JH-7/JH-7A/JH-7B Thread

[challenge]

Re: JH-7/JH-7A Thread

SAR is basically used only for identification work. Detection work is through MTI or Moving Target Indicator. That works a lot easier, but it requires a monopulse antenna. Basically with MTI, the radar returns of a moving object is going to manifest by comparison against the radar returns of a non-moving background. What you need is a monopulse or 3D antenna, where from a single pulse is emitted by two to four emitters (four is standard) in different locations of the antenna and the returns received in the similarly different locations. So you have in one pulse, 3D information.

This should be fairly easy with current Chinese aircraft right now, given that planar monopulse arrays are standard. In fact, MTI is a listed feature on China's first operational slotted array fighter radar, the KLJ-1, and anyone else coming after that should have at least the same.

there's article about the JL-10A SAR mode in 2004,according to the article the radar beam 1:34 beam wide(?) sufficient enough to see "water dam"
by contrast F-15E APG-71 and SU-30MKK SAR mode is 1:64 resolution.
other mode more likely to included was SAR/MTI mode..

 

[simonov]

Re: JH-7/JH-7A Thread

How about the future of JH-7A?

 

[crobato]

Re: JH-7/JH-7A Thread

It seems okay for now, but the plane that really threatens it are the J-11B, because they combine the flight excellence of the Su-27 Flanker series with the convenience and logistical compatibilities of using indigenous Chinese weapons and avionics.

 

[challenge]

Re: JH-7/JH-7A Thread

How about the future of JH-7A?

JH-7 was original design to replaced the H-5 (IL-28) light bomber,just when the aircraft was about to enter production, the Russian suddently offering the Su-27 fighter.
compare with JH-7A,Su-27 are far superior in avionic,range,aerodynamic design ,bomb load and strong potential for growth.with this purchase of JH-7 was cut back in favor of SU-27 .
attempt to reengine the JH-7 with AL-31F was abandone in 1995,when is discover the entire fuselage has to redesign .instead according to Chinese source,the JH-7 with Sukhoi assisstant ,redesign the JH-7 airframe new alloy and composite material were introduce,thus increasing the life span.

 

[challenge]

Re: JH-7/JH-7A Thread

SAR mode was obtain thru doppler beam sharpening.aside from ground mapping,it can also use for airborne identification.
since each jet turbine fan engine has different "rotatin signature" a data obtain from DBS can compare it on board computer to determine friend or foe. it can also discriminate target flying at close formation at long range.

 

[simonov]

Re: JH-7/JH-7A Thread

What if J-11BS has a better performance than JH-7A, are they gonna abandoned JH-7A?thx

 

[xuansu]

Re: JH-7/JH-7A Thread

What if J-11BS has a better performance than JH-7A, are they gonna abandoned JH-7A?thx

No way. J-11B still is primarily an air-superiority fighter. It can't compare to JH-7A in terms of striking capability. Plus, JH-7A can easily integrate all present and future Chinese designed weapons, while J-11B may still be under some kind of limitations.

Most importantly, JH-7A is a completely Chinese product, and "Walking on two legs" is the overriding theme of Chinese military procurement.

 

[crobato]

Re: JH-7/JH-7A Thread

J-11B is probably not under any limitation, except probably a small per plane commission fee for Sukhoi. One can imagine that the licensing model of the J-11B to be similar to that of the Z-9.

Right now, the so called air superiority fighters in the PLAAF had always some kind of ground role requirement, even if it is to use dumb bombs and rockets. That explains---to the horror of the Russians---why Su-27s, J-11s and Su-30MKKs, are still being exercised in the manner you do with a Q-5. Even a plane that appears to be a pure air defense interceptor like the J-8II, has ground options.

The ground role currently has been expanded on the J-10 by using FLIR/IT pods and LGBs. It is expected that the J-11B would follow on its footsteps.

What makes the JH-7A unique is the ability to support antiship missiles, and stand off land attack missiles (SLAM). Notwithstanding Q-5 experimentation with YJ-81s, the current PLAAF/PLANAF doctrine is that longer ranged air to surface weapons must require a second officer.

So far it has yet to be demonstrated by the J-10S, much less the J-11BS, that these aircraft are testing the YJ-83 and KD-88 series. So far now, the JH-7A's role in the two PLA branches are safe. But if the J-10S or J-11BS start appearing exclusively and solely in entire regiments, and start carrying YJ-83s or KD-88s, then you will know the days of the JH-7A is numbered.

For now at least, both the PLAAF and PLANAF seem to be happy about the plane. The seeds of its replacement is there, but it does not appear that the PLAAF/PLANAF is rushing to enact on it.

 

[tphuang]

Re: JH-7/JH-7A Thread

JH-7 was original design to replaced the H-5 (IL-28) light bomber,just when the aircraft was about to enter production, the Russian suddently offering the Su-27 fighter.
compare with JH-7A,Su-27 are far superior in avionic,range,aerodynamic design ,bomb load and strong potential for growth.with this purchase of JH-7 was cut back in favor of SU-27 .
attempt to reengine the JH-7 with AL-31F was abandone in 1995,when is discover the entire fuselage has to redesign .instead according to Chinese source,the JH-7 with Sukhoi assisstant ,redesign the JH-7 airframe new alloy and composite material were introduce,thus increasing the life span.

jh-7a has better range and avionics than su-27. Don't let the 4000 km range of su-27 fool you. They are measured under different conditions. There is a reason su-30 aren't ordered anymore.

 

[Chengdu J-10]

Re: JH-7/JH-7A Thread

If J-11BS can only reach MK3 level, I will be really worried about the state of Chinese aviation. There should only be one goal, that is to reach the level of su-34 and the latest F-15E variants.

J-11BS "comparable to "MK3" level, as in the F-15E aircraft is "comparable" to Su-30. Doesnt mean they are the same but are either on par or better. Also don't want to assume to much, cause the information given about the J-11BS is near non existent to the public. But yeah I agree PLA should focus on reaching par level with the F-15E.

Biggest thing I would concentrate on improving are LGB accuracy and SD-10B variant allegedly comparable to AIM-120C. Improving the aircraft of doesnt really help other existing aircraft that much, but improving munition it can be installed on existing aircraft with slight modification.

JH-7A "absolute" max in which these planes should acquire is 200, cause these plane design still have that kick in it, it is never the less a Cold War airframe design. Its still got its purpose but in the future the frame doesnt have "much" upgrade potential as the Flankers. If procuring to much of these aircraft the PLAAF would be repeating history in yet again, finding a replacement for these aircraft. Flanker airframe still has many kicks in its frame and is likely to stay for a longer period.

Never the less JH-7A is better suited in the PLANAF so I assume that they will remain longer in service then the PLAAF.