Chapter 317: Pick the Big One
The power supply capacity, equipment size, and diversity of means of warships are obviously much greater than those of missiles. This determines that the warship can use a variety of means, including active, passive, chaff, angular reflection, active decoys, etc., with a wide coverage and high power, which missiles themselves cannot compete with.

Therefore, if we want to improve anti-interference capabilities under the existing conditions by relying on computers, there is no hope of relying solely on radar cooperation, and we have to find another way.

Speaking of this, Comrade Lao Qi is no longer sleepy.

"Counselor Gao, please be more specific." If you can, say more.

Gao Zhendong said: "In my opinion, with the advancement of electronic technology and other technologies, all equipment will face two deficiencies in capabilities: one is anti-interference capability, and the other is target recognition capability."

Both concepts were relatively new at that time. In fact, to some extent they were the same thing, but not exactly the same. This made General Qiu and Engineer Qi pay more attention to them. After all, electronic countermeasures in missile warfare only began to be encountered after 1962 during the air defense operations with the U-2.

At that time, there was no electromagnetic interference technology in the world against anti-ship missiles, otherwise it would not be so easy for Pharaoh to get the first kill record.

"Interference? Senior Advisor, I'd like to hear the details."

Gao Zhendong said: "The current missile uses terminal active radar guidance, right? As the defending party, theoretically, we can use many means to interfere with the missile's radar."

Gao Zhendong gave a general introduction to the various active and passive interference methods, but did not go into too much detail. As for why he knew these technologies that don't even exist yet, you'd have to ask him if he was a genius. I figured it out on my own through theoretical study and random guessing.

Even though electronic technology has been advancing by leaps and bounds in the past few decades, it is not an exaggeration to say that it is "old" when it comes to its basic principles. The latest basic theory of semiconductors was proposed several years ago. But what Gao Zhendong said has nothing to do with semiconductors directly.

Electromagnetic dominance is called the "invisible battlefield". One advantage is that even if Gao Zhendong talks all the talk, no one can find anything wrong with it. Now there is no such thing. Am I not allowed to think ahead? If you can't think of it, does that limit me from thinking of it?

Qiu and Qi were stunned by Gao Zhendong's introduction.

"Corner reflector?"

"Chaff interference cloud?"

"Full frequency blocking?"

"Threshold coverage?"

"."

The simplest of these is undoubtedly the corner reflector, and then there is the foil interference cloud.

These two things do not require any high-tech equipment and do not cost much money, but as for the effects, Lao Qi himself knows best.

The two looked at each other and broke out in cold sweats. If it was really Consultant Gao who used this method, how high would the hit rate be? It really depended on luck.

The two looked at each other and asked the most concerned question: "How to solve it?"

Gao Zhendong spread his hands and said, "There is no need to solve it for now, and it cannot be solved. If you must say, we have to wait for the development of technology."

Mr. Qiu:?

Qi Gong:?!

Mr. Gao, what do you mean by this? It's really not nice of you to raise a question and then walk away.

Seeing their expressions, Gao Zhendong said, "I've analyzed that the enemy hasn't thought of this yet. They won't react unless they suffer some losses, so there's no need to solve it for now."

"As for the inability to solve the problem, it is fundamentally necessary to develop technology to eliminate this influence. Even radar-related technology cannot eliminate it. It can only be weakened. It can only be solved by combining other technical means."

Weaken? Weaken is fine, no technical means are 100% reliable, and similarly, if the probability of hitting is increased, it can be regarded as solving the problem to a certain extent.

Qi Gong was impatient: "Advisor Gao, then tell me how to weaken it."

As the person in charge of the guidance system, what Gao Zhendong said just now was like a bolt from the blue to him. Although he knew that these methods were not 90% reliable, if the hit rate of a missile dropped from 45% to %, in order to ensure combat effectiveness, it would not be as simple as doubling the number of missiles.

Gao Zhendong began counting on his fingers.

"One is to improve the radar, enhance the RF performance of the radar itself, or enhance the signal processing capability of the radar backend, use better signal processing algorithms, and further improve the overall performance of the radar under limited RF performance."

This is the best way to solve the problem, but it is extremely difficult. "Backend? Then the DJS-60D will be even more useful," said Mr. Qiu.

Gao Zhendong nodded: "It will be useful, but I doubt whether the computing power of DJS-60D can meet the demand. Radio frequency signal processing is not the strong point of this general-purpose computer. The architecture of DJS-60D is inherently not adapted to the large number of convolution operations, Laplace transform, Fourier transform, z-transform and other computing operations in signal processing, and its performance may be limited."

This is why people who used to work on radar basically don't discuss CPUs, but instead talk about FPGA/CPLD or DSP chips.

The CPU capabilities at that time were limited, and it was not enough to use it for signal processing, unless it was a dedicated DSP chip. However, at that time, everyone who knew about our DSP chip technology understood it.

No matter how large the number of radars is, it is not necessary to make chips specifically for them. At this time, the internal transistor connections can be freely programmed, and once the programming is completed, FPGA/CPLD that can achieve high-speed computing at the hardware level can come in handy.

As soon as Gao Zhendong said this, Qi Gong knew that Gao Zhendong had really considered this issue and even studied it specifically. Nowadays, automation majors don't necessarily learn such a wide range of things in radio frequency, time domain, and frequency domain.

Following Gao Zhendong's train of thought, this was indeed the case. He didn't know about the DJS-60D, but he knew about its previous generation DJS-59. It was indeed a little lacking in efficiency when used to process radar signals.

Seeing that he was a little disappointed, Gao Zhendong said, "Although computers are not good enough for processing radio frequency signals, they are not completely useless. At least they can help to develop the technical research of digital signal processing in advance. And if they are properly designed, they can still improve the current situation. What I want to use is actually another ability of computers: memory and motion trajectory calculation."

These two capabilities are not something that can be easily achieved by so-called analog computers.

Seeing Gao Zhendong's clear thinking, Qi Gong was also quite confident in his ideas: "Counselor Gao, please give me some advice."

Gao Zhendong drew a schematic diagram of the ship and missile on paper: "My idea is this: the missile-borne computer stores the position and motion status of the target signal at any time. When the missile-borne computer determines from the radar signal echo that it is being interfered with, the target is lost, or a new target with a large azimuth jump suddenly appears, it will no longer rely on radar guidance, but will calculate the motion trajectory based on the target's last position and motion status, and then shoot along this motion trajectory!"

This set of techniques actually has some of the same meaning as the early interception of ballistic missiles.

In the early days of ballistic missile interception, it was more about calculating the trajectory rather than finding the target.

Finding a target and shooting at it, apart from anything else, would place extremely high demands on the interceptor missile. Fortunately, the trajectory of a ballistic missile is basically fixed, so the target trajectory is calculated, the interceptor missile goes straight to the predetermined airspace, and then relies on terminal guidance to solve the problem.

If you want to be more brutal, you don't need any terminal guidance at all and just go for Big Ivan.

When Qi Gong heard Gao Zhendong's idea, he thought about it and thought it was quite interesting. You can't see, right? Then I'll guess, guess with evidence, and the hit rate will definitely be much higher than pure blind guessing.

Mr. Qiu also nodded: "Well, this method is quite interesting and can solve some problems."

Gao Zhendong smiled and said, "In fact, with the onboard computer, we can do other things. For example, when we arrive at the target area and find multiple targets, we can choose to attack according to the preset mode. For example, no matter the signal quality, we can keep tracking or calculating to attack the predetermined target. Another example is to pick the big one and attack it!"

Gao Zhendong couldn't help but brought up a famous meme in the military fan circle.

Qiu and Qi were stunned for a moment, and after thinking about it, they found it quite interesting: "This is a good idea. There are multiple preset attack modes, such as the one just now, which can be used to attack enemy transport fleets. The larger ones can hold more."

"Old Qi, you know what, this kind of processing involving preset modes and multiple attack processes is really hard to solve without a computer."

The four people discussed in Gao Zhendong's office for a while. The other three discussed, and Su Weihua was mainly responsible for recording.

Later on, we mainly talked about fire control and command. After all, the fire control and command system with or without computers is completely different. Computers are not omnipotent, but they can make many functions simpler, more direct, more visual and more user-friendly.

Finally, Mr. Qiu mentioned another reason for coming here: "Advisor Gao, I heard that you still have a DJS-60D prototype? I wonder if it would be convenient for you to provide one to us?"

Gao Zhendong was stunned. Wow, you are still thinking about this, right?

He calculated that he already had Unit 0, which was enough for him to use. He also kept two units for emergencies, which were quite suitable in the current situation.

The sooner they can get the DJS-60D, the sooner they can start research on strapdown inertial navigation and fire control command systems. Both of these are actually general technologies and can be easily extended to other missiles, aircraft, and ships.

So Gao Zhendong did not hide it: "Yes, there are, but not many. I can only give you one."

This is the case of "the early bird catches the worm". Everyone needs this thing, so whoever asks for it first will get it, not to mention that Su Weihua has a relationship here.

Mr. Qiu was overjoyed. No matter how much of a role Xiao Su played, it was always right to bring him along: "That's great, Counselor Gao. I'll handle the relevant formalities right away."

(End of this chapter)