Actually, the Kashtan is an all-weather system that uses both radar and/or electro-optronic guidance.
Here's a full description of the Kashtan-M CIWS system:
The Kashtan-M CIWS System is an all-weather close in weapons system (CIWS) that is made up of a command module and up to eight combat modules per system depending on the size of the ship. For example, the Russian Kuznetsov and the Indian Vikramaditya aircraft carriers each have eight combat modules.
The command module's primary function is to detect, track targets, and then distribute the targeting data to the combat modules. It also interrogates any IFF for approaching threats to discriminate targets and make sure that properly emitting IFFs are not engaged. In order to accomplish all of this, the command module has a 3-D rader for target detection, and an all weather, multi-band integrated control system.
Once data for viable targets is handed off to the combat modules, the combat modules then automatically track and engage targets using either radar, electro-optronics (ie. FLIR), or both. The targets are engaged with missiles and/or guns. Missiles for target ranges of 1,500 - 10,000 meters, and guns for ranges of 300 meteres to 5,000 meters.
The missiles used on the Kashtan-M are the Russian 9M311-1E missile which NATO calls the SA-N-11 Grisom. These missiles have a range of 1,500 to 10,000 meters. The missile is steared towards the target using the radar and/or electro-optronic guidance of the combat module. When approaching terminal flight, an active laser and/or radio fuse is triggered. This proximity detector detonates the missile warhead as soon as it is within 5 meters of the target. The 9 kilograms (20 lb), warhead which is a continuous-rod system consisting of 600 mm long 6 to 9 mm diameter rods with a flower-like cross section. There is also a fragmentation outer layer to the warhead made up of steel cubes weighing 2–3 grams each. The detonation causes these layers to form a 360 degree cloud of shrapnel and fragments, over 5 meters in radius, that damage or destroy any missile within its radius.
The guns used on the Kastan-M are the Russian Gryazev-Shipunov GSh-6-30 (designated as the AO-18KD on the Kastan-M system) 30 mm gatlin guns which have a 10,000 round per minute fire rate and a range of 300 to 5,000 meters. This produces a stream of projectiles that are steared into direct contact with the missile by the radar and/or electro-optronic guidance system of the combat module. Upon making contact with the missile, at the extensive combined closing speed, the missile is destroyed. Individually, each of the guns has a higher rate of fire when compared to CIWS guns from other nations such as the GAU-8, the Goalkeeper or the Phalanx system. Along with its very high rate of fire, the heavy, 390 g projectiles are comparable to the depleted uranium rounds used by some of these other systems.
By combining both guns and missiles into one radar and electro-optronic guided CIWS, the opportunity for destruction of incoming targets is heightened over systems that use only one system. Other nations offset this by combining two systems to achieve the same thing. For example, the United States and its allies use combinations of the varuious version of the Standard Missiles for long-range intercepts, the Evolved Sea Sparrow Missiles (ESSM) for medium to short range intercepts, the Rolling Air Frame(RAM) missiles for short range missile engagements,and then back these up with either the 20mm, six-barrelld Phalanx system, or the 30mm six-barreled Gaolkeeper sytem for very close-in gun protection.
Our own NavyReco has
on their site, as does Naval-Technology, Global Security, and others.
