China Space Military：Recon, Satcom, Navi, ASAT/BMD, Orbital Vehicle, SLV, etc.

[cirr]

Subsequent to Gaofen-4

Geostationary orbit GEO resolutions《2.5/25m

科技部发布2016年度国家重点研发计划重点专项：静止轨道高分辨率(2.5米/25米) 相机技术攻关类

• 2016/02/22
  
• 默认分类

1.1静止轨道高分辨率轻型成像相机系统技术（关键技术攻关类）

研究内容：面向同时兼顾高空间分辨率、高时效观测能力的各类区域性监测任务要求，开展不低于2.5m分辨率的静止轨道光学相机系统技术研究，包括基于天地一体化的静止轨道空间轻型相机系统总体技术、相机自适应光学检测与控制技术、静止轨道高分辨率相机稳像技术等研究；完成全尺寸地面原理样机的研制，对关键技术进行地面试验验证，为发展静止轨道高分辨率光学卫星提供技术支撑，服务于我国高分辨率海陆安全监测、突发灾害探测等重大应用需求。

考核指标：

实现静止轨道不低于2.5m空间分辨率的全色对地成像和不低于5m分辨率的多光谱对地成像，实现单帧幅宽不小于100km×100km，成像质量MTF×SNR优于5（太阳高度角20°、地面反射率0.05）。

实施年限：5年

拟支持项目数：2项

高分四号：可见光谱段分辨率50米，中波红外谱段分辨率400米，400km×400km

高分四号卫星 - China Spaceflight

1.2 静止轨道全谱段高光谱探测技术（关键技术攻关类）

研究内容：针对防灾减灾、环境、农业、林业、海洋、气象和资源等领域高光谱遥感的应用需求，开展静止轨道高光谱成像技术研究，突破全谱段高光谱高灵敏探测、大口径低温光学集成装调、超大规模高灵敏度面阵红外探测器组件、高精度定标与反演等关键技术，形成波段范围覆盖紫外至长波红外的全谱段高光谱成像原理样机系统，为静止轨道高光谱探测技术及应用的跨越式发展奠定基础。

考核指标：

研制空间分辨率不低于25m（紫外至近红外波段）、50m（短波红外至中波红外波段）、100m（长波红外波段），波段范围0.3μm～12.5μm，光谱分辨率不低于0.01λ、波段可编程，单帧幅宽不小于400km的高光谱成像原理样机系统。

实施年限：5年

拟支持项目数：3项

 

[BoQ77]

I doubt about the ability of YLC-20 to track F-22 in stealth mode 400+ km away.
maybe it could track the F-22 with RCS enhancer.

 

[Lure]

Could anybody who has some knowledge about radars eloborate?

--------------------

HONG KONG, Feb. 22 (UPI) -- China's military said its latest radars can track U.S. stealth fighters, including the F-22 Raptor, the aircraft that recently flew across South Korea airspace at a time of rising tensions with the North.

China's People's Liberation Army said it had identified F-22s of unknown origin flying over the East China Sea, and in response deployed helicopters and a naval vessel, Taiwan's Central News Agency reported Monday.

Yin Zhuo, a former Chinese Navy officer and military expert, told China's CCTV that Lockheed Martin's F-22 Raptor cannot always evade radar detection.

China's response pushed the stealth fighters out of East China Sea airspace, Yin said, adding, "The F-22's capacity for evading radar can decrease if multiple radars at several bases are monitoring."

China has developed an upgraded version of the Chinese Phased Array Radar, and its KJ-2000 and KJ-500 airborne early warning and control systems can also be used in detection, Sputnik International reported.

Yin said that although the F-22 has outstanding stealth capabilities, because of its large size, multiple radar can track the aircraft from different directions.

Several Chinese newspapers reported Feb. 15 that a fleet of F-22s had flown across the East China Sea, and Hong Kong newspaper Oriental Daily News reported the unidentified flying objects were likely U.S. F-22 Raptors.

On Friday, China's populist tabloid Global Times reported various radars were being developed at an accelerated pace and will add to the military's detection capabilities that include the JY-26, with a surveillance range of 310 miles, and the long-range surveillance radar JY-27 VHF.

Chinese state media also reported Beijing was able to monitor the movement of U.S. F-22 Raptors across the Korean peninsula during a joint U.S.-South Korea military training exercise in 2013, using the JY-26 radar.

China's claims are credible, according to defense expert Dave Majundar.

"In fact – it's very possible that China can track the Raptor. Stealth is not a cloak of invisibility, after all. Stealth technology simply delays detection and tracking," Majundar wrote for the National Interest.

China tracked U.S. F-22 stealth fighters, analyst says - UPI.com

 

[nang2]

It is no secret that F-22 can be spotted by modern radars. What is still hard is to knock it off the sky.

 

[Nilgiri]

Even F-22 has an RCS, so point enough stuff at it, use enough noise reduction-algorithms and processing power from several systems operating in tandem.....and you can pick up and track almost anything (unless the object is 100% radio absorbent or transparent).

Now try fit all of this requirement into one compact system for instantaneous real time use, and you see the F-22 advantage.

 

[randomradio]

The F-22s were probably carrying the Luneburg Lens which enhance RCS so ATC can see them.

 

[C130]

impressive? not really.

 

[jhungary]

It's inherently uninformed to suggest any stealth aircraft could not be detected by radar, any radar.

Stealth works by absorb and defect the incoming radio wave of a radar tower so to appear less "Observable" on someone else radar screen. Contrary to popular believe, it is IMPOSSIBLE to 100% deflect and/or absorb all Radio wave, stealth aircraft could still be picked up with its radar signature. Just the signature the radar pick up would not be recognized as a F-22 or may even be a fighter.

The term white noise is to describe the process of signal processing to which a device (In this case, a Radar) failed to interpret the signal and assigned them as random frequency. However, with modern computational advancement, it's possible for any radar system to calculate the white noise that received and turn them into meaningful radar signal. Eg, an aircraft.

Now, going back to the topic. The topic is misleading. As:

A , again, contrary to many believe, Radar does not identify an incoming bogey, they could at most detect a signal, which interpret them as to whether or not they are man-made, nature or random. However, to identify an aircraft, one need to pursuit a VID, while a C-5 military aircraft always being mistaken as a Boeing 747, the radar can only detect there is a incoming, and guess by the signal what type or class the aircraft is, but to identify the aircraft? This is next to impossible, bar from Chinese having some alien technology that can separate each different EM wavelength emit from which US or Western Aircraft, it is impossible to do. So, by saying they can identify which aircraft it is by radar alone is untrustworthy

B.) The flight of F-22 is supposed to show off to North Korea and remind them of US present in the area. You would logically want your aircraft to be seen but not just past thru the air space without any detection, then the North Korean will simply say "What F-22? We saw nothing on radar screen" That would means those F-22 could logically donning a ECS enhance device (The Luneburg reflector) to allow the North Korean to detect the flight, Which would explain why the Chinese detect the flight as well, even if they have made VID.

 

[longlong]

F-22

It's inherently uninformed to suggest any stealth aircraft could not be detected by radar, any radar.

Stealth works by absorb and defect the incoming radio wave of a radar tower so to appear less "Observable" on someone else radar screen. Contrary to popular believe, it is IMPOSSIBLE to 100% deflect and/or absorb all Radio wave, stealth aircraft could still be picked up with its radar signature. Just the signature the radar pick up would not be recognized as a F-22 or may even be a fighter.

The term white noise is to describe the process of signal processing to which a device (In this case, a Radar) failed to interpret the signal and assigned them as random frequency. However, with modern computational advancement, it's possible for any radar system to calculate the white noise that received and turn them into meaningful radar signal. Eg, an aircraft.

Now, going back to the topic. The topic is misleading. As:

A , again, contrary to many believe, Radar does not identify an incoming bogey, they could at most detect a signal, which interpret them as to whether or not they are man-made, nature or random. However, to identify an aircraft, one need to pursuit a VID, while a C-5 military aircraft always being mistaken as a Boeing 747, the radar can only detect there is a incoming, and guess by the signal what type or class the aircraft is, but to identify the aircraft? This is next to impossible, bar from Chinese having some alien technology that can separate each different EM wavelength emit from which US or Western Aircraft, it is impossible to do. So, by saying they can identify which aircraft it is by radar alone is untrustworthy

B.) The flight of F-22 is supposed to show off to North Korea and remind them of US present in the area. You would logically want your aircraft to be seen but not just past thru the air space without any detection, then the North Korean will simply say "What F-22? We saw nothing on radar screen" That would means those F-22 could logically donning a ECS enhance device (The Luneburg reflector) to allow the North Korean to detect the flight, Which would explain why the Chinese detect the flight as well, even if they have made VID.

Base on the subject's distance, RCS, Speed, it will not be so difficult to identify they are F-22.
Most difficult part is the process of making the database for all the possible objects.

Remember: different object always feeds different signal to radar, that's the identity.

If it is detectable, it is identifiable. Some radar may mistake 747 as C-5, some will not.

 

[jhungary]

F-22

Base on the subject's distance, RCS, Speed, it will not be so difficult to identify they are F-22.
Most difficult part is the process of making the database for all the possible objects.

Actually, how do you know?

Say your radar can be clearly defined the incoming signal signature, the problem is, to identify something just by signal signature itself, you cannot say for sure what is what out there, this is the primary reason why any country, (China included) would want to have a Air Defense Identification Zone, which to VID the bogey before said bogey enter the specific defense zone.

Problem is, even if you can detect and feedback all necessarily parameter, the question remain, how do you know for sure, without actually looking at the target, that would be a F-22?

You do know, it is impossible to compile a database to match radar signature to a certain type of object. Because the environment itself play a factor, Electromagnetic field, atmospheric pressure, perpicatation level, temperature, humidity all plays a part of reflecting and absorbing radar wave. The problem is, the F-22 today will emit a different Signature yesterday and a different one a day before, there are no constant factor in signature analysis to basically compare your radar result to any matching available. Unless all the parameter is the same, I mean the same aircraft, flown thru the same cloud, at the same temperature, with the same humidity, and the same atmosphere pressure....It is basically impossible to say from a bunch of signature, what aircraft is it belong.

You probably watch way too many movie, because I used be an intelligence officer, my job was to sit in front of a radar screen monitoring AQ activities for almost a year and cooperate different SF team for my mission area (Not going to tell you more as my job are classified), and I was train to do so, there are no way you can tell without looking at it immediately that what is what by simply look at the radar screen. Or did the PLA process so advance technology that can identify any incoming without even look at it??

Remember: different object always feeds different signal to radar, that's the identity.

If it is detectable, it is identifiable. Some radar may mistake 747 as C-5, some will not.

Again, how?

IT's not about some radar. but the cross reference signature, it's not the matter of the radar, radar only calculate what they received, but not what two different item look like. A C-5 emit a radar signature that looks like a Boeing 747 because it have all the edges and trim that look like 747, it's where they will bounce off at that same trimming as a 747, it is not because the radar determined it as a 747

this some what of an argument of "This may happen in the US radar, but not the Chinese" are ridicules, how exactly it happens in one radar and the other don't?

lol @gambit come here educate these folks, won't you?

 

[BoQ77]

Can China identify a Mig-29 ?

Shantouzhai village in Yunnan province in southwestern China was accidentally bombed by a MiG-29 fighter of the Myanmar Air Force in the conflict between government forces and Kokang rebels near the Chinese border, China’s Global Times reported on March 8. Nobody was injured.

A villager told the paper, “We knew that the aircraft were flying over to bomb the National Democratic Alliance Army, and nearly all of us went out from our houses to watch the fighting.”

“Unexpectedly, we saw an unidentified object dropped from an aircraft flying closer to the village and everybody began to run.” The bomb eventually hit into the house of a local resident named Luo. Nobody was hurt but the villagers have called on the Myanmar government to compensate for the damage.

A source told the Global Times that MiG-29 fighters and helicopters were mobilized by the government to attack the National Democratic Alliance Army near the Chinese border on Mar. 8 and the bomb was likely dropped accidentally by the pilot. The source said that the airspace in the Kokang region was too narrow for the pilot to carry out the attack precisely.

Another village called Qinshuihe near the border was also shelled accidentally by the artillery of the Myanmar Army on the same day.

An entrepreneur surnamed Pan working in Mengding county where both villages are located said they have been able to hear the sounds of artillery every night since last week.

Hong Lei, spokesperson for China’s foreign ministry, said the Chinese government has already expressed its serious concern to the Myanmar side, demanding they get to the bottom of what happened and take effective measures to prevent similar incidents from happening again during a press conference held on March 3.

Source: Myanmar Mig-29 Bombs Chinese villages by mistake

 

[BoQ77]

PLA Active Duty General on China State TV (from 01:32): "F22 was detected, approached,accompanied, warned and being photographed(obtaining evidence) by Chinese jet..."

少将：F-22闯东海被发现 中国战机直接伴飞警告_凤凰军事

How long does it take to send Chinese jets to approach, accompany and take photograph the F-22 ?
Anyway, we are await for the photos
@jhungary

 

[jhungary]

How long does it take to send Chinese jets to approach, accompany and take photograph the F-22 ?
Anyway, we are await for the photos
@jhungary

meh.....again. Stealth is not invisible as I explained in some other post.

And from the look of it, it's the US intention to let every one see their F-22 anyway, they were to show off to the NK that they have these in South Korea and can deploy them when they need to. What would be the point when the F-22 were unnoticed? It would make a good joke, don't you think?

Obama - Fat Kim, you see our F-22 flying over South Korea? Do remember we have this so you should behave.

Fat Kim - What F-22? We did not see anything from our radar screen.

Obama - My bad, our F-22 should have use Luneburg lens so your radar can pick them up, you mind we do it again??

LOL.

 

[BoQ77]

meh.....again. Stealth is not invisible as I explained in some other post.

And from the look of it, it's the US intention to let every one see their F-22 anyway, they were to show off to the NK that they have these in South Korea and can deploy them when they need to. What would be the point when the F-22 were unnoticed? It would make a good joke, don't you think?

Obama - Fat Kim, you see our F-22 flying over South Korea? Do remember we have this so you should behave.

Fat Kim - What F-22? We did not see anything from our radar screen.

Obama - My bad, our F-22 should have use Luneburg lens so your radar can pick them up, you mind we do it again??

LOL.

My post based on the assumption that, China could detect the unidentified flying objects and turn out to be anything.
How long to make a visual contact?

 

[longlong]

Actually, how do you know?

Say your radar can be clearly defined the incoming signal signature, the problem is, to identify something just by signal signature itself, you cannot say for sure what is what out there, this is the primary reason why any country, (China included) would want to have a Air Defense Identification Zone, which to VID the bogey before said bogey enter the specific defense zone.

Problem is, even if you can detect and feedback all necessarily parameter, the question remain, how do you know for sure, without actually looking at the target, that would be a F-22?

You do know, it is impossible to compile a database to match radar signature to a certain type of object. Because the environment itself play a factor, Electromagnetic field, atmospheric pressure, perpicatation level, temperature, humidity all plays a part of reflecting and absorbing radar wave. The problem is, the F-22 today will emit a different Signature yesterday and a different one a day before, there are no constant factor in signature analysis to basically compare your radar result to any matching available. Unless all the parameter is the same, I mean the same aircraft, flown thru the same cloud, at the same temperature, with the same humidity, and the same atmosphere pressure....It is basically impossible to say from a bunch of signature, what aircraft is it belong.

You probably watch way too many movie, because I used be an intelligence officer, my job was to sit in front of a radar screen monitoring AQ activities for almost a year and cooperate different SF team for my mission area (Not going to tell you more as my job are classified), and I was train to do so, there are no way you can tell without looking at it immediately that what is what by simply look at the radar screen. Or did the PLA process so advance technology that can identify any incoming without even look at it??




Again, how?

IT's not about some radar. but the cross reference signature, it's not the matter of the radar, radar only calculate what they received, but not what two different item look like. A C-5 emit a radar signature that looks like a Boeing 747 because it have all the edges and trim that look like 747, it's where they will bounce off at that same trimming as a 747, it is not because the radar determined it as a 747

this some what of an argument of "This may happen in the US radar, but not the Chinese" are ridicules, how exactly it happens in one radar and the other don't?

lol @gambit come here educate these folks, won't you?

1) C-5 and B-747 are totally different flying objects and they have as different radar signature as your fingerprint---- you have to admit it.
2) Even the radar signature are similar and difficult to identify, we still have great chance to do it. e.g., route, flight timing, altitude, flying in groups, etc, a commercial aeroplane behaves differently from military one. You may have trouble to identify twins who have the same visual appearance, but they are different objects, there always have different signatures between them and that's why their parents identify them easily.
3) There don't have many different jet fighters around Korea-Japan. F-2, F-15, F-16, T-50, I do think less than 10 types. Some objects flying in a group at high speed and RCS is tenth of F-15 from 500km away, if they are not F-22, what the hell they are?