The SPYDER (Surface-to-air PYthon and DERby) is a short and medium range mobile air defence system.
It is a low-level, quick-reaction surface-to-air missile system capable of engaging aircraft, helicopters, unmanned air vehicles, drones, and precision-guided munitions.. The SPYDER launcher is designed to fire Python-5 and Derby surface-to-air missiles which share full commonality with the air-to-air missiles.
There are two variants of the SPYDER: the SPYDER-SR (short range) and the SPYDER-MR (medium range). Both systems are quick reaction, all weather, network-centric, multi-launchers, and self-propelled.
Python-5 :
A beyond-visual-range missile, it is capable of "lock-on after launch" (LOAL), and has all-aspect/all-direction (including rearward) attack ability. The missile features an advanced electro-optical infrared homing (with imaging infrared) seeker which scans the target area for hostile aircraft, then locks-on for terminal chase.
Derby : The Derby is an active radar homing surface to air missile that provides the SPYDER missile system with a fire-and-forget option due to its active radar guidance

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