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Overview

AquaComm: Underwater wireless modem

AquaNetwork: Underwater wireless modem with networking capability

AquaCase: Underwater housing

AquaBase: Deck unit

AquaTrans: Acoustic dunking hydrophone transducer

AquaStore: Low-power versatile data logger

Products under development

AquaNetwork: Underwater wireless modem with networking capability

AquaNetwork: Underwater wireless modem with networking capabilityAquaNetwork modems are standard AquaComm modems with added networking capability. Today the need for deploying numerous underwater sensors in a network configuration is growing rapidly. Underwater network applications include:

  1. Pipeline monitoring network, e.g. for subsea oil and gas production
  2. Environmental monitoring
  3. Oceanographic sensor network
  4. Autonomous Underwater Vehicle (AUV) communications

In addition to the standard AquaComm features the AquaNetwork includes the following:

Features Attributes Benefits
Parallel-link capability
  • Modem has true code division multiple access (CDMA) capability
  • Simultaneous links between nodes can co-exist due to CDMA
  • A million possible addresses set with six digit address field
  • Addresses can be set dynamically
  • Parallel links can be set up easily
  • Simplifies networking algorithms
  • Since addresses can be set dynamically, simplifies setting up various network configurations, e.g. for node hopping
Broadcasting
  • Ability to broadcast data and commands to several nodes simultaneously
  • An essential feature to setup networks easily. A common broadcast channel can be allocated with an address.
Broadcast wake up
  • Ability to broadcast wake up command to awaken sleeping nodes simultaneously. This is in addition to the unicast wake up command.
  • For low power consumption, network nodes can be in a low power receive state until woken up by a broadcast
  • Reduce time to wake up sleeping nodes
Simple networking API
  • A networking command set is included
  • Allows third parties to interface and implement networking layer easily


Detailed technical specifications:

Parameter Details
Data rates 100 or 480 bits per second depending on model
Bit Error Rate 10-6 bit error rate or better
Acoustic Doppler Tolerance High immunity to noise and to multi-path and Doppler fading.
Acoustic Doppler tolerance of +/- 5ms-1
Bandwidth Broadband operation 16Khz to 30Khz
Range Tested to 3km range. Longer ranges possible
Modulation Direct sequence spread spectrum / OFDM
Error detection CRC16 error detection
Through water communications protocol Confirmed packet delivery with error detection. If the transmitting end does not receive an acknowledgement, it will resend the data two more times. Number of retries is configurable.
Addressing Uniquely addressable. Six digit numeric address set through host command.
Receive sensitivity Ability to set the receive sensitivity
Transmit power Ability to set the transmit power level
Physical size 8cm x 7cm x 1.5cm (excluding transformer )
Electronics Digital signal processor based
Power supply input voltage DC 5V to 9V
Current consumption @ 6V DC 42mA (nominal) in normal wake operation
4.2mA in power save receive
Less than 150uA in sleep model
External connections 10 pin KK header to connect power, host communications, reset line and wake up line
2 pin terminal to connect hydrophone transducer
Host communications RS232 serial communications.
9600 baud (default),1 start bit, 1 stop bit, no parity
4800, 2400 or 1200 baud programmable
Either TTL voltage levels (3.3V) or RS232 voltage levels selectable
Host command Simple ASCII command set to configure and command the modem
Temperature range -5 degC to +50 degC
Networking Features
Parallel links Code Division Multiple Access (CDMA). Parallel links can be setup for efficient networking. Each link looks like noise to the other.
Broadcast Broadcast mode to communicate with several nodes simultaneously on a CDMA channel. Essential to set up networks.
Store and Forward Store and forward of data packets for Networking
Broadcast wake up Wakeup several sleeping nodes simultaneously on a CDMA channel. Essential for conserving power.
Unicast In addition to the broadcast, unicast is used to talk privately between nodes on a CDMA channel

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