Measuring Bathymetric Uncertainty of the EdgeTech 4600 Sonar

Hiller, Thomas; Brisson, Lisa N.; Wright, Steve

doi:10.3990/2.241

Cited by 5 publications

(6 citation statements)

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“…35) and is due to the bathymetric uncertainty of the sonar systems. 31,35,36 We note that the classification is not hampered by this effect as the angular change in the depth residual values has been accounted for in the standardization procedure of Sec. III A.…”

Section: A Closer Inspection Of the Depth Residual Valuesmentioning

confidence: 98%

Observations regarding coarse sediment classification based on multi-beam echo-sounder's backscatter strength and depth residuals in Dutch rivers

Eleftherakis

Snellen

Amiri-Simkooei

et al. 2014

The Journal of the Acoustical Society of America

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This contribution investigates the behavior of two important riverbed sediment classifiers, derived from multi-beam echo-sounder (MBES)-operating at 300 kHz-data, in very coarse sediment environments. These are the backscatter strength and the depth residuals. Four MBES data sets collected at different parts of rivers in the Netherlands are employed. From previous research the backscatter strength was found to increase for increasing mean grain sizes. Depth residuals, however, are often found to have lower values for coarser sediments. Investigation of the four data sets indicates that these statements are valid only for moderately coarse sediment such as sand. For very coarse sediments (e.g., coarse gravel) the backscatter strength is found to decrease and the depth residuals increase for increasing mean grain sizes. This is observed when the sediment mean grain size becomes significantly larger than the acoustic wavelength of the MBES (5 mm). Knowledge regarding this behavior is of high importance when using backscatter strength and depth residuals for sediment classification purposes as the reverse in behavior can induce ambiguity in the classification.

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Section: A Closer Inspection Of the Depth Residual Valuesmentioning

confidence: 98%

Observations regarding coarse sediment classification based on multi-beam echo-sounder's backscatter strength and depth residuals in Dutch rivers

Eleftherakis

Snellen

Amiri-Simkooei

et al. 2014

The Journal of the Acoustical Society of America

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“…In the mid 1990s, the IES reached a level of advancement that allowed it to be offered as a complete, off-the-shelf solution. At the beginning of the current millennium, the interferometric echo sounder started to be a viable alternative to the MBES [7]. Its angular coverage is usually greater than that of the MBES, which makes it more effective in shallow waters.…”

Section: Classical Interferometrymentioning

confidence: 99%

“…MPDI may be directly attached to the hull of the survey vessel, which improves positioning accuracy, as the layback calculation system is no longer necessary. Currently, MPDI is capable of fulfilling the most stringent accuracy requirements and can provide real-time data [6,7,27]. Some of the systems struggle, however, with poor data in the nadir zone or no data at all in this direction.…”

Section: Multi-phase Difference Interferometrymentioning

confidence: 99%

“…Currently, many MPDI systems fulfill hydrographic survey accuracy requirements and are treated as equivalent to the MBES, especially in shallow waters applications [7,27]. However, there are still grounds for further research.…”

Section: Current Research Reviewmentioning

confidence: 99%

“…The interferometric echo sounder (IES). echo sounder started to be a viable alternative to the MBES [7]. Its angular coverage is usually greater than that of the MBES, which makes it more effective in shallow waters.…”

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confidence: 99%

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Direction-of-Arrival Estimation Methods in Interferometric Echo Sounding

Grall

Kochańska

Marszal

2020

Sensors

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Nowadays, there are two leading sea sounding technologies: the multibeam echo sounder and the multiphase echo sounder (also known as phase-difference side scan sonar or bathymetric side scan sonar). Both solutions have their advantages and disadvantages, and they can be perceived as complementary to each other. The article reviews the development of interferometric echo sounding array configurations and the various methods applied to determine the direction-of-arrival. “Interferometric echo sounder” is a broad term, applied to various devices that primarily utilize phase difference measurements to estimate the direction-of-arrival. The article focuses on modifications to the interferometric sonar array that have led to the state-of-the-art multiphase echo sounder. The main algorithms for classical and modern interferometric echo sounder direction-of-arrival estimation are also outlined. The accuracy of direction-of-arrival estimation methods is dependent on the configuration of the array and external and internal noise sources. The main sources of errors, which influence the accuracy of the phase difference measurements, are also briefly characterized. The article ends with a review of the current research into improvements in the accuracy of interferometric echo sounding and the application of the principle of interferometric in other devices.

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