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Contact

Sonar data…

Mary Ann captured this contact during mission 001A in the northwest quadrant of box 1A on 15-Feb-09. It was initially designated Contact 2. After further analysis, it was upgraded to Target 1.

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Contact 2: 600m range - 75kHz frequency (highlighted)

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Contact 2: 600m range - 75kHz frequency (magnified)

Contact Report

Assessment Criteria

1

2

3

4

5

Reflectivity: returned signal strength, relative and perceived

X

Overall dimensions: size

X

Overall geometry: shape

X

Associated bottom: debris field

X

Associated bottom: surrounding geology

X

Man-made versus natural: straight lines, perfect circles

X

Contact Location: Box 1A

Overall Rating: 3.2 / 5

Comments:
Overall size of area is consistent at around 20m x 20m for the plane if broken apart into pieces. Straight lines are not in line with the associated geology, making it look more man-made. While there are areas of reflectivity there is not an overall high level of intensity or reflectivity expected for the contact.

In addition, this target was very close to the next mission line in box 2A so we decided it was a perfect contact to re-image and test out the re-imaging methods and AUV program for such. This will ensure for proper overlap, navigation accuracy and camera operation.

Go to Re-Imaging…

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Re-Imaging

Re-Imaging Results…

Sonar
There is no high resolution sonar image for this contact because of a problem in the system start-up process that turned off the recording function.

Photography
The target turned out to be a series of flat volcanic shale-like rocks with some exposed sharp and straight edges. These gave the appearance of straight hard returns on the sonar record. They are located just off and adjacent to a long ridge line that was seen on the 600m range scale record. This type of rock will most likely be common in this area and we can expect to see more of this type of target. While we cannot discount everything that looks like this on the sonar record it does give us some experience with how the sonar will image these types of formations.

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Target 1 - Rock formation 5,389 meters deep

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Target 1 - Rock formation 5,389 deep