The military-industrial scientific research system of the academic master.

Chapter 1194 It would be best if we could contact Academician Chang

Bistatic radar is not a new concept to those present.

Simply put, by separating the transmitter and the receiver, it can become the simplest bistatic radar.

In addition, in actual operation, the transmitter does not necessarily need to exist independently.

Sometimes non-cooperative signals can also be used for detection.

In fact, the radar improvement plan proposed by Chang Haonan many years ago for anti-stealth purposes can also be regarded as a simplified version of a dual-base radar.

However, at that time, anti-stealth was secondary to the need to do this.

The main purpose is to ensure the concealment and suddenness of detection to avoid being physically suppressed by the EA6B on standby in the nearby airspace.

It is not exactly the same as the current application scenario.

Of course, most of the leaders in the Air Force command line were pilots, not radar system experts, so the deeper details were basically no longer clear.

The Chief of Staff He Rong took two puffs of his cigarette, and the flame at the end of the cigarette became bright red:

"If we don't change anything else but deploy the radars separately, can we improve the detection capability of low RCS?"

When asking this question, the first thing that came to his mind was those old-fashioned radars from half a century ago.

Unlike modern radar systems with a high degree of integration, many older models were designed with separate transmitters and receivers.

At that time, the power consumption and size of the components were too large to fit together.

But if it is true as the other party said, wouldn't it be easier to detect stealth aircraft if we get a few old-fashioned radars?

Li Jianqiang rarely experienced such a big scene. Although he was a little nervous, he still kept his composure:

"Although stealth aircraft use wave-absorbing and transparent coatings on the outer layer to directly weaken the energy of incident radar waves, the most important stealth measure is to use shape design to prevent the incident radar waves from returning along the original path, but to be deflected and scattered in other directions. These clutter waves are almost impossible to detect for traditional single-base radars, but can be used by dual-base or multi-base radars."

"Of course, the scattered electromagnetic wave beam is very narrow and the intensity is irregular, which can easily be regarded as background clutter and is almost impossible to receive continuously. However, the new radar developed since the 90s has strong functional flexibility and can adjust the filtering method according to actual conditions. At least in the field of long-range early warning, it has considerable operability..."

He Rong realized that he might have oversimplified the matter:

"So... this dual-base or multi-base deployment mode also has certain requirements for the radar itself?"

Li Jianqiang's performance was much smoother than before, and he nodded immediately:

"That's natural. In addition, the dual-base mode also has requirements for the deployment locations of the receiver and transmitter."

"For example, when the bistatic angle between the target and the transmitting and receiving base is around 180°, the target will be induced to forward scatter, and its RCS will increase significantly regardless of whether it is coated with radar-absorbing paint or not."

"In addition, when a target approaches the baseline of the bistatic radar from any direction, a Doppler beat phenomenon will occur. Its Doppler frequency is zero when it crosses the baseline. A beat receiver can detect this zero beat frequency, record the time when it occurs, and then calculate the target's track through multi-point calculation..."

The more he spoke, the brighter the eyes of the leaders in front of him became. It was obvious that they had high expectations for this plan.

This made Li Jianqiang feel a little guilty again.

So I added an extra sentence at the end:

"Of course, these are conclusions at the principle level. To truly achieve the anti-stealth effect of multi-base radar, specific analysis is still needed based on actual needs."

But this rebuttal obviously didn't work very well. Qiao Chenqing, Deng Changyou and He Rong looked at each other and saw the same answer from each other's expressions:

"Comrade Jianqiang, don't be discouraged. It's good to have a principle."

Deng Changyou, the political commissar, was no longer popular at this time, so he returned to his original role and began to do ideological work:

"According to the press conference over there, the F22 will not fly to Okinawa until it is announced that it has formed initial combat capability. There should be more than a month in between. Although it is definitely too late to develop new equipment from scratch, there is still room for operation of new tactics..."

At this time, Qiao Chenqing also took up the conversation with his old partner:

"Of course, we don't have to use your idea to catch the enemy. There will be other means to work together. If it doesn't work, we can also cooperate with the naval aviation and mobilize some units from inland airports to increase the frequency of takeoff response."

"But this time we have the latest aircraft in service as a sparring partner, which is definitely a rare opportunity. As the saying goes, if it's a mule or a horse, take it out for a ride... In addition, if you have any requests, you can put them forward now, and we will fully support you."

Li Jianqiang was very clear that this was definitely an excellent opportunity for him.

Therefore, he calmed himself down a bit, and then quickly searched in his mind:

"To increase the probability of capturing low RCS targets, we'd better deploy a Z-shaped radar network, so we need at least four radars of the same model, preferably new models equipped to the troops in recent years."

This is certainly a reasonable request.

It is impossible to let the horse run without letting it eat grass. Besides, the Air Force has had a much better time in the past two years. I dare not say more, but it should not be a problem to deploy four radars.

Qiao Chenqing immediately waved his hand to express his agreement.

"In addition, the best radar deployment location still needs detailed calculations. We will take into account the convenience of deployment and detection capabilities, but the principles of physics are beyond human control. The final calculated result is likely to be around the city. You see..."

Faced with this request, several leaders were not as decisive as before.

On the one hand, although the stage when the army had to endure has passed, the top priority today is still economic development, and the army is still in a weak position in military-civilian coordination.

It is not easy to coordinate with local authorities, especially those in coastal areas, on sensitive land use issues like this one.

On the other hand, dragging a new radar around the city is not conducive to confidentiality and security work.

"We try to ensure that your test session is not disturbed, but if possible, we try to deploy the radar in a relatively remote location."

Deng Changyou gave a relatively conservative answer, and then gestured to Li Jianqiang:

"Go on."

This time, the latter hesitated for a moment:

"Also...it would be best if we could contact Academician Chang."

Qiao Chenqing, who was writing down his thoughts, paused:

"You mean... Academician Chang Haonan?"

Li Jianqiang nodded:

"Many of the tools and theories we use in our research are based on his research results, so there are some things that we don't understand as well as the original author himself... Academician Chang is very busy right now. If I contact him privately through personal channels, he may not be able to receive the message quickly. Now is a time of racing against time, so..."