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Products > Lodestar (Surface) AHRS and Acoustically Aided INS
- Overview
- Features & Benefits
- Technical Specifications
- PDF Datasheet
- Related Products
- - Lodestar Subsea AHRS and AAINS
- - Lodestar GyroUSBL
- - Lodestar GyroCompatt
- - Radian AHRS
- Overview
- Lodestar is a solid state IMO approved Attitude and Heading Reference System (AHRS) and Acoustically Aided Inertial Navigation System (AAINS).
The unit comprises three high grade/high reliability, commercially available Ring Laser Gyros (RLGs) and three linear accelerometers. A Sonardyne developed gyrocompass algorithm runs in the background even when used as an AAINS.
A flexible AC or DC power input has been incorporated to facilitate surface vessel applications. With the battery back up capability supplied, the unit is able to continue running the AHRS and AAINS algorithm during vessel power brown-outs.
The Lodestar AHRS algorithm outputs precise heading, roll, pitch and heave estimation in dynamic conditions without the need for external aiding inputs or vessel manoeuvres.
Lodestar is the core component in any Sonardyne AAINS system. It powers and directly interfaces to aiding sensors such as USBL or LBL transceiver, a DVL, a GNSS receiver, a pressure sensor and a sound speed sensor (SSS).
- Applications Include:
- - An optimised USBL system: The directly coupled precise attitude data complements the precision of advanced USBL systems
- As a precise position input to DP systems using AAINS, a USBL system and one or more seabed reference beacons for operations in excess of 2000 metres
- As a positioning system for an ROV, aided by a combination of position estimates from a topside USBL system, vehicle mounted DVL, pressure, sound speed and LBL transceiver (subsea option)
- Multi-beam Surveys
- Features & Benefits
- Single IP66 rated solution for motion sensor and gyrocompass
- 0.1 heading accuracy unaided
- AAINS capability
- <5 minute settling time
- 0.01 roll & pitch accuracy
- 5cm / 5% heave accuracy
- Fast follow up speed of 500/Sec
- Subsea versions rated to 1000, 3000, 5000 available
- Ethernet interface
- Transport approved Li-Ion battery back up as standard
- Flexible power input AC or DC
- On board 8GB memory (Expandable to 32GB)
- No dedicated GPS string required
- MTBF RLG >300,000 hours MTBF Lodestar >50,000 hours
- Designed and Approved to IMO Resolution A424(XI)
Technical Specifications
| Feature | Type 8084-000-000 | ||
|---|---|---|---|
| Attitude | Heading | Range | 0-360° |
| Accuracy | 0.10° secant latitude rms | ||
| Settle Time | <5 minutes | ||
| Follow Up Speed | 500º / Second | ||
| Resolution | 0.01º | ||
| Roll & Pitch | Range | ±180º (no physical limit) | |
| Accuracy | 0.01º | ||
| Resolution | 0.01º | ||
| Heave | Range | ±99m | |
| Accuracy (Real Time) | 5cm or 5% whichever the greater | ||
| Bandwidth | User Selectable | ||
| Resolution | 0.01m | ||
| Physical | Size | 276mm x 297mm x 214 mm (hxwxd) | |
| Weight | 13kg | ||
| Mechanical Construction | Aluminium (Powder Coated) | ||
| Environmental | Operating Temperature | -10°C to +55°C | |
| Shock Rating Operational | 22g, 11ms half sine | ||
| IP Rating | IP66 | ||
| Power Requirement | 90–260V AC or 20 –50V DC, 10W nominal, 20W max | ||
| Back Up Battery Type / Life | Li-Ion / 3 hours | ||
| Data Storage | 8GB on board memory (Expandable to 32GB) | ||
| Digital Output | Number of Digital Ports / Protocol | 5 Digital Ports / RS232 or RS485 | |
| Other Ports | 1 x Ethernet | ||
| Power Outputs | Number of Power Ports | 2 x 48V DC 20W Output | |
| AAINS | Navigation Error (Scenario/ Aiding Dependent) | ||
| Navigation Error (Free Inertial) | Typically 10 metres, 4 minutes after loss of aiding | ||
| Maximum Acceleration | 2.5g or 5.0g | ||