Find a Security Clearance Job!

Military


LeiShi-6 GPS-guided glide bomb

The 2006 Zhuhai Air Show exhibited the domestic Lei Shi-6 [Thunder Stone - 6] type guided glide bomb. The Lei Shi-6 exhibited was divided into two levels of 500 kg and 250 kg. Among them, the green bullet is a 500 kg bomb of Lei Shi-6. The bomb was modified on the basis of a traditional 500 kg class air bomb, and a pair of rearwardly folded wings were added to the upper part of the original bomb body.

After the bomb is released from the aircraft, the Lei Shi-6 guided glide bomb wing kit will be automatically deployed, and the bomb will get better aerodynamic performance due to the increase of the lift area, thereby greatly increasing the projection distance. At the end of the original bomb, an X-shaped control rudder surface was installed to steer the bomb to the target by receiving satellite navigation signals.

The black body of the LeiShi-6 is a 250 kg class guided bomb that was modified from the Air Force's existing vintage bombs and is a retrofit for the military to upgrade inventory ammunition. The cost is cheap. It is only necessary to install the Rex 6 wing assembly on the original projectile. The Lei Shi 6 gliding guided bomb uses an elastically-expandable wing kit that is secured by a metal device that springs back and two safety straps wrapped around the body. A bolted tail is installed at the rear of the bomb, which may be equipped with a satellite navigation receiver and a flight control/drive system for guidance.

The LS-6 has been improved from a 500 kg class air bomb and may be used to combat critical infrastructure or other valuable fixed targets. The performance of this weapon depends primarily on whether China has accurate satellite navigation data and the level of modern mission planning systems that use such data. The LS-6 does not seem to have a seeker (such as a laser or electro-optical device), and is not even ready to install such a device. Instead, the LS-6 may use a standard commercial GPS global positioning system. China may also use the technology of Russia's more limited "GLONASS" satellite navigation system.

China began to have a keen interest in precision-guided weapons in 1990. During this period, not only did it produce its own TV-guided surface-to-surface missiles, but it also developed weapons such as laser-guided bombs. Chinas impression of the JDAM bomb was even deeper. On May 8, 1999, the Chinese Embassy in Yugoslavia was bombed by the United States. Among the weapons used, JDAM was the first. China's military said they must also possess such weapons, or China must only be beaten like the Manchu.

The research on GPS weapons in China began in 1990. Since China did not have the ability to master GPS signal sources, it took a long time to demonstrate and consider this application. Finally, it was decided to develop export-oriented products.

The extended-range GPS/INS guided unpowered glide bomb, which was successfully developed, was named "Lei Shi" series. The production unit displayed the 500 kg class Leishi-6 at this Zhuhai Air Show (LS- 6), and clearly expressed the intention of export.

It was believed that this bomb is most likely to be paired with China's newly developed FC-1 light multi-role fighter. His main customer, Pakistan, had long been eager to possess such weapons and attack capabilities. The FC-1 avionics system already contained the inertial navigation system with GPS has the ability to directly use such weapons.

The Leishi-6 is designed with two modules. The main control and guidance modules are placed in the extended tail. The extended tail compartment accommodates the GPS receiver, INS navigation device, flight control computer, and steering gear. And the power supply, 4 X-arranged rudders provide heading stability and control.

The wing is mounted on the upper part of the bomb and is installed through the original hanging point. The wing assembly has a flat, low-drag surfboard-shaped load-bearing transition plate through which the bomb is mounted on the aircraft. The bomb is fixed to the bomb wing frame, and the wing wing adopts a flat rectangular wing folded backward.

The folding point of the folding hinge of the folding wing is designed to avoid the unstable posture caused by the complex torque relationship between the aerodynamic center and the center of gravity during the unfolding process. This can greatly reduce the variation range of the lift center. Because the tail is appropriately lengthened, a longer wing can be designed. After the wing is folded, it is in front of the tail, and there is no interference between them. It is rigidly locked to form a flat wing. The gliding ratio of the entire assembly is about 5.3, which is basically the same as similar products.

The appearance of LeiShi-6 marked the formation of the all-round precision strike capability of the Chinese Air Force. Traditionally, the impression was that the Chinese Air Force had stayed at the low-tech level of close-range attack. A large number of old-fashioned Q-5s relied on light rockets to hit ground targets, even in the Sino-Russian joint military exercises. Such rockets are fired using expensive and advanced Su-27 fighters.

However, the public appearance of a series of domestic precision guided weapons in recent years has shown that the Chinese Air Force is undergoing modernization. Laser-guided bombs and long-range gliding guided bombs provide a solid material basis for the Chinese Air Force to achieve surgical strikes.

Not every Chinese fighter can be used. It can only be used by fighters with advanced electronic tactical maps and electronic geographic information systems. The old aircraft can be replaced by a new inertial navigation system with built-in GPS and corresponding software. The latest domestic third-generation aircraft such as the J-11, FBC-1 Flying Leopard and other modern fighters can be used directly. Due to the long range, the FBC-1 with radar synthetic aperture imaging capability may be more accurate and perform better.

Leishi-6 is compatible with ordinary Chinese bombs, and is cheap and easy to use on a large scale. It has a long range and can be used to combat fixed targets of various known coordinates, such as airports and ports, bridges, buildings, etc. According to the experience of the United States in using the WCMD wind-corrected munition and JDAM joint-guided bombs in the second Iraq war, such ammunition is most suitable for greatly improving the performance of older aircraft.

For example, the Chinese bomber units are mainly equipped with H-6 bombers. This old-fashioned bomber is slow to fly, but if it can attack the target 50 kilometers away, it might not be seriously threatened by ground-to-air missiles. China still retains a large number of H-6, after modernization, this aircraft with new ammunition might sprout a new life.

The Chinese Air Force is beginning to fully use the electronic geographic information system, which is a large-scale comprehensive coordination of investigation, intelligence gathering, tactical mapping and many other aspects. engineering. This system is different from the tactical map of the previous relative coordinate system. Based on the longitude and latitude coordinate system of the global positioning system, the unified system facilitates the exchange of information and information, meets the requirements of the information age, and can be seamlessly connected with GPS information. In addition, the Galileo system in Europe was also put into use in 2014.

Both Russia and China had their own plans to establish a global satellite positioning and navigation system. Because there are so many systems to choose from, the stability and security of the signal are guaranteed in the long run, and even if the satellite signal is missing, Similar functions can also be provided locally by erecting terrestrial wireless stations on the ground.

"Lei Shi" seems to be a series of products at present. Although it only publicly displays LeiShi-6, it can be speculated according to the number. Its launch speed of 250 m/s is not high at high altitude. There should be room for expansion, and the faster the carrier launches, the farther the gliding distance will be.

It is worth noting that the "Leishi" series only uses simple GPS/INS guidance, and does not use more precise terminal guidance, such as imaging 3D laser radar, millimeter wave radar, infrared imaging, etc. Used as a general-purpose ammunition, although GPS/INS munitions can be launched, their accuracy and ability to combat maneuvering targets are not as good as laser-guided bombs.

The current development of small-diameter bombs in the United States is complicated. The combination of terminal guidance and GPS/INS will eventually replace the laser-guided bombs that are currently important but increasingly difficult to survive. China has made advances in research on simple imaging laser radar since 2004. This laser using UHF continuous pulses The simple amplitude and phase synchronization to obtain the distance information of the CCD pixels to form a 3D image of the radar takes into account both imaging and radar, and the cost is similar to that of the ordinary imaging system, which has great potential.

It is believed that a simple cruise missile-type glide bomb that increases the longer range of the powertrain must also be planned. From the long-term plan of the United States, adding a rocket or turbojet engine with a small thrust can increase the range by 2-5 times, and the accuracy will not be greatly affected. The US glide bomb can increase the range gain by about 30% after adding a 40kg rocket engine. This engine is not specially designed. It has a short burning time and thrust. Inappropriate, the glide bomb has a high lift-to-drag ratio. It only needs 50 kg of thrust to maintain a speed of Mach 0.8. If the design is reasonable, a 40 kg rocket can provide such a large thrust of about 40 to 50. In seconds, it is possible to increase the range by about 30%. A 50-kilogram drone with a micro-turbojet engine assembly can provide more than 15 minutes of power, enough to fly more than 200 kilometers.

In terms of precision-guided weapons, China has lagged behind the world. A weapon like a laser-guided bomb was only used after 30 years of use in the United States. But this time, in the development of GPS-type attacking weapons outside the air defense zone, China finally adjusted its pace and caught up with the world trend. The emergence of LeiShi-6 shows that China has narrowed the gap with developed countries in the development and application of such weapons.




NEWSLETTER
Join the GlobalSecurity.org mailing list


Unconventional Threat podcast - Threats Foreign and Domestic: 'In Episode One of Unconventional Threat, we identify and examine a range of threats, both foreign and domestic, that are endangering the integrity of our democracy'


 
Page last modified: 19-01-2019 18:43:46 ZULU