GAPS - User Guide
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This is typically when GAPS is held by a rope. In that case, the height value (h) must also be
set to 0 (to avoid the calculation of the offset). The accuracy of the positioning decreases if the
position of GAPS relative to the GPS antenna changes.
Figure 27 - Vertical GPS antenna lever arm
3.4.3.2 GPS Antenna not above GAPS
When the GPS antenna is not located right above GAPS, its position in the CRP / GAPS
frame has to be determined. The definition of these lever arms, LV1, LV2 and LV3 are given in
below.
Figure 28 - GPS antenna lever arms (antenna not above GAPS)
The closer GAPS is to the GPS, the better is the accuracy of the measurement of the heading
of the acoustic array.
The required precision on the lever arm is below 10 cm.
MU-GAPS-AN-005-H - November 2019 45
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