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350 Cable Survey System

DPN 402197 © TSS (International) Ltd Page 10 of 32

When the 350 System includes a properly configured altimeter, the top edge K of the

solid grey area shows the position of the seabed relative to the coil array. This area

expands and contracts vertically with changes in ROV altitude above the seabed. If

the design of the ROV allows you to configure the 350 System with a fixed coil height,

the seabed indicator will remain fixed at this altitude.

The Run Window includes a series of data fields L that indicate the instantaneous

measurements of coil altitude (ALT) above the seabed, lateral offset (LAT) of the tar-

get relative to the centre line, vertical range to the target (VRT) and target depth of

cover (COV). The 350 System measures VRT and LAT directly, with positive meas-

urements of LAT representing a starboard offset relative to the centre line. Measure-

ments of ALT arrive from an altimeter, or represent the fixed coil height if this is

applicable. DeepView calculates the value displayed in the COV field using COV =

VRT–ALT so that positive values indicate a target that is buried. All measurement are

in units of centimetres.

The solid white line M that separates the rear elevation pane from the ‘snail trail’ pane

(described below) has gradations every 1m or 5m, depending on the swath width.

Two broken red lines N extend down the window at ±2m of lateral offset. These show

the lateral limits of a quality control envelope applied by DeepView. To support effi-

cient post-processing on data acquired by the 350 System, the software sets the

quality control flag in the data output when the target is outside this envelope. Refer to

sub-section 6.5 for a complete description of the quality control features.

Features – ‘Snail Trail’ pane

The snail trail pane is immediately below the rear elevation pane and occupies

approximately 60% of the screen area with the window fully maximised. It has a dark

blue background and indicates the lateral offset of the target, relative to the ROV cen-

tre line H, for the most recent updates.

Two data panels R and S show the received signal voltages. In Run mode, the volt-

ages shown are measured simultaneously on the port vertical (PV), port lateral (PL),

starboard vertical (SV) and starboard lateral (SL) coils. The digital display panel S

uses scientific notation to display the signal voltages in units of microvolts (µV). The

bargraphs R use a logarithmic scale. The use of scientific notation and log. scales

allows strong and weak signals to be displayed simultaneously without the need to

change scale.

The red dotted lines on R show the threshold (section 6.1.1.2); on the drawing this is

the default setting of 100µV. When the signal falls below the threshold value, the bar-

graph turns red.

Panel O displays the SEP details, System Clock, System Errors, External Output,

Internal log status. Panel P shows the skew of the vehicle (the heading relative to the

cable).

A thick coloured line Q indicates the target position relative to the ROV centre line. As

the survey starts, this line extends upwards from the bottom of the screen until it

reaches a point near the top of the snail trail pane. The top of the line then continues

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