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| {{Two other uses|underwater sound propagation|atmospheric sounding|SODAR|other uses|Sonar (disambiguation)}} | |||
| {{TOCright}} | |||
| ] (here, ]) are fitted with VDS (Variable Depth Sonar) type DUBV43 or DUBV43C towed sonars]] | |||
| '''Sonar''' (originally an ] for '''sound navigation and ranging''') is a technique that uses ] propagation (usually underwater) to ], communicate with or detect other vessels. There are two kinds of sonar: active and passive. Sonar may be used as a means of ] and of measurement of the echo characteristics of "targets" in the water. ] in air was used before the introduction of ]. Sonar may also be used in air for robot navigation, and ] (an upward looking in-air sonar) is used for atmospheric investigations. The term ''sonar'' is also used for the equipment used to generate and receive the sound. The frequencies used in sonar systems vary from ] to ]. The study of underwater sound is known as ] or sometimes ]. | |||
| ==History== | |||
| Although some animals (dolphins and bats) have used sound for communication and object detection for millions of years, use by humans in the water is initially recorded by ] in 1490: a tube inserted into the water was said to be used to detect vessels by placing an ear to the tube. | |||
| In the 19th century an underwater bell was used as an ancillary to ] to provide warning of hazards. | |||
| The use of sound to 'echo locate' underwater in the same way as ]s use sound for aerial navigation seems to have been prompted by the ] disaster of 1912. The world's first ] for an underwater echo ranging device was filed at the British ] by English meteorologist ], one month after the sinking of the Titanic, and a German physicist ] obtained a patent for an echo sounder in 1913. Canadian ], while working for the Submarine Signal Company in Boston, built an experimental system beginning in 1912, a system later tested in Boston Harbor, and finally in 1914 from the U.S. Revenue (now Coast Guard) Cutter Miami on the ] off ] Canada. In that test, Fessenden demonstrated depth sounding, underwater communications (]) and echo ranging (detected an iceberg at two miles (3 km) range). The so-called ] ], at ca. 500 Hz frequency, was unable to determine the bearing of the berg due to the 3 meter wavelength and the small dimension of the transducer's radiating face (less than 1 meter in diameter). The ten ]-built ]s launched in 1915 were equipped with a ].<ref></ref>. It is one of the most useful devices. | |||
| During ] the need to detect ]s prompted more research into the use of sound. The British made early use of underwater hydrophones, while the French physicist ], working with a Russian émigré electrical engineer, ], worked on the development of active sound devices for detecting submarines in 1915 using quartz. Although ] and magnetostrictive transducers later superseded the ] transducers they used, this work influenced future designs. Lightweight sound sensitive plastic film and fibre optics have been used for ] (acousto-electric transducers for in-water use), while ] and PMN (lead magnesium niobate) have been developed for projectors. Piezoelectric composite materials are available from several manufacturers including ]. | |||
| ===ASDIC=== | |||
| In 1916, under the British Board of Invention and Research, Canadian physicist ] took on the active sound detection project with ], producing a prototype for testing in mid-1917. This work, for the Anti-Submarine Division, was undertaken in utmost secrecy, and used quartz piezoelectric crystals to produce the world's first practical underwater active sound detection apparatus. To maintain secrecy no mention of sound experimentation or quartz was made - the word used to describe the early work ('supersonics') was changed to 'ASD'ics, and the quartz material 'ASD'ivite. From this came the British acronym ''ASDIC''. In 1939, in response to a question from the ], the Admiralty made up the story that the letters stood for 'Allied Submarine Detection Investigation Committee', and this is still widely believed, though no committee bearing this name has ever been found in the Admiralty archives.<ref name="Hackmann">W Hackmann, Seek & Strike: Sonar, anti-submarine warfare and the Royal Navy 1914-54 (HMSO, London, 1984) </ref> | |||
| By 1918, both the ] and ] had built active systems, though the British were well in advance of the US. They tested their ASDIC on ] in 1920, and started production in 1922. The 6th Destroyer Flotilla had ASDIC-equipped vessels in 1923. An anti-submarine school, ], and a training ] of four vessels were established on ] in 1924. The U.S. Sonar QB set arrived in 1931. | |||
| By the outbreak of ], the ] had five sets for different surface ship classes, and others for submarines, incorporated into a complete anti-submarine attack system. The effectiveness of early ASDIC was limited by the use of the ] as an anti-submarine weapon. This required an attacking vessel to pass over a submerged contact before dropping charges over the stern, resulting in a loss of ASDIC contact in the moments prior to attack. The hunter was effectively firing blind, during which time a submarine commander was able to take evasive action. This situation was remedied by using several ships cooperating and by the adoption of "ahead throwing weapons", such as ] and later ], which projected warheads at a target ahead of the attacker and thus still in ASDIC contact. Developments during the war resulted in British ASDIC sets which used several different shapes of beam, continuously covering blind spots. Later, acoustic torpedoes were used. | |||
| At the start of ], British ASDIC technology was transferred for free to the United States. Research on ASDIC and underwater sound was expanded in the UK and in the US. Many new types of military sound detection were developed. These included ]s, first developed by the British in 1944, dipping/dunking sonar and ] sonar. This work formed the basis for post war developments related to countering the ]. Work on sonar had also been carried out in the Axis countries, notably in Germany, which included countermeasures. At the end of WWII this German work was assimilated by Britain and the US. Sonars have continued to be developed by many countries, including Russia, for both military and civil uses. In recent years the major military development has been the increasing interest in low frequency active systems. | |||
| ===SONAR=== | |||
| In World War II, the Americans used the term ''SONAR'' for their systems, coined as the equivalent of ]. RADAR was considered very glamorous and effective, and they wanted to cash in on the name. To be literal they should have named it SODAR (Sound Detection and Ranging) to be the equivalent of, standardization of signals led to the dropping of ''ASDIC'' in favor of ''SONAR'' for all NATO countries. | |||
| ==Performance factors== | |||
| The detection, classification and localisation performance of a sonar depends on the environment and the receiving equipment, as well as the transmitting equipment in an active sonar or the target radiated noise in a passive sonar. | |||
| ===Sound propagation=== | |||
| Sonar operation is affected by variations in ], particularly in the vertical plane. Sound travels more slowly in ] than in ], though the difference in speeds between fresh and salt water is small. In all water sound speed is determined by its ] and ] ]. The bulk modulus is affected by temperature, dissolved impurities (usually ]), and ]. The density effect is small. The ] (in feet per second) is approximately equal to: | |||
| :4388 + (11.25 × temperature (in °F)) + (0.0182 × depth (in feet)) + salinity (in parts-per-thousand ). | |||
| This is an ]ly derived approximation equation that is reasonably accurate for normal temperatures, concentrations of salinity and the range of most ocean depths. Ocean temperature varies with depth, but at between 30 and 100 meters there is often a marked change, called the ], dividing the warmer surface water from the cold, still waters that make up the rest of the ocean. This can frustrate sonar, for a sound originating on one side of the thermocline tends to be bent, or ], through the thermocline. The thermocline may be present in shallower coastal waters. However, wave action will often mix the water column and eliminate the thermocline. Water ] also affects sound propagation. Increased pressure increases the sound speed, which causes the sound waves to refract away from the area of higher sound speed. The mathematical model of refraction is called ]. | |||
| Sound waves that are radiated down into the deep ocean bend back up to the surface in great arcs due to the increasing pressure (and hence sound speed) with depth. The ocean must be at least 6000 feet (1850 m) deep, or the sound waves will echo off the bottom instead of refracting back upwards, and the reflection loss at the bottom reduces performance. Under the right conditions these sound waves will then be focused near the surface and refracted back down and repeat another arc. Each focus at the surface is called a convergence zone (CZ). This CZ forms an ] about the sonar. The distance and width of the CZ depends on the temperature and salinity of the water. In the North Atlantic, for example, CZs are found approximately every 33 ]s (61 km), depending on the season. Sounds that can be heard from only a few miles in a direct line can therefore also be detected hundreds of miles away. With powerful sonars the first, second and third CZ are fairly useful; further out than that the signal is too weak, and thermal conditions are too unstable, reducing the reliability of the signals. The signal is naturally attenuated by distance, but modern sonar systems are very sensitive, i.e. can detect despite a low ]. | |||
| If the sound source is deep and the conditions are right, propagation may occur in the ']'. This provides extremely low propagation loss to a receiver in the channel. This is because of sound trapping in the channel with no losses at the boundaries. Similar propagation can occur in the 'surface duct' under suitable conditions. However in this case there are reflection losses at the surface. | |||
| In shallow water propagation is generally by repeated reflection at the surface and bottom, where considerable losses can occur. | |||
| Sound propagation is also affected by ] in the water itself as well as at the surface and bottom. This absorption is frequency dependent, with several different mechanisms in sea water. Thus sonars required to operate over long ranges tend to utilise low frequencies to minimise absorption effects. | |||
| The sea contains many sources of noise that interfere with the desired target echo or signature. The main noise sources are due to ] and ]. The motion of the receiver through the water can also cause low frequency noise, which is speed dependent. | |||
| ===Reverberation=== | |||
| When active sonar is used, scattering occurs from small objects in the sea as well as from the bottom and surface. This can be a major source of interference but does not occur with passive sonar. This scattering effect is different from that in room reverberation which is a reflection phenomenon. An analogy for reverberation is the scattering of a car's headlights in fog or mist. A high-intensity pencil beam will penetrate the fog; main headlights are less directional and result in "white-out" where the returned reverberation dominates. Similarly, to overcome reverberation, an active sonar needs to transmit in a narrow beam. | |||
| ===Target characteristics=== | |||
| The target of a sonar, such as a submarine, has two main characteristics that influence the performance of the sonar. For active sonar it is its sound reflection characteristics, known as its target strength. For passive sonar the target's radiated noise characteristics are critical. The radiated spectrum in general will consist of an unresolved continuum of noise with spectral lines in it, the lines being used for classification. | |||
| Echoes are also obtained from other objects in the sea such as whales, wakes, schools of fish and rocks. | |||
| ===Countermeasures=== | |||
| Active (powered) countermeasures may be launched by a submarine under attack to raise the noise level and/or provide a large false target. Passive (i.e., non-powered) countermeasures include mounting noise generating devices on isolating devices and coating the hull of submarines. | |||
| ==Active sonar== | |||
| {{Unreferencedsection|date=January 2009}} | |||
| ] | |||
| Active sonar uses a sound transmitter and a receiver. When the two are in the same place it is monostatic operation. When the transmitter and receiver are separated it is bistatic operation. When more transmitters (or more receivers) are used, again spatially separated, it is multistatic operation. Most sonars are used monostatically with the same array often being used for transmission and reception. Active sonobuoy fields may be operated multistatically. | |||
| Active sonar creates a ] of sound, often called a "ping", and then listens for ]s (]) of the pulse. This pulse of sound is generally created electronically using a ] consisting of a signal generator, power amplifier and electro-acoustic transducer/array, possibly with a beamformer. However, it may be created by other means, e.g. (1) chemically using explosives, or (2) airguns or (3) plasma sound sources. | |||
| To measure the distance to an object, the time from transmission of a pulse to reception is measured and converted into a range by knowing the speed of sound. To measure the ], several ]s are used, and the set measures the relative arrival time to each, or with an array of hydrophones, by measuring the relative amplitude in beams formed through a process called ]. Use of an array reduces the spatial response so that to provide wide cover ] systems are used. The target signal (if present) together with noise is then passed through various forms of ], which for simple sonars may be just energy measurement. It is then presented to some form of decision device that calls the output either the required signal or noise. This decision device may be an operator with headphones or a display, or in more sophisticated sonars this function may be carried out by software. Further processes may be carried out to classify the target and localise it, as well as measuring its velocity. | |||
| The pulse may be at constant ] or a ] of changing frequency (to allow ] on reception). Simple sonars generally use the former with a filter wide enough to cover possible Doppler changes due to target movement, while more complex ones generally include the latter technique. Today, pulse compression is usually achieved using digital correlation techniques. Military sonars often have multiple beams to provide all-round cover while simple ones only cover a narrow arc. Originally the latter was often scanned around mechanically but this was a slow process. | |||
| Particularly when single frequency transmissions are used, the ] effect may be used to measure the radial speed of a target. The difference in frequency between the transmitted and received signal is measured and converted into a velocity. Since ] shifts can be introduced by either receiver or target motion, allowance has to be made for the radial speed of the searching platform. | |||
| One useful small sonar looks roughly like a waterproof flashlight. One points the head into the water, presses a button, and reads a distance. Another variant is a "]" that shows a small display with ]s of fish. Some civilian sonars approach active military sonars in capability, with quite exotic three-dimensional displays of the area near the boat. However, these sonars are not designed for stealth. | |||
| When active sonar is used to measure the distance from the transducer to the bottom, it is known as ]. Similar methods may be used looking upward for wave measurement. | |||
| Active sonar is also used to measure distance through water between two sonar transducers or a combination of a hydrophone (underwater acoustic microphone) and projector (underwater acoustic speaker). A transducer is a device that can transmit and receive acoustic signals ("pings"). When a hydrophone/transducer receives a specific interrogation signal it responds by transmitting a specific reply signal. To measure distance, one transducer/projector transmits an interrogation signal and measures the time between this transmission and the receipt of the other transducer/hydrophone reply. The time difference, scaled by the speed of sound through water and divided by two, is the distance between the two platforms. This technique, when used with multiple transducers/hydrophones/projectors, can calculate the relative positions of static and moving objects in water. | |||
| In wartime, emission of an active pulse is so compromising for a submarine's stealth that it is considered a very severe breach of tactics. | |||
| A very directional, yet low-efficiency type of sonar (used by fisheries, military, and for port security) makes use of a complex nonlinear feature of the water known as non-linear sonar, the virtual transducer being known as a '']''. | |||
| ===Transponder=== | |||
| This is an active sonar device that receives a stimulus and immediately (or with a delay) retransmits the received signal or a predetermined one. | |||
| ===Performance prediction=== | |||
| A sonar target is small relative to the ], centred around the emitter, on which it is located. Therefore, the power of the reflected signal is very low, several ] less than the original signal. Even if the reflected signal was of the same power, the following example (using hypothetical values) shows the problem: Suppose a sonar system is capable of emitting a 10,000 W/m² signal at 1 m, and detecting a 0.001 W/m² signal. At 100 m the signal will be 1 W/m² (due to the ]). If the entire signal is reflected from a 10 m² target, it will be at 0.001 W/m² when it reaches the emitter, i.e. just detectable. However, the original signal will remain above 0.001 W/m² until 300 m. Any 10 m² target between 100 and 300 m using a similar or better system would be able to detect the pulse but would not be detected by the emitter. The detectors must be very sensitive to pick up the echoes. Since the original signal is much more powerful, it can be detected many times further than twice the range of the sonar (as in the example). | |||
| In active sonar there are two performance limitations, due to noise and reverberation. In general one or other of these will dominate so that the two effects can be initially considered separately. | |||
| In noise limited conditions at initial detection:- | |||
| ::::<big>SL - 2TL + TS - (NL -DI) = DT</big> | |||
| where SL is the ], TL is the ] (or ]), TS is the ], NL is the ], DI is the ] of the array (an approximation to the ]) and DT is the ]. | |||
| In reverberation limited conditions at initial detection (neglecting array gain):- | |||
| ::::<big>SL - 2TL + TS = RL + DT</big> | |||
| where RL is the ] and the other factors are as before. | |||
| ===Marine Mammals === | |||
| ] | |||
| ===Hand-held sonar for use by a diver=== | |||
| ] using INSS hand-held sonar]] | |||
| *The LIMIS (= Limpet Mine Imaging Sonar) is a hand-held or ]-mounted imaging sonar for use by a diver. Its name is because it was designed for patrol divers (combat ] or ]s) to look for ]s in low ] water. Links: | |||
| ** Abstract of article by the ] <ref> Proc. ] Vol. 3711, p. 2-10, ''Information Systems for Navy Divers and Autonomous Underwater Vehicles Operating in Very Shallow Water and Surf Zone Regions'', Jody L. Wood; Ed. http://www.spie.org/</ref> | |||
| ** Used to find debris from the ] crash | |||
| ** Used in ] research at ] facilities | |||
| *The LUIS (= Lensing Underwater Imaging System) is another imaging sonar for use by a diver. Links: | |||
| ** Use counting salmon in a river | |||
| *There is or was a small flashlight-shaped handheld sonar for divers, that merely displays range. | |||
| *For the INSS = Integrated Navigation Sonar System see:- | |||
| ** . | |||
| ** | |||
| ** | |||
| ==Passive sonar== | |||
| Passive sonar listens without transmitting. It is often employed in military settings, although it is also used in science applications, e.g. detecting fish for presence/absence studies in various aquatic environments - see also ] and ]. In the very broadest usage, this term can encompass virtually any analytical technique involving remotely generated sound, though it is usually restricted to techniques applied in an aquatic environment. | |||
| ===Identifying sound sources=== | |||
| Passive sonar has a wide variety of techniques for identifying the source of a detected sound. For example, U.S. vessels usually operate 60 ] ] power systems. If ]s or ] are mounted without proper ] insulation from the ] or become flooded, the 60 Hz sound from the windings can be emitted from the ] or ship. This can help to identify its nationality, as most European submarines have 50 Hz power systems. Intermittent sound sources (such as a ] being dropped) may also be detectable to passive sonar. Until fairly recently, the identification of a signal was carried out by an operator using experience and training. Now computers may be utilised in this process. | |||
| Passive sonar systems may have large sonic ], however final classification is generally performed manually by the sonar operator. A ] frequently uses these databases to identify classes of ships, actions (i.e., the speed of a ship, or the type of weapon released), and even particular ships. Publications for classification of sounds are provided by and continually updated by the ]. | |||
| ===Noise limitations=== | |||
| Passive sonar on vehicles is usually severely limited because of noise generated by the vehicle. For this reason, many submarines operate ]s that can be cooled without pumps, using silent ], or ]s or ], which can also run silently. Vehicles' ]s are also designed and precisely machined to emit minimal noise. High-speed propellers often create tiny bubbles in the water, and this ] has a distinct sound. | |||
| The sonar ]s may be towed behind the ship or submarine in order to reduce the effect of noise generated by the watercraft itself. Towed units also combat the ], as the unit may be towed above or below the ]. | |||
| The display of most passive sonars used to be a two-dimensional ]. The horizontal direction of the display is bearing. The vertical is frequency, or sometimes time. Another display technique is to color-code frequency-time information for bearing. More recent displays are generated by the computers, and mimic ]-type ] displays. | |||
| ===Performance prediction=== | |||
| Unlike active sonar, only one way propagation is involved. Because of the different signal processing used, the minimum detectable signal to noise ratio will be different. The equation for determining the performance of a passive sonar is: | |||
| :::<big>SL - TL = NL - DI + DT</big> | |||
| where SL is the source level, TL is the transmission loss, NL is the noise level, DI is the directivity index of the array (an approximation to the array gain) and DT is the detection threshold. The ] of a passive sonar is: | |||
| :::<big>FOM = SL + DI - (NL + DT)</big>. | |||
| ==Warfare== | |||
| Modern ] makes extensive use of sonar. The two types described before are both used, from various platforms, i.e. water-borne vessels, aircraft and fixed installations. The usefulness of active versus passive sonar depends on the radiated noise characteristics of the target, generally a submarine. Although in WWII active sonar was mainly used, except by submarines, with the advent of modern signal processing passive sonar was preferred for initial detection. As the submarines have become quieter, active operation is now more used. In 1987 a division of Toshiba sold the machinery to Russia that allowed them to mill the submarine propeller blades so that they became radically quieter, creating a huge security issue with their newer generation of submarines. | |||
| Active sonar is extremely useful, since it gives the exact bearing to a target (and sometimes the range). Active sonar works the same way as ]: a signal is emitted. The sound wave then travels in many directions from the emitting object. When it hits an object, the sound wave is then reflected in many other directions. Some of the energy will travel back to the emitting source. The echo will enable the sonar system or technician to calculate, with many factors such as the frequency, the energy of the received signal, the depth, the water temperature, etc., the position of the reflecting object. Active sonar is used when the platform commander determines that it is more important to determine the position of a possible threat submarine than it is to reveal his own position. With surface ships it might be assumed that the threat is already tracking the ship with satellite date. Any vessel around the emitting sonar will detect the emission. Having heard the signal, it is easy to identify the type of sonar (usually with its frequency) and its position (with the sound wave's energy). Moreover, active sonar, similar to radar, allows the user to detect objects at a certain range but also enables other platforms to detect the active sonar at a far greater range. | |||
| Since active sonar does not allow exact classification and is very noisy, this type of detection is used by fast platforms (planes, helicopters) and by noisy platforms (most surface ships) but very rarely by submarines. Ballistic missile submarines do not even have active sonar, since they never want to risk detection. When active sonar is used by surface ships or submarines, it is typically activated very briefly at intermittent periods, to reduce the risk of detection by an enemy's passive sonar. As such, active sonar is normally considered a backup to passive sonar. In aircraft, active sonar is used in the form of disposable ]s that are dropped in the aircraft's patrol area or in the vicinity of possible enemy sonar contacts. | |||
| Passive sonar has several advantages. Most importantly, it is silent. If the target ] is high enough, it can have a greater range than active sonar, and allows an identification of the target. Since any motorized object makes some noise, it may be detected eventually. It simply depends on the amount of noise emitted and the amount of noise in the area, as well as the technology used. To simplify, passive sonar "sees" around the ship using it. On a submarine, the nose mounted passive sonar detects in directions of about 270°, centered on the ship's alignment, the hull-mounted array of about 160° on each side, and the towed array of a full 360°. The no-see areas are due to the ship's own interference. Once a signal is detected in a certain direction (which means that something makes sound in that direction, this is called broadband detection) it is possible to zoom in and analyze the signal received (narrowband analysis). This is generally done using a ] to show the different frequencies making up the sound. Since every engine makes a specific noise, it is straightforward to identify the object. The classified databases of unique noises are part of what is known as ''acoustic intelligence'' or ACINT. | |||
| Another use of the passive sonar is to determine the target's ]. This process is called Target Motion Analysis (TMA), and the resultant "solution" is the target's range, course, and speed. TMA is done by marking from which direction the sound comes at different times, and comparing the motion with that of the operator's own ship. Changes in relative motion are analyzed using standard geometrical techniques along with some assumptions about limiting cases. | |||
| Passive sonar is stealthy and very useful. However, it requires high-tech components (]s, receivers) and is costly. It is generally deployed on expensive ships in the form of arrays to enhance the detection. Surface ships use it to good effect; it is even better used by ], and it is also used by airplanes and helicopters, mostly to a "surprise effect", since submarines can hide under thermal layers. If a submarine captain believes he is alone, he may bring his boat closer to the surface and be easier to detect, or go deeper and faster, and thus make more sound. | |||
| Examples of sonar applications in military use are given below. Many of the civil uses given in the following section may also be applicable to naval use. | |||
| ===Anti-submarine warfare=== | |||
| ] | |||
| Until recently, ship sonars were usually with hull mounted arrays, either amidships or at the bow. It was soon found after their initial use that a means of reducing flow noise was required. The first were made of canvas on a framework, then steel ones were used. Now domes are usually made of reinforced plastic or pressurised rubber. Such sonars are primarily active in operation. An example of a conventional hull mounted sonar is the ]. | |||
| Because of the problems of ship noise, towed sonars are also used. These also have the advantage of being able to be placed deeper in the water. However, there are limitations on their use in shallow water. These are called towed arrays (linear) or variable depth sonars (VDS) with 2/3D arrays. A problem is that the winches required to deploy/recover these are large and expensive. VDS sets are primarily active in operation while towed arrays are passive. | |||
| An example of a modern active/passive ship towed sonar is ] made by ]. | |||
| ===Torpedoes=== | |||
| Modern torpedoes are generally fitted with an active/passive sonar. This may be used to home directly on the target, but wake following torpedoes are also used. An early example of an acoustic homer was the ]. | |||
| Torpedo countermeasures can be towed or free. An early example was the German Sieglinde device while the ] was a chemical device. A widely used US device was the towed ] while ] submarine simulator was a free device. A modern alternative to the ] system is the ] system. | |||
| ===Mines=== | |||
| Mines may be fitted with a sonar to detect, localise and recognise the required target. Further information is given in ] and an example is the ]. | |||
| ===Mine countermeasures=== | |||
| Mine Countermeasure (MCM) Sonar, sometimes called "Mine and Obstacle Avoidance Sonar (MOAS)", is a specialised type of sonar used for detecting small objects. Most MCM sonars are hull mounted but a few types are VDS design. An example of a hull mounted MCM sonar is the ] while the ] and ] systems are VDS designs. | |||
| ===Submarines=== | |||
| Submarines rely on sonar to a greater extent than surface ships as they cannot use radar at depth. The sonar arrays may be hull mounted or towed. Information fitted on typical fits is given in ] and ] submarine. | |||
| ===Aircraft=== | |||
| Helicopters can be used for antisubmarine warfare by deploying fields of active/passive ]s or can operate dipping sonar, such as the AQS-13. Fixed wing aircraft can also deploy sonobuoys and have greater endurance and capacity to deploy them. Processing from the sonobuoys or dipping sonar can be on the aircraft or on ship. Helicopters have also been used for mine countermeasure missions using towed sonars such as the ] | |||
| ].]] | |||
| ===Underwater communications=== | |||
| Dedicated sonars can be fitted to ships and submarines for underwater communication. See also the section on the ] page. | |||
| ===Ocean surveillance=== | |||
| For many years, the ] operated a large set of passive sonar arrays at various points in the world's oceans, collectively called ] and later Integrated Undersea Surveillance System (IUSS). A similar system is believed to have been operated by the Soviet Union. As permanently mounted arrays in the deep ocean were utilised, they were in very quiet conditions so long ranges could be achieved. Signal processing was carried out using powerful computers ashore. With the ending of the Cold War a SOSUS array has been turned over to scientific use. | |||
| In the United States Navy, a special badge known as the ] is awarded to those who have been trained and qualified in its operation. | |||
| ===Underwater security=== | |||
| Sonar can be used to detect ] and other ]s. This can be applicable around ships or at entrances to ports. Active sonar can also be used as a deterrent and/or disablement mechanism. One such device is the ] system. | |||
| See ] and ]. | |||
| ===Hand-held sonar=== | |||
| Limpet Mine Imaging Sonar (LIMIS) is a hand-held or ]-mounted imaging sonar designed for patrol divers (combat ] or ]s) to look for ]s in low ] water. | |||
| The LUIS is another imaging sonar for use by a diver. | |||
| Integrated Navigation Sonar System (INSS) is a small flashlight-shaped handheld sonar for divers that displays range.<ref>{{cite journal |url=http://archive.rubicon-foundation.org/7497 |title=Very High Resolution Imaging Diver Held Sonar |journal=Report to the Office of Naval Research |year=2002 |author=Lent, K |accessdate=2008-08-11 }}</ref><ref>{{cite web |url=http://stinet.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA415201 |title=Diver Charting and Graphical Display| publisher=TEXAS UNIV AT AUSTIN APPLIED RESEARCH LABS |author=Krueger, Kenneth L.|date=]|accessdate=2006-06-23}}</ref> | |||
| ===Intercept sonar=== | |||
| This is a sonar designed to detect and locate the transmissions from hostile active sonars. An example of this is the Type 2082 fitted on the ]s. | |||
| ==Civil applications== | |||
| ===Fisheries=== | |||
| ] is an important industry that is seeing growing demand, but world catch tonnage is falling as a result of serious resource problems. The industry faces a future of continuing worldwide consolidation until a point of ] can be reached. However, the consolidation of the fishing fleets are driving increased demands for sophisticated fish finding electronics such as sensors, sounders and sonars. Historically, fishermen have used many different techniques to find and harvest fish. However, acoustic technology has been one of the most important driving forces behind the development of the modern commercial fisheries. | |||
| Sound waves travel differently through fish than through water because a fish's air-filled ] has a different density than seawater. This density difference allows the detection of schools of fish by using reflected sound. Acoustic technology is especially well suited for underwater applications since sound travels farther and faster underwater than in air. Today, commercial fishing vessels rely almost completely on acoustic sonar and sounders to detect fish. Fishermen also use active sonar and echo sounder technology to determine water depth, bottom contour, and bottom composition. | |||
| ] | |||
| Companies such as Raymarine UK, Marport Canada, Wesmar, Furuno, Krupp, and Simrad make a variety of sonar and acoustic instruments for the ] commercial fishing industry. For example, net sensors take various underwater measurements and transmit the information back to a receiver onboard a vessel. Each sensor is equipped with one or more acoustic transducers depending on its specific function. Data is transmitted from the sensors using wireless acoustic telemetry and is received by a hull mounted hydrophone. The ]s are decoded and converted by a digital acoustic receiver into data which is transmitted to a bridge computer for ] on a high resolution monitor. | |||
| ===Echo sounding=== | |||
| An echo-sounder sends an acoustic pulse directly downwards to the seabed and records the returned echo. The sound pulse is generated by a transducer that emits an acoustic pulse and then “listens” for the return signal. The time for the signal to return is recorded and converted to a depth measurement by calculating the speed of sound in water. As the speed of sound in water is around 1,500 metres per second, the time interval, measured in milliseconds, between the pulse being transmitted and the echo being received, allows bottom depth and targets to be measured. | |||
| The value of underwater acoustics to the fishing industry has led to the development of other acoustic instruments that operate in a similar fashion to echo-sounders but, because their function is slightly different from the initial model of the echo-sounder, have been given different terms. | |||
| ===Net location=== | |||
| The net sounder is an echo sounder with a transducer mounted on the headline of the net rather than on the bottom of the vessel. Nevertheless, to accommodate the distance from the transducer to the display unit, which is much greater than in a normal echo-sounder, several refinements have to be made. Two main types are available. The first is the cable type in which the signals are sent along a cable. In this case there has to be the provision of a cable drum on which to haul, shoot and stow the cable during the different phases of the operation. The second type is the cable less net-sounder – such as Marport’s Trawl Explorer - in which the signals are sent acoustically between the net and hull mounted receiver/hydrophone on the vessel. In this case no cable drum is required but sophisticated electronics are needed at the transducer and receiver. | |||
| The display on a net sounder shows the distance of the net from the bottom (or the surface), rather than the depth of water as with the echo-sounder's hull-mounted ]. Fixed to the headline of the net, the footrope can usually be seen which gives an indication of the net performance. Any fish passing into the net can also be seen, allowing fine adjustments to be made to catch the most fish possible. In other fisheries, where the amount of fish in the net is important, catch sensor transducers are mounted at various positions on the cod-end of the net. As the cod-end fills up these catch sensor transducers are triggered one by one and this information is transmitted acoustically to display monitors on the bridge of the vessel. The skipper can then decide when to haul the net. | |||
| Modern versions of the net sounder, using multiple element transducers, function more like a sonar than an echo sounder and show slices of the area in front of the net and not merely the vertical view that the initial net sounders used. | |||
| The sonar is an echo-sounder with a directional capability that can show fish or other objects around the vessel. | |||
| ===Ship velocity measurement=== | |||
| Sonars have been developed for measuring a ship's velocity either relative to the water or to the bottom. | |||
| ===ROV and UUV=== | |||
| Small sonars have been fitted to Remotely Operated Vehicles (ROV) and Unmanned Underwater Vehicles (UUV) to allow their operation in murky conditions. These sonars are used for looking ahead of the vehicle. The ] is an UUV for MCM purposes. | |||
| ===Vehicle location=== | |||
| Sonars which act as beacons are fitted to aircraft to allow their location in the event of a crash in the sea. Short and Long Baseline sonars may be used for caring out the location, such as ]. | |||
| ==Scientific applications== | |||
| ===Biomass estimation=== | |||
| {{main|Bioacoustics}} | |||
| Detection of fish, and other marine and aquatic life, and estimation their individual sizes or total biomass using active sonar techniques. As the sound pulse travels through water it encounters objects that are of different density or acoustic characteristics than the surrounding medium, such as fish, that reflect sound back toward the sound source. These echoes provide information on fish size, location, abundance and behavior. | |||
| See Also: ] | |||
| ===Wave measurement=== | |||
| An upward looking echo sounder mounted on the bottom or on a platform may be used to make measurements of wave height and period. From this statistics of the surface conditions at a location can be derived. | |||
| ===Water velocity measurement=== | |||
| Special short range sonars have been developed to allow measurements of water velocity. | |||
| ===Bottom type assessment=== | |||
| Sonars have been developed that can be used to characterise the sea bottom into, for example, mud, sand, and gravel. Relatively simple sonars such as echo sounders can be promoted to seafloor classification systems via add-on modules, converting echo parameters into sediment type. Different algorithms exist, but they are all based on changes in the energy or shape of the reflected sounder pings. Advanced substrate classification analysis can be achieved using calibrated (scientific) echosounders and parametric or fuzzy-logic analysis of the acoustic data (See: ]) | |||
| ===Bottom topography measurement=== | |||
| ]s can be used to derive maps of the topography of an area by moving the sonar across it just above the bottom. Low frequency sonars such as ] have been used for continental shelf wide surveys while high frequency sonars are used for more detailed surveys of smaller areas. | |||
| ===Sub-bottom profiling=== | |||
| Powerful low frequency echo-sounders have been developed for providing profiles of the upper layers of the ocean bottom. | |||
| ===Synthetic aperture sonar=== | |||
| Various synthetic aperture sonars have been built in the laboratory and some have entered use in mine-hunting and search systems. An explanation of their operation is given in ]. | |||
| ===Parametric sonar=== | |||
| Parametric sources use the non-linearity of water to generate the difference frequency between two high frequencies. A virtual end-fire array is formed. Such a projector has advantages of broad bandwidth, narrow beamwidth, and when fully developed and carefully measured it has no obvious sidelobes: see ]. Its major disadvantage is very low efficiency of only a few percent.<ref> H O Berktay, Some Finite Amplitude Effects in Underwater Acoustics in V M Albers "Underwater Acoustics" 1967 </ref>. P.J. Westervelt's seminal 1963 JASA paper summarizes the trends involved. | |||
| ==See also== | |||
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| == Notes == | |||
| {{reflist|2}} | |||
| ==References== | |||
| <div class="references-small"> | |||
| * "R. J. Urick, Principles of Underwater Sound, 3rd edition (Peninsula Publishing, Los Altos, 1983)" | |||
| '''Fisheries Acoustics References''' | |||
| * Fisheries Acoustics Research (FAR) at University of Washington http://www.acoustics.washington.edu/ | |||
| * NOAA Protocols for Fisheries Acoustics Surveys http://www.st.nmfs.gov/st4/protocol/Acoustic_protocols.pdf | |||
| * Fisheries Acoustics (2nd Edition) http://store.blackwell-professional.com/063205994x.html | |||
| * "ACOUSTICS IN FISHERIES AND AQUATIC ECOLOGY" http://www.ifremer.fr/sympafae/ | |||
| * "Hydroacoustic Protocol - Lakes, Reserviors and Lowland Rivers" (for fish assessment) http://www.pnamp.org//web/workgroups/FPM/meetings/2005_1205/2005_1202Hydroacoustics-Lakes.doc | |||
| </div> | |||
| ==Bibliography== | |||
| * Hackmann, Willem D. ''Seek & Strike: Sonar, Anti-submarine Warfare, and the Royal Navy, 1914-54.'' (London: HMSO, 1984) | |||
| * Hackmann, Willem D. "Sonar Research and Naval Warfare 1914-1954: A Case Study of a Twentieth-Century Science.” ''Historical Studies in the Physical and Biological Sciences’’ 16#1 (1986) 83-110 | |||
| == External links == | |||
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