KLJ-7A
KLJ-7A: PROPOSED AESA RADAR FOR JF-17 UNDERGOING TESTS | Quwa
"CCTV News footage shows that the Nanjing Research Institute of Electronics Technology (NRIET) KLJ-7A is undergoing tests with the China Flight Test Establishment’s 711 unit..
In comparison to current-generation mechanically-steered radars, AESA radars provide key defensibility gains against electronic warfare (EW) jamming and enemy radar detection. Instead of relying on a single array that transmits a different frequency per-single-pulse, AESA radars utilize many arrays – i.e. transmit and receive modules (TRM) – that can each transmit in a different frequency. In unison, these TRMs enable a single AESA radar unit to transmit in different frequencies simultaneously.
East Pendulum was informed by NRIET deputy director Wang Hongzhe that the KLJ-7A has a range of 170 km, though it is unclear if this is against 5m² RCS (radar cross-section) or 3m² RCS targets. It can track 15 targets and engage four simultaneously. Though equipped with 1,000 TRMs, it is not known if the KLJ-7A’s TRMs are built from gallium arsenide (GaA) or gallium nitride (GaN)."
KLJ-7A AESA radar has 1,000 transmit/receive modules (TRM). This means it is equivalent to the F-16 Block 60 AESA radar in the number of transmit/receive modules.
Recently CCTV showed the footage on
a special theme titled “‘China’s magic weapons’ for export: Secret in seeing
hundreds of miles away”, focusing on description of many types of new radar
developed by the 14th Research Institute of China Electronics Technology Group
Corporation. The functions of its radar include those for aircraft fire
control, AEW&C, air and missile defense and detection of artillery location,
etc. used on China’s homegrown aircraft carriers, Chinese Aegis warships,
anti-stealth radar, etc. Some of their export versions have sustained the tests
of real war abroad.
It first describes the
KLJ-7A active phased array radar used on FC-1/JF-17 fighter jet with a range of
170km.
According to a military
expert who would rather remains anonymous, the radar is in the main equivalent
to that used by F-35.
"Fierce Dragon" BLOCK3
December 28 published "China Aviation News" published an article "for you, thousands of times," reported the beginning of the aviation industry in Chengdu in October from the "Xiaolong" third batch (BLOCK3) preliminary design work to Some progress. "Fierce Dragon" is a fighter jet development project jointly carried out by China and Pakistan. According to the information disclosed by Pakistan, the aircraft will use advanced active phased array radar to become another new card in China's aviation industry in the international market .
Pakistani Air Force equipment "Fierce Dragon" fighter
"Fierce Dragon" BLOCK3 may use a similar F-10B \ C head design to accommodate the new loop control system
The report mentioned that by the end of October 2017, the blockbuster joint development of China-Pakistan Fighter Dragon "block3, which attracted worldwide attention, ushered in a new major node - into the preliminary design stage.
The first task in the preliminary design stage was zoning coordination, which said in the report that "this is an important part of the preliminary design of the aircraft." How to draw the top-down design of each system and organic integration of each system on the aircraft Comprehensive, the formation of the overall optimal ability is the new connotation and the key to the coordination of zoning. "
Military aircraft, the time window is very valuable, fleeting. Therefore, Chengdu actively planned that under the organization of party chief Tan Xin and model chief Yuan Bing, the headquarters of the general department quickly set up the "Xiaolong" three batches of coordinating member commandos with the chief coordinators as the backbone.
With the strong support of fraternal professionals, over 90% of the coordination projects were completed in the first month, creating a new speed for model zoning coordination.
According to the report, "Different countries and different users have different understandings, needs and understandings of aircraft. Based on the suggestions made by users based on many years' trial experience, relevant experts in zoning coordination team visited the ground handling brigade of the aerospace industrial test flight station In-depth exchange of aircraft maintenance issues, access to first-hand information. Collection of up to hundreds of issues.
The report mentions that "the mayor is the key position for the coordination of zoning work." This sub-district coordination is a brand-new one and facing such thorny problems as the center of gravity and the lack of design input by foreign products. The theoretical basis and a good sense of engineering, in the design of various factors in advance to consider various uncertainties, high-quality completed a district work. A program before will learn more about other types of practices as well as three batches of aircraft related system principles program, from the whole machine analysis of the pros and cons of weighing, and then gives a detailed overall program. Meticulous work attitude and style, so that the relevant professional trust.
"Fierce Dragon" partition coordination work results, Fierce Dragon full-size model
The first flight of the prototype Xiaolong 01 is basically in accordance with the technical status of the full-size frozen model made
"As the design of the top input, customer demand is always changing. Sometimes a change in demand, will lead to a series of professional design changes involved. Just as the cockpit ventilation difficult to change the coordination of the direction, in many research Captain Wang Wei has failed to give up after the failure of the design has put forward new ideas in the design has been completed, the control, structure, strength of the professional face to overthrow the situation, without complaint, and actively cooperate .Zhao Suzhu, He Shuai, Wen Xiaoning and others are experienced "old" district governors coordinated by seven model divisions.All the details of the design of the aircraft, and even the location of the rivets, they are carefully considered to prevent subsequent manufacturing and use of the problem.Emitter installation, According to the initial design of the aircraft drum kits, Ho Shuai and finished products factory together, repeated attempts to optimize the structure of the finished product structure, in order to 2 mm height, they carried out a full day of fine design, eventually removed the bulge.
Fierce Dragon BLOCK2 fighter jet is mainly equipped with air refueling tube to solve the Pakistan Air Force that "Fierce Dragon" shorter flight
At the Pakistani side's request, China has also designed and developed a two-seater JF-Jet to meet the Pakistani Air Force's demand for the same type of trainer and the potential users to experience the sky
Observer Network military commentator said that in our aircraft design work methods, "zoning coordination" is part of the project development stage, "zoning" refers to the various parts of the aircraft design considerations, such as some taxonomies have "lightning Zoning "is mainly responsible for aircraft lightning protection design; and some classification rules are divided according to the different sections of the aircraft, such as civil aircraft design" cabin partition ", it is mainly part of the cabin design team. "Coordination" means that the team is responsible for all the different parts of the aircraft design team, each request, and compromise with each other, to avoid the situation of loss.
Being able to carry out "zoning coordination" means that the main design requirements of the aircraft, the major equipment chosen are broadly defined, and the basic design materials that can be "coordinated" can be found in all divisions.
In addition to the drawings and documents, the results of the district coordination work will generally be followed by the manufacture of a prototype for coordination and some tests. After all the preliminary design work is completed, the state of the technology can be frozen and the detailed design stage can be completed.
According to previous reports on the development of China's fighter aircraft, it was mentioned that "Fierce Dragon" fighter under the auspices of Yang Wei, from the beginning of 2001, only 4 months to complete the design adjustment, the whole set of regional coordination, the whole machine Coordination of prototype transformation, equipment, pipelines, cable installation coordination, structure, system key test and other major node tasks, has been highly praised by users. In November that year to complete the state of the frozen technology, into the detailed design stage.
With the development of "Fierce Dragon" and "Fierce Dragon" BLOCK2 experience, "Fierce Dragon" BLOCK3 development process is not believed to be slower than the original "Fierce Dragon".
Mentioned in the report, "Fierce Dragon" BLOCK3 fighter partition coordination encountered many problems about the first half of the plane, such as "center of gravity ahead of" from the Pakistani side mentioned the news, it should be because of the new active Phased array radar weight, resulting in the whole center of gravity has been more than the original "Fierce Dragon" fighter design of the first set the focus of the most restrictive, and therefore need to adjust the overall layout of the aircraft and flight control.
Earlier, some news pointed out that the "Xiaolong BLCOK3" radar will be selected among the products provided by two Chinese enterprises. Air-cooled active phased array radar proposed by Institute of Aeronautics and Astronautics 607 Research Center once propagated the key point is that it can be retrofitted without modification.
If you follow this statement, then the "Fushun" BLOCK3 This issue may mean that the aircraft used by the China Electronics Technology Group 14 Institute developed KLJ-7A-type active phased array radar, which uses liquid-cooled System, in order to install this system, the need for more substantial adjustments to the front fuselage. Prior to the F-10B, C fighter development process, there are also reports that the installation of active phased array radar, involving the front fuselage redesign, widening the head of the problem. In this article, it is mentioned that "the control, structure and intensity professionals face the overthrow of the rebranding" refers to the problems in this respect.
Of course, it can not be ruled out that the 607 radar, although not required to retrofit a liquid-cooled system, weighs more heavily than the original KLJ-7 radar and therefore requires a partial redesign. This seems to be the article referred to and involves multiple partitions, almost completely re-design of the front fuselage is not consistent, if so, to modify the design is relatively simple, directly at the tail plus some weight will be able to solve the problem ...
As for the article mentioned in the "lack of design input of foreign products," Pakistani should be referring to the "Fushulon BLCOK3" to select part of the Western standard equipment, which is the "Fierce Dragon" design beginning of the phenomenon, Because the Pakistani Air Force is equipped with both F-16s and Fierce Dragon Fighters, in order to simplify logistics, some of the equipment needs to select American standard products. For example, the ejection chairs use the products of the British Martin Beck, and it is naturally impossible for Chengdu to find the relevant manufacturers in the United States and Britain Coordination, it can only be based on the relevant product thoroughly, leaving a margin in the design. In fact, this is also a familiar practice in the design of China's foreign trade fighter. There is nothing to be wondered about.
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