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- Laser_airborne_depth_sounder abstract "Laser airborne depth sounder (LADS) is an aircraft-based hydrographic surveying system used by the Australian Hydrographic Service (AHS). The system uses the difference between the sea surface and the sea floor as calculated from the aircraft's altitude to generate hydrographic data.The lack of progress made in surveying Australia's territorial waters, most of which was unsurveyed or relying on Age of Sail-era charts prompted the Royal Australian Navy to seek a method of effectively surveying large areas from the air in the 1970s. The Defence Science and Technology Organisation developed the LADS system, with feasibility trials beginning 1977.The LADS system is built around a Nd:YAG laser, which emits an infra-red beam at 990 hertz. The beam is frequency doubled to produce a green laser. This is split into two beams, one infra-red, one green, by an optical coupler, with the infra-red beam aimed directly below the aircraft, and the green beam directed across the target area with a scanning mirror. The infra-red laser does not penetrate the water's surface, and its reflected pulse indicates the height of the aircraft above the surface. However, the green laser penetrates to the ocean floor, and the return pulse from the green laser indicates the height of the aircraft from the ocean floor; the difference between the two values is used to calculate the water's depth. The data from the lasers is not processed aboard the aircraft, but instead by a ground support team, with aircraft flight data and global positioning system information used to help generate hydrographic readings. The aircraft makes multiple, overlapping passes of the target area to ensure accurate data is collected. The LADS system is capable of taking 990 soundings per second, with data points positioned 2 to 6 metres (6 ft 7 in to 19 ft 8 in) apart across a swath up to 288 metres (945 ft) wide. The system is capable of working with waters up to 70 metres (230 ft) deep, and can be modified to perform land surveys of areas with an altitude variance less than 50 metres (160 ft)LADS entered service with the AHS in 1993. The equipment was initially fitted to a Fokker F27 aircraft. In 2010, the system was installed in a De Havilland Dash 8 aircraft. This is operated by the Laser Airborne Depth Sounder Flight of the Royal Australian Navy.".
- Laser_airborne_depth_sounder thumbnail De_Havilland_Canada_DHC-8-200_VH-LCL.jpg?width=300.
- Laser_airborne_depth_sounder wikiPageExternalLink index.php.
- Laser_airborne_depth_sounder wikiPageID "2093300".
- Laser_airborne_depth_sounder wikiPageLength "3895".
- Laser_airborne_depth_sounder wikiPageOutDegree "20".
- Laser_airborne_depth_sounder wikiPageRevisionID "679431971".
- Laser_airborne_depth_sounder wikiPageWikiLink Age_of_Sail.
- Laser_airborne_depth_sounder wikiPageWikiLink Australian_Hydrographic_Service.
- Laser_airborne_depth_sounder wikiPageWikiLink Bombardier_Dash_8.
- Laser_airborne_depth_sounder wikiPageWikiLink Category:Hydrography.
- Laser_airborne_depth_sounder wikiPageWikiLink Category:Military_equipment_of_the_Royal_Australian_Navy.
- Laser_airborne_depth_sounder wikiPageWikiLink De_Havilland_Dash_8.
- Laser_airborne_depth_sounder wikiPageWikiLink Defence_Science_and_Technology_Organisation.
- Laser_airborne_depth_sounder wikiPageWikiLink Depth_sounding.
- Laser_airborne_depth_sounder wikiPageWikiLink Fokker_F27.
- Laser_airborne_depth_sounder wikiPageWikiLink Fokker_F27_Friendship.
- Laser_airborne_depth_sounder wikiPageWikiLink Global_Positioning_System.
- Laser_airborne_depth_sounder wikiPageWikiLink Global_positioning_system.
- Laser_airborne_depth_sounder wikiPageWikiLink Hertz.
- Laser_airborne_depth_sounder wikiPageWikiLink Hydrographic_survey.
- Laser_airborne_depth_sounder wikiPageWikiLink Hydrographic_surveying.
- Laser_airborne_depth_sounder wikiPageWikiLink Laser_Airborne_Depth_Sounder_Flight_RAN.
- Laser_airborne_depth_sounder wikiPageWikiLink Nautical_chart.
- Laser_airborne_depth_sounder wikiPageWikiLink Nd:YAG_laser.
- Laser_airborne_depth_sounder wikiPageWikiLink Optical_coupler.
- Laser_airborne_depth_sounder wikiPageWikiLink Opto-isolator.
- Laser_airborne_depth_sounder wikiPageWikiLink Royal_Australian_Navy.
- Laser_airborne_depth_sounder wikiPageWikiLink Scanning_mirror.
- Laser_airborne_depth_sounder wikiPageWikiLink Second-harmonic_generation.
- Laser_airborne_depth_sounder wikiPageWikiLink File:De_Havilland_Canada_DHC-8-200_VH-LCL.jpg.
- Laser_airborne_depth_sounder wikiPageWikiLinkText "Laser airborne depth sounder".
- Laser_airborne_depth_sounder wikiPageWikiLinkText "laser airborne depth sounder".
- Laser_airborne_depth_sounder hasPhotoCollection Laser_airborne_depth_sounder.
- Laser_airborne_depth_sounder wikiPageUsesTemplate Template:Cite_book.
- Laser_airborne_depth_sounder wikiPageUsesTemplate Template:Convert.
- Laser_airborne_depth_sounder wikiPageUsesTemplate Template:Redirect.
- Laser_airborne_depth_sounder wikiPageUsesTemplate Template:Reflist.
- Laser_airborne_depth_sounder subject Category:Hydrography.
- Laser_airborne_depth_sounder subject Category:Military_equipment_of_the_Royal_Australian_Navy.
- Laser_airborne_depth_sounder hypernym System.
- Laser_airborne_depth_sounder comment "Laser airborne depth sounder (LADS) is an aircraft-based hydrographic surveying system used by the Australian Hydrographic Service (AHS).".
- Laser_airborne_depth_sounder label "Laser airborne depth sounder".
- Laser_airborne_depth_sounder sameAs m.06lnpr.
- Laser_airborne_depth_sounder sameAs Q6493034.
- Laser_airborne_depth_sounder sameAs Q6493034.
- Laser_airborne_depth_sounder wasDerivedFrom Laser_airborne_depth_sounder?oldid=679431971.
- Laser_airborne_depth_sounder depiction De_Havilland_Canada_DHC-8-200_VH-LCL.jpg.
- Laser_airborne_depth_sounder isPrimaryTopicOf Laser_airborne_depth_sounder.