|
LADS
The Laser Airborne Depth Sounder (LADS) Flight was a unit of the Royal Australian Navy. Unlike the rest of the flying units of the RAN, it was not controlled by the Fleet Air Arm from , but instead fell under the operational control of the Australian Hydrographic Service at , providing a platform for the operation of the laser airborne depth sounder system. LADS Flight conducted its last sortie on 7 November 2019. History In the 1970s, the Royal Australian Navy's Hydrographic Service was still limited in its ability to survey the vastness of Australia's coastal waters, and was still producing charts on areas where surveying was incomplete or had not even taken place. As a consequence, the RAN began to search for a way of effectively surveying the Australian coastline from the air, which led to the development of the Laser Airborne Depth Sounder system by the Defence Science and Technology Organisation, a part of the Australian Department of Defence, with trials beginning in 1977.Sl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Laser Airborne Depth Sounder
The Laser Airborne Depth Sounder (LADS) Flight was a unit of the Royal Australian Navy. Unlike the rest of the flying units of the RAN, it was not controlled by the Fleet Air Arm from , but instead fell under the operational control of the Australian Hydrographic Service at , providing a platform for the operation of the laser airborne depth sounder system. LADS Flight conducted its last sortie on 7 November 2019. History In the 1970s, the Royal Australian Navy's Hydrographic Service was still limited in its ability to survey the vastness of Australia's coastal waters, and was still producing charts on areas where surveying was incomplete or had not even taken place. As a consequence, the RAN began to search for a way of effectively surveying the Australian coastline from the air, which led to the development of the Laser Airborne Depth Sounder system by the Defence Science and Technology Organisation, a part of the Australian Department of Defence, with trials beginning in 197 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fleet Air Arm (RAN)
The Fleet Air Arm (FAA), known formerly as the Australian Navy Aviation Group, is the division of the Royal Australian Navy (RAN) responsible for the operation of aircraft. The FAA was founded in 1947 following the purchase of two aircraft carriers from the Royal Navy. FAA personnel fought in the Korean War (operating from the carrier ) and the Vietnam War (attached to a Royal Australian Air Force squadron and a United States Army Aviation company), and participated in later conflicts and operations from host warships. Initially operating only fixed-wing aircraft, helicopters were first acquired by the FAA in 1952, forming Australia's first helicopter squadron. Helicopter usage increased over time, particularly after 1982, when the carrier was decommissioned and not replaced. In 2000, following the removal from service of the land-based Hawker Siddeley HS 748 aircraft, the FAA became an all-helicopter force, operating in the anti-submarine warfare and maritime support roles. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Surveillance Australia
Surveillance Australia Pty Ltd (formerly ''Cobham Aviation Services Australia - Special Mission'') is an Australian aviation company. It is primarily engaged in servicing the Australian Border Force Coastwatch contract, flying surveillance patrols within the Australian Exclusive Economic Zone (AEEZ). History Surveillance Australia was established in 1994 by National Jet Systems as a subsidiary to operate fixed-wing aerial surveillance aircraft and patrols on behalf of the Australian Customs Service Coastwatch operations. In 1999, National Jet Systems and its subsidiaries including Surveillance Australia, were acquired by Cobham plc for £24.5 million. In 2006, Surveillance Australia was awarded the 1 billion Coastwatch contract that will see its aircraft operating through to 2020. This contract saw operations be restricted to only 10 de Havilland Canada Dash 8 aircraft, retiring the previously mixed fleet including the Reims F406 Caravan II. This contract was due to be succee ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Australian Hydrographic Service
The Australian Hydrographic Service (formerly known as the Royal Australian Navy Hydrographic Service) is the Australian Commonwealth Government agency responsible for providing hydrographic services that meet Australia's obligations under the SOLAS convention and the national interest; enabling safe navigation, maritime trade and supporting protection of the marine environment. The agency, headquartered at the Australian Hydrographic Office in Wollongong, New South Wales, is an element of the Royal Australian Navy (RAN), and serves both military and civilian functions. The names Australian Hydrographic Service and the Australian Hydrographic Office are commonly abbreviated as AHS or AHO respectively. Role The Australian Hydrographic Service is an element of the RAN, and serves both military and civilian functions. The headquarters of the agency is at the Australian Hydrographic Office in Wollongong, New South Wales.Slade, in Oldham, ''100 Years of the Royal Australian Navy'', p. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ship's Badge
Naval heraldry is a form of identification used by naval vessels from the end of the 19th century onwards, after distinguishing features such as figureheads and gilding were discouraged or banned by several navies. Naval heraldry commonly takes the form of a badge, seal, crest, or coat of arms designed specifically for a ship (or a series of ships bearing the same name), which in Commonwealth navies takes the form of a large plaque, referred to as the ship's badge, mounted on the superstructure of the ship, and in the United States Navy is known as the ship's seal or ship's crest, and is primarily found on crew uniform patches. An item of naval heraldry is seen as the identifying logo of the vessel, and is commonly reproduced on hats, stationery, trophies, souvenirs, and gifts related to the ship. In many navies, the ship's badge is also displayed on the tampions – the covers for the gun muzzles. The naval heraldric tradition follows the heraldic traditions of the country, wi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nautical Chart
A nautical chart is a graphic representation of a sea area and adjacent coastal regions. Depending on the scale of the chart, it may show depths of water and heights of land ( topographic map), natural features of the seabed, details of the coastline, navigational hazards, locations of natural and human-made aids to navigation, information on tides and currents, local details of the Earth's magnetic field, and human-made structures such as harbours, buildings, and bridges. Nautical charts are essential tools for marine navigation; many countries require vessels, especially commercial ships, to carry them. Nautical charting may take the form of charts printed on paper (raster navigational charts) or computerized electronic navigational charts. Recent technologies have made available paper charts which are printed "on demand" with cartographic data that has been downloaded to the commercial printing company as recently as the night before printing. With each daily download, cri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Airborne Lidar Bathymetry
Lidar (, also LIDAR, or LiDAR; sometimes LADAR) is a method for determining ranges (variable distance) by targeting an object or a surface with a laser and measuring the time for the reflected light to return to the receiver. It can also be used to make digital 3-D representations of areas on the Earth's surface and ocean bottom of the intertidal and near coastal zone by varying the wavelength of light. It has terrestrial, airborne, and mobile applications. ''Lidar'' is an acronym of "light detection and ranging" or "laser imaging, detection, and ranging". It is sometimes called 3-D laser scanning, a special combination of 3-D scanning and laser scanning. Lidar is commonly used to make high-resolution maps, with applications in surveying, geodesy, geomatics, archaeology, geography, geology, geomorphology, seismology, forestry, atmospheric physics, laser guidance, airborne laser swath mapping (ALSM), and laser altimetry. It is also used in control and navigation for some aut ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrographic Surveying
Hydrographic survey is the science of measurement and description of features which affect maritime navigation, marine construction, dredging, offshore oil exploration/ offshore oil drilling and related activities. Strong emphasis is placed on soundings, shorelines, tides, currents, seabed and submerged obstructions that relate to the previously mentioned activities. The term ''hydrography'' is used synonymously to describe ''maritime cartography'', which in the final stages of the hydrographic process uses the raw data collected through hydrographic survey into information usable by the end user. Hydrography is collected under rules which vary depending on the acceptance authority. Traditionally conducted by ships with a sounding line or echo sounding, surveys are increasingly conducted with the aid of aircraft and sophisticated electronic sensor systems in shallow waters. Organizations National and International Maritime Hydrography Hydrographic offices evolved fr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Age Of Sail
The Age of Sail is a periodization, period that lasted at the latest from the mid-16th century, 16th (or mid-15th century, 15th) to the mid-19th century, 19th centuries, in which the dominance of sailing ships in globalization, global trade and warfare culminated, particularly marked by the introduction of Naval artillery in the Age of Sail, naval artillery, and ultimately reached its highest extent at the advent of the analogue Steam power during the Industrial Revolution, Age of Steam. Enabled by the advances of the related Maritime history#Age of Navigation, Age of Navigation, it is identified as a distinctive element of the early modern period and the Age of Discovery. Especially in context of the latter, it refers to a more particular Eurocentric Age of Sail, while generally the Age of Sail is the culminating period of a long intercontinental Sailing#History, history of sailing. Periodization Like most History by period, periodic eras, the definition is inexact but instead ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Second-harmonic Generation
Second-harmonic generation (SHG, also called frequency doubling) is a nonlinear optical process in which two photons with the same frequency interact with a nonlinear material, are "combined", and generate a new photon with twice the energy of the initial photons (equivalently, twice the frequency and half the wavelength), that conserves the coherence of the excitation. It is a special case of sum-frequency generation (2 photons), and more generally of harmonic generation. The second-order nonlinear susceptibility of a medium characterizes its tendency to cause SHG. Second-harmonic generation, like other even-order nonlinear optical phenomena, is not allowed in media with inversion symmetry (in the leading electric dipole contribution). However, effects such as the Bloch–Siegert shift (oscillation), found when two-level systems are driven at Rabi frequencies comparable to their transition frequencies, will give rise to second harmonic generation in centro-symmetric systems ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hertz
The hertz (symbol: Hz) is the unit of frequency in the International System of Units (SI), equivalent to one event (or cycle) per second. The hertz is an SI derived unit whose expression in terms of SI base units is s−1, meaning that one hertz is the reciprocal of one second. It is named after Heinrich Rudolf Hertz (1857–1894), the first person to provide conclusive proof of the existence of electromagnetic waves. Hertz are commonly expressed in multiples: kilohertz (kHz), megahertz (MHz), gigahertz (GHz), terahertz (THz). Some of the unit's most common uses are in the description of periodic waveforms and musical tones, particularly those used in radio- and audio-related applications. It is also used to describe the clock speeds at which computers and other electronics are driven. The units are sometimes also used as a representation of the energy of a photon, via the Planck relation ''E'' = ''hν'', where ''E'' is the photon's energy, ''ν'' is its frequency ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
