Kongsberg EM122

 (MI_Instrument) uuid: 9da1f3f0-9ec8-11e1-a8b0-0800200c9a66
    citation:  (CI_Citation)
        title:  Kongsberg EM122 Multibeam Echosounder
        date:  unknown
        identifier:  (MD_Identifier)
            code:  EM122
        citedResponsibleParty:  (CI_ResponsibleParty)
            organisationName:  Kongsberg Maritime
            contactInfo:  (CI_Contact)
                phone:  (CI_Telephone)
                    voice:  +47 214 98 364
                    facsimile:  +47 322 85 014
                address:  (CI_Address)
                    deliveryPoint:  P.O. Box 483
                    deliveryPoint:  NO-3601
                    city:  Kongsberg
                    country:  Norway
                    electronicMailAddress:  km.support@kongsberg.com
                onlineResource:  (CI_OnlineResource)
                    linkage:   http://www.km.kongsberg.com/ks/web/nokbg0240.nsf/AllWeb/01FB0F22974EA50FC125715E002B2143?OpenDocument
                    name:  Kongsberg EM122 information
                    description:  Information on the Kongsberg EM122 multibeam sonar system
                    function:  (CI_OnLineFunctionCode) information
            role:  (CI_RoleCode) resourceProvider
    identifier:  (MD_Identifier)
        code:  Kongsberg EM122
    type:  Multibeam Echosounder
    description:   EM 122 multibeam echosounder is a high performance echosounder for deep water mapping with up to 288 simultaneous beams. The EM 122 is designed to perform seabed mapping to full ocean depth with an unsurpassed resolution, coverage and accuracy. The system is cost effective, reliable, and easily operated. The design of the EM 122 is based on more than 50 years of hydrographic experience with echo sounders, sonars and underwater positioning for civilian and military use. It is the latest model in a series of deep sea multibeam echo sounders started with the EM 12 in 1990 and followed by the EM 121 and the EM 120, of which about 40 systems are operational. It uses the same transducers as in the EM 120 but with new electronics and software. Compared with the EM 120 the EM 122 has up to four times the resolution in terms of sounding density through inclusion of multiping capability and more than twice the number of detections per swath. High density signal processing is a major improvement, to keep the acoustic footprint size small even for the outer beams in the swath. In typical ocean depths a sounding spacing of about 50 m across and along is achievable. The achievable swath width of the EM 122 is in the order of 30,000 m, or about 25% more than possible with the EM 120. This is obtained by using long FM chirps which gains about 15 dB in signal to noise ratio compared to CW pulses. The EM 122 is a complete system. All necessary sensor interfaces, data displays for quality control and sensor calibration, seabed visualization, and data logging are a standard part of the system, as is integrated seabed acoustical imaging capability (side scan). Including a higher frequency multibeam echo sounder such as EM 710 with the EM 122 system can give a total system solution meeting the strictest IHO requirements for all water depths. As proven with the EM 120, an accuracy of better than 0.2% of depth in deep waters is readily achievable with the EM 122.