The moment he heard Chang Haonan's affirmative answer, Guo Liqiang's originally tense expression suddenly relaxed, and he was obviously a lot more relaxed.

After all, this project is definitely a big job, and if it can be implemented, it will be tantamount to a splash of wealth and wealth for the missile department of their Academy of Aerospace Technology.

It is estimated that until he retires, he will no longer have to worry about the project.

"But Mr. Chang, I'm just an idea at present, a few days ago, when I waited for the Science and Technology Commission to reply, I did a little preliminary research at the implementation level, but ...... The time is too short, and there is no substantial progress. ”

When he said this, he realized that he had just been waiting for the results for ten minutes, and a layer of sweat had appeared on his body.

Sichuan Province in early September does still have a bit of an "autumn tiger" feeling, but this room is located in the shade and is well ventilated, and it is obviously not completely hot.

Chang Haonan bowed slightly, and then he pulled the few documents that had just been pushed in front of him and flipped through them carefully.

Just as Guo Liqiang said just now, he really didn't write much about the two parts of positioning and missile control algorithms, after all, these two parts have already involved the theoretical field, and it is impossible for ordinary people to come up with any results just by thinking about it.

However, he still made some useful designs for the use of this multi-source network detection system.

For example, the two "detection missiles" fired by the carrier aircraft platform should choose as different ballistics as possible, and together with the carrier aircraft itself, approach the general position of the target from multiple angles, so as to capture the effective signal data of the largest possible length and achieve accurate detection of the target in the whole domain.

However, this also means that the trajectory of the traditional air-to-air missile that goes straight and high-pitch and dives is no longer applicable at all, and it is necessary to refer to some ballistic characteristics of the ground-to-surface missile to meet the tactical requirements.

In addition, even with a directional data transmission system, the two bombs are still three independent entities after all, and they are still in rapid relative motion, so how to "combine" or "splic" the radar signals that are not necessarily continuous that are captured by each other is also a big problem......

"Not bad...... Nice......"

Chang Haonan glanced at the words on the page quickly, and secretly affirmed this content in his heart.

In just a few days, Guo Liqiang has already grasped the two key issues.

Before, he and the other party could only be regarded as nodding friends, but he didn't expect it to be a bit of ink......

For Chang Haonan, reading a good technical document feels no less than those literary idiots in ancient times reading a masterpiece.

So I can't help but be a little excited, especially when turning the page.

However, just as he was ready to see what was going on......

Whoop -

I found that the next page was blank.

Obviously, this report, it's not finished.

Chang Haonan felt almost the same emotion as Professor Roger Elinor:

"How did you get to this point?"

But in the end, it was still tense.

For a study, asking questions is at least as important as solving them.

Guo Liqiang can write this step, which is already quite good.

After all, if the rest of the content can be supplemented, there is no need for the other party to come to him from thousands of miles away.

……

After calming down a little, Chang Haonan took out a pen from the pen holder:

"I just briefly sorted out the working logic of the entire machine-missile network detection system."

Guo Liqiang had never worked with Chang Haonan in the past, but he could also see that this was the gesture of the big guy preparing to exert his strength, so he immediately moved the stool under his buttocks a little closer.

"First of all, it is to use the airborne passive detection system to carry out early warning detection and coarse positioning of the enemy's ultra-long-range targets or low-detectability targets, so as to provide initial information for the launch of missiles by the carrier aircraft."

Chang Haonan's painting skills have improved a lot in the past two years, but he is still at the level of stick figure plus, so he simply drew a frame instead:

"Then, the carrier aircraft and more than 2 active and passive composite guided air-to-air missiles are used to jointly network to carry out high-precision passive detection, and in this step, I think it is necessary to obtain the precise position information of the target with the help of time-difference positioning technology and filtering algorithms, and provide mid-course guidance information for long-range air-to-air missiles."

"Huh?"

Guo Liqiang's expression froze:

"Jet lag location?"

The reason why he was so stunned was not because of how fresh the algorithm was.

On the contrary, it's because it's too fresh.

The so-called Time Difference Localization (TDOA) is to determine the direction and distance of the radiation source by using the time difference in the arrival time of the electromagnetic radiation signal received at multiple points.

In fact, on the J-7, passive positioning uses this set of logic.

It's just that the "multi-point" on it is the left and right pods, which are very close to each other, so the error is very large.

Now the multi-point is one plane and two missiles, and the distance is tens or hundreds of kilometers, and the positioning accuracy will naturally come up.

So this idea is too direct, and even makes Guo Liqiang feel that it shouldn't have been thought up by Chang Haonan.

"yes, jet lag locating."

Chang Haonan next to him was also a little confused by his reaction, and was stunned for a moment before nodding:

"This should be the most suitable algorithm, Guo Gong...... Definitely heard of ...... too."

At the end of the words, he even brought a somewhat uncertain and questioning tone.

Obviously, there is still half a sentence that has not been asked-

What's so surprising about this?

Guo Liqiang also realized that his reaction was a bit excessive, and immediately explained:

"Whew...... Of course TDOA has heard of it, but I have always felt that Mr. Chang should have proposed a more ingenious algorithm to ......"

Chang Haonan, who heard the other party's thoughts, couldn't help but laugh dumbly:

"Algorithm, it's just a mathematical tool, no matter what high or low, as long as it's easy to use, if it's just to show off your skills, make a new algorithm with a higher degree of complexity in unnecessary places, but it will complicate simple problems, which is not in line with the principles of our technicians."

"That's what I said......"

Guo Liqiang nodded, obviously agreeing with Chang Haonan's statement.

The upper body that had just leaned forward also leaned back into the chair.

Even intentionally or unintentionally ignored the details of Chang Haonan's call this problem a "simple problem......

However, he had just been relieved, and Chang Haonan changed his words again:

"However, although the principle of multi-station time-difference passive positioning itself is very simple, it still requires some skills to use three positioning stations in relative motion to accurately solve the position of the target radiation source."

"In the past, on electronic warfare aircraft, because the two pods were always relatively stationary, and there was a data bus connection between the pod and the aircraft, it could be solved by a special computer, so it could be solved directly by the traditional Newtonian iteration method."

"But now this missile network detection, itself is a lot more computational, plus the data transmission rate between each other is also slow, we must not use the old method, otherwise when the target location is calculated, the missile will be almost to the maximum range......"

Guo Liqiang's upper body, which had just leaned back, sat up straight again:

"That Chang always means ......"

"Multi-station time-of-flight positioning is essentially solving a set of strongly nonlinear partial differential equations."

Chang Haonan adjusted his sitting posture slightly:

"So here, it is necessary to make a relatively complex algorithm......"

(End of chapter)