
First Time On ..........................................................................................................3.47
Initialization ............................................................................................................3.48
Shut Down ..............................................................................................................3.48
Keep Alive Power..................................................................................................3.48
Rollovers In Time ...................................................................................................................3.49
Received Carrier To Noise Density Ratio (C/NO) .............................................................3.50
Revision 5.0 08/30/02
3.3
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