Directional Waverider DWR-G4
Datawell’s smallest directional wave measuring buoy
With a 0.4 m diameter mini-buoy version Datawell completes its range of GPS buoys: DWR-G9, DWR-G7 and DWR-G4, with 0.9 m, 0.7 m and 0.4 m diameters, respectively.
Just like its larger equivalents the DWR-G4 relies on the Datawell principle of measuring waves with a single Global Positioning System receiver (GPS). By now this technique is well-established in oceanography as evidenced by several publications and well-pleased users in the field.
- Sensor
wave motion sensor based on GPS
- Measures
– wave height for wave periods of 1.6 to 100 seconds
1 cm precision in all directions (free floating)
– wave direction
– water temperature
- Additional features
– GPS for buoy monitoring and tracking through HF link
– internal data logger
– LED flasher
– 0.4 m diameter spherical hull of AISI 316
– 3 months battery life
Specifications
Options
Downloads
Wave motion sensor
Sensor | single GPS (not differential) | ||||||
Periods |
|
||||||
Precision | 0.01 to 0.02 m, all directions (1σ) (excluding GPS antenna pitch and roll motion) |
||||||
Calibration | not required ever | ||||||
Exclusion | GPS signals do not penetrate through water, occasional data gaps may occur | ||||||
Exclusion | measurements fail at position changes greater than 100 m in less than 100 s, e.g. when used free floating or towed at constant velocities greater than 1 m/s. |
Wave data
Data | north, west, vertical |
Resolution | 0.01 m (north 0.02 m, LSB of north is GPS data gap indicator) |
Range | -20 m to +20 m |
Rate | 1.28 Hz |
Reference | WGS84 |
Spectral data
Frequency resolution | 0.005 Hz below 0.10 Hz and 0.01 Hz above |
Frequency range | 0.025 Hz to 0.60 Hz |
Direction resolution | 1.5° |
Direction range | 0° to 360° |
Standard features
Integrated data logger | Compact flash module 2 Gb |
LED flashlight | Antenna with integrated LED flasher, colour yellow (590 nm), standard length 35 cm, “Standard pattern”: 5 flashes every 20 s, “Increased pattern”: 5 flashes every 15 s. |
GPS position | every 30 minutes, precision < 5 m |
General
Material | Stainless steel AISI 316 |
Hull diameter | 0.4 m (excluding fender) 0.46 m (including fender) |
Weight | 17 kg |
Batteries | operational life 30 days, 1 section of 4 batteries Type: Datacell RC27G (270 Wh green) |
Hull painting | Brantho-Korrux “3 in 1” paint system (no anti-fouling) |
Optional features
HF link Flashlight antenna (1.95 m) |
frequency range 25.5 MHz to 35.5 MHz (35.5 to 45.0 MHz on request) transmission range 50 km, for use with Datawell RX-C receiver. |
Argos/Iridium SBD | satellite communication |
GSM | mobile communication |
HF antenna (25 km range)
Argos module
GSM-SMS module
GSM internet module
Hull painting
FAQ
Toggle #1
Tab Item Content