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Contact

Sonar data…

Contact 49 was acquired by Ginger during Mission 052B on 30-Apr-09 and upgraded to Target 4 after analysis.

Target49_600m_75khzbox.jpg

Contact 49 / Target 4: 600m range - 75kHz

Target49_600m_75khz-mag.jpg

Contact 49 / Target 4: 600m range - 75kHz frequency (magnified)

CONTACT REPORT

Contact Designation: #49

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 5C

Overall Rating: 3.5 / 5

Comments:
This target has relatively high reflectivity and no associated geology surrounding it. It is sitting in a benign area and stands out as not natural, which is its strongest characteristic. The size of the image measures approximately 8 meters long and 2 meters wide. While it does not match the general shape expectations or overall dimensions it does appear man-made and could be part of the aircraft. The location is close to the next sortie making it a short deviation to re-image.

See Re-Imaging…

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Re-Imaging

Re-Imaging Results…

Sonar

Target49_75m_410khzbox.jpg

Contact 49 / Target 4: 75m range - 410kHz frequency

Target49_75m_410khz-closemag.jpg

Contact 49 / Target 4: 75m range - 410kHz frequency (magnified)

Photography

targets-49-pixa.jpg

Target 4 - Metal drum 5,290 meters deep

Comments:
The photography shows this target was a drum measuring 0.6 meters wide by 1 meter tall. The original sonar image being stretched in the length track (causing the 8 meter measurement) can be attributed to two things. First, the AUVs have a continuous heading wobble of plus/minus .75 degrees and, second, the acoustic beam spreading through the water. These distortions increase with distance from the AUVs and this target was originally imaged 500 meters from the vehicle. We are working on the heading oscillation which was originally plus/minus 3 degrees but the acoustic beam spreading is unavoidable.

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