Underwater Telemetry Modem - DATUM

View 3D   More Pictures   Brochures   Manuals

The CDL DATUM (Digital Acoustic Transponder & Underwater Modem )system uses state of the art spread spectrum and digital signal processing technology to offer a long range high speed device for use in ranging and data applications in deep water. Purpose designed algorithms provide high reliability data communications with a bit error rate of 10 e-6 or better with very high immunity to noise, Doppler fading and multi-path effects. Each unit is identified by a unique address allowing network functionality. Data can be sent or received from any DATUM in the network providing improved redundancy. By using direct sequence spread spectrum/OFDM the power requirements for the system are kept far lower than most competitive systems and the DATUM provides class leading battery life. The DATUM is available in ship/ROV mount version or with integrated battery pack.   Features: High accuracy ranging High speed modem High reliability Vessel/ROV/Seabed mount Networkable Spread spectrum technology Low power Small size     DATUM Specifications Depth:                                                                                                                                   3,000m Range:                                                                                                                                  3km approx (Line of Sight) Communications Specifications: Date Rates                                                            100 or 480 bits per second Bit Error Rate                                                        10-6  bit error rate or better Acoustic Doppler Tolerance                              High immunity to noise and to multi-path and Doppler                                                                                   Fading tolerance of +/- 5ms-1                    Bandwith                                                               Broadband operation 16Khz to 30Khz              Modulation                                                            Direct sequence spread spectrum/ OFDM   Error Detection                                                     CRC16 error detection                                           Telemetry Interface:   Digital Interface                                                   RS232   Output Rate                                                           1200, 2400, 4800, 9600 baud   Electrical Connection                                         Burton 8 pin Connector     Power Requirements:        Operating Voltage                                               18-30VDC   Power Rating:                               Listen Mode                                          1 watts approx @18VDC                   Transmit Mode                                     3.5 watts approx @18VDC     Weights and Dimensions:   Physical Sizes:       Housing Diameter                                               120mm   Transducer Head Diameter                              80mm   Total Height                                                          193mm   Weight in Air                                                         3kg   Weight in Water                                                   1kg