Interferometric Measurements with Wideband Signal Processing Techniques

Sewada, Jitendra Singh; Ioana, Cornel; Geen, Matt; Mars, Jérôme

doi:10.1109/oceanse.2019.8867232

Cited by 3 publications

(3 citation statements)

References 7 publications

(3 reference statements)

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“…The proposed method has higher coverage efficiency than lawnmower path during the early stage, and has the potential to achieve higher overall coverage efficiency by choosing proper weights. (5) Low coverage rate map obtained by the proposed method is more suitable for interpolation than that obtained by lawnmower surveys or spiral surveys. (6) The parameters of the proposed method can be adjusted under different mission goals.…”

Section: Discussionmentioning

confidence: 97%

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A Data-Driven Intermittent Online Coverage Path Planning Method for AUV-Based Bathymetric Mapping

Shi

Zhou

2020

Applied Sciences

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Bathymetric mapping with Autonomous Underwater Vehicles (AUVs) receives increased attentions in recent years. AUVs offer a lower operational cost and smaller carbon footprint with reduced ship usage, and they can provide higher resolution data when surveying the seabed at a closer distance if compared to ships. However, advancements are still needed to improve the data quality of AUV-based surveys. Unlike mobile robots with deterministic mapping performance, multibeam sonars used in AUV-based bathymetric mapping often yields inconsistent swath width due to the varied seabed elevation and surficial properties. As a result, mapping voids may exist between planned lawnmower transects. Although this could be solved by planning closer lawnmower paths, mission time increases proportionally. Therefore, an onboard path planner is demanded to assure the defined survey objective, i.e., coverage rate. Here in this paper, we present a new data-driven coverage path planning (CPP) method, in which the vehicle automatically updates the waypoints intermittently based on an objective function constructed using the information about the exploration preference, sonar performance, and coverage efficiency. The goal of the proposed method is to plan a cost-effective path on-the-fly to obtain high quality mapping result meeting the requirements in coverage rate and uncertainty. The proposed CPP method has been evaluated in a simulated environment with a 6DOF REMUS AUV model and a realistic seafloor topography. A series of trials has been conducted to investigate the performance affected by the parameters in the objective function. We also compared the proposed method with traditional lawnmower and spiral paths. The results show that the weight assignment in the objective function is critical as they affect the overall survey performance. With proper weight settings, the AUV yields better survey performance, coverage rate and coverage efficiency, compared to traditional approaches. Moreover, the proposed method can be easily adjusted or modified to achieve different coverage goals, such as rapid data gathering of the entire region, survey of irregular workspace, or maintaining real time path planning.

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Section: Discussionmentioning

confidence: 97%

“…Interferometric sonars are special side-scan sonars which can produce bathymetry image through differential phase technique. However, they require sophisticated signal processing algorithms to get a satisfied result [5].…”

Section: Introductionmentioning

confidence: 99%

A Data-Driven Intermittent Online Coverage Path Planning Method for AUV-Based Bathymetric Mapping

Shi

Zhou

2020

Applied Sciences

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“…Range and accuracy can also be improved by increasing the pulse length, but this also lowers the spatial resolution of the bottom image. A remedy to this range-resolution trade-off might be the application of FM pulses and matched filter processing [34][35][36]. The application of FM pulses lowers the impact of the shifting footprint.…”

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confidence: 99%

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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Assessing the Performance of the Phase Difference Bathymetric Sonar Depth Uncertainty Prediction Model

Mohammadloo

Geen²,

Sewada³

et al. 2022

Remote Sensing

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Realistic predictions of the contribution of the uncertainty sources affecting the quality of the bathymetric measurements prior to a survey is of importance. To this end, models predicting these contributions have been developed. The objective of the present paper is to assess the performance of the bathymetric uncertainty prediction model for Phase Difference Bathymetric Sonars (PDBS) which is an interferometric sonar. Two data sets were acquired with the Bathyswath-2 system with a frequency of 234 kHz at average water depths of around 26 m and 8 m with pulse lengths equal to 0.0555 ms and 0.1581 ms, respectively. The comparison between the bathymetric uncertainties derived from the measurements and those predicted using the current model indicates a relatively good agreement except for the across-track distances close to the nadir. The performance of the prediction model can be improved by modifying the term addressing the effect of footprint shift, i.e., spatial decorrelation, on the bottom due to fact that at a given time the footprints seen by different receiving arrays are slightly different.

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Interferometric Measurements with Wideband Signal Processing Techniques

Cited by 3 publications

References 7 publications

A Data-Driven Intermittent Online Coverage Path Planning Method for AUV-Based Bathymetric Mapping

A Data-Driven Intermittent Online Coverage Path Planning Method for AUV-Based Bathymetric Mapping

Direction-of-Arrival Estimation Methods in Interferometric Echo Sounding

Assessing the Performance of the Phase Difference Bathymetric Sonar Depth Uncertainty Prediction Model

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