Chapter 893 No, more advanced
This is a meme that scientific research dogs can easily understand.
In addition to highlighting, highlighting, and emphasizing as a verb, there are also some academic journals that require the author to sort out the eye-catching key points in the paper and write them at the beginning of the article, also known as highlight.
Even if you have never engaged in scientific research, this word is actually the same as the Chinese name "Gaoming", and it is easy to connect it with the mission characteristics of the early warning aircraft.
In short, it fully meets Wang Xiaomo’s requirements for “Chinese and English puns”.
Of course, what the name is is not the point after all.
For a project with such high new technology content that it is likely to exceed 70%, the most important thing is to be able to proceed step by step.
Otherwise, it will be easy to lose focus and end up in a mess.
Therefore, although this is an almost completely foreign trade-oriented model, it still needs to obtain support from higher-level units.
It would be difficult to coordinate the power of other systems even if the two companies, Electronic Technology Group and Aerospace Power Group, could come up with a certain amount of funds.
Furthermore, the technology of optically controlled phased array radar will eventually serve China's own national defense construction.
Foreign trade models are just a by-product of the technical verification process and play a role in increasing revenue, reducing expenditure and collecting user data.
So Chang Haonan and Wang Xiaomo hit it off immediately and compiled a feasibility report as quickly as possible, explaining the control of microwave signals by optoelectronic signals and optoelectronic components from both theoretical and engineering aspects. The application prospects of an idea.
Then we submitted it together.
……
A few days later.
Commission of Science, Technology and Industry for National Defense, in the director’s office.
Ding Gaoheng has been staring at the report on the table, which only has about twenty pages, for a while.
Yes, just look.
Not reading.
Because I haven’t turned a page in about twenty minutes.
What's more, he has read this report over and over again no less than ten times since he got it.
Except for the mathematical formulas, it might be an exaggeration to say that you can memorize it backwards and forwards, but if you memorize it straight on, it probably won’t be a big problem.
Before serving as director of the Commission of Science, Technology and Industry for National Defense, Ding Gaoheng was engaged in the research and development of inertial devices and navigation systems for a long time.
Although it sounds unrelated, this research direction actually involves dealing with other detection systems including radar.
As for the control system and control theory, it can be considered as a specialty.
So, he used to think that he "knew a little about radar".
However, today, he had doubts about this self-perception -
I seem to...
I don’t know much about radar either...
"Comrade Xiaomo, Comrade Haonan."
Ding Gaoheng sat up straight, looked away from the report on the table, and looked at the two people on the sofa on the other side of the office:
"I I know that a few years ago, the United States proposed a research and development plan for a next-generation destroyer called DD21. A key part of it is DBR, a dual-band radar. "
"Our multi-band radar... and the United States. Is the human DBR a similar concept? "
DD21 is actually the later famous DDG1000 Zumwalt class destroyer. It is actually still in the final stages of project bidding.
Anyone with a little discernment can see that there is a high probability that the plan proposed by Boeing and Raytheon will win.
On paper, the various technical and tactical indicators of this new destroyer are quite advanced.
After all, it is 2001 now——
Even though the United States in this timeline has encountered many additional setbacks in the military, political and economic fields compared to previous lives, it is still very Few would doubt its prowess in the technical field.
No matter how foresight you are, it is difficult to imagine that after entering the 21st century, the industrial level of the United States will experience an extremely outrageous cliff-like decline.
If anyone says at this time, the U.S. military’s package of “next-generation equipment plans” ranges from LHX Comanche helicopters, XM2001 Crusader self-propelled artillery, JSF joint strike fighters, to CG(X) cruisers, and then From the DD(X) destroyer to the LCS littoral combat ship... all of them will end hastily or be unfinished, and I'm afraid they will be regarded as crazy.
In short, right now, when everyone is developing new equipment, they will still unconsciously benchmark it against similar concepts from the US military.
But...
Chang Haonan is not among them after all.
"The dual-band radar of DD21 actually combines an S-band and an X-band radar on a common information processing back-end device. It is equivalent to using a set of back-ends to control two front-ends at the same time."
< br>“Our multi-band radar concept uses the same set of hardware from the front-end antenna to the rear-end I/O device to realize the collaborative work of two or more bands.”
"So... from a principle point of view, it is much more advanced than DBR."
This description made Ding Gaoheng's heart beat a little unsatisfactorily.
After all, I am already 70 years old, so I still can’t bear such a big surprise:
"So, should we transmit electromagnetic waves of several different frequency bands at the same time, or should we arrange multiple sets of transmitters/receivers and then flexibly switch to different bands according to needs?"
"This... mainly depends on the specific application scenario. "
Chang Haonan explained:
"Because signals of different frequencies can be separated, it can be technically achieved."
"It's just that they are transmitted at the same time. And receiving signals in multiple bands will put a lot of pressure on the back-end information processing process, so it is more suitable for platforms that are not sensitive to size and can deploy sufficient computing power, such as large early warning aircraft, fixed radar stations, and large and medium-sized ships. Radar.”
"For fighter jets, vehicles, or small and medium-sized ships, their back-end processing capabilities may be limited. They can also only work on the same frequency band at the same time, and then switch as needed."
"In addition, even in the latter case, there is no need to set up multiple transmitters/receivers."
After Chang Haonan finished explaining, Wang Xiaomo continued to add:
"Radar The front end can be made exactly the same as the previous one, just use adjustable frequency-selective permeability materials on the radome.”
“For example, I can transmit X-band and C-band at the same time. When long-distance detection is required, the radome selectively transmits the C-band signal and absorbs the X-band signal. When precise locking is required, the reverse is done. ”
Originally, according to Wang Xiaomo's understanding, for fighter jets, field of view should be more important than bandwidth.
However, Chang Haonan said that the phased array radar of a fighter jet can also be deployed on a rotating base to expand the effective illumination range by changing the angle. However, the ultra-long-range detection capability brought by the C-band is beyond the reach of traditional aircraft. It is beyond the reach of radar.
However, the size of a fighter jet makes it difficult for it to process wide-band signals at the same time.
This is not even just a limitation of computer computing power.
That’s why the second idea of “selectable frequency” came about.
"Then... I think there is nothing to hesitate about."
Ding Gaoheng said, closing the report:
"Major special funding needs to be approved by superiors before it can be put in place, but our science and engineering At the committee level, we can first allocate part of the funds from this year’s advanced technology research and development fund for your use.”
“In addition, if you need to coordinate other system units, you can also report it to me directly, or you can report it to me directly. Deputy Director Li Zhongyi is here, and he is currently responsible for external liaison work within the system.”
(End of this chapter)