iWBMSe LR
Norbit iWBMSe LR
iWBMSe LR
Long-range surveys with SurfMaster
iWBMSe LR combines SurfMaster GNSS/INS and broadband sonar in a long-range configuration. Its nominal 200 kHz frequency provides a different range and beam-width balance from 400 kHz models. Survey lines in harbour approaches, lakes and coastal areas are planned around the required seabed coverage. Heading and attitude figures differ from iWBMS LR and should be included in the project accuracy budget.
Survey workflow and quality control
Before mobilisation, the coordinate system, vertical reference, antenna offsets and sonar mounting geometry are defined. Sound-speed profiles, time synchronisation and angular alignment are checked during trial lines. Sonar observations are assessed alongside position and motion data, with overlapping lines and cross lines used to check consistency.
Deliverables can include a bathymetric surface, sections, a seabed model for volume calculations or structure inspection data, depending on the application. Acoustic resolution alone does not represent final georeferenced survey accuracy. Water depth, seabed material, vessel motion and selected software options are considered together when specifying the system.
Technical specifications
| GNSS/INS | Applanix SurfMaster |
|---|---|
| Frequency | 200 kHz nominal; 160–400 kHz |
| Acoustic depth range | 0.2–600 m |
| Beam width | 1.8° × 1.8° @ 200 kHz; 0.9° × 0.9° @ 400 kHz |
| Beams / sector | 256–512; 5–210° |
| Range resolution | <20 mm @ 200 kHz; <10 mm @ 400 kHz |
| Ping rate | Up to 60 Hz |
| Roll / pitch accuracy | 0.03° |
| Heading accuracy | 0.08° RTK; 2 m antenna separation |
| Power / housing depth rating | 60 W (75 W maximum); 100 m |
Specifications follow the original manufacturer brochure PS-160003-5. Acoustic range is distinct from housing depth rating. Options and operating conditions affect achievable performance.
The technical reference for this model is the existing original brochure revision. Current hardware options and availability should be confirmed for the project.