LBL and sparse-LBL intelligent transponder

Vue d'ensemble

The Canopus transponder is the latest addition to iXblue's underwater positioning systems. Used as a reference seabed transponder or installed on tracked vehicles, it contributes to the best underwater positioning solution in terms of accuracy, functionalities and ease-of-use.

Canopus is an intelligent seabed transponder providing the most advanced LBL capabilities to iXblue positioning and navigation solutions.

Used either in sparse array mode, with Ramses transceiver and iXblue INS, or in full LBL mode depending on the requirements of the operation area, Canopus provides the highest positioning accuracy with the added advantage of reducing the number of transponders required.

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Main performances
million pings
at maximum sound levels
Up to
years of
listening autonomy
with Alkaline batteries
Up to
water depth


  • Low power consumption
  • Operation life > 1,600,000 pings at maximum sound level (Alkaline)
  • A few hundreds unique wideband address codes
  • Compatible with Gaps and Posidonia (USBL), Ramses (LBL and ASBL), iXblue INS and third-party acoustic systems
  • Depth rating: up to 4,000 m



  • Modes of operation: Long BaseLine positioning, ASBL Sparse Array positioning, Acoustic Data telemetry and Modem
  • Embedded user interface (MMI) through WiFi wireless communication link
  • Standard environment sensors including: pressure, temperature, inclinometer
  • Up to 4 years autonomy with standard Alkaline battery pack



iXblue new global subsea positioning system chosen by leading european institute for geodetic mission off the coast of Sicily

iXblue has been chosen by the European Institute for Marine Studies (IUEM) to provide 8 Canopus LBL transponders for a major geodetic mission off the coast of Sicily. Deployed on the seabed, 2,500 meters below the surface, the Canopus transponders will measure the crustal deformation along the North-South Alfeo faults with a millimeter-scale resolution over the course of 4 years.

Ifremer's AUV IdefX with Ramses

Sparse-LBL: a cost efficient and flexible solution for enhanced subsea autonomy

Nowadays, various positioning techniques are available for companies and institutes that need valuable navigation information to operate undersea. And while LBL usually remains the preferred solution for the highly accurate positioning of ROVs and AUVs, this method remains costly as it requires the use of many transponders to produce a single position. Operators are thus now looking for new ways that are more efficient, flexible and less costly to conduct their operations.