IMAGENEX DT101Xi, Technical Manual

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Doc no: 430-041-01 7 of 64
2. System Description
2.1. Introduction
Both the DT101
Xi
and DT102
Xi
are beamforming multibeam echosounders (MBES) with optional internally
integrated motion reference unit (MRU) and sound velocity sensor (SVS). The DT101
Xi
is a 120° X 3° system
while the DT102
Xi
is a 180° X 3° system. Both DT101
Xi
and DT102
Xi
MBESs are a single instrument optionally
integrating the sonar, MRU and SVS into one sleek and compact unit. The DT101
Xi
and DT102
Xi
require one
cable for operating all three sensors and they are a portable solution for any survey. They are compatible
with the DT100 SIR (Sensor Interface Relay) power supply/timing box. Full specifications on both DT101
Xi
and DT102
Xi
are provided in APPENDIX A.
2.2. Operational Scenarios
A multibeam echosounder is a device that simultaneously acquires a multitude of depth measurements,
regularly spread athwart-ship, in a fan-shape pattern. The reason for using these sonars is to sweep a swath-
like corridor of the bottom so as to ensure a complete coverage of the seafloor.
Figure 2-1 Examples of MBES data acquired with a DT101
Xi
on a small survey vessel
MBESs (like the DT101
Xi
and DT 102
Xi
) can be mobilized on small and large vessels, Remotely Operated
Vehicles (ROV), Autonomous Underwater Vehicles (AUV), Unmanned Surface Vehicles (USV) and
Autonomous Surface Vehicles (ASV).
Since the mobilization onto autonomous, remotely controlled and unmanned vehicles is highly specialized
and very platform specific, this manual shall focus on mobilization onto smaller manned vessels only. The
content however does have relevance to more specialized craft.