4 – Operating Procedure
4-6
© Teledyne Limited
DPN 402197 Issue 7.1
6.
Check the 350 system.
After you recover the ROV, perform all the post-survey checks and make any necessary
repairs to the 350 system before you store it. This helps to ensure the system will be ready for
immediate deployment when needed again. Use a fresh water hose to wash deposits of salt
and debris off the system.
4.5 Data Formats
4.5.1 External Logging Format
The output from DeepView to a data logger includes a Quality Control flag and identification codes
generated by the 350 system. Post-processing engineers can use this additional information to modify
the plot of the target profile to identify areas where the flag is set.
NOTE
The quality control flag does NOT mean that the measurements contain errors. It
merely indicates to the post-processing team that the vertical range to target or
the lateral offset has exceeded pre-defined limits. The post-processing engineers
can use this flag to help them analyse the acquired data more easily.
4.5.1.1 Co-ordinates and Signals Format
In survey mode, the following sentence is transmitted.
Table 4-1: External Output format - Survey Mode
Notes:
1. The Start character is a colon – ASCII 3Ah.
2. ‘S’ (ASCII 60h) identifies survey mode packet.
3. The Quality Control (QC) flag will be a space character when RESET, or a question mark (? –
ASCII 3Fh) if set. See also the QC code later in this packet.
4. The lateral offset (LAT) is measured from the centre of the coil array. Positive values indicate a
target to starboard of the centre line. The field will contain question marks if the target is out of
range.
5. The vertical range to target (VRT) is the distance between the centre line of the coil array and
the target. There are several conditions that will cause the field to contain question marks:
:SQ±LLLL VVVV AAAA±CCCC±SSS 1111 2222 3333 4444 5555 6666 QQ[CR][LF]
Start
character
(Note
1)
Packet
identifier
(Note
2)
Space
character
Space
character
Space
character
Space
character
Space
character
Space
character
Space
character
Space
character
Space
character
QC
check
code
(Note
10)
Lateral
of
fset
(Note
4)
V
ertical
range
to
target
(Note
5)
Coil
altitude
(Note
6)
Target
depth
of
cover
(Note
7)
Skew
angle
(Note
8)
Signal
strength
on
channel
1
(Note
9)
Signal
strength
on
channel
2
(Note
9)
Signal
strength
on
channel
3
(Note
9)
Signal
strength
on
channel
4
(Note
9)
Signal
strength
on
channel
5
(Note
9)
Signal
strength
on
channel
6
(Note
9)
Carriage
return
line-feed
termination
QC
flag
(Note
3)