Along with an imaging-infrared (IIR) air-to-air missile effort, the Luoyang Optoelectro Technology Development Center is also involved in developing a man-portable I2R surface-to-air missile system, the QW-4. This program is being led by the China Aerospace Science and Industry Corp. (Cosic). An effective I2R man-portable surface-to-air missile would provide an even greater capability against low-altitude targets. Luoyang is working on the detector array for the QW-4, but the missile was only in development as of late 2002. Design criteria for the QW-4 released by Cosic claimed a maximum slant engagement range of 6,000 meters (19,680 ft.) and a 4,000-meter maximum altitude.
QW-4 was the latest model in the development of the avant-garde series. The biggest difference between it and the previous model is that it uses an infrared imaging seeker, which has better performance than ordinary point-element infrared detectors. Since ordinary unit/multi-element infrared detectors can only detect spot heat signals, they are generally sensitive to the heat radiation of jet aircraft exhaust. Even the cooled infrared unit/multi-element seeker can only detect the skin of the rear fuselage.
The so-called omnidirectional attack unit infrared detector generally has a blind zone of about 30 degrees when detecting head-on flying targets, which makes the missile's head-on attack distance much lower than the missile's actual flight distance, which greatly reduces its performance. The emergence of infrared imaging seeker solves this problem, because its detection depends on the different emissivity of the target and the background, and the guidance information source is an image, which is difficult to be disturbed, and it has a longer detection range and a true omnidirectional attack. ability. Therefore, the infrared imaging seeker will be the future development trend of infrared guided missiles.
In addition, QW-4 also uses a laser proximity bomb + bump fuze and electric rudder. Compared with radio proximity and infrared proximity fuzes, laser proximity fuzes have stronger anti-interference ability, which better solves the phenomenon that ultra-low-altitude flight fuzes are prone to false activation. Compared with portable air defense missiles that simply use impact fuzes The proximity fuze can make the missile detonate next to the target, which is very suitable for hitting small targets such as cruise missiles that are difficult to directly hit.
The use of electric rudder makes the actuation device of the missile control system simpler, and has a smoother flight curve, which is beneficial to improve the accuracy of hitting. The combat distance of the missile is 500~6000m, the combat altitude is 4~4000m, and its combat altitude reaches 4m, which is very conducive to attacking ultra-low flying targets and sea-skimming missiles and helicopters hovering 2-3 meters above the ground. . The flight speed of Mach 2 has also been improved for the old model, which can attack faster flying targets and has a larger combat airspace. It can be said that the emergence of QW-4 has put us on the same level as the latest portable air defense missiles of advanced Western countries. We have reason to believe that QW-4 will be a strong competitor in the future portable air defense missile market.
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