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Operation | HS60 GPS Compass User Guide
Sensor operation summary
Feature Normal operation Coasting (no GPS)
Heading GPS Gyro
Pitch GPS Inertial sensor
Roll Inertial sensor Inertial sensor
Tilt aiding
The HS60’s accelerometers (internal tilt sensors) are factory-calibrat-
ed and enabled by default. This allows for a steady heading solution
beyond the volume associated with just a fixed antenna separation.
This is because the HS60 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. This consid-
erably decreases startup and reacquisition times.
HS60’s tilt aiding
Gyro aiding
The HS60’s internal gyro offers several benefits. It reduces the sensor
volume to shorten reacquisition times when a GPS heading is lost
because the satellite signals were blocked. The gyro provides a rela-
tive change in angle since the last computed heading, and, when
used in conjunction with the tilt sensor, defines the search space as
a wedge-shaped location - see next page.
Tilt angle
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