Page 24: of Marine Technology Magazine (January 2021)

AUTONOMOUS NAVIGATION

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Fig. 3

Sonardyne picture of the water column in terms of position and with ves- communications and control capability for underwater pay- sel motion compensated for. This negates the need to integrate load robotics from the Armada vessels. In addition, the ves- separate ADCP and motion sensor data and dramatically re- sels will be ? tted with SPRINT-Nav, to provide continuous, duces the reliance of continuous and accurate GNSS data dur- uninterrupted navigational aiding to underpin safe remote op- ing dynamic water column data collection operations. In addi- erations, even if GNSS service is impaired. The underwater tion, if you are in deep water and don’t have bottom lock, but vehicles deployed by these USVs will also have SPRINT-Nav you do have GNSS, the SPRINT inertial measurements can systems and our Wideband Sub Mini 6+ tracking transponders compensate for vessel motion in the ADCP data. that work using the same common hardware as Ranger 2.

The combination of highly accurate navigation and the abili- ty measure water current optimally without GNSS signi? cant- CAPABILITY AT HIGHER ALTITUDES ly reduces the risk of performing ROV and AUV deployments A further development we’ve initiated over the last year has from USV host platforms. been to create a higher altitude version of our Syrinx DVL. At

A good example of this is the Armada ? eet, being built by launch SPRINT-Nav was only available with a 600 kHz Syr-

Ocean In? nity. The ? rst wave of the ? eet will host our Ranger inx DVL. Now a 400kHz option is available which can achieve 2 Ultra-Short BaseLine (USBL) positioning system and Ma- reliable bottom lock down to 220 m water depth (it’s 175 m in rine Robotics pack, which will enable all-in-one tracking, the standard SPRINT-Nav) and ADCP functionality to 120 m. 24 January/February 2021

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