Thomson Marconi Sonar

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Thomson Marconi Sonar Ltd.
Fate Renamed Thales Underwater Systems
Successor Thales Underwater Systems
Founded 1990
Defunct October 2001
Headquarters Weybridge, United Kingdom

Thomson Marconi Sonar (TMS) was formed as Ferranti Thomson Sonar Systems (FTSS) in 1990 by the merger of the sonar systems businesses of Thomson-CSF and Ferranti. The head office of FTSS was at Cheadle Heath, Stockport, with subsidiary sites in Church Crookham, Hampshire, Weymouth, Dorset, Bridlington, Yorkshire and Rochester (this site was an ex GEC site).

Sonar technique that uses sound propagation

Sonar is a technique that uses sound propagation to navigate, communicate with or detect objects on or under the surface of the water, such as other vessels. Two types of technology share the name "sonar": passive sonar is essentially listening for the sound made by vessels; active sonar is emitting pulses of sounds and listening for echoes. Sonar may be used as a means of acoustic location and of measurement of the echo characteristics of "targets" in the water. Acoustic location in air was used before the introduction of radar. Sonar may also be used in air for robot navigation, and SODAR is used for atmospheric investigations. The term sonar is also used for the equipment used to generate and receive the sound. The acoustic frequencies used in sonar systems vary from very low (infrasonic) to extremely high (ultrasonic). The study of underwater sound is known as underwater acoustics or hydroacoustics.

Thomson-CSF electronics and defence contractor

Thomson-CSF was a major electronics and defence contractor. In December 2000 it was renamed Thales Group.

Ferranti British electrical engineering company

Ferranti or Ferranti International plc was a UK electrical engineering and equipment firm that operated for over a century from 1885 until it went bankrupt in 1993. The company was once a constituent of the FTSE 100 Index.

GEC acquired Ferranti's share of the business in 1995 to form Thomson Marconi Sonar.

With the merger of GEC's defence business Marconi Electronic Systems and British Aerospace in 1999, the resulting BAE Systems acquired Marconi's 49.9% share in TMS. BAE (through an options agreement) forced Thomson, renamed Thales, to purchase its stake in 2001. The company was renamed Thales Underwater Systems.

Marconi Electronic Systems (MES), or GEC-Marconi as it was until 1998, was the defence arm of The General Electric Company (GEC). It was demerged from GEC and acquired by British Aerospace (BAe) on 30 November 1999 to form BAE Systems. GEC then renamed itself Marconi plc.

British Aerospace Aerospace and defense company

British Aerospace plc (BAe) was a British aircraft, munitions and defence-systems manufacturer. Its head office was at Warwick House in the Farnborough Aerospace Centre in Farnborough, Hampshire. Formed in 1977, in 1999 it purchased Marconi Electronic Systems, the defence electronics and naval shipbuilding subsidiary of the General Electric Company plc, to form BAE Systems.

BAE Systems plc is a British multinational defence, security, and aerospace company. Its headquarters are in London in the United Kingdom with operations worldwide. It is the largest defence contractor in Europe and among the world's largest defence companies; it was ranked as the third-largest based on applicable 2017 revenues. Its largest operations are in the United Kingdom and United States, where its BAE Systems Inc. subsidiary is one of the six largest suppliers to the US Department of Defense. Other major markets include Australia, India, and Saudi Arabia, which account for about 20% of BAE's overall sales. It is the biggest manufacturer in Britain. The company was formed on 30 November 1999 by the £7.7 billion merger of two British companies: Marconi Electronic Systems (MES) – the defence electronics and naval shipbuilding subsidiary of the General Electric Company plc (GEC) – and British Aerospace (BAe) – an aircraft, munitions and naval systems manufacturer.

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Thales Underwater Systems (TUS), formerly known as Thomson Marconi Sonar, is an international defence manufacturer specialising in sonar systems for submarines, surface warships, and aircraft as well as communications masts and systems for submarines. TUS is a subsidiary of Thales Naval, part of the Thales Group, and has sites in the United Kingdom, France, and Australia. TUS is made up of three subsidiary companies: TUS Ltd. in the UK, TUS SAS in France and TUS Pty. in Australia, but it operates as a single company with headquarters in southern France. TUS had annual sales of €400 million in 2006 and employed around 2,100 people.

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