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Operation | HS80/MX575C/MX575D User Manual
cm centered on the location of the primary antenna (see Figure 3-1).
Primary Antenna
50 cm
Baseline
Figure 3-1: Secondary antenna’s search volume
¼ Note: The Smart GPS compass moving base station algorithm only uses GPS to calculate
heading. Differential corrections are not used in this calculation and will not affect heading
accuracy.
Supplemental sensors
The Smart GPS compass has three supplemental sensors (gyro and two tilt sensors) that are
integrated into the unit’s main PCB. The supplemental sensors are enabled by default. You
can enable/disable the gyro and both tilt sensors (you cannot enable/disable each tilt sensor
separately).
The sensors act to reduce the RTK search volume, which improves heading startup and re-
acquisition times. This improves the reliability and accuracy of selecting the correct heading
solution by eliminating other possible, erroneous solutions.
Sensor operation summary
Feature Normal Operation Coasting (no GPS)
Heading GPS Gyro
Heave GPS None
Pitch GPS Inertial tilt sensor
Roll Inertial sensor Inertial tilt sensor
Tilt aiding
The Smart GPS compass’s accelerometers (internal tilt sensors) are factory calibrated and
enabled by default. This constrains the RTK heading solution beyond the volume associated
with just a fixed antenna separation. This is because the Smart GPS compass knows the
approximate inclination of the secondary antenna with respect to the primary antenna. The
search space defined by the tilt sensor will be reduced to a horizontal ring on the sphere’s
surface by reducing the search volume.
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