Octans Nano

Description

The Octans Nano is a compact subsea attitude and heading reference system (AHRS) built on Exail's fibre-optic gyroscope (FOG) technology. It computes true heading, roll, pitch and rates of turn in real time, in a six-litre titanium housing rated to 6,000 m.

Heading accuracy is 0.5° secant latitude RMS with GNSS and/or speed aiding, and roll and pitch accuracy is 0.1° RMS without aiding. It accepts input from GNSS, USBL, LBL, DVL, EM log, depth, CTD and SVP sensors and can rebroadcast sensor inputs. Typical applications are ROV navigation, towfish, plough and trencher navigation, and attitude monitoring of subsea structures.

The unit has five RS422/RS232 serial ports, 10/100 Mbit Ethernet and PPS input and output, with data output at 0.1–200 Hz. It runs on 24 VDC (20–32 V), draws less than 20 W, weighs 11.33 kg in air and 6.6 kg in water, and measures Ø178 × 266 mm. It contains no ITAR components.

Technical Specification

Technology

Strapdown FOG, AHRS

Heading accuracy (RMS)

0.5° secant latitude with GNSS and/or speed

Roll/pitch accuracy (RMS)

0.1° (no aiding)

Heading / roll / pitch range

0–360° / ±180° / ±90°

Rotation rate range

Up to 250°/s

Acceleration range

±5 g

Operating / storage temperature

−20–55 °C / −40–80 °C

MTBF

100,000 hours (system observed); 500,000 hours (FOG and accelerometers)

Depth rating

6,000 m

Material

Titanium

Weight in air / water

11.33 kg / 6.6 kg

Dimensions (Ø × H)

Ø178 × 266 mm

Mounting

8 × Ø6.5 mm holes

Connector

1 × 26-pin SEACON

Aiding sensors

GNSS, USBL, LBL, DVL, EM log, depth, CTD, SVP

Serial

5 ports, RS422 or RS232

Ethernet

10/100 Mbit, UDP/TCP (client/server), web server GUI

Pulse

1 PPS input, 1 PPS output, 1 DVL sync pulse

Input/output

Configurable 7 inputs / 5 outputs; NMEA, ASCII, Exail STD BIN; more than 130 output protocols

Baud rates

Up to 576 kbaud

Data output rate

0.1–200 Hz

Power

24 VDC (20–32 V), < 20 W

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