User's Manual

V3d Product Specification, Version 2.06
3.5 GPS Receiver
3.5.1 Time to First Fix
The GPS receiver shall take no longer than 45 seconds (95%) to get a position fix from a warm
start (i.e., almanac loaded and more than two hours since the last fix) and no longer than 15
seconds (95%) from a hot start (i.e., less than two hours since the last fix).
3.5.2 Position Accuracy
The selected GPS shall achieve Standard Positioning Service (SPS) accuracy: 95% of position
measurements within 13 meters of the true location.
3.5.3 Antenna Connection Status
The antenna status shall be sensed, either connected or open circuit, only during the attempt for
GPS fix
3.6 Data Storage and Logging
The V3d stores all sensor data in the form of Logging Records (refer to SPC GlobalTrak OTA
Protocol Specification document) to non-volatile memory at a programmable interval (the
“Logging Interval”) as well as any alarms. The logs contain peak sensor data over the logging
interval along with a time stamp. The alarm logs contain the sensor data at the time of the
alarm with a time stamp.
3.6.1 Log Storage Capacity
The V3d shall allow for the storage of up to 1 MB (megabyte) of sensor data in non-volatile
memory.
3.6.2 Log Storage Viewing
The V3d shall allow for viewing of the Logging Record storage, initiated by command over the
main serial port.
3.6.3 Log Storage Clearing
The V3d shall allow for clearing of the Logging Record storage, initiated by command over the
main serial port.
3.7 Power Source
3.7.1 Battery Types
The main V3d power source is an internal battery, capable of sourcing sufficient pulse current
for RF transmission with output voltage not less than 9V (even during RF transmission) and not
more than 16V. Three battery types are to be used, selected based on application constraints:
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