Ping DSP – Evaluation of Shallow Water Bathymetry and Object
Detection Capability. (12404) |
| Sebastian Botsyo, Timothy Scott and Kenneth Kingston (United Kingdom) |
Mr Sebastian Botsyo
Hydrographic Surveyor
University of Plymouth
Plymouth
United Kingdom
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| Corresponding author Mr Sebastian Botsyo (email: kwasisesebot[at]gmail.com, tel.: 07752446956) |
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| [ abstract ] [ paper ] [ handouts ] |
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Published on the web 2024-02-28
Received 2023-10-02 / Accepted n/a |
| This paper is one of selection of papers published for the FIG Working Week 2024 in Accra, Ghana in Accra, Ghana and has undergone the FIG Peer Review Process. |
FIG Working Week 2024 in Accra, Ghana
ISBN n/a ISSN 2307-4086
URL n/a
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Abstract |
| Phase Differencing Bathymetry Sonars (PDBS) are the most recent advancement in technology that combine SSS and MBES functions into a single sonar system that is capable of imaging and mapping the seafloor. The Ping DSP's 3DSS-IDX-450 is one of the advanced PDBS. The basic idea behind interferometry is to directly estimate the angle of arrival of an incoming plane wave as a range function using the differential phase across the array elements. The recently developed CAATI algorithm integrated in the 3DSS-IDX-450 determines numerous plane wave arrival angles and amplitudes from the backscatter data collected using a tiny linear array. The 3DSS-IDX-450 from Ping DSP was purchased by the Royal Navy for use in ASV/USV and AUV operations, shallow water mapping and imaging (bathymetry and object detection), and other naval operations especially ASV/USV and AUVs surveys.
Bathymetric uncertainty and object detection tests were conducted at Cawsand Bay (a suitable area for reference surface analysis with an existing pre-calibrated 0.5m cube). Both systems achieved the
standard of IHO Order 1a for bathymetric uncertainty. However, the 3DSS-IDX-450 performed
comparatively less accurate at the nadir.
The error of the nadir performance of the 3DSS-IDX-450 was 0.428m (M.B. data) and 0.513m (3D data) compared to 0.306m of the Norbit iWBMS at its nadir. The 3DSS-IDX-450 did not meet the overall IHO Special Order because its bathymetric ability deteriorated quickly with high uncertainty on the outer beams above 140⁰ (32m range) in shallow water. It, however, performed better in the middle from 20⁰-140⁰. The Norbit iWBMS performed better in the outer beams, up to about 155⁰. The overall depth uncertainty for Norbit iWBMS was 0.042m and 0.11m (95% c.l.) for 3DSS-IDX-450.
During this testing, the 3DSSTM Sonar could effectively detect seabed targets in shallow water (2 –
6.5m depth below CD). The 3DSS-IDX-450 Sonar was highly efficient (100%) in distinguishing the midwater target, including the mooring cable and the anchor, which is one of its primary capabilities.
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| Keywords: Hydrography; GNSS/GPS; Positioning; Interferometry; backscatter; object detection |
