Specifications

VP ONCORE COMMAND REFERENCE
8 CHANNEL TIME RAIM SETUP AND STATUS
MESSAGE (@@En)
continued
than 99.99%, which corresponds to less than one missed detection per
every 10,000 failures. Given the infrequency of GPS satellite failures, this
makes a missed detection virtually impossible. The probability of a false
alarm is less than 2.e-4%, which corresponds to less than one false
alarm every 5.7 days. Given that lock is maintained on eight satellites,
the time alarm can be set as low as 300 ns without compromising perfor-
mance.
* The minimum time required false alarm rate of 2.e-4% cannot be
achieved for this time alarm range.
The 8 Channel Time RAIM Setup and Status Message outputs the status
of the Time RAIM solution when the algorithm is on. This message also
outputs several values relating to the Time RAIM solution.
The receiver can make an estimate of the overall accuracy of the time
solution. The one-sigma accuracy estimate is computed using the
residuals of the least-squares time solution. This number is a measure of
the spread of the observations, not an estimate of the absolute time
accuracy.
The underlying noise due to the granularity of the clock generating the
1PPS signal is deterministic on every pulse. The receiver computes and
outputs the negative sawtooth residual so that the user can compensate
for the error and remove granularity.
Finally, the time solution of each individual satellite is output.
Default values: Time RAIM algorithm: Off
Time RAIM alarm limit: 1000 ns
1PPS control mode : setting 1
139 Synergy Systems, LLC 05OCT01