Chapter 1084 Prototype 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, that is, the performance of the mission payload.

Liu Yongquan considered himself not professional in this part, so he completely let Fan Jimin, who had just answered the question, to do it.

Although Dassault did not have any radar system experts, Casore himself had negotiated with Ericsson in Sweden for several rounds, and he had seen pigs run even if he had not eaten pork.

Therefore, he did not care much about the data such as the maximum detection distance and the number of detected targets in the introduction-

It is not that these indicators are not important.

It is because they are too important.

When the agreement is actually signed, there will be hundreds of pages of attachments to determine the details.

There is no way to describe it with such a simple one or two numbers.

Now it is just a formality.

What's more, the numbers given by Fan Jimin themselves are not very shocking.

It can detect large aerial 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 maritime warning aircraft, and can detect low-flying cruise missiles at a distance of 80-100 kilometers...

The data is more advanced than the PS890 system nearly ten years ago, but it is almost the same as the improved PS890M that the Swedes had promised him.

It looks like a standard light early warning aircraft in the early 21st century.

The most obvious advantage is that the onboard system is a fully functional version, without relying on ground stations for command. It can search for up to 300 targets and track 100 of them at the same time, and open the access capabilities of data links and information command systems in hardware.

But when it comes to the software level, users need to find a way themselves.

At least in name, China does not provide a complete solution.

However, for Casore, who is listening to the plan, this is actually a good thing-

Although France does not access NATO's universal command system, this is entirely a policy issue and there is no technical obstacle.

Even many French military equipment are equipped with link16 data link hardware.

Therefore, if China does not intervene in this regard, it will be more conducive to the performance of the product in the international market.

Apart from other things, at least the attractiveness in the Middle East will soar.

For a while, Casore has begun to consider how to promote and price the product in front of him.

It must be 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 G550AE&W.

The part of the performance that specifically notes the detection of cruise missiles may be due to the demonstration effect of the deterrence action at the beginning of the year.

But in the case of similar overall radar performance, others can also conduct a wave of tests and then write...

Until about twenty minutes later, Fan Jimin turned another page of the PPT on the screen.

This time, it was finally no longer a large amount of dazzling data in the table.

Instead, a bird's-eye view model of the early warning aircraft appeared.

A circle was marked with an angle around it.

Fan Jimin's voice sounded almost at the same time:

"Our radar system has an effective detection range of 330°, which almost eliminates blind spots compared to similar products..."

Casore took a quick look as usual, then lowered his head again, preparing to continue recording his current thoughts on product development and some matters that need to be paid attention to during negotiations with the Chinese.

330°, it is indeed amazing at first glance.

Compared with the early warning aircraft with a disc-shaped radar cover, it is almost the same.

But Casore has seen this kind of data too many times.

When contacting the Swedes before, Ericsson even added a front and rear radar to the belly of the aircraft, and then shamelessly claimed that its product has a 360° omnidirectional field of view.

It does not care that the effective detection range of 60° front and rear is comparable to the visual range in clear weather.

And because it is blocked by the fuselage, it has no detection capability for the upper hemisphere at all.

"Everyone is an old hand, why are you playing tricks with me..."

He couldn't help but complain.

However, before he could start writing again, the few images left in Casore's mind made him realize that something was wrong.

It seemed to be different from the pictures he had seen before.

He raised his head again like a spring.

He soon discovered that the data in front of him not only included the available detection angles, but also the detection distance of each angle.

In other words, it was like a data chart in a polar coordinate system.

The part with the largest coverage area, which symbolized the 350-kilometer detection range, almost occupied the entire side of the aircraft.

Although there are weak areas or blind spots at the nose and tail, even if judged by the naked eye, the angle is much smaller than all similar solutions he has seen in the past.

It is only about 30°.

In other words, the range that can seriously play the early warning detection function is 150° on each side.

It is directly one-quarter more than the competitors.

If considered from the perspective of actual air combat, the extra 60° may not be of any practical use.

Especially for the main users, that is, small and medium-sized countries, the threats they face are mostly from a single direction.

But the military sales market is also a market, and demand can be created.

That would be a decisive blow.

Of course, the premise of all this is that the performance of other aspects can be guaranteed while expanding the detection range.

Thinking of this, Casore stopped writing:

"For phased array radars without mechanical action structures, the instantaneous bandwidth is generally limited by the array aperture, subarray size and scanning angle... In the design scheme you provided, the array aperture and subarray size have not increased by an order of magnitude compared with similar products. So, will the setting of a large scanning angle of 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 the knowledge in the field of signal processing, and obviously 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 needed to confirm what parts of the radar design principle he could say now.

About half a minute later, Fan Jimin pushed his glasses and slowly said:

"In the 'Gaoming' radar system, we use real time delay technology at the subarray level to replace the phase shifter in the conventional phased array radar, which in principle avoids the influence of spatial and temporal dispersion on the instantaneous bandwidth."

"In fact, the reason why our radar is much lighter than similar products abroad and can use a simplified version of the antenna bracket is also due to 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 you are interested, Dr. Casore, I can explain the mathematical model of the time-delay phased array to you in principle..."

"..."

"No, no, no... I probably understand it..."

Seeing that Fan Jimin was getting more and more excited and even ready to go straight to the mathematical principles, Casore immediately declined:

After all, the other party can openly talk about it at this stage, which is probably the basic theory that can be found in textbooks.

Now all you need to know is that the Chinese used a new technology to replace the phase shifter.

The key point is whether the application of new technology will bring additional risks to the entire project.

And he asked this question directly.

Fan Jimin showed a confident look:

"Before proposing this design, we have already conducted sufficient principle and technical verification, so the risks and R & D cycle are absolutely within the controllable range."

Hearing the first half of this sentence, Casore was relieved.

But the content that followed seemed a little wrong:

"Of course, when it comes to the project, different carrier platforms will affect the link noise, directional pattern characteristics, delay error, and pulse compression of linear frequency modulation signals. If you want to obtain the optimal radar performance, you need to make fine adjustments for the specific carrier-radar combination..."

"So what you mean is..."

Casore's face became serious.

Hearing the other party's direct question, Fan Jimin closed the notebook in front of him, and no longer beat around the bush, and said his own... or Chang Haonan's requirements:

"The first prototype needs to be produced in China and undergo complete flight tests and equipment tests!"