SACLANT ASW Research Centre
Encyclopedia
The SACLANT ASW Research Centre was the predecessor to the NATO Undersea Research Centre
. It was known as The SACLANT ASW Research Centre from 1959 through 1986 and the SACLANT Undersea Research Centre from 1987 through 2003. The Centre was commonly referred to as SACLANTCEN.
, was launched into orbit by the USSR. The U.S. started its own submarine-launched ballistic missile
(SLBM) programme under then Chief of Naval Operations, Admiral Arleigh Burke
, with the mission to launch a 1500 nautical miles (2,778 km) Polaris missile from a submarine. The initial goal was to have this operational by 1965, but Soviet activities resulted in an accelerated schedule to deliver the first submarine by December 1959 and the second vessel by March 1960.
To restrict movement of the USSR submarine fleet and to guarantee safe movement of their own, the United States and NATO understood the need for better scientific knowledge of the undersea environment. Many nations had active research laboratories in this field, but there was need to improve synergies among the nations to ensure the ability of NATO to counter threats in the underwater domain. Members of the U.S. Naval Research Advisory Committee
paid a visit to numerous nations—Canada, Denmark, France, Germany, Italy, the Netherlands, Norway, and the United Kingdom—and reached an agreement to work together by pooling scientific information and expertise in anti-submarine warfare (ASW) research. Italy offered to provide a facility within its naval base in La Spezia. Climatic considerations, which allowed experiments to be carried out for most of the year, and the location, which provided easy access both to deep and shallow waters, favoured this solution.
The Supreme Allied Commander Atlantic (SACLANT)
, Admiral Jerauld Wright
, USN, was the NATO commander responsible for ASW, and in June 1958, he endorsed the creation of a NATO international scientific organisation devoted to undersea research under the umbrella of the Virginia-based SACLANT command structure. Pending final approval of financial support from NATO members, the U.S. Secretary of Defence agreed to provide the necessary funding for the immediate establishment of this organisation. On 2 May 1959 the “SACLANT ASW Research Centre” or SACLANTCEN was officially commissioned. The flags of the nine NATO nations that provided personnel to the Centre were raised for the first time with that of the Atlantic Alliance in the Italian naval compound east of La Spezia. During its first 4 years, the Centre was managed by an Italian non-profit company, Società Internazionale Ricerche Marine or SIRIMAR, initially a subsidiary of Raytheon
, but later owned and managed by Pennsylvania State University
. In mid-1962, discussions in Paris resulted in a charter that was officially adopted by the North Atlantic Council on 20 October. This charter recognised the Centre as a NATO organization under the direction of the Supreme Allied Commander Atlantic (SACLANT). The Scientific Advisory Council, which provided advice to SACLANT in the early years, evolved into the Scientific Committee of National Representatives (SCNR), which to this day provides advice related to the Centre’s programme of work.
to SACLANT. It could also be called upon to assist NATO nations in this domain. To carry out its mission the Centre chartered an old freighter, the Aragonese, which was quickly transformed into a research vessel, giving the organisation a sea-going capability. In 1964 the 2,800 tonne Maria Paolina G. was chartered, replacing the aging Aragonese.
In the early years the scientific programme was mostly centred on underwater acoustics
, oceanography
, systems concepts evaluation, and antisubmarine warfare. Understanding the complexities of how sound propagates underwater was, and continues to be, the basis for detecting and classifying submarines. Until the mid-1970s, the Centre’s research focus was mainly on deep waters, where Soviet nuclear submarines prowled for possible attack on the continental U.S. or to disrupt lines of communications between North America and Europe. In particular the Mediterranean Sea
and the Strait of Gibraltar
, which connected the two main operational areas, were of major interest. Studies in these two areas, carried out in the mid-1960s, resulted in significant developments in oceanographic buoy
technology. Two longer cruises were carried out in the Greenland-Iceland-U.K. Gap, normally known as the GIUK Gap
, the only available outlet into the ocean for Soviet submarines operating from the Northern Fleet bases on the Kola Peninsula.
for oceanographic work, joined the SACLANTCEN fleet on loan from the U.S. Government.
In 1975, the scientific side of SACLANTCEN was reorganised into two main divisions: the Environmental and Systems Research Division and the Operational and Analytical Research Division. After more than a decade mostly dedicated to deep waters, shallow waters became a new priority as submarine activity in those areas was increasing and submarines were becoming quieter and available to more nations. To address shallow water problems, new factors had to be taken into consideration such as the type of ocean floor, sound reflection, reverberation, and clutter.
This led to further research on oceanography and acoustics with experiments carried out mostly along the Ligurian coast, while in the meantime new instruments were studied and developed for collecting data in shallower waters, although the improvement of data collection in deep waters continued. In the late 1970s, towed arrays made their presence in La Spezia. The Centre started testing the first experimental hydrophone linear array built by Hughes Aircraft
Corporation, on loan from the U.S. Office of Naval Research
. Noise generated by the towing vessel proved to be the ultimate limiting factor. However the directionality (due to its length) and the possibility of positioning it at the optimal depth, as well as its passive and active capabilities, were the main advantages highlighted by tests. Based on studies carried out in 1976, two years later the Bistatic Active Towed Array (BITOW) sonar programme was launched. This system used a second vessel as auxiliary receiver, leading to a considerable increase of the detection range. The omnidirectional hydrophones used resulted in an inability to determine whether signals were coming from the right or left. SACLANTCEN resolved this problem by designing cardioid hydrophones which provided the left-right discrimination.
For towed arrays to be effective, the noise problem of the towing vessel needed to be solved. In 1984 the keel of a new research vessel specially designed for SACLANTCEN was laid at the Muggiano Fincantieri
shipyard, a few hundred meters away from the Centre. The design priority for this 3,180-tonne ship was the reduction of ship radiated noise. This goal was accomplished with a double hull and a specially designed propulsion system. The NATO Research Vessel (NRV) Alliance was launched in 1986 and commissioned in 1988, replacing the Maria Paolina G. Since then, it has retained its reputation as one of the quietest ships afloat, spending an average of 170 days a year at sea supporting the Centre’s experiments.
came down, marking the end of the Cold War. The Centre’s name change in 1987 to the SACLANT Undersea Research Centre clearly indicated the shift in focus from “Anti-Submarine Warfare” to “Underwater” research. The Iran-Iraq War
was a major event during that period; it led to the so-called “Tanker War”, where oil tankers moving through the Persian Gulf were threatened not only by Iranian air and small boat attacks, but also by some 150 sea mines of various types, mostly vintage, laid by Iran.
Mine countermeasures
During this period, the decrease in NATO's strategic interest in anti-submarine warfare (ASW) was matched by a corresponding increase in the significance of mine countermeasures (MCM), especially in the context of expeditionary operations. This was highlighted by operations in the Northern Persian Gulf in 1990-1991 when the projection of coalition power ashore was constrained by its maritime forces' ability to reduce, at an adequate rate, the risk posed by Iraqi mines. The new focus required higher sonar frequencies, the ability to identify mines masked by the environment, and an increase in the tempo of MCM operations. The Centre’s research activity was concentrated mainly on minehunting techniques, i.e. finding mines on the sea floor, which might be partly buried, discriminating mines from other harmless objects (clutter), and classifying them in order to take appropriate actions. High quality images were needed, which required high-frequency, high-resolution sonar imagery techniques. This in turn led to the development of automatic sonar interpretation systems, which reduced the amount of time needed to train personnel. The research focus shifted from manned minehunting to remote minehunting, with the ultimate objective of replacing a surface ship with robotic systems. This led the Centre to revive some studies on synthetic aperture sonar
(SAS), which had been shelved in the early 1970s as technologies were not yet mature at that time.
Anti-submarine warfare research
Submarine detection and classification remained on the research agenda, although the focus shifted gradually toward shallow waters. Low frequency active sonar (LFAS)
research started in the early 1980s with a project to verify the feasibility of towed sonar systems, analysing typical performance-linked parameters such as propagation loss, signal coherence, noise, reverberation and target strength. SACLANTCEN links to military organisations were vital in obtaining support of naval submarine services, and numerous experiments were carried out in the Mediterranean. The shift in focus from deep to shallow waters came with the advent of small diesel-electric submarines that can operate close to home base. Detection in shallow waters is difficult due mainly to signal interferences from reverberation and clutter. New research programmes at the Centre investigated how to reduce the number of false alarms caused by reverberation, directional interference and target-like clutter when LFAS was used closer to the coasts. Fixed feature removal methods were investigated, while studies on detection optimisation and information extraction were also carried out to automate and improve LFAS performances in shallow waters. Research was also conducted on static deployable sonar systems.
Marine mammal programme
In May 1996, SACLANTCEN carried out a shallow water acoustic classification experiment in Greece
, in the Gulf of Kyparissiakos, with the source level towed by the NRV Alliance. During that time about 14 Cuvier’s beaked whales
stranded along the coast. As a result of the incident, SACLANTCEN hosted a bioascoustic panel with independent scientists to investigate the cause of the stranding. At that time, no clear-cut conclusions were made, as it was impossible to establish or to exclude a direct link between the experiment and the stranding. A recommendation was issued for environmental assessment procedures to be implemented, and this led in 1999 to the Sound Ocean Living Marine Resources (SOLMAR) programme at the Centre. Since SACLANTCEN’s location, La Spezia, is close to the Ligurian Sea International Marine Sanctuary
whose northern boundaries are the coasts of Italy and France while its southern limit is Corsica, the first aim of the SOLMAR programme was to monitor and acquire information on marine mammals living in that area. This was carried out both visually and acoustically during a series of annual sea trials known as SIRENA.
Controlled exposed experiments have also been undertaken to verify any possible relationship between noise and marine mammal behaviour. Oceanographic measurements were also carried out to better understand the environment where the marine mammals live. Following other strandings in 2000 and 2002 in areas where NATO exercises were conducted, high priority was assigned to mitigate risks to marine mammals during NATO naval exercises. In 2002, the SOLMAR programme became the Marine Mammal Risk Mitigation (MMRM) project. Activities continued focusing on the optimisation of the risk mitigation package designed by SACLANTCEN, which includes passive acoustic monitors, a predictive habitat model, a sound propagation model, a website with planning and training aids, and a guiding policy for the use of active sonar in experiments. The package was updated following each cruise, which contributed to increased knowledge of marine mammal behaviour. A Human Diver and Marine Mammal Incident Action Team manned by personnel from the Centre was established and stood ready to deploy in case of stranding or diving incidents, although no strandings have been linked to SACLANTCEN operations since the SOLMAR/MMRM programme was established. One of the values of the project was that an increasing number of independent scientific and environmental organisations began to cooperate with the Centre in this research area.
Military oceanography (MILOC)
Although both theoretical studies and MILOC operations partly covered shallow waters, such as the Shallow Meadow campaign in the Baltic in 1983-1987, most of SACLANTCEN activities were initially dedicated to deep waters, oriented towards antisubmarine warfare and the protection of sea lines of communication. The output of those activities were new concepts for the improvement of sonar or the development of underwater detection systems. MILOC activities also resulted in oceanographic and acoustic databases that supported modelling, resulting in improved exploitation of operational sensors.
In a post-Cold War environment, crises tended to be regional, taking place in unknown coastal waters, with operations involving joint and combined forces. MCM and ASW activities related to those operations required different knowledge of the related environment, silent diesel-electric submarines and mines becoming the dominant threat. Higher resolution models were needed as well as geographical information systems (GIS) containing all possible information related to the area. The challenge was to provide information in a short time frame. The new name of this task became Rapid Environmental Assessment, or REA, which was identified by SACLANT as a new underwater operational requirement in 1995.
The Adriatic Sea
became the focus of attention in 1992 when NATO took part in a monitoring operation to verify sanctions imposed on Serbia and Montenegro by the United Nations. It was the start of the Balkan crisis
, which would involve NATO naval forces for several years. A shallow water environment with intense trawler fishing activities, such as the Adriatic, required robust new instrumentation for oceanographic surveys conducted to support naval operations. SACLANTCEN designed an Acoustic Doppler Current Profiler
(ADCP) with a low profile that is resistant to fishing trawlers. Named Barny, the ADCP sensors were at 0.5 m from the bottom providing optimal boundary layer coverage, and following tests of the prototype built at SACLANTCEN, it was mass produced by a commercial company under Centre supervision. The original model was equipped with a self-recoding device and had to be picked up for data retrieval after six months. An enhanced version better suited for small boat operations was developed together with the U.S. Naval Research Laboratory in 1996.
The need to measure ocean properties in the shortest possible time with expendable equipment led to the development of the Shallow-Water Expendable Environmental Profiler (SWEEP). SWEEP, which could operate in waters up to 100 meters deep, was moored to the bottom and at pre-programmed intervals would surface to transmit physical data collected on the bottom and while traveling to and from the surface. However, SWEEP was not usable in areas with trawler fishing activities. SACLANTCEN merged the features of Barny and SWEEP and developed the Shallow-water Environmental Profiler Trawl-safe Real-time (SEPTR), a buoy similar to Barny but with a profiler similar to the one used on SWEEP, which would surface at fixed intervals. Tested in 2000, SEPTR was available for use in the ASCOT01 sea trial and updated versions are still in operation today.
Operations research and analysis
Operational research has been a key activity at SACLANTCEN since its creation. Mostly dedicated to operational analysis and operational support, numerous software aids developed in the 1990s were provided to NATO nations through the Centre’s Scientific Committee of National Representatives (SCNR). Leveraging the knowledge acquired from different areas of activities, and showing how a multidisciplinary approach can produce useful tools for warfighters, SACLANTCEN was asked by several naval commands to provide them with antisubmarine warfare planning tools. The Centre was also involved in studies related to changes in naval forces after the end of the Cold War, as well as in exercise evaluation. In 1993 the Commander Allied Naval Forces Southern Europe requested support for planning ASW operations in the Mediterranean, in order to optimise the protection of shipping in the Mediterranean.
With the increase in mine-related activities, SACLANTCEN also took part in the development of MCM Exclusive Planning and Evaluation Tool (EXPERT), led by NATO Consultation, Command and Control Agency
(NC3A). MCM EXPERT helps commanders optimise mine search operations. Similarly the Electronic Minefield Referee (EMIR) tool developed by the operational analysis group was widely used in NATO and national exercises. Experts from the Centre often deployed onboard MCM vessels during exercises to compare predicted performances with actual minehunting results. They also provided advice on how to best use the knowledge on environmental conditions to clear more mines.
Most of the research activities required the support of ship assets managed by the SACLANTCEN Ship Management Office. At the turn of the century the T-Boat Manning had been in service for 45 years. The advantage of operations carried out with a silent ship were highlighted by the activity of NRV Alliance, which recorded about 170 days per year at sea, mostly dedicated to the Centre’s activities but also chartered to other organisations. In the late 1990s the Ship Management Office developed the mission profile and requirements for a new ship with a size comparable to that of the Manning but with characteristics similar to the NRV Alliance in terms of silent movement and scientific support capabilities. Once funds were obtained from NATO, a contract with McTay Marine Ltd. was signed in 2000 and the Coastal Research Vessel (CRV) Leonardo was delivered to NATO in the UK on 31 July 2002, a few months after the lease of the Manning had expired. CRV Leonardo was commissioned in La Spezia on 6 September 2002 as the first Italian public vessel.
, NATO’s military command structure was reorganized with a focus to become leaner and more efficient. Supreme Headquarters Allied Power Europe was to become the single strategic command focused on NATO field operations under the name Allied Command Operations (ACO) while Supreme Allied Commander Atlantic would be focused on transforming NATO operations, changing its name in Allied Command Transformation
(ACT). ACT was formally established on June 19, 2003, and the same day SACLANTCEN changed its name into the NATO Undersea Research Centre
(NURC).
NATO Undersea Research Centre
The NATO Undersea Research Centre , based in La Spezia, Italy, is a research organisation under NATO's Allied Command Transformation, which is headquartered in Norfolk, Virginia. NURC conducts research and develops products to support NATO maritime operations and to support the continuous...
. It was known as The SACLANT ASW Research Centre from 1959 through 1986 and the SACLANT Undersea Research Centre from 1987 through 2003. The Centre was commonly referred to as SACLANTCEN.
Establishment of the Centre
In the mid-1950s a series of events challenged the balance of power between the United States and the Soviet Union. In 1955 the Soviet Union, for the first time, launched a ballistic missile from a submarine. Two years later, on 4 October 1957, the world's first artificial satellite, Sputnik 1Sputnik 1
Sputnik 1 ) was the first artificial satellite to be put into Earth's orbit. It was launched into an elliptical low Earth orbit by the Soviet Union on 4 October 1957. The unanticipated announcement of Sputnik 1s success precipitated the Sputnik crisis in the United States and ignited the Space...
, was launched into orbit by the USSR. The U.S. started its own submarine-launched ballistic missile
Submarine-launched ballistic missile
A submarine-launched ballistic missile is a ballistic missile capable of delivering a nuclear warhead that can be launched from submarines. Modern variants usually deliver multiple independently targetable reentry vehicles each of which carries a warhead and allows a single launched missile to...
(SLBM) programme under then Chief of Naval Operations, Admiral Arleigh Burke
Arleigh Burke
Admiral Arleigh Albert '31-knot' Burke was an admiral of the United States Navy who distinguished himself during World War II and the Korean War, and who served as Chief of Naval Operations during the Eisenhower and Kennedy administrations.-Early life and naval career:Burke was born in Boulder,...
, with the mission to launch a 1500 nautical miles (2,778 km) Polaris missile from a submarine. The initial goal was to have this operational by 1965, but Soviet activities resulted in an accelerated schedule to deliver the first submarine by December 1959 and the second vessel by March 1960.
To restrict movement of the USSR submarine fleet and to guarantee safe movement of their own, the United States and NATO understood the need for better scientific knowledge of the undersea environment. Many nations had active research laboratories in this field, but there was need to improve synergies among the nations to ensure the ability of NATO to counter threats in the underwater domain. Members of the U.S. Naval Research Advisory Committee
Naval Research Advisory Committee
The Naval Research Advisory Committee is a civilian advisory committee to the United States Navy.The committee was established in 1946 by Public Law 588, which also created the Office of Naval Research...
paid a visit to numerous nations—Canada, Denmark, France, Germany, Italy, the Netherlands, Norway, and the United Kingdom—and reached an agreement to work together by pooling scientific information and expertise in anti-submarine warfare (ASW) research. Italy offered to provide a facility within its naval base in La Spezia. Climatic considerations, which allowed experiments to be carried out for most of the year, and the location, which provided easy access both to deep and shallow waters, favoured this solution.
The Supreme Allied Commander Atlantic (SACLANT)
Supreme Allied Commander Atlantic
The Supreme Allied Commander Atlantic was one of two supreme commanders of the North Atlantic Treaty Organisation , the other being the Supreme Allied Commander Europe . The SACLANT led Allied Command Atlantic, based at Norfolk, Virginia...
, Admiral Jerauld Wright
Jerauld Wright
Admiral Jerauld Wright, USN, served as the Commander-in-Chief of the U.S. Atlantic Command and the Commander-in-Chief of the U.S...
, USN, was the NATO commander responsible for ASW, and in June 1958, he endorsed the creation of a NATO international scientific organisation devoted to undersea research under the umbrella of the Virginia-based SACLANT command structure. Pending final approval of financial support from NATO members, the U.S. Secretary of Defence agreed to provide the necessary funding for the immediate establishment of this organisation. On 2 May 1959 the “SACLANT ASW Research Centre” or SACLANTCEN was officially commissioned. The flags of the nine NATO nations that provided personnel to the Centre were raised for the first time with that of the Atlantic Alliance in the Italian naval compound east of La Spezia. During its first 4 years, the Centre was managed by an Italian non-profit company, Società Internazionale Ricerche Marine or SIRIMAR, initially a subsidiary of Raytheon
Raytheon
Raytheon Company is a major American defense contractor and industrial corporation with core manufacturing concentrations in weapons and military and commercial electronics. It was previously involved in corporate and special-mission aircraft until early 2007...
, but later owned and managed by Pennsylvania State University
Pennsylvania State University
The Pennsylvania State University, commonly referred to as Penn State or PSU, is a public research university with campuses and facilities throughout the state of Pennsylvania, United States. Founded in 1855, the university has a threefold mission of teaching, research, and public service...
. In mid-1962, discussions in Paris resulted in a charter that was officially adopted by the North Atlantic Council on 20 October. This charter recognised the Centre as a NATO organization under the direction of the Supreme Allied Commander Atlantic (SACLANT). The Scientific Advisory Council, which provided advice to SACLANT in the early years, evolved into the Scientific Committee of National Representatives (SCNR), which to this day provides advice related to the Centre’s programme of work.
The early years
SACLANTCEN’s mission was to conduct research and provide scientific and technical advice in the field of anti-submarine warfareAnti-submarine warfare
Anti-submarine warfare is a branch of naval warfare that uses surface warships, aircraft, or other submarines to find, track and deter, damage or destroy enemy submarines....
to SACLANT. It could also be called upon to assist NATO nations in this domain. To carry out its mission the Centre chartered an old freighter, the Aragonese, which was quickly transformed into a research vessel, giving the organisation a sea-going capability. In 1964 the 2,800 tonne Maria Paolina G. was chartered, replacing the aging Aragonese.
In the early years the scientific programme was mostly centred on underwater acoustics
Underwater acoustics
Underwater acoustics is the study of the propagation of sound in water and the interaction of the mechanical waves that constitute sound with the water and its boundaries. The water may be in the ocean, a lake or a tank. Typical frequencies associated with underwater acoustics are between 10 Hz and...
, oceanography
Oceanography
Oceanography , also called oceanology or marine science, is the branch of Earth science that studies the ocean...
, systems concepts evaluation, and antisubmarine warfare. Understanding the complexities of how sound propagates underwater was, and continues to be, the basis for detecting and classifying submarines. Until the mid-1970s, the Centre’s research focus was mainly on deep waters, where Soviet nuclear submarines prowled for possible attack on the continental U.S. or to disrupt lines of communications between North America and Europe. In particular the Mediterranean Sea
Mediterranean Sea
The Mediterranean Sea is a sea connected to the Atlantic Ocean surrounded by the Mediterranean region and almost completely enclosed by land: on the north by Anatolia and Europe, on the south by North Africa, and on the east by the Levant...
and the Strait of Gibraltar
Strait of Gibraltar
The Strait of Gibraltar is a narrow strait that connects the Atlantic Ocean to the Mediterranean Sea and separates Spain in Europe from Morocco in Africa. The name comes from Gibraltar, which in turn originates from the Arabic Jebel Tariq , albeit the Arab name for the Strait is Bab el-Zakat or...
, which connected the two main operational areas, were of major interest. Studies in these two areas, carried out in the mid-1960s, resulted in significant developments in oceanographic buoy
Buoy
A buoy is a floating device that can have many different purposes. It can be anchored or allowed to drift. The word, of Old French or Middle Dutch origin, is now most commonly in UK English, although some orthoepists have traditionally prescribed the pronunciation...
technology. Two longer cruises were carried out in the Greenland-Iceland-U.K. Gap, normally known as the GIUK Gap
GIUK gap
The GIUK gap is an area in the northern Atlantic Ocean that forms a naval warfare chokepoint. Its name is an acronym for Greenland, Iceland, and the United Kingdom, the gap being the open ocean between these three landmasses...
, the only available outlet into the ocean for Soviet submarines operating from the Northern Fleet bases on the Kola Peninsula.
The Centre in the 1970s
SACLANCEN was a pioneer in the of use underwater buoy connectors, which led to a significant increase in the efficiency of data recording operations. At the same time, progress in electronics and the close links to the U.S. resulted in the updating of digital computing equipment. Activity at-sea remained pretty intensive, and in 1974 the Manning, a T-Boat built for the U.S. Army and previously used by Columbia UniversityColumbia University
Columbia University in the City of New York is a private, Ivy League university in Manhattan, New York City. Columbia is the oldest institution of higher learning in the state of New York, the fifth oldest in the United States, and one of the country's nine Colonial Colleges founded before the...
for oceanographic work, joined the SACLANTCEN fleet on loan from the U.S. Government.
In 1975, the scientific side of SACLANTCEN was reorganised into two main divisions: the Environmental and Systems Research Division and the Operational and Analytical Research Division. After more than a decade mostly dedicated to deep waters, shallow waters became a new priority as submarine activity in those areas was increasing and submarines were becoming quieter and available to more nations. To address shallow water problems, new factors had to be taken into consideration such as the type of ocean floor, sound reflection, reverberation, and clutter.
This led to further research on oceanography and acoustics with experiments carried out mostly along the Ligurian coast, while in the meantime new instruments were studied and developed for collecting data in shallower waters, although the improvement of data collection in deep waters continued. In the late 1970s, towed arrays made their presence in La Spezia. The Centre started testing the first experimental hydrophone linear array built by Hughes Aircraft
Hughes Aircraft
Hughes Aircraft Company was a major American aerospace and defense contractor founded in 1932 by Howard Hughes in Culver City, California as a division of Hughes Tool Company...
Corporation, on loan from the U.S. Office of Naval Research
Office of Naval Research
The Office of Naval Research , headquartered in Arlington, Virginia , is the office within the United States Department of the Navy that coordinates, executes, and promotes the science and technology programs of the U.S...
. Noise generated by the towing vessel proved to be the ultimate limiting factor. However the directionality (due to its length) and the possibility of positioning it at the optimal depth, as well as its passive and active capabilities, were the main advantages highlighted by tests. Based on studies carried out in 1976, two years later the Bistatic Active Towed Array (BITOW) sonar programme was launched. This system used a second vessel as auxiliary receiver, leading to a considerable increase of the detection range. The omnidirectional hydrophones used resulted in an inability to determine whether signals were coming from the right or left. SACLANTCEN resolved this problem by designing cardioid hydrophones which provided the left-right discrimination.
For towed arrays to be effective, the noise problem of the towing vessel needed to be solved. In 1984 the keel of a new research vessel specially designed for SACLANTCEN was laid at the Muggiano Fincantieri
Fincantieri
Fincantieri - Cantieri Navali Italiani S.p.A. is a shipbuilding company based in Trieste, Italy. It was formed in 1959 and is the largest shipbuilder in the Mediterranean, and one of the largest in Europe...
shipyard, a few hundred meters away from the Centre. The design priority for this 3,180-tonne ship was the reduction of ship radiated noise. This goal was accomplished with a double hull and a specially designed propulsion system. The NATO Research Vessel (NRV) Alliance was launched in 1986 and commissioned in 1988, replacing the Maria Paolina G. Since then, it has retained its reputation as one of the quietest ships afloat, spending an average of 170 days a year at sea supporting the Centre’s experiments.
The Centre, 1980 to 2003
In 1986 a 5-year survey of the Greenland, Iceland, and Norwegian Seas (GIN Sea) was started. New technologies were adopted to be able to collect data over long periods of time in a harsh environment, with problems ranging from thermal shock on sensors to difficulties in lowering the buoys into the water. A total of 31 buoys with 118 sensors were deployed to record data over one year. With a loss of buoys below 5 percent, this was a notable achievement in oceanographic research. While this experiment was underway, on 9 November 1989 the Berlin WallBerlin Wall
The Berlin Wall was a barrier constructed by the German Democratic Republic starting on 13 August 1961, that completely cut off West Berlin from surrounding East Germany and from East Berlin...
came down, marking the end of the Cold War. The Centre’s name change in 1987 to the SACLANT Undersea Research Centre clearly indicated the shift in focus from “Anti-Submarine Warfare” to “Underwater” research. The Iran-Iraq War
Iran-Iraq War
The Iran–Iraq War was an armed conflict between the armed forces of Iraq and Iran, lasting from September 1980 to August 1988, making it the longest conventional war of the twentieth century...
was a major event during that period; it led to the so-called “Tanker War”, where oil tankers moving through the Persian Gulf were threatened not only by Iranian air and small boat attacks, but also by some 150 sea mines of various types, mostly vintage, laid by Iran.
Mine countermeasures
During this period, the decrease in NATO's strategic interest in anti-submarine warfare (ASW) was matched by a corresponding increase in the significance of mine countermeasures (MCM), especially in the context of expeditionary operations. This was highlighted by operations in the Northern Persian Gulf in 1990-1991 when the projection of coalition power ashore was constrained by its maritime forces' ability to reduce, at an adequate rate, the risk posed by Iraqi mines. The new focus required higher sonar frequencies, the ability to identify mines masked by the environment, and an increase in the tempo of MCM operations. The Centre’s research activity was concentrated mainly on minehunting techniques, i.e. finding mines on the sea floor, which might be partly buried, discriminating mines from other harmless objects (clutter), and classifying them in order to take appropriate actions. High quality images were needed, which required high-frequency, high-resolution sonar imagery techniques. This in turn led to the development of automatic sonar interpretation systems, which reduced the amount of time needed to train personnel. The research focus shifted from manned minehunting to remote minehunting, with the ultimate objective of replacing a surface ship with robotic systems. This led the Centre to revive some studies on synthetic aperture sonar
Synthetic aperture sonar
Synthetic aperture sonar is a form of sonar in which sophisticated post-processing of sonar data are used in ways closely analogous to synthetic aperture radar. Synthetic aperture sonars combine a number of acoustic pings to form an image with much higher resolution than conventional sonars,...
(SAS), which had been shelved in the early 1970s as technologies were not yet mature at that time.
Anti-submarine warfare research
Submarine detection and classification remained on the research agenda, although the focus shifted gradually toward shallow waters. Low frequency active sonar (LFAS)
Sonar
Sonar is a technique that uses sound propagation to navigate, communicate with or detect other vessels...
research started in the early 1980s with a project to verify the feasibility of towed sonar systems, analysing typical performance-linked parameters such as propagation loss, signal coherence, noise, reverberation and target strength. SACLANTCEN links to military organisations were vital in obtaining support of naval submarine services, and numerous experiments were carried out in the Mediterranean. The shift in focus from deep to shallow waters came with the advent of small diesel-electric submarines that can operate close to home base. Detection in shallow waters is difficult due mainly to signal interferences from reverberation and clutter. New research programmes at the Centre investigated how to reduce the number of false alarms caused by reverberation, directional interference and target-like clutter when LFAS was used closer to the coasts. Fixed feature removal methods were investigated, while studies on detection optimisation and information extraction were also carried out to automate and improve LFAS performances in shallow waters. Research was also conducted on static deployable sonar systems.
Marine mammal programme
In May 1996, SACLANTCEN carried out a shallow water acoustic classification experiment in Greece
Greece
Greece , officially the Hellenic Republic , and historically Hellas or the Republic of Greece in English, is a country in southeastern Europe....
, in the Gulf of Kyparissiakos, with the source level towed by the NRV Alliance. During that time about 14 Cuvier’s beaked whales
Cuvier's Beaked Whale
Cuvier's beaked whale is the most widely distributed of all the beaked whales. It is the only member of the genus Ziphius. Another common name for the species is goose-beaked whale because its head is said to be shaped like the beak of a goose. Georges Cuvier first described it in 1823 from part...
stranded along the coast. As a result of the incident, SACLANTCEN hosted a bioascoustic panel with independent scientists to investigate the cause of the stranding. At that time, no clear-cut conclusions were made, as it was impossible to establish or to exclude a direct link between the experiment and the stranding. A recommendation was issued for environmental assessment procedures to be implemented, and this led in 1999 to the Sound Ocean Living Marine Resources (SOLMAR) programme at the Centre. Since SACLANTCEN’s location, La Spezia, is close to the Ligurian Sea International Marine Sanctuary
Ligurian Sea Cetacean Sanctuary
Originally called the International Ligurian Sea Cetacean Sanctuary , what is now known as the Pelagos Sanctuary for Mediterranean Marine Mammals is a Marine Protected Area aimed at the protection of marine mammals...
whose northern boundaries are the coasts of Italy and France while its southern limit is Corsica, the first aim of the SOLMAR programme was to monitor and acquire information on marine mammals living in that area. This was carried out both visually and acoustically during a series of annual sea trials known as SIRENA.
Controlled exposed experiments have also been undertaken to verify any possible relationship between noise and marine mammal behaviour. Oceanographic measurements were also carried out to better understand the environment where the marine mammals live. Following other strandings in 2000 and 2002 in areas where NATO exercises were conducted, high priority was assigned to mitigate risks to marine mammals during NATO naval exercises. In 2002, the SOLMAR programme became the Marine Mammal Risk Mitigation (MMRM) project. Activities continued focusing on the optimisation of the risk mitigation package designed by SACLANTCEN, which includes passive acoustic monitors, a predictive habitat model, a sound propagation model, a website with planning and training aids, and a guiding policy for the use of active sonar in experiments. The package was updated following each cruise, which contributed to increased knowledge of marine mammal behaviour. A Human Diver and Marine Mammal Incident Action Team manned by personnel from the Centre was established and stood ready to deploy in case of stranding or diving incidents, although no strandings have been linked to SACLANTCEN operations since the SOLMAR/MMRM programme was established. One of the values of the project was that an increasing number of independent scientific and environmental organisations began to cooperate with the Centre in this research area.
Military oceanography (MILOC)
Although both theoretical studies and MILOC operations partly covered shallow waters, such as the Shallow Meadow campaign in the Baltic in 1983-1987, most of SACLANTCEN activities were initially dedicated to deep waters, oriented towards antisubmarine warfare and the protection of sea lines of communication. The output of those activities were new concepts for the improvement of sonar or the development of underwater detection systems. MILOC activities also resulted in oceanographic and acoustic databases that supported modelling, resulting in improved exploitation of operational sensors.
In a post-Cold War environment, crises tended to be regional, taking place in unknown coastal waters, with operations involving joint and combined forces. MCM and ASW activities related to those operations required different knowledge of the related environment, silent diesel-electric submarines and mines becoming the dominant threat. Higher resolution models were needed as well as geographical information systems (GIS) containing all possible information related to the area. The challenge was to provide information in a short time frame. The new name of this task became Rapid Environmental Assessment, or REA, which was identified by SACLANT as a new underwater operational requirement in 1995.
The Adriatic Sea
Adriatic Sea
The Adriatic Sea is a body of water separating the Italian Peninsula from the Balkan peninsula, and the system of the Apennine Mountains from that of the Dinaric Alps and adjacent ranges...
became the focus of attention in 1992 when NATO took part in a monitoring operation to verify sanctions imposed on Serbia and Montenegro by the United Nations. It was the start of the Balkan crisis
Yugoslav wars
The Yugoslav Wars were a series of wars, fought throughout the former Yugoslavia between 1991 and 1995. The wars were complex: characterized by bitter ethnic conflicts among the peoples of the former Yugoslavia, mostly between Serbs on the one side and Croats and Bosniaks on the other; but also...
, which would involve NATO naval forces for several years. A shallow water environment with intense trawler fishing activities, such as the Adriatic, required robust new instrumentation for oceanographic surveys conducted to support naval operations. SACLANTCEN designed an Acoustic Doppler Current Profiler
Acoustic Doppler Current Profiler
An Acoustic Doppler Current Profiler is a sonar that attempts to produce a record of water current velocities for a range of depths. They are made of ceramic materials, and contain transducers, an amplifier, a receiver, a mixer, an oscillator, a clock, a temperature sensor, a compass, a pitch and...
(ADCP) with a low profile that is resistant to fishing trawlers. Named Barny, the ADCP sensors were at 0.5 m from the bottom providing optimal boundary layer coverage, and following tests of the prototype built at SACLANTCEN, it was mass produced by a commercial company under Centre supervision. The original model was equipped with a self-recoding device and had to be picked up for data retrieval after six months. An enhanced version better suited for small boat operations was developed together with the U.S. Naval Research Laboratory in 1996.
The need to measure ocean properties in the shortest possible time with expendable equipment led to the development of the Shallow-Water Expendable Environmental Profiler (SWEEP). SWEEP, which could operate in waters up to 100 meters deep, was moored to the bottom and at pre-programmed intervals would surface to transmit physical data collected on the bottom and while traveling to and from the surface. However, SWEEP was not usable in areas with trawler fishing activities. SACLANTCEN merged the features of Barny and SWEEP and developed the Shallow-water Environmental Profiler Trawl-safe Real-time (SEPTR), a buoy similar to Barny but with a profiler similar to the one used on SWEEP, which would surface at fixed intervals. Tested in 2000, SEPTR was available for use in the ASCOT01 sea trial and updated versions are still in operation today.
Operations research and analysis
Operational research has been a key activity at SACLANTCEN since its creation. Mostly dedicated to operational analysis and operational support, numerous software aids developed in the 1990s were provided to NATO nations through the Centre’s Scientific Committee of National Representatives (SCNR). Leveraging the knowledge acquired from different areas of activities, and showing how a multidisciplinary approach can produce useful tools for warfighters, SACLANTCEN was asked by several naval commands to provide them with antisubmarine warfare planning tools. The Centre was also involved in studies related to changes in naval forces after the end of the Cold War, as well as in exercise evaluation. In 1993 the Commander Allied Naval Forces Southern Europe requested support for planning ASW operations in the Mediterranean, in order to optimise the protection of shipping in the Mediterranean.
With the increase in mine-related activities, SACLANTCEN also took part in the development of MCM Exclusive Planning and Evaluation Tool (EXPERT), led by NATO Consultation, Command and Control Agency
NATO Consultation, Command and Control Agency
The NATO Consultation, Command and Control Agency was formed in 1996 by merging the SHAPE Technical Centre in The Hague, Netherlands; and the NATO Communications and Information Systems Agency in Brussels, Belgium...
(NC3A). MCM EXPERT helps commanders optimise mine search operations. Similarly the Electronic Minefield Referee (EMIR) tool developed by the operational analysis group was widely used in NATO and national exercises. Experts from the Centre often deployed onboard MCM vessels during exercises to compare predicted performances with actual minehunting results. They also provided advice on how to best use the knowledge on environmental conditions to clear more mines.
Staffing and Facilities
The number of scientists at the Centre was authorised at a maximum of 50, hired mostly on limited-term contracts. This rotation of personnel enabled a regular inflow of new ideas and, over time, resulted in the establishment of a network of close contacts between SACLANTCEN and the national research centres as well as many universities and private companies, to which many scientists returned after their work at the Centre. The scientific outputs from the Centre were especially valuable to the smaller NATO nations, whose research capabilities were behind those of the larger nations, thus helping to reduce the gap between their institutions and those in the U.S. and U.K., for example. Scientists were supported by administrative and technical teams, in particular, an engineering department that provided the means to carry out the experimental work needed to develop or verify scientific theories. SACLANTCEN also features a unique facility in Europe: the Oceanography Calibrating Laboratory, created in the early 1980s, which provided instrument calibration according to the World Ocean Circulation Experiment (WOCE) standard in support of the Centre’s activities as well as for most NATO navies and research laboratories.Most of the research activities required the support of ship assets managed by the SACLANTCEN Ship Management Office. At the turn of the century the T-Boat Manning had been in service for 45 years. The advantage of operations carried out with a silent ship were highlighted by the activity of NRV Alliance, which recorded about 170 days per year at sea, mostly dedicated to the Centre’s activities but also chartered to other organisations. In the late 1990s the Ship Management Office developed the mission profile and requirements for a new ship with a size comparable to that of the Manning but with characteristics similar to the NRV Alliance in terms of silent movement and scientific support capabilities. Once funds were obtained from NATO, a contract with McTay Marine Ltd. was signed in 2000 and the Coastal Research Vessel (CRV) Leonardo was delivered to NATO in the UK on 31 July 2002, a few months after the lease of the Manning had expired. CRV Leonardo was commissioned in La Spezia on 6 September 2002 as the first Italian public vessel.
Into the New Millennium
During the 2002 Prague Summit2002 Prague summit
The 2002 Prague summit was a NATO summit where the heads of state and government of the NATO member states met. Seven states were at this summit invited to begin accession talks with NATO: Bulgaria, Estonia, Latvia, Lithuania, Romania, Slovakia and Slovenia. NATO's post-Cold War Open Door Policy...
, NATO’s military command structure was reorganized with a focus to become leaner and more efficient. Supreme Headquarters Allied Power Europe was to become the single strategic command focused on NATO field operations under the name Allied Command Operations (ACO) while Supreme Allied Commander Atlantic would be focused on transforming NATO operations, changing its name in Allied Command Transformation
Allied Command Transformation
Allied Command Transformation is a NATO military command, which was formed in 2003 after North Atlantic Treaty Organisation restructuring....
(ACT). ACT was formally established on June 19, 2003, and the same day SACLANTCEN changed its name into the NATO Undersea Research Centre
NATO Undersea Research Centre
The NATO Undersea Research Centre , based in La Spezia, Italy, is a research organisation under NATO's Allied Command Transformation, which is headquartered in Norfolk, Virginia. NURC conducts research and develops products to support NATO maritime operations and to support the continuous...
(NURC).