User manual

Table Of Contents
MMPUnpacker.INI Configuration Options
SkipToPreview Set to 1 (TRUE) if NEXT button on initial
screen goes directly to preview step and skips
all the intermediate steps.
0 (FALSE)
This key is never
written back to the
Unpacker code and
will not permanently
change the Unpacker
Wizard.
The PDP-N_NN Utility Program
To unpack data and translate binary files to ASCII text for MMP Firmware versions
below 3.01, the utility program PDP-N_NN is included with the firmware. For more information
about this tool, see Appendix K in this User Manual.
Processing and Interpreting MMP Data
The section below includes an example of interpreting MMP data after it is unpacked to
ASCII text format. This example analysis includes:
Mapping the raw acoustic path velocity measurements logged in the ACM data
files to velocities in the local Cartesian earth frame.
Synchronizing the sensor data streams to a common clock.
Mapping Velocity Measurements
To map raw acoustic path velocity measurements, the ACM is calibrated using several
steps:
Step 1 – Map horizontal compass measurements to the unit circle
Step 2 – Plot raw measurements
Step 3 – Adjust parameters (Vector Averaging, or Non-linear Optimization)
Step 4 – Conduct a spin test
Step 5 – Remove the bias angle
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