Operating Manual

Accu-Wave Chapter 5 Radar Fine Tuning
TN Technologies 5-21
Tank Map Setup
Tank mapping is used to map an empty tank for the physical targets such as ladders,
beams, baffles, etc. Use Region Weighting Setup if the reflections from an agitator blade
need to be mitigated. When tank map data is collected, the gauge can map up to 12 echoes.
Note: When the map empty tank command is executed, the number of mapped
echoes will be limited to the echo candidates (echo report) which have a
reported echo distance less than the mapped distance.
The gauge collects the following parameters for each of the mapped echoes:
• distance from REF LINE to echo
• signal strength
• quality factor (Q1)
If tank mapping is enabled, the gauge will compare the echo report to the mapped echoes
for a possible “hit(s).” To be considered a “hit,” the candidate echo must meet the
following three criteria.
5. The distance to the echo must be within a user-entered window of one of the
mapped echoes (default is 1% of maximum distance).
Note: The distance comparison is performed less significantly than the values
displayed in the echo reports meaning this tolerance window is an
approximate window size.
6. If an echo meets the first criteria, the quality factor of the echo candidate is
compared to the quality factor of the corresponding mapped echo. The quality
factors must be within a user-entered tolerance (default is a tolerance of 32).
7. If an echo meets the first criteria, the signal strength of the echo candidate is
compared to the signal strength of the corresponding mapped echo. The signal
strength readings must be within a factor of 2 (0.5 to 2.0). The user cannot modify
this tolerance.
An echo that is considered a hit (meaning the report echo met all three of the ‘hit’ criteria)
can either be ignored or derated by a weighting factor. The default is to ignore all hits. If
you choose to derate all hits, you can enter a “map echo weighting” factor. The default
value for this weighting factor is 0.05.
The user has one additional option, “Do” or “Do not” allow echoes shorter than the
farthest mapped hit. The default is “Do not” meaning any echo candidate closer than the
farthest mapped hit will not be chosen unless there are no other possible candidates.