Open-File Report 01-448 Patch Test

Cruise Report; RV Moana Wave cruise M1-01-GM; the bathymetry and acoustic backscatter of the mid shelf to upper slope off Panama City, Florida, northeastern Gulf of Mexico; September 3, through October 12, 2001, Panama City, FL to Panama City, FL

Patch Test

Despite the careful measurements of transducer alignments and offsets, the true geometry of the installed system can only be determined through the determination of the self-consistency of seafloor measurements. To facilitate such a determination, we conducted a series of "patch tests" the first day of the Northwest Florida shelf survey whereby the system was run back and forth across a seafloor feature to determine if there were residual roll, pitch, heading, or timing offsets that required correction factors.
A full patch test procedure was started prior to data collection on September 3 to calibrate any time delay, and gyro misalignment. The static adjustments were estimated from the patch test are listed in Table 5.

Table 5. Adjustments to shipboard alignments used for the Northwest Florida shelf survey for Legs 2 and 3.

Tme delay 0.4 s

Gyro misalignment 0.0°.

Roll misalignment 0.0°.

Pitch misalignment -0.0°.

The time delay was entered in to the UNB post-processing software.

The roll offset was entered into the Simrad software.

The gyro misalignment was entered into the Simrad OPU.

Pitch misalignment entered into Swathed post-processing software

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Suggested citation:

Gardner, James V., Mayer, Larry A., Hughes Clarke, John E., Dartnell, Peter, Sulak, Kenneth J., 2001, Cruise Report; RV Moana Wave cruise M1-01-GM; the bathymetry and acoustic backscatter of the mid shelf to upper slope off Panama City, Florida, northeastern Gulf of Mexico; September 3, through October 12, 2001, Panama City, FL to Panama City, FL: U.S. Geological Survey Open-File Report 01-448, https://pubs.usgs.gov/of/2001/0448/.

U.S. Department of the Interior
SALLY JEWELL, Secretary

U.S. Geological Survey
Suzette M. Kimball, Acting Director