Type 8221, 8212, 8142 & 8091 HPT
Type 8182 HPT Modems
HPT Variants
UM-8142
Issue B Rev 1
Appendix D – Acoustic Navigation Principles 86
The array of seabed transponders needs to be calibrated and there are several techniques to do
this. The applicable technique depends on the requirements of the task or job and the available
hardware.
With the continuing integration of LBL, SBL and USBL systems, intelligent transponders (that
measure baselines directly) and satellite navigation systems, the calibration of seabed arrays is
becoming a quick and simple operation. The operator will be free to choose the techniques
applicable to the task requirements.
Figure D-1 LBL System
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