Chapter 1002: An aircraft carrier was photographed?
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 was 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 content of the report is mostly theoretical.
For those who can understand, it is certainly rewarding.
But let alone the media and enterprises, 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 is probably that Chang Haonan, who was the first to give the report, was checking and filling in the gaps for Professor Jameson, who was the second to give the 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 requires solving the corresponding constitutive equation first.
This equation has no universal format and can only be analyzed in detail on specific problems.
As for this process of "finding equations", apart from the unfavorable method of making your own wheel and brute force cracking, the most suitable calculation tool is...
TORCH Multiphysics version 2.0.
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.
The result...
Promotion, probably can still be promoted.
However, it may not be him who promotes it...
As for Professor Harold Huang, although his report on the application of compact high-precision formats did not make as big a splash as the first two, COMSOL The setbacks caused the business community to 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 because you have offended people.
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 enjoyment of the vast majority of people...
...
For Chang Haonan, the previous conference was Interludes, and what happens after the conference is the main plot.
One 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, and will finally enter working status after about half a month of orbit adjustment.
However, due to many changes in the research and development direction midway, 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. I rushed all the way and slowly, at least it provided a star for the Ocean One project. Full status engineering star.
By the way, it is also regarded as a platform test.
Only then can a bunch of valuable precious equipment be loaded in completely.
But after the satellite problem was solved, 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.
So, 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.
But theory is theory. Changsanyi has not carried out a solar orbit launch mission before, so it is also a first.
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 period 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 the 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."
What he is talking about is the entire Haiyang-1 satellite project. Chief Designer, Zhang Weiyong.
"Will the first batch of photos... definitely pass the screening?"
Lan Wenjie asked, turning his gaze to Chang Haonan.
Because the content captured by Haiyang-1 is highly sensitive, it cannot send the imaging results to nearby receiving stations around the world like ordinary remote sensing satellites, and then the receiving stations transmit them to the Beijing control center through ground transmission means. Therefore, The communication window is much shorter.
According to the satellite-borne screening algorithm, if the photo does not capture the content of interest on the ground, it will not occupy the precious space-to-ground link to send it back.
“This... still depends on luck.”
Chang Haonan explained:
“Aircraft carriers are no better than merchant ships. They rarely follow fixed routes except for ports and straits. , the revisit period of a single Haiyang-1 satellite to the same location is only 3-5 days at the shortest. If you are unlucky, it is normal to not be able to find the target for half a month or even longer. "
“However, before each photo is returned, the satellite will first send out an inquiry signal. The ground can choose to only accept the information that has been preliminarily screened by the satellite, or choose not to screen and accept all.”
The reason for this design is, on the one hand, to be safe -
If there is a problem with the identification algorithm, at least this satellite can be used as an ordinary ocean remote sensing satellite and will not become scrap metal.
On the other hand, it is also considered that this satellite still has to undertake some scientific research tasks after all.
Luan Wenjie naturally heard the meaning of these words:
"So... what is going to be tested immediately is the state of receiving all without screening?"
"That's right."
Chang Haonan gave an affirmative answer:
"Now that the satellite has just entered working mode, the focus is still on testing the basic functions of the equipment on it. As for whether the algorithm level is effective ...This may take a while to try our luck.”
“Can’t we go to take pictures of ports, such as Yokosuka or Norfolk?”
A naval leader asked next to him. ：
"These are places where aircraft carriers are almost permanently stationed."
"And I remember, Comrade Haonan, you also demonstrated during the previous meeting that the algorithm can identify aircraft carriers under relatively complex background conditions. Special outline."
"Photographing the port...of course"
Chang Haonan hesitated for a moment, then nodded:
"But it's better to be consistent with our expectations. The usage situation is similar, that is, to catch a target on the high seas and ocean. If we take pictures of the port, we will lose the meaning of our ocean surveillance system..."
"That's true..."
The other party obviously recognized this explanation.
While a few people were chatting back and forth, time finally came to the first communication window of the plan.
“Report the satellite data situation!”
Zhang Weiyong walked to the command podium and instructed in a deep voice.
Soon, a voice came from the hall of the measurement and control center:
"The self-test of the satellite equipment and programs is normal, and the data is ready to be returned!"
What followed was a few seconds of silence.
As Chang Haonan said, this is the first time the satellite reports data.
It will take about 10 seconds.
But this time, the silence seemed to last a little longer.
“Report...report!”
The voice of the on-site staff showed a rare hesitation:
“The satellite report is...there are currently 77920 Kilobyte data stream.”
He even swallowed before continuing:
"There is a data stream of 16540 kilobytes...valid."
"???"
"Valid?"
I was just vaccinating Luan Wenjie , Chang Haonan, who said that he might not be able to shoot a valid target for half a month, was a little nervous.
Judging from the results, it seems that I was slapped in the face.
But he didn't seem to be beaten.
The people around him were also in a daze because of this unprepared situation:
"Effective means..."
Lan Wenjie walked to the command In front of the stage, looking at the display screen showing the words 16540 kilobytes/77920 kilobytes in the distance:
"You mean...we really photographed an aircraft carrier?"
(End of this chapter)