Seafloor Imagery - Sidescan and Backscatter

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Across track range resolution Why sonars work better at the outer ranges Distinguishing two independent objects can be referred to as the sonar resolution. If two objects are too close, they will appear as one on the sidescan record. Getting these objects further apart will show them as independent objects. How close can they be Half the pulse length. Example: A 500khz system has a pulse length of 1 cm. In practice, that won’t be seen, <strong>and</strong> cannot distinguish an object that close. We can approach this value further away from nadir. The footprint of sonar (arriving energy) is longer near nadir due to the angle of incident. Conversely, the further away, the more the bottom footprint approaches the pulse length. At the very far end of the signal, the best resolution would be obtained First return
Along track resolution why objects in the far field cannot be distinguished The resolution in the along track direction is dependent on the sonar Horizontal beam width. The image below represents what happens when targets in the far field are inside the angular resolution of the sonar. They become indistinguishable <strong>and</strong> look as a single object At the near field, these objects can be distinguished. Horizontal beam width First return
Page 1 and 2: Seafloor Imagery Sidescan and Backs
Page 3 and 4: Sidescan systems - why use them •
Page 5 and 6: Sidescan types Sidescan frequency
Page 7 and 8: What to do with Side Scan data Mosa
Page 9 and 10: Sonar system components • The son
Page 11 and 12: Sidescan positioning Getting the po
Page 13 and 14: Operating a fixed mount (on survey
Page 15: Sidescan Resolution
Page 19 and 20: How to do a self check of object de
Page 21 and 22: Backscatter How we see images on th
Page 23 and 24: Sidescan data collection
Page 25 and 26: Data collection in HYPACK Two progr
Page 27 and 28: Setting up a Sidescan Device In Sid
Page 29 and 30: Survey planning: 100% and 200% cove
Page 31 and 32: Sidescan TOOLS Many sidescan system
Page 33 and 34: Maintaining a Proper Bottom Track i
Page 35 and 36: The target height may not be exact
Page 37 and 38: Sidescan Mosaic Processes Stage 1:
Page 39 and 40: Sidescan Mosaic Processes Stage 3:
Page 41 and 42: Sidescan Controls Adjustments Righ
Page 43 and 44: Sidescan Controls Adjustments Gains
Page 45 and 46: Targeting: Example
Page 47 and 48: Target Viewer and Classification U
Page 49 and 50: Resolution Calculator Determine the
Page 51 and 52: Using Coverage Map to manage target
Page 53 and 54: Sidescan Interpretation
Page 55 and 56: The Shadow Effect Imaging the seafl
Page 57 and 58: Proving the chart is wrong On the c
Page 59 and 60: Sidescan for bottom classification
Page 61 and 62: GEOCODER Data Flow Side Scan Data F
Page 63 and 64: Remosaicing Users can remosaic enti
Page 65 and 66: Bottom Classification: Extracting t
Page 67 and 68:
Output ARA results to DXF Export AR
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Seafloor Imagery - Sidescan and Backscatter

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