ECCN 6A001

• a.Marine acoustic systems, equipment and specially designed "components" therefor, as follows:
• 1. Active (transmitting or transmitting-and-receiving) systems, equipment and specially designed "components" therefor, as follows:
• a.Depth sounders operating vertically below the apparatus, not including a scanning function exceeding ± 20°, and limited to measuring the depth of water, the distance of submerged or buried objects or fish finding;
• b.Acoustic beacons, as follows:
• 1.a. Acoustic seabed survey equipment as follows:
• 1.a.1. Surface vessel survey equipment designed for sea bed topographic mapping and having all of the following:
• 1.a.1.a. Designed to take measurements at an angle exceeding 20° from the vertical;
• 1.a.1.b. Designed to measure seabed topography at seabed depths exceeding 600 m;
• a.1.a.1.c.'Sounding resolution' less than 2; and
• 1.a.1.d. 'Enhancement' of the depth "accuracy" through compensation for all the following:
• 1.a.1.d.1. Motion of the acoustic sensor;
• 1.a.1.d.2. In-water propagation from sensor to the seabed and back; and
• 1.a.1.d.3. Sound speed at the sensor;
• 1.a.2. Underwater survey equipment designed for seabed topographic mapping and having any of the following:
• 1.a.2.a. Having all of the following:
• 1.a.2.a.1. Designed or modified to operate at depths exceeding 300 m; and
• 1.a.2.a.2. 'Sounding rate' greater than 3,800 m/s; or
• 1.a.2.b. Survey equipment, not specified by 6A001.a.1.a.2.a, having all of the following:
• 1.a.2.b.1. Designed or modified to operate at depths exceeding 100 m;
• 1.a.2.b.2. Designed to take measurements at an angle exceeding 20° from the vertical;
• 1.a.2.b.3. Having any of the following:
• 1.a.2.b.3.a. Operating frequency below 350 kHz; or
• 1.a.2.b.3.b. Designed to measure seabed topography at a range exceeding 200 m from the acoustic sensor; and
• 1.a.2.b.4. 'Enhancement' of the depth "accuracy" through compensation of all of the following:
• 1.a.2.b.4.a. Motion of the acoustic sensor;
• 1.a.2.b.4.b. In-water propagation from sensor to the seabed and back; and
• 1.a.2.b.4.c. Sound speed at the sensor.
• 1.a.3. Side Scan Sonar (SSS) or Synthetic Aperture Sonar (SAS), designed for seabed imaging and having all of the following, and specially designed transmitting and receiving acoustic arrays therefor:
• 1.a.3.a. Designed or modified to operate at depths exceeding 500 m; and
• 1.a.3.b. An 'area coverage rate' of greater than 570 m2/s while operating at the maximum range that it can operate with an 'along track resolution' of less than 15 cm; and
• 1.a.3.c. An 'across track resolution' of less than 15 cm;
• a.1.b Systems or transmitting and receiving arrays, designed for object detection or location, having any of the following:
• 1.b.1. A transmitting frequency below 10 kHz;
• 1.b.2. Sound pressure level exceeding 224dB (reference 1 µPa at 1 m) for equipment with an operating frequency in the band from 10 kHz to 24 kHz inclusive;
• 1.b.3. Sound pressure level exceeding 235 dB (reference 1 µPa at 1 m) for equipment with an operating frequency in the band between 24 kHz and 30 kHz;
• 1.b.4. Forming beams of less than 1° on any axis and having an operating frequency of less than 100 kHz;
• 1.b.5. Designed to operate with an unambiguous display range exceeding 5,120 m; or
• 1.b.6. Designed to withstand pressure during normal operation at depths exceeding 1,000 m and having transducers with any of the following:
• 1.b.6.a. Dynamic compensation for pressure; or
• 1.b.6.b. Incorporating other than lead zirconate titanate as the transduction element;
• 1.c. Acoustic projectors, including transducers, incorporating piezoelectric, magnetostrictive, electrostrictive, electrodynamic or hydraulic elements operating individually or in a designed combination and having any of the following:
• 1.c.1. Operating at frequencies below 10 kHz and having any of the following:
• 1.c.1.a. Not designed for continuous operation at 100% duty cycle and having a radiated 'free-field Source Level (SLRMS)' exceeding (10log(f) + 169.77)dB (reference 1 µPa at 1 m) where f is the frequency in Hertz of maximum Transmitting Voltage Response (TVR) below 10 kHz; or
• 1.c.1.b. Designed for continuous operation at 100% duty cycle and having a continuously radiated 'free-field Source Level (SLRMS)' at 100% duty cycle exceeding (10log(f) + 159.77)dB (reference 1 µPa at 1 m) where f is the frequency in Hertz of maximum Transmitting Voltage Response (TVR) below 10 kHz; or
• 1.c.3. Side-lobe suppression exceeding 22 dB;
• 1.d. Acoustic systems and equipment, designed to determine the position of surface vessels or underwater vehicles and having all of the following, and specially designed "components" therefor:
• 1.d.1. Detection range exceeding 1,000 m; and
• 1.d.2. Determined position error of less than 10 m rms (root mean square) when measured at a range of 1,000 m;
• a.Equipment using coherent "signal processing" between two or more beacons and the hydrophone unit carried by the surface vessel or underwater vehicle;
• b.Equipment capable of automatically correcting speed-of-sound propagation errors for calculation of a point.
• 1.e. Active individual sonars, specially designed or modified to detect, locate and automatically classify swimmers or divers, having all of the following, and specially designed transmitting and receiving acoustic arrays therefor:
• 1.e.1. Detection range exceeding 530 m;
• 1.e.2. Determined position error of less than 15 m rms (root mean square) when measured at a range of 530 m; and
• 1.e.3. Transmitted pulse signal bandwidth exceeding 3 kHz;
• 2. Passive systems, equipment and specially designed "components" therefor, as follows:
• 2.a. Hydrophones having any of the following:
• 2.a.1. Incorporating continuous flexible sensing elements;
• 2.a.2. Incorporating flexible assemblies of discrete sensing elements with either a diameter or length less than 20 mm and with a separation between elements of less than 20 mm;
• 2.a.3. Having any of the following sensing elements:
• 2.a.3.a. Optical fibers;
• 2.a.3.b. 'Piezoelectric polymer films' other than polyvinylidene-fluoride (PVDF) and its co-polymers {P(VDF-TrFE) and P(VDF-TFE)};
• 2.a.3.c. 'Flexible piezoelectric composites';
• 2.a.3.d. Lead-magnesium- niobate/lead-titanate (i.e., Pb(Mg1/3Nb2/3)O3-PbTiO3, or PMN-PT) piezoelectric single crystals grown from solid solution; or
• 2.a.3.e. Lead-indium-niobate/lead-magnesium niobate/lead-titanate (i.e., Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3, or PIN-PMN-PT) piezoelectric single crystals grown from solid solution;
• 2.a.4. A 'hydrophone sensitivity' better than −180dB at any depth with no acceleration compensation;
• 2.a.5. Designed to operate at depths exceeding 35 m with acceleration compensation; or
• 2.a.6. Designed for operation at depths exceeding 1,000 m and having a 'hydrophone sensitivity' better than −230 dB below 4 kHz;
• 2.b. Towed acoustic hydrophone arrays having any of the following:
• 2.b.1. Hydrophone group spacing of less than 12.5 m or 'able to be modified' to have hydrophone group spacing of less than 12.5 m;
• 2.b.2. Designed or 'able to be modified' to operate at depths exceeding 35m;
• 2.b.3. Heading sensors controlled by 6A001.a.2.d;
• 2.b.4. Longitudinally reinforced array hoses;
• 2.b.5. An assembled array of less than 40 mm in diameter;
• 2.b.7. Hydrophone characteristics controlled by 6A001.a.2.a; or
• 2.b.8. Accelerometer-based hydro-acoustic sensors specified by 6A001.a.2.g;
• 2.c. Processing equipment, specially designed for towed acoustic hydrophone arrays, having "user-accessible programmability" and time or frequency domain processing and correlation, including spectral analysis, digital filtering and beamforming using Fast Fourier or other transforms or processes;
• 2.d. Heading sensors having all of the following:
• 2.d.1. An "accuracy" of better than ± 0.5°; and
• 2.d.2. Designed to operate at depths exceeding 35 m or having an adjustable or removable depth sensing device in order to operate at depths exceeding 35 m;
• 2.e. Bottom or bay-cable hydrophone arrays having any of the following:
• 2.e.1. Incorporating hydrophones controlled by 6A001.a.2.a;
• 2.e.2. Incorporating multiplexed hydrophone group signal modules having all of the following characteristics:
• 2.e.2.a. Designed to operate at depths exceeding 35 m or having an adjustable or removal depth sensing device in order to operate at depths exceeding 35 m; and
• 2.e.2.b. Capable of being operationally interchanged with towed acoustic hydrophone array modules; or
• 2.e.3. Incorporating accelerometer-based hydro-acoustic sensors specified by 6A001.a.2.g;
• 2.f. Processing equipment, specially designed for bottom or bay cable systems, having "user-accessible programmability" and time or frequency domain processing and correlation, including spectral analysis, digital filtering and beamforming using Fast Fourier or other transforms or processes;
• 2.g. Accelerometer-based hydro-acoustic sensors having all of the following:
• 2.g.1. Composed of three accelerometers arranged along three distinct axes;
• 2.g.2. Having an overall 'acceleration sensitivity' better than 48 dB (reference 1,000 mV rms per 1g);
• 2.g.3. Designed to operate at depths greater than 35 meters; and
• 2.g.4. Operating frequency below 20 kHz;
• b.Correlation-velocity and Doppler-velocity sonar log equipment designed to measure the horizontal speed of the equipment carrier relative to the sea bed, as follows:
• 1. Correlation-velocity sonar log equipment having any of the following characteristics:
• 1.a. Designed to operate at distances between the carrier and the sea bed exceeding 500 m; or
• 1.b. Having speed "accuracy" better than 1% of speed;
• 2. Doppler-velocity sonar log equipment having speed "accuracy" better than 1% of speed;
• a.Measuring the depth of water;
• b.Measuring the distance of submerged or buried objects; or
• c.Fish finding.

3 items reserved by BIS (not shown)