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997-01530-01, Rev. C-25, Jan 2008 109
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6: GPS M12 Receiver (87-8028-2)
Introduction
The optional GPS M12 Receiver acts as a Stratum 0 timing reference source to the XL-GPS Time and
Frequency System. It tracks up to 12 L1 GPS satellites, decodes their signals for time and position, and
feeds this data to the XL-GPS through the internal backplane. When available and enabled, the GPS
M12 Receiver card provides superior time and frequency accuracy on the XL-GPS (See “
Time and
Frequency Accuracy” on page 3). The GPS M12 Receiver card comes with an L1 GPS antenna, cabling,
and mounting hardware unless otherwise specified at the time of purchase.
The GPS M12 Receiver uses a TRAIM (Time Receiver Autonomous Integrity Monitoring) algorithm to
monitor the integrity of the receiver’s timing solution. Using redundant measurements, TRAIM detects
and quarantines anomalous GPS signals, independent of the GPS health ephemeris data. The
quarantined signal is excluded from the timing solution for 12 hours before it is requalified for inclusion in
the timing solution.
For more information about the M12 receiver, visit http://www.motorola.com/ies/GPS/
products_positioning.html.
See “
Installing the GPS Antenna” on page 13 for information on selecting an antenna site, mounting the
antenna, and signal strength requirements.
The GPS M12 Receiver card can be managed and configured using F53 – GPS Operation
Mode (page 55) and F119 – GPS Receiver Configuration (page 104).
Specifications
Related topics:
•
“Installing the GPS Antenna” on page 13
• “Verifying Antenna Installation” on page 22
• “F50 – GPS Receiver LLA/XYZ Position” on page 49
Frequency 1575.42 MHz (L1 signal)
Code Coarse Acquisition (C/A) code
Tracking Up to 12 satellites with TRAIM
Position Accuracy Typically < 10m when tracking four (4) satellites
TRAIM Mask 1 μS
1 PPS Accuracy UTC-USNO ±30 nS RMS 100 nS Peak
Time standard: UTC or GPS
Antenna input Female BNC
Antenna Power 20 mA – 220 mA, +12 V