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Main ❯ Underwater acoustic modems ❯ uWave USBL Modem: Device specification
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uWave USBL Modem - underwater acoustic modem Device specification |
KEY FEATURES
- Extremely small size and weight
- Data transmission combined with USBL navigation
- Communication range up to 30001,8 m
- Reliable data transmission at speeds up to 3142 bit/s
- Code division multiple access
- Signal propagation time measurement
- Highly reliable digital underwater acoustic communication
- Low power consumption (Rx/Tx) 0.33/10 W
- Open interfacing protocol
- Built-in pressure/temperature sensor
- Packet mode with guaranteed delivery (ALO - At-least-once)
- Patented* monoblock design
DESCRIPTION
uWave USBL Modem is a device that combines the functions of data transmission over an underwater acoustic channel and a navigation system on an ultra-short baseline.
Using uWave USBL Modem modems, the user can:
- transmit arbitrary user data between uWave USBL Modem, uWave Max and uWave modems in any combination, with simultaneous determination of the horizontal angle of arrival of the signal;
- determine the location of uWave USBL Modem, uWave Max and uWave modems in command mode by the distance and the horizontal angle of arrival of the signal;
- transmit up to 9 short coded user remote control commands;
- request the depth, temperature and supply voltage from remote uWave USBL Modem, uWave Max and uWave modems;
- measure its own depth, temperature, roll and pitch angles;
uWave family devices use a simple NMEA-like protocol for configuration, and the supplied open-source libraries uWaveLib (.NET) and uWave ALibs (Arduino) make the integration of the modems into custom solutions as simple and fast as possible.
* Patent RU2659299C1.
TECHNICAL SPECIFICATIONS
| PARAMETER | VALUE |
|---|---|
| DIMENSIONS (Ø x h) | 64 x 128 mm |
| WEIGHT (dry) | 0.44 kg |
| MAXIMUM DEPTH | 300 m |
| MAXIMUM ACOUSTIC COMMUNICATION RANGE1,8 | 3000 m |
| DATA RATE2 | 78/156/314 bit/s |
| POWER CONSUMPTION Rx/Tx | 0.33/10 W |
| SUPPLY VOLTAGE3,4 | 5 .. 12 V |
| DATA LINE VOLTAGE | 0 .. 3.3 V |
| DATA LINE OUTPUT IMPEDANCE | 1 kΩ |
| NOMINAL HORIZONTAL ANGLE OF ARRIVAL ACCURACY5 | 2° |
| MAXIMUM DEVICE TILT RELATIVE TO THE VERTICAL COMPENSATED BY THE BUILT-IN INCLINOMETER (ROLL/PITCH) | +/- 30° |
| OPERATING CONE (RELATIVE TO THE HORIZONTAL) | 85° |
| CARRIER | 20050 Hz |
| MAXIMUM ACOUSTIC SOURCE LEVEL (in band) | 175 dB re 1 μPa @ 1 m |
| BIT ERROR RATE | 10-6 |
| SNR5 | -2 dB |
| MAXIMUM RELATIVE VELOCITY | +/- 1 m/s |
| STARTUP TIME | 100 ms |
| OPERATING TEMPERATURE RANGE | -5 .. 50 °C |
| INTERFACE6 | UART 9600 bit/s |
| COMMUNICATION PROTOCOL | NMEA 0183 PUWV |
| CABLE LENGTH6 | 0.5 m |
| MULTIPLE ACCESS SCHEME2 | 20 code channels |
| TRANSMITTER BUFFER SIZE | 127 bytes |
| COMMAND MODE | 16 preset messages (9 for user applications) |
| SIGNAL PROPAGATION TIME MEASUREMENT RESOLUTION7 | 0.0001 s |
| PACKET MODE | 254 addresses with delivery notification, broadcast messages, packet size up to 64 bytes |
| DEPTH SENSOR RESOLUTION (local)9 | 0.01 m |
| DEPTH SENSOR RESOLUTION (remote)9 | 0.1 m |
1 A parameter that determines the maximum range at which a signal can be received, 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 level of underwater acoustic noise.
2 By default, the devices operate in the 78 bit/s data rate mode, which provides the maximum range, communication reliability and the maximum number of code channels. Different data rate modes are not compatible with each other. Switching the modem to another data rate mode is done by replacing its firmware.
3 The maximum output power is achieved when the modem is supplied with 12 V.
4 The device has built-in overvoltage protection of the amplifier circuit. At voltages above 12.8-13 volts, the device does not turn on the power amplifier, i.e. it does not allow data transmission.
5 The value was obtained in a laboratory static experiment, without taking into account the multipath propagation effect.
6 The value can be changed on request.
7 Given this value, the resolution when measuring distance, taking into account the speed of sound of 1500 m/s, is 0.15 m.
8 When working with another uWave USBL, uWave Max or uWave Max OEM. The maximum communication range with standard uWave modems is 1000 meters.
9 A modem equipped with a depth sensor can transmit depth readings locally - via the cable, to the control system, and remotely - upon request from another modem.