Chapter 1153 A Gift From Heaven

After listening to Chang Haonan's interlocking plan, Ding Zhongli's expression was very interesting for a while.

If we use the way of the Internet era in the future to summarize it, it is...

6.

Not to mention borrowing a knife to kill someone, the knife borrowed is still someone else's own knife.

The key is to cleverly use the psychological blind spots of most people. Before the final and most fatal output is played, it is almost impossible for anyone to prepare in advance.

However, it is not completely without problems.

Because the premise of all this is that you can really come up with a sufficiently convincing algorithm to make the whole world, at least the academic community, accept the methane concentration results inverted from the spectral results.

Otherwise, it will end up being a self-inflicted blow.

However, the integrity of the academic community on climate and environmental issues...

It can only be said that it is stronger than the public opinion community.

But not much.

In fact, even the two most famous comprehensive academic journals in the world, namely Science and Nature, have clear positions on many issues.

If the research results submitted in the past do not match the position behind the publisher, then unless it is a god-level paper that is so strong that it is irrefutable, it will most likely be rejected.

Therefore, Ding Zhongli still seemed a little worried:

"Academician Chang, I certainly believe in your theoretical ability... But climate research and engineering projects are not quite the same. The cycle of observing the evolution of the earth is generally based on 10 years, and it is difficult to come up with a convincing enough result through experimental means..."

"What I am worried about is that the other party will directly encourage the academic community to oppose this inversion algorithm itself, and the media and the public obviously have no ability to judge whether the algorithm is correct or not. In the end, it will become whoever makes the loudest voice is right... You know, we generally don't have any advantage in this regard..."

His statement is still too conservative.

China is more than not dominant in the public opinion level.

It was simply defeated.

However, Chang Haonan did not expect to rely on domestic media from the beginning:

"If we directly propose a new atmospheric composition inversion method, then the purpose is indeed too obvious... Even if the other party cannot directly raise objections, they will be alert in advance, making us lose the surprise of the attack."

"So I plan to start with the theoretical level that is not directly related to climate issues. After all, it is my old profession and I still have some influence in this area... After the mathematical and engineering communities have basically recognized the theoretical foundation of the inversion algorithm, I will introduce a more targeted and specific algorithm suitable for the field of atmospheric remote sensing."

Looking at the other party's confident look, Ding Zhongli immediately understood.

This should be a draft that has been prepared long ago.

He originally wanted to ask what the specific theory was, but after thinking it over, he felt that this was not his area of ​​expertise. If the other party explained a lot and he didn't understand it at all, it would be a bit embarrassing.

So he simply skipped the middle part:

"Then after I go back this time, I will sort out the research results accumulated in the past in advance and prepare to assist you, Academician Chang?"

"You can't say that..."

Chang Haonan waved his hand quickly:

"Director Ding has been running back and forth on the climate issue and has argued for more than ten years. If he becomes an assistant just because I intervened once, wouldn't it seem that I am taking over the initiative?"

In this matter, he was not prepared to stand directly in the open.

Firstly, the two sides do have different divisions of labor, and the IPCC meetings are basically held in Europe, and Chang Haonan can't go abroad casually.

More importantly, the AE1500 will need to use low emissions as one of its core selling points in a few years.

So he must play the good cop now, so that he can bring up environmental protection issues in the future.

Otherwise, when others check, they will find that it was you who made trouble in the past few years and messed up the IPCC's assessment report and climate agreement, and then the boomerang will hit his head...

In short, both of them were very satisfied with this meeting.

After another round of mutual flattery, they left separately...

...

After returning to the laboratory, Chang Haonan immediately turned on his computer and wrote a series of titles on the first page of the document -

"An optimized Levenberg-Marquardt iterative algorithm for global convergence of optimized initial guesses and damping coefficients. "

This is the first step in his entire plan.

It is also the most important step.

For satellite remote sensing, forward modeling is equivalent to describing the physical process from atmospheric parameters to observed values, that is, using the physical process of radiation transmission to simulate the radiation brightness of the sensor.

Then correspondingly, the inversion process is to establish a cost function under the optimization theory, and gradually approach the true value in an iterative form.

Specifically for the problem of atmospheric component detection, in addition to the parameters that can be directly obtained by the sensor, the cost function also includes the error covariance matrix of the observed radiation, the initial value of the unknown target vector, and the covariance matrix that can accurately describe the background field prior value.

The second item does not completely rely on empirical guessing because the "known" carbon dioxide concentration can be used as a reference. Therefore, the essence of the inversion problem becomes to seek the minimum value of the cost function.

The most effective method that Chang Haonan could think of in a short period of time, but one that would not arouse particularly high vigilance, was to improve the Levenberg-Marquardt iterative algorithm at the theoretical level.

After all, this algorithm can play a role in many iteratively solved optimization problems.

This also includes machining and fluid dynamics calculations.

As a mathematician with a background in computing science, it is normal for him to study this kind of subject.

In fact, if he had more preparation time, Chang Haonan would be willing to consider some fast algorithms based on neural networks.

Unfortunately, neural networks have relatively high requirements for spectral resolution and require a large amount of statistical data for model training.

Considering that the IPCC’s fourth assessment will begin at the end of the year at the latest, we still chose to seek stability.

In fact, under normal circumstances, the normal order of writing a paper is the main body first, then the conclusion, then the abstract, and finally the title.

However, Chang Haonan already had a rough idea of ​​the entire content of the article, so after deciding on the title, he wrote the summary directly in order.

But after writing only a few sentences, he stopped typing on the keyboard——

If he were the only author of this article, even with the title of Philippine Prize winner, it would seem a bit weak.

Moreover, when Ding Zhongli uses it as a theoretical basis, others can also argue that "this is all a Chinese conspiracy" and so on.

But if we can bring some foreign institutions into the water...

Thinking of this, he immediately picked up the phone receiver at the corner of the table and called Liang Shaoxiu who was in Haojing...

…

"So... you are saying that the thermal deformation error of the system point (ERS) during the aircraft assembly process can be optimized?"

A few days later, Didier Casore looked at a research report written in two languages ​​in front of him with somewhat surprised eyes.

He has already experienced China's theoretical foundation in aircraft pre-assembly.

But even in the production plan at that time, the ERS point, as an enhanced reference system point for calibration, still needed to be manually calibrated by workers.

It has only been more than half a year, and it seems a bit outrageous that even this step can be done without manual labor.

However, his surprise did not last long.

"Of course not yet."

Liang Shaoxiu shook his head:

"But on a theoretical level, it is indeed possible..."

As expected, Casore took the bait, showing a somewhat struggling expression——

After the successful pre-production at the beginning of the year, people in the company asked every day whether similar technology could be used on Falcon 8Z or Rafale.

Even the Airbus Group next door has people coming to make insinuations.

This feeling of enjoying the stars and the moon is still very good.

Unfortunately, he could only give a negative answer every time, and eventually let the other party leave with disappointed eyes.

But now, there is an opportunity to follow up the research from the beginning...

Belonging is the joy that comes from heaven.

It's hard not to be moved.

However, Kasore still had some self-awareness after all, so he did not respond directly, but put on a distressed expression:

"But I'm an engineer, not a mathematician..."

"Me neither!"

Liang Shaoxiu interrupted the other party pretending to be excited:

"So I suggest that in the name of our two companies, we jointly sponsor a team composed of Chinese and French researchers to let them solve theoretical problems... This way we can focus on the later production and testing parts, and we can Save a lot of resources and time..."