Chapter 1084 Prototype aircraft to be produced in China
After introducing the structural and aerodynamic design features of the "Gaoming" early warning system, the next content is naturally the real core of the early warning aircraft, which is the mission load performance.
For this part, Liu Yongquan admitted that he was not professional, so he completely left it to Fan Jimin, who had just answered the question.
Although Dassault does not have any radar system experts, Casore himself has negotiated with Ericsson for several rounds in Sweden. He has never eaten pork and has seen pigs run away.
Therefore, he did not care too much about the maximum detection distance, number of detection targets and other data in the introduction——
That’s not to say these metrics aren’t important.
But because it is too important.
When it comes time to actually sign the agreement, there are hundreds of pages of attachments to confirm in detail.
There is no way to describe it with such a simple one or two numbers.
Now it’s just a formality.
What's more, the numbers given by Fan Jimin themselves are not very shocking.
It has the ability to detect large air targets at 350 kilometers and fighter jets at 250 kilometers. It can also detect ordinary medium-sized surface ships at roughly the same distance as a maritime surveillance aircraft, and can detect them at a distance of 80-100 kilometers. A low-flying cruise missile was discovered on the Internet...
The data is a little more advanced than the PS890 system nearly ten years ago, but it is almost the same as the improved PS890M that the Swedes originally gave him.
Looks like a standard early 21st century light early warning aircraft.
The most obvious advantage is that the airborne system is a fully functional version that does not need to rely on ground stations for command. It can search for up to 300 targets at the same time and track 100 of them, and it has open data links and information on the hardware. Access capabilities to the command system.
But when it comes to the software level, users need to find their own solutions.
China does not provide a complete solution, at least in name.
However, for Casore, who listened to the plan, this was actually a good thing -
Although France is not connected to NATO's common command system, this is entirely a policy issue, and in terms of technology There are no obstacles on the way.
Even many French military equipment are equipped with link16 data link hardware.
Therefore, if China does not intervene in this aspect, it will be more conducive to the performance of its products in the international market.
If nothing else, its appeal will soar at least in the Middle East.
For a time, Casore had already begun to think about how to promote and price the product in front of him.
It is definitely more expensive than Saab 340 and similar products.
However, in terms of paper performance alone, it seems that there is no particularly obvious advantage compared to the G550AE&W.
The performance section specifically states that the cruise missile was discovered, perhaps taking into account the demonstration effect of the deterrence operation at the beginning of the year.
But when the overall performance of the radar is close, others can also conduct a wave of tests and write...
Until about twenty minutes later, Fan Jimin turned over the PPT on the curtain again page.
This time, the above is no longer a dazzling amount of data in the table.
Instead, a top view model of an early warning aircraft appeared.
A circle is marked with angles around it.
Fan Jimin’s voice sounded almost at the same time:
“The effective detection range of our radar system has reached 330°. Compared with similar products, the blind spot has almost been eliminated...”
Casore took a brief glance as usual, and then lowered his head again, preparing to continue recording his current thoughts on product development, as well as some matters that need to be paid attention to during negotiations with the Chinese people.
330°, it sounds amazing at first glance.
Compared with the early warning aircraft with disc-shaped radome, it is almost the same.
But Kasore has seen this kind of data too many times.
When in previous contact with the Swedes, Ericsson even added a front- and rear-viewing radar to the belly of the aircraft, and then brazenly claimed that its product had a 360° omnidirectional field of view.
The effective detection distance regardless of the 60° front and rear is comparable to the visual distance under clear weather.
And because it is blocked by the fuselage, it has no detection capability for the upper hemisphere.
"We are all old fools, why are you doing this with me..."
He couldn't help but cursed.
However, before he could write again, the remaining images in Kasore's mind made him realize that something was wrong. It seemed... different from the pictures I had seen before.
He raised his head again like a spring.
I soon discovered that the data in front of me not only included the available detection angles, but also the detection distance at each angle.
In other words, it is like a data graph in a polar coordinate system.
The part that covers the largest area, symbolizing the 350-kilometer detection range, occupies almost the entire side of the aircraft.
Although there are weak areas or blind areas at the nose and tail of the aircraft, even with the naked eye, the angle is much smaller than all similar solutions he has seen in the past.
Probably only 30°.
In other words, the range in which Zhenger Ba Jing can exert its early warning and detection function is 150° on the left and right sides.
Directly one fourth more than the competition.
If you consider it from the perspective of actual air combat, the extra 60° may not have any practical use.
Especially for major users, that is, small and medium-sized countries, most of the threats they face come from a single direction.
But the arms sales market is also a market, and demand can be created.
That's a surefire kill.
Of course, the premise of all this is that it can expand the detection range while ensuring other levels of performance.
Thinking of this, Casore stopped writing in his hand:
“For phased array radars without mechanical action structures, the instantaneous bandwidth is generally limited by the array aperture, sub-array Size and scanning angle... In the design plan you gave, the array aperture and sub-array size are not improved by orders of magnitude compared to similar products. So, will setting a scanning angle as large as plus or minus 75° affect the spatial resolution and Dynamic range?”
This question was somewhat beyond Fan Jimin’s expectations.
An aerospace engineer can blurt out these knowledge in the field of signal processing, obviously he has done a lot of homework before.
It is not something that can be dealt with in a few words.
Therefore, he did not answer immediately, but looked down at the notebook in front of him——
As the main technician, Fan Jimin naturally knew the answer to the question.
But he first needs to confirm what can be said about the radar design principles now.
About half a minute later, Fan Jimin pushed up his glasses and slowly said:
"In the 'Gaoming' radar system, we use real time delay technology at the sub-array level to replace the conventional phased array radar. The phase shifter theoretically avoids the impact of spatial and temporal dispersion on the instantaneous bandwidth. ”
“In fact, the reason why our radar is far lighter than similar foreign products can be used. The simplified version of the antenna bracket is also for the same reason...the delay line not only reduces the weight of the antenna array itself, but also reduces the heat dissipation and energy supply load..."
"If Dr. Casore, you have If you are interested, I can explain to you the mathematical model of the time-delay phased array in principle..."
"..."
"No, no, no... I probably already understand..."
Seeing Fan Jimin talking more and more energetically, and even preparing to go directly to mathematical principles, Casore immediately expressed his gratitude:
After all , what the other party can speak openly and openly at this stage is probably the basic theory that can be found in textbooks.
Now it is enough to know that the Chinese used a new technology to replace the phase shifter.
The key point is whether the application of new technologies will bring additional risks to the entire project.
And he asked the question bluntly.
Fan Jimin showed a confident look:
“Before proposing this design plan, we have carried out sufficient principle and technical verification, so the risks and the development cycle are absolutely It’s within control.”
After hearing the first half of the sentence, Kasore breathed a sigh of relief.
But the content that follows seems a little bit wrong:
"Of course, when it comes to projects, different carrier aircraft platforms will have an impact on link noise, pattern characteristics, delay errors, and pulse compression of linear frequency modulation signals. If you want to obtain optimal radar performance, you need to Make fine adjustments to the specific aircraft-radar combination..."
"So what you mean is..."
Kasore's face became serious.
Hearing the opponent's direct question, Fan Jimin closed the notebook in front of him, stopped talking in circles, and told himself...or the request from Chang Haonan:
"The first one The prototype needs to be produced in China and undergo complete flight and equipment testing! ”
(End of this chapter)