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| NaviScan - Data Acquisition
Software |
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Applications
The NaviScan
software designed for vessel and ROV/AUV based marine surveys provides real-time
collection and display of data from multibeam echosounders, side scan sonars,
scanning and profiling sonars, pipe-trackers etc.
Device I/O
Drivers
NaviScan comprises device I/O drivers for interface of
multibeam echosounders, multibeam side scan backscatter imagery, pipe trackers,
side scan sonars, scanning and profiling sonar’s etc. Data are interfaced
through TCP/IP or any Windows NT/2000/XP supported I/O board. NaviScan allows
interfacing of multiple or redundant secondary sensors, which during data
editing allows for operator selected substitution of sensor data in case of
noise or drop-outs in one or more sensor data. If NaviScan is used with NaviPac
integrated navigation and data acquisition software start-of-line, stop-of-line
and file naming are controlled automatically on signal from NaviPac. |
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Data Acquisition and
Processing
NaviScan performs
data collection, time tagging, logging, data processing and display of data in
real-time environment. The data is processed for motion, refraction and tides
on-the-fly prior to displaying the data on monitor. Dedicated post-processing of
data can be performed using the NaviEdit software. Modelling and charting of the
edited survey data can be performed by use of NaviModel and NaviPlot,
respectively.
Display
NaviScan provides full graphical
sensor displays in scaleable windows comprising a/o raw data from Gyro, RPH
sensor, Bathy, Doppler Log, and Position. 3D graphical presentation of multibeam
echosounder scans is available as well as a graphical presentation of the
filtered positions. All graphical windows can be printed on any Windows
NT/2000/XP supported printer or plotter. |
High-level Applications
NaviScan features
series of high-level easy-to-use applications, which are specially designed for
complex survey environment. Set-up is a program in which the system
administrator sets up and maintains NaviScan by specifying the various sensors,
communication interfaces, vessel or ROV offsets and C-O values. Extract is a
simple data extractor, which allows export of data to spreadsheet, e.g. MS
Excel. Extract supports generation of ASCII files with center depth and attitude
data, position track (raw and filtered), Doppler data and pipetracker data with
raw and edited positions. Graphical dump allows for all graphical windows to be
printed on supported printer or plotter. |
Export
NaviScan provides
correction for offsets, heading, HRP, C-0, etc. All low-quality data is filtered
out during data processing, where tide tables and sound velocity profiles can
also be applied. Window filtering routines can be specified for removal of outer
and/or specific beams. During this process, the system creates a conversion log,
which gives the amount of discarded data. The collected data can be exported in
various standard formats, which allows access to the collected data through use
of 3rd party application software.
Side Scan Option
If the
multibeam echosounder supports side scan sonar imagery (backscatter), NaviScan
provides logging, correction and presentation the data. Data is presented as
colour-coded waterfall backscatter display. The system includes correction for
slant range and speed. During data collection and playback, targets in the side
scan image can be marked and stored in special target image files for analysing
during playback. |
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Contour Module
The Contour
module allows real-time generation of digital terrain models during data
collection. Presentation of colour-coded coverage plots provides monitoring of
overlay between actual and previous data as well as non-coverage areas. Besides
the average depth information Contour features graphical displays of min/max
depth, data density, and standard deviation. Contour also provides display of
contour curves specified by profiles (cross or longitudinal) defined by mouse
click and drag. 3D view of the data features facilities for sun illumination,
zoom & pan, perspective view setting, rotation and move around with close
real-time feeling. |
Patch Test Calibration
Module
The patch test
calibration module provides sophisticated patch tests based on Contour DTM for
calibration of errors caused by misalignment of the MB-transducer against the
vessel system (roll, pitch, heading and time (position delay)).
The patch test comprises features for calibration of Doppler Log, which based on
one or more data sets, compares raw positional track with Doppler/gyro track for
calculation of scale factor and rotation angle. |
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