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Zima 2 USBL
Data brief

Brief description

Zima 2 USBL is a hydroacoustic ultra-short baseline (USBL) navigation system designed to determine the location of underwater objects marked with hydroacoustic responder beacons Zima2-R using a direction-finding transceiver antenna Zima2-B.

System Composition

   
Zima2-B Zima2-B
Direction-finding antenna
Zima2-R Zima2-R
Responder-beacons (one base station can work with a maximum of 16 transponders in sequence)
Bat&Link Box Bat&Link Box
Autonomous power supply

Tasks to be solved by the system

Distinctive features

Zima2-B placement
Схема установки антенны Zima 2-B
The antenna is mounted on a rigid rod so that it is no closer than 2 meters from the surface of the water and no closer than 1.5 meters from the bottom of the vessel. The antenna offsets relative to the geolocation point and the angular offset of the zero of the antenna and the GNSS compass are set

Pairing schemes

Work in relative coordinates

To determine the relative location of the responder beacons, the antenna is interfaced with a PC on which specialized open source software AzimuthSuite is installed. The antenna is connected to the PC via Bat&Link Box, which converts the interface to USB and powers the antenna.

In this case, the following data and functions are available to the user:

Zima2B relative scheme
Working in relative coordinates

Working in absolute coordinates

To determine the absolute location of the responder beacons, the antenna is interfaced with a PC on which specialized control software AzimuthSuite is installed. The antenna is connected to the PC via Bat&Link Box, which converts the interface to USB and powers the antenna. Additionally, an external GNSS system with compass function operating under the NMEA 0183 protocol (RMC and HDT messages) is connected.

Zima-B absolut scheme
Working in absolute coordinates

In this case, the following data and functions are available to the user:

Geometric Constraints

Since the location of Zima2-R responder beacons is carried out by the horizontal angle of arrival of the signal, slant range and depth difference, the Zima 2-B direction finding station antenna array has the highest sensitivity in the range angles from 0° to 85° from the horizontal. The accuracy of the system when the responder is close to the nadir direction may be reduced.

Zima2-B angular zones
Geometric constraints Zima 2-B
1 - DF antenna, 2 - upper hemisphere, 3 - working area (0° .. 85°, 0 .. -85°), 4 - area of accuracy reduction (85° .. -85°)

Additional information
Zima2 USBL: User’s manual
Zima2-R: Responder beacon, device specification
Zima2-B: DF-antenna, device specification
Bat&Link Box: Autonomous power supply, device specification
Zima2 USBL: Communication protocol specification