INS inertial system Boreas A90

IMUAHRSgyroscopic

Product Overview
The Boreas A70 and A90 Series is a rugged inertial navigation system with a north-seeking gyrocompass that maintains reliable navigation in GNSS/GPS-denied and harsh environments, packaged in a compact low-SWaP-C (Size, Weight, Power and Cost). The A70 & A90 variants provide heading and orientation as an AHRS and INS, with full INS positioning capability when supplied with an external position source (e.g. an external GNSS receiver).

Key Performance
Boreas A70
Roll & Pitch: 0.01°
Heading Accuracy: 0.1° seclat
Bias Instability: 0.01 °/hr
Output Rate: 1000 Hz

Boreas A90
Roll & Pitch: 0.005°
Heading: 0.01° seclat
Bias Instability: 0.001 °/hr
Output Rate: 1000 Hz

Features

• Gyrocompass North-Seeking

The Boreas A Series determines heading without GNSS or magnetometer by sensing the Earth’s rotation. Its north-seeking capability acquires accurate heading in static and dynamic conditions, including at high latitudes.

• Reliability & Environmental Capability

The Boreas A70 & A90 are designed for rugged reliability, with hardware and software tested to environmental and electromagnetic standards including MIL-STD-461 and MIL-STD-810H. The precision aluminium enclosure is rated to IP67 (waterproof and dustproof). The system is resilient to shock and vibration for extreme operating conditions.

• Industry-leading SWaP-C

The Boreas FOG Series delivers industry-leading performance with a lightweight design, excelling in terms of Size, Weight, Power, and Cost (SWaP-C).

• Multi-protocol & Interfaces

The Boreas supports multiple physical interfaces (Ethernet, CAN, RS232, RS422, 1PPS, GPIO) and industry-standard protocols (NMEA 0183, CANopen, AN Packet Protocol, 1PPS) along with a range of proprietary protocols. A responsive embedded web interface provides access to device functions and internal storage enables up to one year of data logging.

Applications
Marine Surveying
Land Surveying
Antenna Targeting
ROV/AUV Navigation

Specifications — Navigation
Roll & Pitch Accuracy (A90): 0.005 °
Roll & Pitch Accuracy (A70): 0.01 °
Heading Accuracy (A90): 0.01 ° secant latitude RMS
Heading Accuracy (A70): 0.1 ° secant latitude RMS
Gyrocompassing Alignment : 2 minutes coarse
Gyrocompassing Alignment: 10 minutes fine (typical)
Horizontal Position Accuracy (external RTK GNSS aided): 0.01 m
Vertical Position Accuracy (external RTK GNSS aided): 0.015 m
Velocity Accuracy (external GNSS aided): 0.005 m/s
Heave Accuracy: 2 % or 0.02 m (whichever is greater)
Output Rate: 1000 Hz

Specifications — Sensors
Accelerometers
Range: ±15 g
Bias Instability: 7 ug
Initial Bias: < 100 ug
Scale Factor Stability (A90): 100 ppm
Scale Factor Stability (A70): 150 ppm
Non‑linearity: 150 ppm
Cross‑axis Alignment Error: < 0.001 °
Noise Density (A90): 30 ug/√Hz
Noise Density (A70): 40 ug/√Hz
Random Walk (A90): 17 mm/s/√hr VRW
Random Walk (A70): 23 mm/s/√hr VRW
Bandwidth: 300 Hz

Gyroscopes
Range: ±490 °/s
Bias Instability (A90): 0.001 °/hr
Bias Instability (A70): 0.01 °/hr
Initial Bias (A90): < 0.01 °/hr
Initial Bias (A70): < 0.05 °/hr
Initial Scaling Error (A90): 80 ppm
Initial Scaling Error (A70): 100 ppm
Scale Factor Stability (A90): 10 ppm
Scale Factor Stability (A70): 20 ppm
Non‑linearity: 10 ppm
Cross‑axis Alignment Error: < 0.001 °
Noise Density (A90): 0.06 °/hr/√Hz
Noise Density (A70): 0.3 °/hr/√Hz
Random Walk (A90): 0.001 °/√hr ARW
Random Walk (A70): 0.005 °/√hr ARW
Bandwidth: 400 Hz

Pressure
Range: 10 to 130 kPa
Bias Instability: 8 Pa
Initial Bias: < 50 Pa
Noise Density: 0.4 Pa/√Hz
Bandwidth: 50 Hz

Specifications — Communication
Interface: Ethernet, RS232/RS422, CAN, 1PPS
Speed: 100 Mbit (Ethernet), 4800 to 4M baud (serial)
Protocol: AN Packet Protocol, NMEA, CANopen
Peripheral Interface: 2× GPIO and 1× auxiliary RS232
GPIO Level: 5 V (RS232), 3.3 V
GPIO Functions: 1PPS input/output, odometer input, DVL/USBL input, air data input, zero velocity input, NMEA input/output, NovAtel GNSS input, Trimble GNSS input, AN Packet Protocol, CAN/CANopen

Specifications — Hardware
Operating Voltage: 9 to 36 V
Input Protection: -200 to 200V
Power Consumption (Typical): 12 W
Hot Start Standby Duration: 48 hrs
Operating Temperature: −40 °C to 75 °C
Environmental Protection: IP67 / MIL‑STD‑810H
MTBF: > 70,000 hrs
Shock Limit: 50 g, 11 ms
Vibration Limit: 8 g RMS (20–2000 Hz random)
Dimensions: 160 × 140 × 115.5 mm
Weight: 2.7 kg