The MRU-PD is a basic motion reference unit that combines three-axis solid state accelerometers, gyroscopes and barometric sensors and delivers heave, surge, sway, pitch, roll, heading, position and velocity outputs for marine and maritime applications. It also incorporates a high-accuracy RTK-capable dual-antenna GNSS receiver.
With low noise and high accuracy, the sensor provides reliable real-time measurement under challenging surface or subsea conditions, and is ideal for a variety of use cases including bathymetric and hydrographic survey, platform stabilization, and unmanned underwater vehicles.
The unit incorporates a range of algorithms for specific platforms including surface vessels, ROVs and AUVs, buoys, cranes, helidecks and more. Data can be output in standard industry formats including Kongsberg/Seatex, Teledyne and SMC. The MRU-PD is available in an IP67-rated housing or a special rugged subsea enclosure rated to depths of 1000 metres.
Specifications:
| Dimensions |
120 x 50 x 53 mm 245 x 140 x 115 mm (subsea) |
| Weight |
320 g .5 kg (subsea) |
| Power | 5W (6W w/ datalogger) |
| Heave/Surge/Sway Accuracy |
5% / 0.05 m RMS real time 2% / 0.02 m RMS post processed |
| Heave/Surge/Sway Resolution | 0.01 m |
| Heave/Surge/Sway Measurement Range | ±300 m |
| Pitch & Roll Accuracy |
0.02 deg RMS dynamic 0.01 deg static 0.006 deg RMS post processed |
| Pitch & Roll Resolution | 0.005 deg |
| Pitch & Roll Measurement Range | ±90, ±180 deg |
| Heading Accuracy |
0.08 deg static & dynamic (2m baseline) 0.05 deg static & dynamic (4m baseline) <0.03 deg RMS post-processed |
| Heading Resolution | 0.001 deg |
| Heading Measurement Range | 0 – 360 deg |
| Horizontal Position Accuracy |
0.6 m (SBAS) 0.4 m (DGPS) 0.01 m + 1 ppm (RTK) |
| Velocity Accuracy | <0.03 m/s RMS |
