JH-7A [Jianhong Fighter-Bomber] - Design
The JH-7A is an improved version of the JH-7. The machine is designed by 603 and produced by Xifei Company. The JH-7A was established in 1997 and was equipped with air force units in 2005.
After the pre-production mass-produced JH-7 equipment unit was commissioned in 1992, it continued to participate in the package. Coastal exercises included the Taiwan Strait exercises. On the basis of extensive consultation with the use of the troops, the development unit began to carry out the improvement in 1995 - the design work of the JH-7A.
The JH-7A deleted the wing knives on the wing of the shape, and adopted the all- composite flat tail developed by Beijing Aeronautical Manufacturing Engineering Research Institute , which simplifies the process difficulty and cost of the flat tail, and doubles the weight loss, strength and life; The H-7A improved titanium alloy super plastically formed double pelvic fins have made the aircraft's stability and load distribution properly adjusted. Optimize the flat tail weight form to improve the flutter characteristics of the flat tail; improve its bearing capacity and flutter critical speed , and reduce the vibration effect. The original goal of weight reduction of 20% is increased to 24%. Switch to the overall arc windshield. The front edge of the vertical tail is changed to an aramid composite. After a total of 35 new materials, new processes, and new technology improvements, the JH-7A empty weight was reduced by 400 kg, the maximum takeoff weight increased by 10%, and the range increased. Increased reliability and maintainability. There are topical application of stealth coatings.
The JH-7A's integrated avionics system is a comprehensive, digital, multi-functional electronic fire control system with high reliability and good maintainability and expandability. The system has all-weather autonomous and non-autonomous navigation, combat management and system integrated display and control management. In conjunction with related systems, it also has the functions of launching precision guided weapons, anti-regional attacks and anti-radiation attacks all day and night.
The JH-7A replaced the original 232H fire control radar with the domestic JL-10A pulse Doppler radar. Compared with the latter, the JL-10A has a great progress in detecting distance and function, especially with terrain following, Doppler. Sharpening and other ground modes can better support the long-range strike mission of the JH-7A. Due to the increase of equipment and functions, the comprehensive avionics system of the JH-7A using a number of 1553B data bus, the core is the task computer, compared with the JH-7 fire control computer, its computing speed is higher, the capacity is larger, can support more functions and weapons, its functions include: system Task data management, navigation calculations, weapon aiming calculations and weapon launch control, flat display and display driver in the rear of the rear cabin.
This is very important for the JH-7A, because only the mission computer can support the use of more weapons, so that the JH-7A can perform more combat missions, so the military combat aircraft has been upgraded since the 1990s. The content is to upgrade the mission computer to support more weapons. For example, the US Air Force F-16CJ fighter was originally only responsible for air defense suppression missions. After the CCIP upgrade, it is equipped with an MMC mission computer that can support photoelectric targeting pods, laser-guided bombs, etc. Weapons, becoming a multi-purpose fighter with air defense suppression and precision strikes, means that fewer warplanes can be used to perform more combat missions, thus reducing the size of the Air Force fleet, which is increasingly expensive when modern fighters are increasingly expensive.
JH-7A digital style four wire controls replace the original analog triple redundant fly-system which includes a light weight, small size and other characteristics, can also be linked to a fire control system intersect, forming fire /Fly integrated control system, the system can give the aiming high and low angle error and azimuth error according to the tactical task situation, and send it to the integrated display and the flying fire coupler. The flying fire coupler calculates the optimized flight command and is coupled by the super control. The integrated machine realizes automatic/manual control of the aircraft and completes the optimized flight action. In particular, it is possible to maintain the stability of the aircraft in the complex airflow conditions at low altitudes, thereby improving the accuracy of the weapons placed on the aircraft.
In order to support the expansion of multi-purpose capabilities of the aircraft, the JH-7A is also equipped with a variety of pods. For this purpose, two hanging points are added to the belly to hang. The pods mounted on the JH-7A include blue sky low-altitude navigation pods and photoelectric aiming pods. The former includes wide-view infrared detection systems and terrain-following radars. The latter includes forward-looking tracking systems, CCD cameras, laser meters and The Inertial Navigation System, which is equivalent to the AN/AAQ-13 pod and the AN/AAQ-14 pod of the US Blue Shield system, provides the JH-7A's day and night all-weather precision strike capability. The navigation pod can be cross-linked by the flight control system, allowing the fighter to carry out long-distance attacks and attacking the target with the harsh weather at night; the JH-7A is also equipped with a command transmission pod to support the fighter's defense capability outside the zone.
The JH-7A is equipped with a domestically produced KD-88 medium-range air-to-surface missile. It uses a TV-guided plus command guidance method. The data transmission pod can support the KD-88 "post-launch lock mode", that is, the target that the missile will obtain after the launch. The image is sent to the fighter, which is carried out by the weapon operator in the back seat, and can choose the weak part of the target to attack, and can also evaluate the attack effect; the JH-7A can also mount the electronic warfare interference pod, cooperate with the onboard electronic warfare system, and launch the YJ-91 counter. The ability to radiate missiles and electronic interference, performing accompanying screening tasks. In addition, due to the better performance of the PD radar, and the better maneuverability, it can be retained in the air for a long time with the support of the AWACS, using SD-10 active radar guidance to kill the cruise missile. It is precisely because of the versatile features of the JH-7A that it can perform a variety of tasks to reduce the burden on the Air Force's main fighters, allowing them to concentrate on performing air superior combat missions.
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