Ultra-short baseline acoustic positioning system
USBL (ultra-short baseline, also known as SSBL for super short base line) is a
Mechanism
An acoustic pulse is transmitted by the transceiver and detected by the subsea transponder, which replies with its own acoustic pulse. This return pulse is detected by the shipboard transceiver. The time from the transmission of the initial acoustic pulse until the reply is detected is measured by the USBL system and is converted into a range.
To calculate a subsea position, the USBL calculates both a range and an angle from the transceiver to the
The presence of environmental noise reduces USBL positioning accuracy. Combining Kalman filtering with an element array has been used to filter the signals and improve accuracy, using the minimum mean-square error rule.[1]
Applications
USBLs are used in "inverted" (iUSBL) configurations, with the transceiver mounted on an autonomous underwater vehicle, and the transponder on the ship/shore that launches it. In this case, the "topside" processing happens inside the vehicle to allow it to locate the transponder for applications such as automatic docking, target tracking, and the exchange of text messages.[2]
References
- PMID 33379311.
- ^ Sanchez, Nouran Salahieh,Eric Levenson,Priscilla Alvarez,Ray (2023-06-20). "Banging sounds heard during Titan search, according to internal US government memo". CNN. Retrieved 2023-06-25.
{{cite web}}: CS1 maint: multiple names: authors list (link)
External links
- "Product Survey USBL Systems" (PDF). Hydro International, May 2008. Archived from the original on 2010-08-21.
{{cite web}}: CS1 maint: unfit URL (link) - Coxworth, Ben (2022-04-07). "Hydrus packs autonomous ocean exploration tech into a much smaller package". New Atlas. Retrieved 2022-04-08.
- Jaffre, F.M.; Austin, T.C.; Allen, B.G.; Stokey, R.; von Alt, C.J. (2005). Ultra short baseline acoustic receiver/processor. pp. 1382–1385 Vol. 2. S2CID 31059154.