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Lei-Ting / Tian-Ge

The 9th Zhuhai Airshow November 2012 saw a new family of laser-guided bombs (LGB) utilizing LT PGB upgrade kit designated as Tian Ge series (or Tiange), which is the ancient Chinese name for the constellation Botes, the Ploughman. In Chinese, this is a polysemous word. The novel "Tian Ge", also known as "Dragon Legend", is the title of the book "Snow Mirror Moon Day."

Produced by the Harbin Jiancheng Group, ahe subsidiary of Norinco, a total of four models of Botes series were shown at the airshow, including Botes-100, Botes-250, Botes-500 and Botes-10000, (TG-100/250/500/1000) named after 100/250/500/1000 kg iron bombs used. The marketing of the LGBs suggested that the LT LGB upgrade conversion kit, as well as the bombs armed with such conversion upgrade kits, were both available for export. Some of the TG series have suffix ER in their names, such as TG250-ER, with ER being the English abbreviation for Extended Range, because the bomb also utilizes LS PGB kit for gliding.

Lei-Ting
LT-1 500 kg laser guided bomb
LT-2 500 kg laser guided bomb
LT-3500 kg laser and satellite guided bomb
GB-1 500 kg proportional navigation seeker design
Tian Ge / Tiange
TG-100100 kg 9th Zhuhai Airshow November 2012
TG-250250 kg extended range gliding laser guided bomb
TG-500500 kg 9th Zhuhai Airshow November 2012
TG-10001000 kg 9th Zhuhai Airshow November 2012
A picture taken in 1982 of a bomb-guided laser-guided bomb appeared on the Internet. Mounting an American-style guided bomb on a Soviet bomber gave a very strange feeling, and some people doubted whether the picture was true. of. The author believes that this picture may be a picture of the domestic 7712 laser-guided bomb test. This picture reveals the tip of the iceberg of the early development of laser-guided bombs in China. At present, China's laser-guided bombs have been equipped with troops in batches, and the technical level has reached or approached the world's advanced level. Even the use of laser-guided composite guided bombs has been developed, which has effectively improved the ground strike capability of our military aviation. In the eyes of ordinary people, it is very simple to throw a bomb to attack a ground target. It is almost a plane that can do it. In fact, the situation is quite the opposite of what we have seen. This process is very complicated, and we see it simple. It's just a simplification of complicated things. The author gives an example. The bomb will be affected by various factors during the launching process, such as the state of the carrier, the state of the bomb, the influence of the airflow and the wind during the flight, etc. The more complicated one is the influence of the wind. We know the wind. The changes are very complicated. The wind speed and wind direction will change with time, place and altitude. Especially at the low ground level, it is also affected by terrain and obstacles. It is more difficult to master the wind speed and direction. In the design of fire control system attack ground targets, people made the following assumptions about the wind factor: the influence of vertical wind is not considered; the wind speed and wind direction are not considered; the wind speed and wind direction do not change within the range of bomb placement. Although this simplified design reduces the difficulty of the development of the fire control system, sometimes only a simple sight can be used to bomb the ground target, but the disadvantage is that the accuracy is drastically reduced, because the bomb is flying in the air, it is still affected by the wind, thus Cause changes in state and heading, reducing the accuracy of hits. This is especially true when hitting a point or line target, so there is a case where attacking a target may involve dozens or even hundreds of bombs, which leads to an increase in the number of aircraft movements and an increase in the damage rate. The United States attacked the Qinghua Bridge in the Vietnam War, dispatched thousands of aircraft, fired nearly 1,000 ordinary bombs, and failed to completely destroy it. In this case, in order to improve the accuracy of the bomb's hit, it must be able to let the bomb know that it has deviated from the scheduled route and correct it. This is the guided bomb, and the most familiar one is the laser-guided bomb. The laser-guided bomb is a bomb with a laser-guided device that automatically guides the target. The range is long, the hit accuracy is high, the power is large, and it has strong anti-interference ability. When projecting, it uses the laser illuminator on the carrier to first illuminate the laser beam to the target. After being reflected by the target, it is received by the laser seeker mounted on the head of the bomb, and then photoelectrically converted to form an electrical signal, which is input into the bomb control cabin. Control the deflection of the bomb's rudder surface and direct the bomb to fly to the target. Compared with ordinary bombs, the laser-guided bombs can achieve a precision of less than 10 meters. The power is high. Due to the high accuracy of the hits, the power of laser-guided bombs is different from other bombs under the same weight. Most of the ground bombs are lasers. Guided bombs are the reason; the cost is relatively low, the laser-guided bombs use semi-active laser guidance, there is no active components, so the equipment and structure are relatively simple, and the technology is relatively mature, so the price is relatively low; the cost is cheaper, due to the laser-guided bomb The probability of hitting is much higher than that of ordinary bombs, so the same goal may require dozens or even hundreds of bombs, but a laser-guided bomb can solve the problem, thus reducing the number of aircraft trips and reducing the damage rate. It is very realistic that a modern combat aircraft often needs hundreds of millions of dollars. However, laser-guided bombs also have their own shortcomings. First of all, it requires the aircraft to illuminate the target for a long time, otherwise the bomb may be lost. This limits the maneuvering range of the aircraft and is easily attacked by the opponent. Therefore, modern combat aircraft often use high-altitude bombs and other modes of low-altitude illumination. There is also a poor anti-interference ability. Although the laser guidance system is well directional, it is easily interfered by various smokes, rains, etc. in the atmospheric transmission. Therefore, the all-weather combat capability and delivery distance of laser-guided bombs are greatly limited. This also affected the development of laser-guided bombs, so the 21st century laser-guided bombs gradually withdrew from the status of national guided bombs and gave way to guided bombs. However, the latter still does not reach the level of laser-guided bombs in terms of accuracy, so the two are still coexisting, and there is also a composite guided bomb with laser-guided guidance. From the current domestic and international data, there is no obvious standard for laser-guided bombs. Generally, it is divided according to the development of the laser-guided bombs of the American Gem Road series. The first generation is the Gem Road-1, which adopts the wind-guided guide. The lead-head, relay-type gas cabin machine, and the duck-type aerodynamic layout, that is, the control rudder is behind the main main wing, the structure is relatively simple, the tactical technical index is low, the delivery distance is close, and the multi-target attack capability is not available. Based on the actual experience of Paveway-1, the United States has developed Gem Road-2, which introduces a laser coding system into the laser guidance system, thereby improving the anti-jamming capability and multi-target combat capability of the guidance system. Wings, therefore, it is possible to use a larger wingspan of the wingspan, increase the lift-to-drag ratio of the full-elastic, increase the throwing distance, and use a large number of digital circuits and integrated circuits for the guidance and control system to improve the sensitivity and reliability of the seeker. The Indian LCA fighters are currently in mass production, and recently began to test the domestic laser-guided bombs, anti-runway bombs, Russian-made R73 air-to-air missiles, and R77 medium-range air-to-air missiles. For 30 years, the Indian LCA fighters have come to this step! The Indian LCA fighters are currently in mass production, and recently began to test the domestic laser-guided bombs, anti-runway bombs, Russian-made R73 air-to-air missiles, and R77 medium-range air-to-air missiles. For 30 years, the Indian LCA fighters have come to this step. Although the gem road has a significant improvement over the performance of the first generation, its shortcomings are also very obvious. First of all, it can only be placed in the middle and high altitude, and can not be placed at low altitude. Therefore, the carrier is easily exposed to the scope of the other air defense system, and the security is low. Secondly, its guidance precision is not high, and it does not have the ability to attack moving targets, and the delivery distance is long. Therefore, the third generation of the Paveway-3 appeared. Its biggest feature is to replace the original weathering type seeker with the gyro-stabilized seeker, which increases the working range and working distance of the guidance system and can be placed at low altitude. The accuracy is further improved. The fourth generation of the Paveway-4 further increased the launching distance. The actual combat experience gained by the United States in several local wars in the 1990s showed that the aircraft needed to deploy weapons at a height of 30 kilometers at a height of 10,000 meters, so the new generation of photoelectric pods The laser illumination distance is further increased, so the gemstone road is equipped with a gliding wing to support a longer range, and a GPS/INS guidance system is added for use in harsh weather conditions. As for the future development of the laser guidance system, it is possible A guided bomb equipped with a laser active radar will appear, allowing the bomb to have a higher accuracy of delivery and the ability to be left unattended after delivery. During the Vietnam War, China sent high-altitude artillery units to Vietnam to support the Vietnamese people in their fight against the United States. In the air defense operations, Chinas Aid Vietnam troops saw the excellent tactical technical performance of laser-guided bombs, and also obtained the Paveway-1 laser guidance on the battlefield. The wreckage of the bomb was analyzed and studied. The design idea, the conductor system, the working law and the action process were found out. The preliminary technical preparations for the development of laser-guided bombs in China were laid and laid the foundation. In 1977, the relevant departments officially approved the development of China's first generation of laser-guided bombs, and named the 7712 laser-guided bomb, which was later called Thunder-1 (LT-1). According to the relevant information, the 7712 laser-guided bomb is basically the same as the Paveway-1 in terms of overall layout and conductor system. It adopts the wind-marking laser seeker, which is composed of the front-end wind-marking laser positioner and the rear electronics. a cabin composition, wherein the wind-marking laser positioner is equipped with an optical system and a four-quadrant photodetector to complete the detection, recognition and capture of the laser signal, and form an angle between the target line of sight and the axis of the weathervane, and then Pass it to the control system, which controls the deflection of the rudder surface and eliminates the bomb trajectory deviation, allowing the bomb to hit the target accurately. The advantage of the wind vane seeker is that the structure is simple, the reliability is high, and the cost is low. However, its guiding law is speed tracking guidance. Under the condition of attacking the ground moving target and the ground wind speed, the guidance precision is poor, and the guidance is further. The system's anti-interference ability, sensitivity and other indicators are also low, which limits its scope of use, so we see that the current generation of laser guidance systems is basically no longer used. According to relevant information, the 7712 laser-guided bomb seeker has a laser capture distance of not less than 4 kilometers, a terminal guidance distance of not less than 3 kilometers, a field of view of 25 degrees, a laser system wavelength of 1.064 micrometers, a system placement height, and a horizontal placement. It is 900-7000 meters, when it is submerged: 1000-6000 meters, when it is placed on the upper side, it is 100-1000 meters, the bombing speed is 700-1200 kilometers, 7 hours, and the guidance precision (ground irradiation fixed target) is 5 meters. The bomb is 3.68 meters long, with a diameter of 0.377 meters and a weight of 490 kilograms. The development of the 7712 laser-guided bomb has been carried out in two stages: the development of the prototype machine and the development of the engineering prototype. The wind tunnel blow test of the wind head, the full-air blow test, the program-controlled bomb air test, the seeker sea surface pull test, and guidance A number of large-scale tests, such as head-to-air flight test and airdrop target test. In 1985, the 7712 laser-guided bomb was used for the first target test. Two projectiles were placed by the strong one, and the ground was irradiated with the target. Once successfully, the bomb successfully captured the laser signal in the air, and the seeker and control mechanism subsequently The corresponding action was carried out to achieve laser guidance, but the accuracy of the hit failed to meet the predetermined requirements. Due to the weak domestic economic technology and the reduction of national defense funds, the North China Industrial Company introduced the 7712 laser-guided bomb to the international market under the name of LT-1, looking for international partners to improve this. The type of laser-guided bomb, but failed to find the user, the relevant work ended. Therefore, the development of the 7712 laser-guided bomb was finally put on hold, and the design of the equipment was not designed. However, through the development of this type of laser-guided bomb, the scientific and technical personnel of China have mastered the principle and technology of the laser-guided bomb and obtained certain engineering experience. It laid the foundation for the development of a new generation of laser-guided bombs. In the 1990s, the disintegration of the Soviet Union, the international situation and the security environment of our country have undergone fundamental changes. Although the new Russians inherited most of the Soviet Unions military and defense industries, the national economy was devastated by the shock economic policy. The impact was particularly severe, military orders were reduced, foreign markets shrank, factories were underemployed, personnel were lost, and equipment was rapidly aging. Under this circumstance, Russia has to adopt a more open attitude in foreign military technical cooperation, so that it can stand firm in the fierce international market competition and spend this difficult period. In this context, relevant departments of our country have carried out fruitful cooperation with relevant Russian industries. According to the domestic weapons and equipment development plan and the shortage of domestic scientific research and industry, a large number of advanced technologies have been introduced to promote the development of domestic weapons and equipment. Includes laser guided bomb technology. According to reports from overseas media, China introduced the technology of the Russian KAB-500L laser-guided bomb, which was a laser-guided bomb developed by the Soviet Union in the 1970s. The technical level is comparable to that of the American Gem Road-1, using a weather-standard laser. The seeker and the relay steering gear are guided by the speed tracking guide. The length of the bomb is 3.68 meters, the diameter is 0.37 meters, the weight is 498 kilograms, the seeker works at 1.06 micrometers, and the capture distance for the laser signal is 4. km. According to the viewpoint of Chinese scientists and technicians, the technology of KAB-500L has a big gap with the advanced level at that time, and even there is a big gap compared with Gem Road-1. For example, the field of view of Gem Road-1 reaches 25 degrees, while KAB- The 500L is only 12.5 degrees, but the Soviet scientists have successfully improved the downwind characteristics of the wind head and the sensitivity of the seeker by a variety of technical means, ensuring the accuracy of the laser guided bomb, which also reflects the solid theoretical foundation of the Soviet Union. Strong engineering experience. The J-10 fighters were organized into assault formations, and at the same time, four laser-guided bombs were delivered to the ground targets to accurately strike the key targets.Data map: The J-10 fighters were compiled into a assault formation, and at the same time, four laser-guided bombs were delivered to the ground targets to accurately strike the key targets. What is special is that the KAB-500L uses a normal aerodynamic layout, that is, the control rudder is at the tail. The KAB-500L adopts 4 small exhibitions. The wings are arranged at the tail of the projectile, and the rear of the wing has a large rudder surface. The advantage of this layout is that the angle of attack of the rudder surface is small, the rudder surface is less loaded, and the hinge torque is smaller. Small, so the pitch control efficiency is high, but this layout will bring too much static stability, which has a great influence on the efficiency of the roll control, so four stabilizer wings are added to the head of the projectile. Since these wings are fixed, the influence on the undercut of the rear rudder surface is small, so the nonlinear problem of aerodynamic coupling is also small. On the whole, Soviet scientists used this design to better balance the stability and maneuverability of the KAB-500L laser-guided bomb. For laser-guided bombs, the first flight is stable. This is the basis and premise to improve the accuracy of the hit. Then it must have certain maneuverability so that the flight trajectory can be quickly adjusted. It also has an impact on the accuracy of the hit. The anti-stabilization surface will play a role. This role. In general, the anti-stabilization surface can improve the aerodynamic efficiency of the bomb without increasing the internal structure and layout of the bomb, and increase the lift-to-drag ratio. At the same time, the installation of the anti-stabilization surface can significantly reduce the static stability of the projectile and improve the maneuverability. Effectively balance the contradiction between bomb stability and maneuverability. In general, the anti-stabilization surface is installed on the head of the bomb, because it is far from the center of gravity of the bomb and can maximize its function. Through the absorption and digestion of KAB-500L technology, China has mastered this layout, so we have seen that our new generation of laser-guided bombs still use this layout. The localization of the KAB-500L laser-guided bomb was officially established in 1997. It was designed and finalized in 2004. The domestic number is the Thunder-type laser-guided bomb. It was publicly unveiled at the Zhuhai Air Show in 2006. Currently, it is widely equipped with the Chinese Air Force and Naval Air Force. Combat aircraft, such as the J-10, the JH-7A and the Qiang-5 aircraft, it and the domestic K/JDC-1 type day and night all-weather photoelectric aiming pod constitute the first generation of Chinese aviation first-night all-weather ground-to-ground precision strike system. The Golden Autumn Season was a multi-armed land and air joint military exercise held in the western plateau at an altitude of over 4,500 meters. This is the first time that the Chinese army had organized a multi-service integrated land-to-air combined military exercise in high-altitude and alpine regions under the conditions of informationization. At present, China has introduced domestically-made day and night all-weather photoelectric pods and laser-guided bombs to the international market. According to the Zhuhai Air Show, China's export-oriented WMD-7 photoelectric aiming pods are powered by forward-looking infrared detection systems, 000 cameras, and laser irradiation. The system and other devices are arbitrarily able to detect, identify and track ground targets in day and night conditions, and use laser systems to illuminate and measure targets, and guide laser-guided bombs or other weapons to accurately strike them. Equipping the WMD-7 pod can greatly improve the combat aircraft's ability to strike ground targets, especially small-scale targets. In the past, using a normal bomb to attack an active tank may require dozens of bombs. Now, after mounting the WMD-7 pod, It may only be necessary to have a laser-guided bomb to solve the problem. The technical parameters of the WMD-7 pod are: scanning orientation 150 degrees, pitch angle 10 degrees? 150 degrees, the infrared system works in the 3?5 micron band, with two fields of view - 4.3 x 5.8 degrees for search targets and 1.4 x 1.9 degrees for locking targets, and up to 20 kilometers of detection range for ground targets CCD is mainly used for detecting ground targets under sunny weather conditions. It can provide more than 20 kilometers of detection distance for small ground moving targets. The laser system works at 1.06 microns, the maximum distance is 18 kilometers, and the illumination distance is 12 kilometers. about. From various tactical indicators, the WMD-7 photoelectric pod is equivalent to the AN/AAQ-14 photoelectric aiming pod of the LANTRIN system of the US system. The latter also includes an AN/AAQ-13 day and night all-weather low-altitude navigation pod. Terrain tracking radar, wide-field navigation forward-looking infrared detection system, China also has a similar pod, that is, the blue sky is low all weather. Air navigation pod, its tactical technical indicators are comparable to AAQ-13, but considering the sensitivity of the blue sky pod, China may export this pod when exporting, in fact, the United States does not export the full version of the system, Saudi F-15S is equipped with a simplified version of the system. The new LT-3 penetrating laser-guided bomb produced in the China Aviation Exhibition Hall of Zhuhai Air Show was once again unveiled. The bomb was on display with the LT-2 500 kg laser-guided bomb. The LT-3 penetrating laser-guided bomb adopts GPS/INS+ laser composite guidance method. The impact accuracy is very high up to 3 meters, the maximum launch distance is 24 kilometers, and it can penetrate 1.5 meters of reinforced concrete obstacles. Data Map: The new domestic LT-3 penetrating laser-guided bomb in the China Aviation Exhibition Hall of Zhuhai Air Show was once again unveiled. The bomb was on display with the LT-2 500 kg laser-guided bomb. The LT-3 penetrating laser-guided bomb adopts GPS/INS+ laser composite guidance method. The impact accuracy is very high up to 3 meters, the maximum launch distance is 24 kilometers, and it can penetrate 1.5 meters of reinforced concrete obstacles. Although the LT-2 laser-guided bomb and the photoelectric aiming pod have solved the problem of the Chinese Air Force's accurate attack on the weather all day and night, it has filled the domestic gap, but its tactical technical indicators are still far from the world advanced level. It has been said that the LT-2 is only equivalent to the first generation of the US Paveway-1 in the technical level. Therefore, the latter also has problems. For example, the low-altitude delivery capability is low, and it can only be bombed at medium and high altitudes, and it is easy to expose the attack intention. The counterattack of the other party, the gliding distance is short, the launching distance is only about 10 kilometers, and it is impossible to project bombs outside the defense zone, and the guidance precision is not high, and it cannot be used under large wind speed conditions, and cannot attack the maneuvering target, which limits its use range and Combat flexibility. Therefore, for our country, both the troops and the export need more advanced laser-guided bombs to improve the combat effectiveness of the troops and their competitiveness in the international market. At the 2012 Zhuhai Air Show, Harbin in China was built to display the Tian Ge series of laser-guided bombs. The most exciting thing is that the Tian Ge series of laser-guided bombs have no wind heads, which indicates that it uses a gyro-stabilized seeker, the proportion Guided control system, the overall tactical technical indicators have reached or approached the level of the US Gem Road-3, thus indicating that China has taken a big step forward in laser guided weapons. The so-called proportional guidance method is that in the process of the guided weapon flying toward the target, the weapon speed vector rotational angular velocity (the angular velocity of the ballistic inclination in the vertical plane, the angular velocity of the ballistic declination in the horizontal plane) is proportional to the target angular velocity of the target. Thereby, the guidance precision of the system is greatly improved and the trajectory with the falling angle requirement can be realized. In order to cooperate with the new guidance method, the Tiange laser-guided bomb uses a gyro-stabilized seeker, and its seeker includes an optical system, a four-quadrant photodetector, a preamplifier and pre-processing circuit, a frame structure, a servo mechanism, and The angle measuring system and the gyro stability system, the electronic cabin includes an amplifying circuit, a sample and hold circuit, a digital signal processing machine, an interface circuit, a gyro stable driving and a control circuit. The laser echo signal reflected by the target is collected by the optical system and concentrated on the photosensitive surface of the four-quadrant photodetector. After photoelectric conversion, four channels of electrical signals are obtained. After the four-channel mesh is processed by information, the laser is processed on one hand. The pulse is detected and recognized to form the target capture signal and the gate signal. On the other hand, the four signals of the target are subjected to difference processing, and an angular error signal of the angle between the target line of sight and the optical axis in the pitch and azimuth is obtained. The angular error signal is used to form the driving command in the pitch and azimuth directions on the one hand, so that the seeker tracks the target accordingly, and on the other hand forms a guidance control command to let the weapon fly to the target according to a certain guiding law. After adopting the new guidance system, the precision of hitting the Tiange laser-guided bomb is greatly improved. Take the 500-kilogram laser-guided bomb as an example. If the ground-attack air attack tactics are used, its accuracy can be improved to about 3 meters. Using airborne air attack methods, the guidance accuracy can reach 5 meters. Due to the improvement of the performance of the guidance system, the scope of application of the laser guidance system in China has expanded, and the varieties of related systems have also been improved. At the 2012 Zhuhai Air Show, the completed group exhibited 100 kg, 250 kg, 500 kg and 1000 kg class laser-guided bombs of different specifications are equipped with different tactical carriers to combat different targets, such as 100 kg class can be equipped with light attack aircraft, unmanned attack aircraft, perform surgical strikes, and 1000 kg class can be equipped with heavy duty Attack the aircraft and attack the ground or the ground to a solid target. It should be pointed out that the advancement of the guidance system has also increased the distance of the bomb. From the related pictures and information, the Tiange series laser-guided bomb adopts the extended range design, which means that it increases the delivery distance and thus improves the carrier. Survival on the battlefield. We know that the early field air defense systems such as small and medium caliber anti-aircraft guns and portable air defense missiles have relatively close range. The Russian ZSU-23 four-tube 23mm self-propelled anti-aircraft gun has a range of about 4 kilometers on the air target. According to our army, it Conduct an assessment to improve the survivability of the aircraft on the battlefield. We know that the early field air defense systems such as small and medium caliber anti-aircraft guns and portable air defense missiles are relatively close. The Russian ZSU-23 four-tube 23mm self-propelled anti-aircraft gun has a range of about 4 kilometers for the air target. The assessment, if the attack aircraft is striking at 800 meters per hour at a height of 1000 meters, the ZSU-23 shoots with a long shot (4x25 points), even if the caliber is 2 km, its hit probability drops to 20%, even 35mm high-altitude guns can only maintain a good probability of hitting around 4 kilometers, and the first generation of portable air defense missiles have limited range due to low sensitivity and weak anti-interference ability of infrared devices. Portable air defense missiles such as the early SA-7 and drug lords are only about 4 kilometers away from the jet collision. Even some large air defense systems, such as the wasp self-defense system, launch 9K33 air defense missiles. At that time, the range was only 8 kilometers, so the early laser-guided bombs were placed at a distance of about 10 kilometers to achieve an off-site strike against ground targets. In the 21st century, the range of the field air defense system has been greatly developed. Even with the light air defense system, its range has made great progress. The "Tongguska" artillery combined air defense system launched the 9M311 missile, and the range has reached 8,000. Meters, while the latest 5726 missile has a range of 20 kilometers, so that the ground field air defense system can already attack the laser-guided bomb before it is loaded, while the combat aircraft is mounting the laser-guided bomb. Due to the increase in weight and resistance, poor maneuverability and low survivability, a new generation of laser-guided bombs needs to be deployed farther to improve the viability of the aircraft. We know that for air-to-ground weapons such as unpowered bombs, the launch distance is equal to the height-to-elevation ratio. According to the experience of several US local wars in the 1990s, combat aircraft are at a height of 6,000 meters and 20 kilometers away. Throwing laser-guided bombs can guarantee their own safety, but the higher the height, the farther the distance is, and the target recognition ability will also increase. This has led to the generation of new-generation photoelectric aiming pods in the United States and Europe to support the launch of laser-guided bombs. Including the United States ATFLIR photoelectric pods, sniper photoelectric pods and France's Damocris photoelectric pods. The GB series of precision-guided bombs developed by Northern Industries was unveiled for the first time. As a gliding guided bomb, it is efficient and low-cost, and is used for precise impact on fixed targets on the ground, such as airports, seaport bridges, command centers, etc. Data Sheet: The GB series of precision-guided bombs developed by Northern Industries was unveiled for the first time. As a gliding guided bomb, it is efficient and low-cost, and is used for precise impact on fixed targets on the ground, such as airports, seaport bridges, command centers, etc. The biggest feature of these pods is the use of the third generation of large-area infrared arrays, such as the 640x480 array, which can detect targets from farther places. For example, the detection distance of the ATFLIR pods to ground targets can reach more than 50 kilometers. Ideally, it can exceed 80 kilometers, using a higher resolution CCD camera. The forward-looking infrared detection has a complementary range of effects. They can not only aim and evaluate combat damage at high resolution during daytime and sunny days, but also At dusk and dawn, when the forward infrared does not work, and to some extent penetrate the camouflage of the leaves, the CCD of the new generation photoelectric pod can provide a detection distance of more than 30 kilometers for a target with a diameter of 10 meters. The target of 30 meters can reach about 100 kilometers. Laser devices have begun to use high-power pumped diode lasers with the ability to target intercept and project weapons from greater distances outside the zone. In addition to conveying information directly to the fire control system, they can also work with laser illuminators used by ground forces or mounted on other aircraft. For example, the laser device of the French Damocles pod is said to be 10,000. The height above the meter reaches a working distance of 45 meters. According to relevant reports, China has begun to adopt the third-generation 612x480 photoelectric pods, and large-area CCD cameras and high-power laser devices have also been successfully developed. These have laid a solid foundation for the development of a new generation of photoelectric aiming pods in China. It provides a prerequisite for increasing the distance of laser guided bombs in China, so we have seen that the Tiange laser-guided bombs at the Zhuhai Air Show have generally increased the launch distance. From the relevant data, the launching distance of the Tian Ge series of laser-guided bombs is generally more than 20 kilometers, and it has the ability to conduct an out-of-zone attack on the new generation of field air defense systems. As mentioned above, the laser-guided bomb increases the throwing distance. In addition to increasing the height of the launch, it also increases the lift-to-drag ratio of the system. However, the shape of the bomb is conical. According to Bernoulli's theorem, the object of this shape has very low lift. The main lift contribution comes from the wing. We know that lift is directly proportional to the area of ??the wing, so the best way to increase the lift of the bomb is to increase the area of ??the wing. From the related pictures, the wing area of ??the Tianke 500kg laser-guided bomb seems to have increased, which increases the lift of the system and increases the lift-to-drag ratio. However, there is a disadvantage in increasing the area of ??the wing, which is to increase the system's Resistance, we know that the speed of the bomb in the air is low, the resistance is mainly induced resistance, the induced resistance is related to the aspect ratio, and the aspect ratio is equal to the square of the wingspan divided by the area of ??the wing, that is to say if the bomb is increased If the wing area does not increase the wingspan, then the aspect ratio will be lowered. The lower the aspect ratio, the greater the induced resistance, which is not conducive to the increase of the lift-to-drag ratio. GB series precision guided bombData Sheet: GB Series Precision Guided Bomb On the Tian Ge 250 kg laser-guided bomb, we see the opposite approach. Its wing area is reduced, so that although the lift is reduced, the aspect ratio is increased, the induced drag is reduced, and the lift is improved. Increase, its delivery distance will not fall, but it can still reach 20 kilometers. Of course, the reduction of the wing area will lead to the reduction of the rudder area, which is not conducive to the control of the bomb and will reduce the maneuverability of the bomb. At this point, the reader may understand that for the bomb, the most obvious wing to increase the launch distance is the long-shaped wing, which can increase the lift and reduce the induced drag, thus obtaining a better lift-to-drag ratio. However, the bomb was mounted on the plane and limited by the space on which the aircraft was mounted. The size of the wing, especially the wingspan, should not be too large, so we saw the shrinkable wing design on the Tiango 100 kg laser-guided bomb. A telescopic long-shaped wing is embedded in the main wing. When the aircraft is mounted, the long-shaped wing is included in the main wing. After the launch, the long-shaped wing is extended to increase the wingspan. This can increase the aspect ratio, reduce the induced drag, and increase the distance of the shot. According to Zhuhai Air Show, Tian Ge's 100-kilogram laser-guided bomb can reach a distance of 30 kilometers. The effect of this is still quite obvious. However, there are limitations to this approach, that is, the length of the wing is still limited, so that the aspect ratio of the wing cannot be increased too much, and the lift-to-drag ratio of the whole missile is directly related to the aspect ratio. According to domestic and foreign experience, When the aspect ratio is increased from 2 to 10, the full-bomb lift-resistance ratio can be increased by 3 times, and the range can be increased by about 3 times. The effect is still very obvious, so a new generation of laser-guided bombs such as the Paveway adopts long-range gliding. The wing is used to increase its launch distance, and the built-up group also exhibited a 250 kg gliding extended range laser-guided bomb, which has a distance of 80 kilometers. From this indicator, the author believes that the built group is 250 kg. The gliding extended range laser-guided bomb should be the same as the Paveway-4, using GPS/INS and laser guided dual-mode guidance. We know that the laser is transported close to the atmosphere. This is because the dust, smoke and the like in the atmosphere absorb the energy of the laser. This is also a big disadvantage of the laser. We see that the laser guided weapon is generally closer. As mentioned earlier, even the third-generation photoelectric pods are difficult to reach more than 50 kilometers at an altitude of 10,000 meters, so the 250 kg gliding extended-range laser-guided bombs built by the company can hardly reach 80 kilometers by laser guidance alone. Distance, so I speculate that it should be the same as Paveway-4, using GPS / INS and laser guided dual-mode guidance. Relevant units in China have exhibited Thunder-type GPS/INS and laser-guided dual-mode guided bombs at the Zhuhai Air Show, marking that China has mastered this technology, so the companys 250-kilogram gliding extended-range laser-guided bomb uses this technology. There are no obstacles. With this dual-mode guidance system, the company's 250-kilogram gliding extended range guided bombs have greater operational range and flexibility. For example, after the bomb is released, the pilot can select the guidance system according to the battlefield situation. If the smoke on the battlefield is large and the performance of the laser guidance system is degraded, then the guidance system can be selected, or the target can be used to extend the range. Mode to combat long-range targets; if high-precision targets are needed to reduce additional damage, then laser guidance mode is selected to improve the accuracy of the strike. This flexibility is clearly unmatched by ordinary GPS/INS guided bombs or laser-guided bombs. Throughout the development of China's laser-guided bombs, it can be said that it has taken a road of integrating things from the west to the east, and finally developed a space-precision guided weapon with its own characteristics. It can be said that it is the epitome of the country's development path. With the improvement of economic strength, Chinas precision-guided weapons will be even stronger.




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