H220 Integrator Guide Appendix B-Troubleshooting Page B4
Table B-1: Troubleshooting (continued)
Issue Possible Solution
No heading or incorrect
heading values
Ensure the antennas are connected to the proper ports:
J1000 and J2000 are for the primary and secondary
antennas.
Heading is from primary to secondary antenna, so the
secondary antenna should be toward the bow and
primary toward the stern.
Check the measurement of the antenna separation.
The Measured (MSEP) and Calculated (CSEP) values
are in meters and should agree to within 1 cm. CSEP
continuously changes, so average this reading over
several minutes to obtain an approximate value.
Check CSEP value is fairly constant without varying
more than 1 cm. Larger variations may indicate a high
multipath environment and require moving the antenna
locations.
Reduce antenna separation - Hemisphere GNSS
recommends that the separation between the antennas
remain below 5 m for accurate and timely heading
reading output
$JATT,SEARCH command forces the H220 to acquire a
new heading solution. This should also be used after
entering a new MSEP value
$JATT, GYROAID, YES Enable gyro aid as this will give
heading for up to 3 minutes in times of GNSS signal loss
Enable tilt aid to reduce heading search times
Check the applications receiver using the $JAPP query;
the receiver should answer $JAPP, MFAATT, 1,2
Monitor the number of satellites and SNR values for both
antennas within SLXMON; at least 3 satellites should
have SNR values > 20
Antenna connectors should both be facing the same
direction
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