Japan is also developing the XAAM-4 to succeed the Sparrow. The initial letter of the XAAM-4, "X," indicates that this model is under development and that this is the fourth AAM developed in Japan. The XAAM-4 is composed of the guidance control blocks controlling target acquisition, guidance and flight, the warhead which destroys the target, the propulsion system for flying the missile, wings, etc. The transmitter used in the XAAM-4 is compact and has an extremely high performance thanks to the extensive use of Japan's own advanced semiconductor technology.
The XAAM-4 has a longer range than the Sparrow and uses a composite guidance system, with which it is initially guided according to the target data transmitted from the firing aircraft but it later starts to emit radar waves itself to acquire and track the target. The firing aircraft carrying the XAAM-4 fires it from a long distance and can retreat before it hits the target to start the next action. This makes it possible to assure a higher survival probability of the firing aircraft than the previous MRMs based on a semi-active radar homing system.
As the XAAM-4 is based on an active radar homing system, the firing aircraft can fire several missiles independently to hit multiple targets acquired and tracked. This leads to simultaneous measures against multiple targets. The use of advanced semiconductor technology has made it possible to mount a signal processor with very complicated signal processing in the small space available in a missile. This has given the XAAM- 4 an excellent ECCM capability which allows it to acquire and track the target even when subject to enemy ECM.
By utilizing and extending the component technology of the New Medium Range Air-to-Air Missile (XAAM-4) (which has an active radar homing seeker), the New Short Range Ship-to-Air Missile System seaborne missile system will cope simultaneously with multiple targets including low altitude incoming threats and high speed diving threats to protect naval vessels in the twenty-first century.
Contractor Entered Service Total length Diameter Wingspan Weight Warhead Weight Propulsion Maximum Speed Maximum effective range Guidance mode Single-shot hit probability