The Georges Leygues class (Type C70 AS or Type F70 AS) consisted of seven guided-missile destroyers built for the French Navy during the Cold War. They were multi-role ships due to their Exocet and Crotale missile armament, making them especially suitable for the defence of strategic positions, show of force operations, or as high seas escorts. The design was initially officially known as a "corvette" with the designation C70, but were internationally labelled an "anti-submarine destroyer" (hence the "D" in the hull numbers). Subsequently, the French referred to the ships as "frigates" with the designation F70.
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In this Dossier
Georges Leygues-class frigate in the context of Sonar
Sonar (sound navigation and ranging or sonic navigation and ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, measure distances (ranging), communicate with or detect objects on or under the surface of the water, such as other vessels.
"Sonar" can refer to one of two types of technology: passive sonar means listening for the sound made by vessels; active sonar means 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 for robot navigation, and sodar (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 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.
Georges Leygues-class frigate in the context of French frigate La Motte-Picquet
La Motte-Picquet was one of seven F70 type guided-missile frigates built for the French Navy during the 1980s. Completed in 1988, she served during the Cold War. The ship was decommissioned in October 2020.