ARTHUR ( radar ) ARTHUR is an acronym for " Artillery Hunting Radar " , a mobile radar system originally developed jointly for and in close co - operation with the Norwegian and Swedish armed forces by Ericsson Microwave Systems . This field artillery acquisition radar was developed for the primary role as the core element of a brigade or division level counter battery sensor system . The vehicle carrying the radar was originally a Bandvagn 206 developed and produced by Hägglunds , but is now more often delivered on trucks with ISO fasteners . The radar is now developed by SAAB Electronic Defence Systems ( after EMW was sold to SAAB in June 2006 ) and Saab Technologies Norway AS . Deployment . The ARTHUR detects hostile artillery by tracking projectiles in flight . The original ARTHUR Mod A can locate guns at 15 – 20 km and 120 mm mortar s at 30 – 35 km with a circular error probable of 0 . 45 % of range . This is accurate enough for effective counter - battery fire by friendly artillery batteries . ARTHUR can operate as a stand - alone medium - range weapons locating radar or a long - range weapon locating system , consisting of two to four radars working in coordination . This flexibility enables the system to maintain a constant surveillance of an area of interest . The upgraded ARTHUR Mod B meets the British Army ' s MAMBA requirement for locating guns , mortars or rockets . It can locate guns at 20 – 25 km and 120 mm mortars at 35 – 40 km with a circular probable error of 0 . 35 % of range . MAMBA was successfully used by the British Army in Iraq and Afghanistan . ARTHUR Mod C has a larger antenna and can detect guns at 31 km , mortars at 55 km and rockets at 50 – 60 km depending on their size , and locate targets at a rate of 100 per minute with CEP 0 . 2 % of range for guns and rockets and 0 . 1 % for mortars . It can be carried by a C - 130 or slung under a heavy lift helicopter such as a Chinook . Its air mobility allows it for use by light and rapid reaction forces such as airborne and marine units . Nordic Battle Group . The use of the ARTHUR in Nordic Battle Group s will primarily concentrate on preventing the use of artillery barrage s in civilian areas , since the radar can identify an artillery unit guilty of targeting civilians . It will also be used to warn friendly mission troops of incoming indirect fire . Operational modes . ARTHUR can be operated in two main modes : Weapon locating and Fire direction . Weapon locating is used to determine the location of the guns , mortars or rocket launchers that fired and their target area . Fire direction is used to adjust the fire of own artillery onto target coordinates . Weapon locating . When locating enemy artillery , the radar tracks the up - going trajectory of shells , calculates their points of origin and impact and , with other information , displays it to the radar operator ( s ) . Depending on national tactics , techniques , procedures , the commander ' s orders and the situation , this information may be used to alert any troops in the impact area and engage the hostile batteries with counter - battery fire . If the users have digital communications networks these messages may be sent automatically . The ARTHUR can determine whether the artillery piece is of artillery - type , rocket - type or mortar - type based upon the curve of the trajectory , the munition ' s speed , and its range . Fire direction . When in Fire direction mode the radar calculates the expected impact location of the friendly fire . From this corrections are calculated and reported to hit the target coordinates . Sweden also uses the radar for ' fall of shot ' calibration . However , other western armies would consider it insufficiently accurate for the purpose and use muzzle velocity radars mounted on guns for far more accurate results . Threats . Radars are easy to detect and locate if the enemy has the necessary ELINT / ESM capability . The consequences of this detection are likely to be attack by artillery fire or aircraft ( including anti - radiation missiles ) or ECM . In other circumstances ground attack with direct fire or short range indirect fire are the main threat . The usual measures against the first are using a radar horizon to screen from ground based detection , minimising transmission time , deploying radars singly and moving frequently . Swedish ARTHUR units usually operate in groups of three that guard the immediate surroundings . Users . Known users are Sweden , Norway , Denmark ( being phased out under the last agreement for the Danish Defence ) , Canada ( leased ) , Italy ( leased ) , Czech Republic , Greece , Spain , Singapore , Malaysia , UK ( leased Mod A until MAMBA available ) . South Korea has reportedly purchased ARTHUR Mod C in 2007 , in 2011 Saab received a follow up order .