Chapter 1121: Be on Guard Against Others

"Additional preparation?"

Liang Shaoxiu frowned slightly:

"But according to the experience of colleagues in brother units, customers in the Middle East generally... don't care much about money."

Chang Haonan thought that the other party wanted to express that the dog rich buy equipment without considering the cost performance.

This has been a stereotype of domestic and foreign trade for a long time.

"How is it possible..."

He waved his hand:

"Oil guys are just rich, not stupid... We see others buying things without caring about the cost because they are essentially spending money to buy more important things."

Liang Shaoxiu was slightly stunned, and then realized that they were not on the same channel.

So he quickly explained:

"No, what I mean is that the people who are responsible for docking and purchasing generally don't care much about money... At least they don't care much about the money we can afford."

This time, Chang Haonan also reacted, and helplessly held his forehead:

"The preparation I said is not to buy off the key personnel on the other side... but to prevent other competitors from doing bad things during the bidding process."

International military procurement projects like this must be carried out in several rounds.

Considering that none of the three companies actually selected have finished products yet, the competition will definitely be based on paper performance and the political power behind them at the beginning.

But such a large order will inevitably require actual testing in the end.

And in this process, there are too many tricks that can be played.

For example, when Persia went to the United States to purchase fighter jets, Grumman asked its own F14A to turn on the engine first to consume some fuel.

The actual thrust-to-weight ratio of the aircraft is not so ugly.

Liang Shaoxiu had heard this story before, but he was an honest man after all, and lacked a deep understanding of the dangers of the international arms sales industry:

"But the early warning aircraft does not consider mobility or ammunition load... How can it do harm?"

"It is impossible to release interference secretly during the test, right?"

Chang Haonan couldn't help but curl his lips:

"It's hard to say..."

"When the Greeks were bidding for a new tank, when the Challenger and Abrams were undergoing field tests, the French sent agents to the test site to secretly place jammers, causing these two models to not even be able to follow the test route accurately..."

Liang Shaoxiu's facial muscles twitched slightly, and he obviously wanted to laugh but held back:

"So... the French Leclerc tank won in the end?"

"That's not the case..."

Chang Haonan shook his head:

"Because the performance of these three products was very poor, the German Leopard 2A4 was cheaper."

"..."

Liang Shaoxiu finally couldn't hold it back.

Chang Haonan couldn't help laughing...

After a while, the two of them stopped smiling and returned to the topic:

"Anyway, although it is difficult to use these tricks in the test of air equipment, we must be on guard...On the one hand, we don't deal with the Swedes much, but as for David...we can't expect them to have too many bottom lines, you know that."

"On the other hand, there is no need to bribe any decision makers to sabotage during the test, as long as we get through some low-level links. In this regard, David has been dealing with them for decades and is much better than us."

Liang Shaoxiu lowered his head and thought for a moment, then analyzed:

"As for the aircraft itself, as long as the French personnel participating in the selection on site do not have any problems, there will be no hidden dangers. Besides, no matter how bold David is, it is unlikely to tamper with the French aircraft, so the risk should be concentrated on the airborne radar..."

Speaking of this, he hesitated a little--

Although he has participated in or presided over the development of three types of early warning aircraft in a row, he is not an expert in the field of radar after all.

It would be safer to call the comrades from the Electronic Technology Group:

"Mr. Guo is still in Beijing now. Comrade Fan Jimin is temporarily in charge of the equipment testing of the early warning aircraft. Do you need me to call him over as well?"

This is the good thing about Gaojing.

There is a very complete military industry in the local area, especially the military aviation industry.

The problems that require flying in other places can be solved by riding a bicycle here.

"Okay."

Chang Haonan looked at the time:

"It's just right. I will also tell you about the early warning aircraft and some key points of the entire bidding..."

The order from the big dog owner was too sudden.

And at this critical moment, he couldn't abandon the half-finished project at hand.

He could only entrust it to a more reliable comrade to take charge.

...

After receiving Liang Shaoxiu's call, Fan Jimin stood next to the former in less than an hour.

"Academician Chang, I have heard a lot about you..."

As a rising star promoted by Guo Lin, today was the first time he met Chang Haonan in person.

Because of excitement, there was a clear tremor in his tone.

Chang Haonan didn't respond, but handed a bottle of water to the panting man:

"The conditions here are average. We didn't prepare any tea, so we'll just use mineral water..."

After a few words, Fan Jimin calmed down again.

Then, Chang Haonan repeated his concerns to him, and then analyzed:

"'Gaoming' is a wide-bandwidth radar with pulse compression processing capabilities. It is indeed less susceptible to interference overall. Of course, everything has two sides. If the other party prepares in advance to target it, it is not without weaknesses."

"If you think about it from the perspective of the interferer, the most effective way is probably to take advantage of the fact that the working wavelength of broadband radar is much smaller than the size of the target, and use interpulse coherence accumulation technology to carry out intermittent sampling and forwarding interference..."

"..."

The range resolution unit of broadband radar is much smaller than the target size. Therefore, a complex target illuminated by a signal can be regarded as a collection of scattering centers. The echo signal is no longer a simple copy and delay of the transmitted signal, but contains local subtleties. Characteristic composite signal of multiple scattering centers.

In other words, the resolution is higher.

This characteristic makes it difficult to effectively accumulate the echo signal energy of the broadband radar within a repetition period, and it is almost impossible to interfere with the method used by Chang Haonan on the Konggan 100 pod.

But as a price, once the coherent interference obtains sufficient processing gain and even performs characteristic fine modulation of the interference signal, the damage caused to the echo signal of the broadband radar system will be more serious.

It can be understood as "Precision things are not prone to problems, but once problems occur, it is difficult to solve them."

Fan Jimin's reaction was also very quick:

"Then the best response strategy should be to develop more effective low-interception technology so that the other party cannot perceive the radar search signal at all?"

It should be said that anyone who can be favored by Guo Lin must have no problem with his abilities.

But the experience is still lacking.

"Low interception technology does cure both the symptoms and the root cause, but it requires major changes to the radar from beginning to end."

Chang Haonan replied:

"According to what Comrade Shaoxiu learned, Party A's initial plan comparison phase should begin soon. The entire bidding is expected to be completed within 18 months. We hope to receive the first aircraft in 2005... I'm afraid we are not that Much time.”

"That……"

Fan Jimin looked troubled.

Electronic warfare actually has very strong turn-based characteristics.

Everyone learns the same set of things. Basically, you make a move and I take the move. The upgrade path is very clear and there are not too many tricks.

And generally speaking, the difficulty of interference is much lower than that of anti-interference.

Especially in the context of this kind of bidding.

Because the other party doesn't have to completely disable your equipment, it just needs to slightly affect the work efficiency.

Even if a radar is one generation ahead of its time, if it is deliberately targeted, the latency will inevitably increase or the resolution will deteriorate.

In actual combat, this will have no impact.

But when compared with Party A’s eldest father, the gap is very obvious.

After a brief silence, Chang Haonan was the first to break the deadlock:

"Actually, the pulse-to-pulse coherence accumulation technology itself is not yet mature. In addition, the David Kingdom will not really fly an electronic jammer to cause trouble. It is more likely to target a specific radar waveform..."

"So we can preset commonly used waveforms such as truncated M sequence signals, OFDM signals, and LFM signals, and switch directly once we find problems..."

"..."

Fan Jimin's eyes widened slightly.

The so-called low interception technology is generally also called flexible beam control.

It can be understood that the beam characteristics and parameters are adjusted through algorithms to avoid being analyzed by the other party.

Chang Haonan's idea is equivalent to starting a horse in a local way.

Flexible, but not completely flexible.

But it’s just as he said just now.

It is enough to deal with the small tricks that the opponent may use.

"Then after I go back, I will ask the institute to make some adjustments to the radar control system..."

Chang Haonan nodded, and then gave a special instruction:

"Don't disclose this matter to the French side for the time being. At least we have to wait until the first phase of the bidding is over..."