MicronModem Underwater Acoustic Modem - Tritech

The Micron Modem has been designed to provide a reliable data link for through water communications where there are limitations on space and/or power. Suitable for use as a standalone system or part of an AUV control system. The Micron Modem provides robust spread spectrum data transmission from an extremely compact and low cost unit. Due to its miniature size and low weight, the Micron Modem is suitable for a host of potential sub-sea data transfer applications that were previously impractical or uneconomic with larger, more expensive systems. The system is able to transmit a maximum data rate of 40 bits per second, making it suitable for a range of through-water, low data rate transfer requirements. The Micron Modem can also be configured as a transponder or responder, to operate with a Tritech USBL transducer as part of a MicronNav 200 positioning system. The Micron Modem is also available as a battery powered option in the Tritech Micron Battery Modem about which more information can be found on the Tritech website.

Applications

• Through water communications
• AUV control and data collection

Benefits

• Multipath noise rejection
• Compact size y Easy to install

Features

• Low error rate
• Low power consumption
• 500m horizontal range
• 150m vertical range

Key Specification

• Range   500m horizontal, 150m  vertical
• Doppler tolerance   ±5m/s
• Depth rating   750m 
• Weight in water   0.08kg

Acoustic specification

• Frequency band 20 - 28kHz
• Data rate 40bits/s or 100bits/s (spread spectrum)
• Range 500m horizontal, 150m vertical
• Minimum signal to noise ratio -6dB (in band)
• Multipath rejection Maximum delay spread of 10 - 100ms
• Transmitter source 169dB re 1μPa at 1m
• Doppler tolerance ±5m/s

Electrical and Communication

• Communications protocol RS232 or RS485
• Power supply 12 - 48V DC
• Power consumption 3.5W transmitting 0.28W receiving

Physical specification

• Weight in air 0.24kg 
• Weight in water 0.08kg
• Depth rating 750m 
• Temperature rating (operational)-10°C to 35°C 
• Temperature rating (storage)-20°C to 50°C