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Main ❯ Underwater acoustic modems ❯ Device specification: uWave
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uWave underwater acoustic modem Device specifications |
KEY FEATURES
- Extremely small size and weight
- Can be used in underwater wireless sensors networks
- Communication range is up to 10001,* m
- Reliable data transmission on speed up to 6342 bit/s
- Code subscribers division
- Signal propagation time measurement feature
- State of the art digital broadband underwater acoustic communication technology
- Low power consumption (Rx/Tx) 0.33/6 W
- Easy and open interfacing protocol
- Built-in pressure/temperature sensor
- Packet mode with guaranteed delivery (ALO - At-least-once)
- Patented** monoblock design
DESCRIPTION
uWave is the world’s smallest*** underwater acoustic modem. The device allows to provide hydroacoustic digital communication between 254 subscribers in water areas of 1000 x 1000 meters using code mode, transparent channel mode or packet mode with logical addressing and guaranteed delivery. Extremely small size, low power consumption and ease of use make the uWave family modems the ideal solution for autonomous underwater device control and data transmission in size and weight sensitive applications.
The device allows:
- transmit data in transparent channel mode - just connect the modem to the serial port
- request depth, temperature, supply voltage of remote modems of the uWave family with simultaneous measurement of the signal propagation time (and hence the distance to them)
- transfer data in packet mode with guaranteed delivery (ALO - At-least-once) and delivery notification
- measure local immersion depth, water temperature and supply voltage.
uWave family devices use a simple NMEA-like protocol settings, and the supplied open-source libraries uWaveLib (.NET) and uWave ALibs (Arduino) allow you to make the integration of modems into custom solutions as simple and fast as possible.
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* According to tests in a real water body, with the help of uWave devices, a practical communication range of 1092 m was achieved.
** Patents RU2659299C1, US11257472B2.
*** According to open sources, June 2023.
TECHNICAL SPECIFICATIONS
| PARAMETER | VALUE |
|---|---|
| ГАБАРИТЫ (Ф х h) | 41 x 45 mm |
| WEIGHT (dry) | 0.16 kg |
| DEPTH RATING | 300 m |
| MAX. ACOUSTIC COMMUNICATION RANGE1 | 1000 m |
| PAYLOAD DATA RATE2 | 78/156/314/634 bps |
| POWER CONSUMPTION Rx/Tx | 0.33/6 W |
| SUPPLY VOLTAGE3,4 | 5 .. 12 V |
| DATA LINES VOLTAGE | 0 .. 3.3 V |
| DATA LINES OUTPUT IMPEDANCE | 1 kOhm |
| BANDWIDTH | 10 .. 30 kHz |
| MAX. ACOUSTIC SOURCE LEVEL (in band) | 169 dB re 1 uPa @ 1 m |
| BIT ERROR RATE | 10-6 |
| SNR5 | -2 дБ |
| MAX RELATIVE VELOCITY | +/- 1 m/s |
| RATED STARTUP TIME | 100 msec |
| WORKING TEMPERATURE RANGE | -5 .. 50 °C |
| INTERFACE6 | UART 9600 bps |
| COMMUNICATION PROTOCOL | NMEA 0183 PUWV |
| CABLE LENGTH6 | 0.5 m |
| CABLE DIAMETER | 5 mm |
| SUBSCRIBERS DIVISION2 | up to 20 code channels |
| TRANSMITTER BUFFER SIZE | 128 bytes |
| COMMAND MODE | 16 preset messages (9 for user commands) |
| SIGNAL PROPAGATION TIME MEASUREMENT RESOLUTION7 | 0.0001 sec |
| PACKET MODE | 254 addresses, broadcast messages, packet size is up to 64 bytes |
| DEPTH SENSOR RESOLUTION (local)8 | 0.01 m |
| DEPTH SENSOR RESOLUTION (remote)8 | 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, spatial decrease in the intensity of sound energy, attenuation in the medium and acoustic noise level. In 78 bps speed mode.
2 78 bps speed mode used as a default. This mode provide the maximum noise and multipath immunity, reliability and number of code channels. Different speed modes are not compatible, and can be set by reflashing the modem’s firmware.
3 The maximum output power can be achieved with 12 V supply voltage only.
4 The device has a built-in overvoltage protection of the amplifying circuit. At voltages above 12.8-13 volts, the device does not turn on the power amplifier, i.e. it does not allow data transfer.
5 The value was obtained without taking into account the effect of multipath propagation in a laboratory stationary experiment.
6 Can be changed by a special request.
7 Given this value, the resolution when measuring distance, taking into account the sound speed of 1500 m/s, is 0.15 m.
8 A modem equipped with a depth transducer can transmit depth readings locally - via cable, to the control system, and remote - upon request from another modem.