Directed Electronics VS102 Betriebsanweisung PDF herunterladen (Seite 37)

Chapter 3: Operation

Hemisphere GPS’ GPS Technical Reference describes the commands and

methodology required to recalibrate, query, or change the sensors status.

Tilt Aiding

The V102’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

V102 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 considerably decreases startup and reacquisition times.

(See Figure 3-2)

Figure 3-2: V102’s tilt aiding

Gyro Aiding

The V102’s internal gyro offers several benefits. It reduces the sensor volume

for an RTK solution. This shortens reacquisition times when a GPS heading

Table 3-1: Sensor operation summary

Feature Normal Operation Coasting (no GPS)

Heading GPS Gyro

Heave GPS None

Pitch GPS Inertial sensor

Roll Inertial sensor Inertial sensor

Tilt angle

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 59 60

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Directed Electronics VS102 Betriebsanweisung Seite 37