Microsemi ATS-6501B T-Flex - GPS Not Tracking

DOC 6501_Release V
ATS-6501 Users Guide
107
6.2.3.2 GPS Not Tracking
This indictor will go out if the ATS-6501 is not tracking at least 4 GPS Satellites. The indicator
will also go out if the manually entered position is incorrect. If the position error is large enough
the indicator will turn red and the GPS receiver is unable to track properly depending on how
large the position error is. If the system is not tracking GPS for 30 or more minutes, the Alarm
indicator will turn red. Users can look at the GPS performance and look at the number of events
and the last time GPS was not tracking properly using the status gps command
ATS-6501>status gps
[mode]
[desc] not tracking
[value] 3
[model]
[hw_version] OEMV3G-4.00-X2T
[name] L12LV
[serial_number] DAB08190113
[sw_version] 3.400
[position]
[alt] 1.8410799999999998e+01
[fixed] true
[lat] 3.8466365580420003e+01
[lon] -7.7440877483110000e+01
[mode]
[enum] 0
[satellite]
[number] 0
[signal]
[avg] 0.0000000000000000e+00
[desc] Poor
[enum] 0
[freq] single
[max] 0.0000000000000000e+00
[min] 0.0000000000000000e+00
Note: If the system is reporting it is not tracking yet it shows it is tracking 4 or more satellites the
manually entered position may be incorrect. Verify the position settings and correct any errors.
If the position is not known or the error will not clear change the position_mode to auto and
resurvey the antenna position. This should clear the GPS Tracking Error. Users can obtain the
position information after the auto_hours (position_period) has expired by processing the RINEX
file.
Possible causes are:
• Poor antenna location (See 6.3.1)
• Mask Angle set improperly (See 6.3.1)
• Antenna Cable Failure
o Failed lightning protection device. If a lightning protection device has been installed
in the RF & DC path ensure the device has not failed and is not open (no continuity).
o Bad Cable. The cable may have failed due to exposure to the weather, kinking, or
bending. Inspect the antenna cable and correct any issues and replace any cables that
appear to be weathered.
o Improper Antenna Cable. The cable may be either too long or the improper type.
Microsemi recommends using low loss coaxial cables for the GPS antenna cable.