Chapter 1002 Photographed an Aircraft Carrier?

With Chang Haonan's announcement on the stage, the entire Numerical Algorithm and Computational Science Conference reached its climax.

As for the reporting session that lasted for a day and a half...

On the contrary, the attention is not that high.

Nothing else, so professional.

About half of the actual participants of this conference are from the enterprise side, and one-third of them are not professional and technical personnel.

Since Chang Haonan intends to build the conference in the direction of "discipline forward-looking", the report content is mostly theoretical.

For those who can understand, it is certainly rewarding.

But let alone the media and companies, even researchers in the field of numerical computing, if they are not specialized in the direction of the report topic, are likely to be confused.

The only topical thing was probably that Chang Haonan, who was the first to give a report, had to fill in the gaps for Professor Jameson, who was the second to give a report——

From a theoretical level, the former demonstrated the reasons why the finite volume method results in oscillations and even calculation divergence when faced with high calculation weight problems, and proposed a feasible solution.

The only problem is that this solution first requires solving the corresponding constitutive equations.

There is no universal format for this equation, and it can only be analyzed on a case-by-case basis.

As for this process of "finding equations", excluding the unfavorable method of making your own wheels and brute force cracking, the most suitable calculation tool is...

Version 2.0 of TORCH Multiphysics.

It's already a murderous and heart-wrenching level.

Professor Jameson, who came on stage later, almost finished the whole lecture without hesitation.

He originally planned to take advantage of COMSOL's victory in the competition and promote the FVM computing system he has studied throughout his life to the entire industry and all fields.

result……

Promotion, probably can still be promoted.

However, it may not be promoted by him...

As for Professor Harold Huang, although his report on the application of compact high-precision formats did not cause huge waves like the first two, the setbacks of COMSOL made the business community re-examine the rationality of its past technical routes.

Therefore, he finally felt proud.

Although in the academic circle it is still difficult to turn around after offending someone.

But at least it has re-entered the vision of many funders.

For Harold, who had almost reached a dead end before, this was enough.

And the entire conference came to an end with the vast majority of people enjoying themselves...

…

For Chang Haonan, the previous conference was an interlude, and what happened after the conference was the main story.

A week later.

Beijing, Tanzhou Measurement and Control Station.

Including Chang Haonan, Lin Senming, Luan Wenjie and others, almost all management and technical personnel related to Ocean One gathered here.

In fact, this satellite, which has gone through many hardships and finally achieved success, had been launched as early as the end of March when Chang Haonan was still busy in the numerical calculation competition.

According to the plan at the beginning of the project many years ago, Haiyang-1 will be carried on the same rocket as the Fengyun-1D weather satellite. After about half a month of orbit adjustment, it will finally enter working condition.

However, due to many changes in the research and development direction during the process, especially after the addition of optical/radar sea surveillance test missions, the size of the entire satellite increased dramatically.

So much so that the originally planned satellite platform was unable to bear the full load.

Fortunately, the Dongfanghong IV (5-ton class) launched on this timeline was launched earlier, and the research and development speed was also faster. It was rushed and slowed down all the way. At least it provided a full-state engineering star for the Ocean One project.

By the way, it is also regarded as a platform test.

Only then did a bunch of valuable precious equipment need to be loaded up.

But the satellite problem was solved, and another trouble followed.

Ocean One needs to work in a sun-synchronous (SSO) orbit.

In the past, China usually launched satellites in SSO orbits using the Long March 4 rocket at the Jinyang Satellite Launch Center.

But the SSO carrying capacity of Long March 4B is only a meager 2.5 tons.

Not enough.

Therefore, we had to temporarily change the plan to use Long March 3B for launch in Yuecheng.

The theoretical SSO transport capacity of more than 7 tons is definitely more than enough.

However, theory is theory. Changsanyi has not carried out a solar orbit launch mission before, so it is also a first time.

In short, one move affects the whole body.

Almost everyone who can catch up has caught up.

After a series of adjustments, the launch time was limited to a narrow window in the last few days of March.

As a result, Chang Haonan himself will definitely not be able to witness the launch process with his own eyes.

Fortunately, there is still a cycle in between from launch to return and then to work.

Chang Haonan is not a satellite designer, he is only responsible for two sets of software systems: satellite and ground.

So, as long as he can be there when the satellite comes into operation for the first time.

That is now.

"Director Luan, according to plan, the satellite has officially entered working status at 3:45 this morning, and the first batch of remote sensing photos will be sent back soon."

The speaker was Zhang Weiyong, the chief designer of the entire Ocean 1 satellite project.

"Will the first batch of photos... definitely pass the screening?"

Luan Wenjie asked, turning his gaze to Chang Haonan.

Due to the high sensitivity of the content captured by Ocean No. 1, it is impossible to send the imaging results to the receiving stations around the world as ordinary remote sensing satellites do, and then transmit them to the Beijing control center through ground transmission means by the receiving stations, so the communication window is relatively short.

According to the screening algorithm on the satellite, if the photos do not capture the content of interest on the ground, the precious space-ground link will not be occupied to transmit them back.

"This... still depends on luck."

Chang Haonan explained:

"Aircraft carriers are not like merchant ships. Except for ports and straits, they rarely take fixed routes. A single Ocean No. 1 satellite has a revisit cycle of 3-5 days at the shortest to the same location. If you are unlucky, it is normal not to find the target for half a month or even longer."

"However, before each photo is sent back, the satellite will first send an inquiry signal. The ground can choose to only accept the information that has been initially screened by the satellite, or choose not to screen and accept all."

The reason for this design is, on the one hand, to provide a safety net -

If there is a problem with the identification algorithm, at least this satellite can be used as an ordinary ocean remote sensing satellite, and it will not become scrap metal.

On the other hand, it is also considered that this satellite still has to undertake some scientific research tasks.

Luan Wenjie naturally heard the meaning of this:

"So... what we are going to test immediately is the state of receiving all without screening?"

"That's right."

Chang Haonan gave a positive answer:

"After all, the satellite has just entered the working state, and the focus is still on testing the basic functions of the equipment on it. As for whether the algorithm level is effective... this may require waiting for a while and trying our luck."

"Can't we go to shoot ports, such as Yokosuka, or Norfolk?"

A naval leader next to him asked:

"These places are almost stable and permanent aircraft carriers."

"And I remember that Comrade Haonan also demonstrated in the previous meeting that the algorithm can identify the special outline of the aircraft carrier under relatively complex background conditions."

"Shooting ports... Of course"

Chang Haonan hesitated, then nodded:

"But it is better to be similar to our expected use, that is, to capture a target in the high seas and oceans. If we shoot ports, then we lose the meaning of our marine surveillance system..."

"That's true..."

The other party obviously agreed with this explanation.

While several people were chatting back and forth, time finally came to the first communication window of the plan.

"Report satellite data!"

Zhang Weiyong walked to the command desk and instructed in a deep voice.

Soon, a voice came from the hall of the measurement and control center:

"The onboard equipment and program self-checks are normal, ready to send back data!"

Next, there was a few seconds of silence.

As Chang Haonan said, this is the satellite reporting the data first.

It takes about 10 seconds.

But this time, the silence seemed a little longer.

"Report...!"

The voice of the on-site staff rarely showed a trace of hesitation:

"The satellite reported that... there are currently 77,920 kilobytes of data flow."

At this point, he even swallowed his saliva, and then continued:

"Among them, 16,540 kilobytes of data flow... are valid."

"???"

"Valid?"

Chang Haonan, who had just given Luan Wenjie a shot of vaccination, saying that it might be possible to not shoot a valid target for half a month, was a little bit overwhelmed.

Judging from the results, he seemed to have been slapped in the face.

But it seemed that he was not slapped.

The people around him were also a little stunned because they were not prepared for this:

"Effective means..."

Luan Wenjie walked to the command desk and looked at the display screen in the distance showing 16540 kilobytes/77920 kilobytes:

"It means...we really photographed an aircraft carrier?"