Transporter erector launcher
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A transporter erector launcher (TEL) is a vehicle with an integrated prime mover that can carry, elevate to firing position and launch one or more missiles. Such vehicles exist for both surface-to-air missiles and surface-to-surface missiles. Early such missiles were launched from fixed sites and had to be loaded onto trucks for transport, making them more vulnerable to attack since once they were spotted by the enemy they couldn't easily be relocated, and if they were it often took hours or even days to prepare them for launch once they reached their new site.
A transporter erector launcher and radar (TELAR) is the same as a TEL but also incorporates part or all of the radar system necessary for firing the missile(s). Such vehicles have the capability of being autonomous, greatly enhancing their effectiveness. With this type of system each vehicle can fight regardless of the state or presence of support vehicles. The TEL or TELAR may have a rotating turntable that it can use to aim the missiles. The vehicle may have to turn to aim the missiles or they may fire straight up.
Conversely, a transporter launcher and radar (TLAR) is the same as a TELAR without the erector capability (presumably because the missile does not need to be erected for launch).
Usually a number of TELs and TELARs are linked to one Command post vehicle (CP or CPV). They may utilise target information from Target acquisition, designation and guidance radar (TADAGR) or, simply, TAR.
A Russian SA-12 TEL in transit mode.
A Russian SA-10 TEL ready for launch.
A French Pluton missile in transit mode