Super Thunder - An Analysis of the Pakistan Air Force JF-17BLOCK2 fighter (2011-07-09 22:09:06)Reproduced the original
Original Address: Super Thunder - An Analysis of the Pakistan Air Force JF-17BLOCK2 fighter
Recently, the news from Pakistan said China will "emergency" to the Palestinian side 50 JF-17 combat aircraft type, these aircraft will be increased to the standard batch of JF-17BLOCK2, its combat capability of JF-17BLOCK1 compared with existing greatly improved. JF-17BLOCK2 will be active PAF JF-17's standard.
From the information point of view, JF-17BLOCK2 will continue to use our on-board avionics systems and weapons, and continue to improve the depth and breadth of the combat aircraft performance, and PAF are imported form China ZDK-03 early warning aircraft and more stringent complete air system in order to improve the combat capability of the PAF autonomy.
In the JF-17BLOCK2 the message, the outside world for the first time to know the SD-10B active radar guided air to air missiles, the existence of the Palestinian side that the SD-10B's performance can be introduced with AIM-120 air to air missiles, compared, and in weight than the existing The SD-10 to lighter, from the air show public view, China's SD-10 air to air missile a maximum range of over 70 km, the effective range of 50 km, and AIM-120A is similar to the latter's maximum range of more than 80 km, the effective range of 55 km, but the SD-10's size and weight must be greater than AIM-120A, so that for the JF-17 light fighter, the mount SD-10, on the flight performance impact is too large, in particular, mounted on the outer wing pylons, you need to reach launchers to adjust the focus of the new century from the U.S. introduction of F-16C/D-BLOCK52 PAF fighter, equipped with the above AIM-120C5, the 1990 Taking into account the U.S. Navy's AIM-54 "Phoenix" the long-range air to air missiles, retired, the successor of advanced air to air missile-AAAM plan is terminated, the U.S. Navy for long-range air strike capability targets a substantial decline, as a quick supplement to the U.S. Navy requires AIM-120 can intercept distance of more than 40 miles (60 kilometers) of air targets, this is the AIM-120C5, compared with the prototype missile, the missile to increase the weight of the missile engines, increased from 45 kg to 50 kg, while improving the grain's surface, so that more regular and full combustion, increasing the time and fuel specific impulse, so that AIM-120C5 missile interceptor prototype increases range from about 10%, while improving the guidance Head of the signal / data processing capacity, increasing the number of warhead fragments, and comprehensively improve the three generations of the twin's ability to destroy aircraft, the improved AIM-120C5 and AIM-120C7 continue to increase the rocket engine, its effective range has been further increase from Pakistan's point of view of information sources the performance of SD-10B may be in line towards the AIM-120C5, in improving the range, based on the reduced size and weight, to improve the adaptability of loading, I think it is very important is the possibility of SD-10B also taking into account China's stealth fighter being developed for weaponry, stealth fighter jets to reduce the RCS, airborne weapons are generally placed above the bomb bay, in order to narrow as much as possible inside the bomb bay mounted weapons , so it is necessary to reduce the air to air missile system, AIM-120C than the AIM-120A on the reduction of the tip, to improve the F-22's bomb bay to mount the number, SD-10B may also be the idea, with a range of improved, guided accuracy of the system have to keep up, SD-10B is said with a surprisingly active / passive complex guidance system, with the guidance we are familiar with the source of interference in different ways, this active / passive composite guidance is to use passive mode other airborne radar signal receiver, and then start using the former terminal guidance radar target data to improve detection, both work to improve the seeker detection range and interference, be pointed out that SD-10B does not plan to adopt This guidance system of air to air missiles, AIM-120 also have had such a plan, but the technical difficulty of this seeker of the great need to address the broadband active / passive antenna and radome composite guidance, data fusion series of key technologies Therefore the author for the SD-10B is equipped with guidance systems such reservations, but we seem to speculate about our range air to air missiles in the direction of development.
Improve the performance of air to air missiles, airborne fire control radar, a necessary requirement to be followed to improve the performance, because the latter need to provide air to air missiles to attack the target zone data to calculate, JF-17BLOCK2 with SD-10B-air missiles, which means that the China should be equipped with airborne radar, this is because an aircraft using a weapon, you will need the associated computer program resides in the task or the fire control computer, and these procedures are based on the missile launch envelope preparation , while the missile launch envelope is the core countries of airborne weapons secrets, related to the work of the missile terminal guidance radar tracking distance and angle and the maximum tracking speed, time, energy work on the bomb, the engine thrust and working hours, definitely not will be exposed, so the JF-17BLOCK2 task is basically a computer can be sure that our products, as stated earlier airborne radar to detect the target, it will smooth the data and make forecasts, then the data to the mission computer for processing by the post manipulation of instructions to complete the aircraft, missile attack area, the calculation of the radar scan parameters, clearly would involve airborne radar-related parameters, which is also confidential, so I thus believe that the JF-17BLOCK2 still use our avionics system . In fact JF-17BLOL01 avionics system is quite advanced, more than the existing third-generation combat aircraft, the third generation of combat aircraft is equipped with joint-type avionics systems is the use of the system data bus linked to the core mission computer systems, the task computer responsible for processing the detection system to obtain information, and then submitted to a unified display and control a computer display, and the JF-17 avionics system for the management of weapons control computer as the core, its greatest feature is the combination of two computer tasks and display control functions , thereby reducing system complexity and simplify the structure, reducing weight, improving the overall avionics system reliability but also for future upgrades to lay a solid foundation.
In Pakistan for the description of the aircraft radar, there is a word the reader may feel strange; "will be rotating disk with active phased array radar," in many people's minds airborne phased array radar antenna should be fixed and why the JF-17BLOCK2 the AESA with this thing? I thought it might be to expand the scope of the radar scan, phased array radar has a drawback, as the scanning range increases, the radar aperture projection area decreases, resulting in lower gain antenna and beam increases, thereby reducing the radar detection distance, so the need to rotate the radar antenna to extend the scanning range, we are familiar, such as F-22 fighter AESA, etc. The reason is fixed, because these fighter AESA of a higher power, wide-angle scanning can tolerate a certain gain loss, and a light aircraft as the radar power is limited, this loss can not be ignored, with the same level of JF-17 JAS-39 fighter, equipped with the AESA is said to be rotating body to increase the radar's scanning range. There is also a mechanical scanning mechanism of airborne phased array radar is more familiar BARS passive phased array radar-PESA, the radar with the Indian Air Force Su-30MKI fighter jets above, some people often take the Su-30MKI and China's Air Force Su-30MKK comparison, BARS is necessary to mention a project, but the official website NIIP is relatively conservative given the data; BARS electronic scanning angle is 40 degrees lower than conventional aircraft fire control radar, scanning the range of 60 degrees the need to further expand the machinery sector, radar detection range fighter-sized target at 130-140 km, these data clearly BARS radar antenna, the 1-meter diameter and 5KW peak does not match, I believe that in fact the same two reasons of, BARS is PESA, compared with the AESA, the radar antenna is relatively simple, the cost is low, but the disadvantage is the complexity of the radar feed, the transmitter power to go through circulation control, power distribution networks to reach each element, in which Obviously there will be a large power loss, that is, despite the large BARS antenna and power, but because a larger loss of the antenna radiated energy is not high, so that when the scanning angle is large, this loss plus the antenna gain down, it will reduce the radar detection performance, in this case, had to be supplemented by mechanical scanning mechanism, as heavy phased array antenna, the target data update rate is not too high, while the overall weight and resulting in radar systems volume increase, BARS weight over 500 kg. This is why the Indian Air Force to BARS AESA upgrade to the root cause.
JAS-39 equipped with AESA, pay attention to the radar antenna is movable, JF-17's AESA with similar estimates
According to the China Import and Export Corporation to provide information, present with the JF-17BLOCK1 airborne China KLJ-7 radar-based fire control radar, the radar antenna diameter of 600 mm or so, the next, as detection range of 80 km, the apparent 105 km or so. Plane distance of 120 km search, and KLJ-7 also has a more comprehensive open space (sea work) mode, including the accuracy of synthetic aperture imaging and ground moving target indication mode, but the effective range of indicators to support distant SD -10B is still a reluctance, particularly mechanical scanning radar target update rate is low, less able to multi-target attacks in the implementation of open space mode, can not be simultaneously empty pattern, which are inferior to PAF, it is very unfavorable. If the dress AESA, which you can use a larger power aperture product to improve the radar detection range, but may also increase the degree of JF-17 is limited by the power supply and cooling system capacity, but rely on agile AESA electronic scanning capabilities, JF-17 radar can be the main focus of the energy concentrated on the direction of the threat or to provide a detection range of the tracking accuracy, or the rapid implementation of multiple target detection and tracking, and execution time when the implementation of the open space model of the empty model, particularly its a good multi-target tracking to provide reliable performance for the PAF's ability to attack multiple targets in the BVR process of multi-target attack, airborne radar speed search mode after completion of the target detection, track-mode into the side of the search target tracking, multi-target tracking algorithm after processing the data obtained after the target, then to the mission computer for data processing. From the experience of modern air combat, air combat of the war the next intersection shorter time, the pilot in an attack as much as possible to attack multiple targets in order to improve the ability to hit the target. This is common dress of modern fighter AESA radar guided air to air missiles and active the main reason.
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