Modular Hydro Acoustic Modem – HAM.NODE
HAM.NODE, our hydro acoustic modem, is a powerful and reliable underwater communication system. It is designed the meet the requirements of research and exploration, established in various subsea communication projects.
By flexible tasks modulation and coding, a variety of available transducers in different frequency bands, high maximum transmit power, power efficiency and flexible interfaces a powerful solution for demanding subsea communication is ensured. An applicable communication allows direct connection of wide variety sensors, mechanical robustness and superior corrosion resistance of our synthetic pressure housings. The overall performance exceeds those of competing systems and enables subsea communications not solvable so far.
| Data Transmission Characteristics |
| - Broadband data transmission via OFDM-mDPSK with optional FS-DF equalizer or via n-mFSK |
| - Data compression |
| - Two-phase Doppler compensation for relative movements up to ±12m/s and acceleration up to 1g |
| - Convolutional error correction and checksum validation |
| - Automatic retransmission of damaged data packets in bidirectional communication mode |
| Frequency Bands |
| - Long range LF configurations available upon request |
| - 8-13kHz (MF) |
| - 11-20kHz (MF) |
| - 17-29kHz (MHF) |
| Transducer Options |
| Mounting direct to housing or detached (optional) |
| - LF: toroidal |
| - MF: omnidirectional, 240° -3dB beam width |
| - MF: directional, 65° -3dB beam width |
| - MHF: directional60° -3dB beam width |
| Net User Data Rates |
| Real-Life Values: |
| >7000bps @ 1,950m vertical (OFDM-mDPSK) |
| ~ 3400bps @ 6,000m vertical (OFDM-mDPSK) |
| ~ 145bps @ 30,000m horizontal (n-mFSK) |
| User Data Bit Error Rate |
| 0, provided a transmission is possible at all |
| Data Storage |
| - SDHC card, exchangeable |
| - Currently up to 32GB max. |
| - User accessible FAT32 file system |
| Internal Sensors and Features |
| - Precision time base, <0.03ppm drift per year (optional) |
| - 3-axis acceleration sensor |
| - Housing pressure, temperature, humidity (optional) |
| - Supply voltages |
| - Further options are available upon request |
| Customizable Functionally |
| - Scheduled transmission |
| - Data logging on internal SDHC card |
| - Passive recording and active polling of sensor data |
| - Event based triggering |
| - Control of attached devices |
| - Further options are available upon request |
| Interfaces |
| - 2 serial ports, Subconn® BH10F connectors |
| - RS232 / RS422 (software selectable) |
| - Baud rate up to 230kbaud (software selectable) |
| - CAN-bus interface (optional) |
| - Additional interfaces are available upon request |
| Electrical Characteristics |
| - Supply voltage 11 to 33V DC (below 18V limited transmit power) |
| - Sleep mode power consumption < 3mW |
| - Acoustic standby mode < 30mW |
| - Mean time between servicing up to 60 months with external battery housing |
| Weights and Dimensions |
| - Housing options: |
| Modular Composite Housing SW.MCH (750m) / DW.MCH (6,000m) |
| - Housing dimensions (w/o transducer and connectors attached): |
| SW.MCH / DW.MCH: D=153mm, L=630mm |
| - Weight in air (with MF directional transducer and connector, w/o batteries): |
| SW.MCH: 13.6kg / DW.MCH: 17.5kg |
| - Displacement (with MF directional transducer and connector): |
| SW.MCH / DW.MCH: 10.2l |
develogic has been chosen as the sole provider of hydro acoustic communication solutions for the German Indonesian Tsunami Early Warning System (GITEWS) after extensive benchmarking of various international competitors.
Multiple HAM.NODE LF long range systems, deployed in the Fram strait between Svalbard and Greenland as part of the European DAMOCLES project, transmit ocean current data between moorings across distances of up to 30,000m.
A PACT system, deployed in November 2007 near the Canary Islands as part of the GITEWS project, still proves a transmission reliability rate of better than 98% even under heavy weather conditions across ~3,900m distance. This system is equipped with a HAM.NODE OEM modem communicating with the DOLAN surface buoy. A HAM.ISDB Iridium Satellite Communication Module relays the bottom sensor data to the German Alfred Wegener Institute for Polar and Marine Research in Bremerhaven.
For other examples of our track record please visit our page Worldwide Applications.