Trackdyne Documentation
Main ❯ Navigation & tracking systems ❯ AsterGrid Buoy: Device specification
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AsterGrid Buoy - GNSS-equipped sonobuoy Device specification |
KEY FEATURES
- High-performance combined GPS/GLONASS receiver
- Rugged, durable, easily noticeable, maintenance-free housing
- Simultaneous positioning for an unlimited number of AsterGrid Node/AsterGrid Nav devices
- Long battery life of up to 48 hours
- Automatic activation in water
- Reliable and noise-resistant digital broadband underwater acoustic communication technology
DESCRIPTION
The AsterGrid Buoy GNSS-equipped sonobuoy, in a set of four such devices, forms a floating long navigation base, which supports the simultaneous positioning of an unlimited number of AsterGrid Node/AsterGrid Nav navigation receivers.
The device consists of two blocks potted in a polyurethane compound: an underwater block, which houses the LiFePO4 battery, and a surface block, which houses the underwater acoustic transmitter and the GNSS receiver. The blocks are connected to each other by a plastic tube on which additional buoyancy blocks are mounted. The device is equipped with a light indication system for the status and the sequence number of the buoy in the set: the light sources are located in the upper part of the surface block, which is made of transparent polymer with the addition of a phosphor. AsterGrid Buoy buoys switch on automatically when immersed in water and switch off automatically when taken out of the water. For attachment to an anchor line, load-bearing eyes are provided in the lower part of the battery block.
TECHNICAL SPECIFICATIONS
| PARAMETER | VALUE |
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| DIMENSIONS (Ø x h) | 125 x 790 mm |
| WEIGHT (dry) | 3.8 kg |
| EXCESS BUOYANCY | 1 kg |
| CARRIER FREQUENCY | 20100 Hz |
| MAXIMUM BATTERY LIFE | 48 hours |
| MAXIMUM ACOUSTIC COMMUNICATION RANGE1 | 3000 m |
| MAXIMUM ACOUSTIC SOURCE LEVEL | 170 dB re 1 μPa @ 1 m |
| MAXIMUM PERMISSIBLE DISTANCE TO OTHER BUOYS OF THE SET2,3 | 700 m |
| MINIMUM PERMISSIBLE DISTANCE TO OTHER BUOYS OF THE SET3 | 30 m |
| MAXIMUM VELOCITY RELATIVE TO RECEIVERS | +/- 1.8 m/s |
| OPERATING TEMPERATURE RANGE | -10 .. 50 °C |
| REFERENCE ELLIPSOID | WGS-84 |
| BUILT-IN BATTERY TYPE | LiFePO4 |
| BUILT-IN BATTERY CAPACITY | 76 W·h |
| UNDERWATER ACOUSTIC TRANSMITTER CABLE LENGTH | 1 m |
| FULL CHARGE TIME FROM 220 V / 50 Hz MAINS | 5 h |
ADDITIONAL INFORMATION
| MSDS OF THE BUILT-IN POWER SUPPLY | ELECTRONIC VERSION OF THIS DOCUMENT |
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1 A parameter that determines the maximum range at which signal reception is possible, based on the electro-acoustic parameters of the transmitter and receiver, the spatial decrease in the intensity of sound energy, attenuation in the medium and the acoustic noise level.
2 The buoys are placed on the water surface in a convex polygon so that the distance from each buoy to any other does not exceed the specified value.
3 The immersion depth of the navigation receivers must not exceed the dimensions of the navigation base.