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13.4 Power Requirements
The basic over the side installation of the Sonic MBES systems consists of the sonar head, projector,
SIM box, sound velocity probe, and interconnecting cables. The sonar head, SIM, and computer(s)
communicate via 100BASE-T or 1000BASE-T (Gigabit) full-duplex Ethernet.
Installation in an ROV requires an Ethernet media converter to convert copper to fibre optic and
back to copper media to accommodate long tethers. On shorter ROV tethers (less than 1000
metres), using impedance controlled twisted-pair copper wire and a DSL modem may be possible.
Remote or autonomous vehicles typically supply the 48-volt power to the sonar head and the SIM
Controller board.
2024 head connected to SIM, equivalent to
over the side installation.
Conditions: 30m range, Tx power = 215 dB,
2022 head connected to SIM, equivalent to
over the side installation.
Conditions: 30m range, Tx power = 215 dB,
2.1A Average
30m range, Tx power = 215 dB, pulse width =
50us.
1.05 A average
1.77 A peak after transmit
30m range, Tx power = 215 dB, pulse width =
50us.
0.70A average
30m range, Tx power = 215 dB, pulse width =
50us.
48V, 78mA (gigabit)
48V, 51mA (100BASE-T)
No connections except Ethernet.
Table 20: Systems Power Requirements
In an ROV or AUV installation, the sonar head and SIM Controller board require 48VDC, supplied by
the vehicle power system. During the receive cycle, the power required is 55 watts for the 2026,
50W for the 2024, and 35 watts for the 2022. The peak current draw occurs just after transmission
when the capacitor bank recharges. See below figures for current waveforms. If a separate power
supply for the sonar is required, it should be rated 120 to 150 watts or higher.
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