Chapter 428

At this time, Zhang Yunfeng, with a pale smile, opened his mouth to more than ten thousand people under the stage and said: "the 4D map you saw in the opening video will be integrated with the positioning terminal of the Dongchen positioning system. At that time, we will provide three modes of maps for you to choose. The first is the traditional 2D map. Second, plane 3D map, what is called plane 3D map, I think friends who are familiar with Google Earth should know something about it. The third is this kind of all-round free angle 4D map. The perspective is no longer the same as the front two. It's just above you, but you can switch and locate at will. As you can see in the opening video, it's very realistic and interesting. "

Said Zhang Yunfeng: "however, different terminals have different functions. In the current public application field, we have launched three positioning terminals for the whole society. One is to update the universal positioning module of Dongchen, the other is the vehicle positioning system of Dongchen, and the other is the handheld positioning terminal specially launched by Dongchen."

"The functions of these three terminals are somewhat surprised. For example, the universal terminal and the handheld terminal do not have an adaptive system, that is to say, it is a simple positioning system. Unlike the vehicle positioning system, it can input all the information of the whole vehicle. During the navigation and positioning, the navigation cursor is the whole vehicle rather than a single positioning point, which is good to say It doesn't mean much, but it's very important. If you have your own parking space, then after parking, you can let the positioning system record your coordinates at this moment, so with the original 360 degree driving radar of Dongchen car, you can park your car in your own parking space with the most accuracy and safety. If it's a high-end model of Dongchen, then your automatic The parking system, under the guidance of the parking space coordinate, will be more convenient and easy. Every time you go home to park, you don't need to set any data. The automatic parking system can automatically park your car in your own parking space. "

"In addition, the vehicle terminal also has the advantage that it can change its own positioning point at will like in the movie just now. Although it is not practical, it can still play a very huge role in special environment."

When listening to the audience, Zhang Yunfeng then said: "just now, you see that the altitude display of the Dongchen positioning system in the video clip. I want to explain to you that the Dongchen positioning system is far from as simple as you think. It can not only provide positioning accuracy less than one centimeter in the plane positioning, but also provide positioning accuracy in the altitude as small In one centimeter. "

When you say that, you will be surprised!

Altitude?

What is the way to measure the altitude accurately?

Seeing that everyone was shocked, Zhang Yunfeng explained with a smile, "as we all know, there are two ways to measure the altitude, one is to use the physical principle, that is, the air pressure detector, the other is to use the existing GPS positioning system."

"However, one of the problems of the former is that the measurement is not linear enough. To put it bluntly, the accuracy is not high enough, only one possibility can be measured, and the response speed is very slow. The other is that the error is too large, and the signal is very easy to be interfered. The measurement on the ground may be more accurate, but once off the ground, you want to use GPS to measure the accuracy At the right altitude, it's almost impossible. "

"Dongchen's positioning system has been able to achieve accurate altitude measurement, that is to say, this system is not only applicable to the ground, but also applicable to the air."

"Please read another short story," said Zhang Yunfeng

Then, the short story was released again on the scene, and the scene of test flight airport appeared on the big screen. However, this measurement is not the process of Zhang Yunfeng and those soy sauce parties testing together, but the video taken by Dongchen when he measured alone.

Zhang Yunfeng explained: "our positioning system is installed at the front end and bottom of the helicopter, with a distance of 0.6m from the ground, so we have subtracted the error value of 0.6m during the installation, that is to say, the altitude we display in real time is not based on the front end of the aircraft, but on the bottom of the front wheel of the helicopter. Next, Let's take a look at the altitude that the Dongchen positioning system can measure. "

At this time, the helicopter engine starts to start. A moment later, the helicopter starts to climb. The altitude table on board hasn't given any response, and Dongchen's positioning system has given a response. The height increases slowly in centimeters.

The screen is switched to two, one displays the altitude data, and the other side camera simultaneously captures the situation that the front wheel of the aircraft is off the ground at this moment.

1cm, 2cm, 3cm.

The altitude data provided by the Dongchen positioning system is extremely accurate and rapid, which highlights the whole climb process of the aircraft at this moment, which is also the most intuitive purpose of Zhang Yunfeng's choice of helicopter for test.

The helicopter flies a simple take-off and landing. In the whole process, the Dongchen positioning system accurately displays the height of the aircraft. Moreover, the system is very intelligent. Before the aircraft takes off, it first calculates the altitude of the ground, and then, when climbing, it displays the altitude while subtracting the altitude of the ground from the real-time altitude, showing the aircraft The actual height relative to the ground.

The U.S. military followed Raymond's professionals to see the huge effect of this system on the military field, especially the air force. God, this perfect and accurate support for altitude is just a customized function specially developed for the air force. If Dongchen makes this positioning terminal public for civilian use, then all the air forces in the United States can benefit from it Shallow, after all, even though the common civil terminal does not support other auxiliary functions, its core demands have been very clear. First, the positioning is extremely accurate, second, the altitude positioning is extremely accurate, and the real-time response speed is almost error free and delay free. These two points are very useful for the air force.

At the same time, in the United States, the senior management and technical personnel of the U.S. air force are excited when they see this place. Even an engineer holds a beer in one hand, and points to the TV, and says: "if Dongchen puts this kind of terminal on civil use, we will immediately add the positioning module of Dongchen for all our aircraft, so We will mark all our airport runways, which will greatly improve the efficiency and safety of the air force! "

Another engineer also said: "in this way, we will take his module as the core and develop other auxiliary functions by ourselves. I believe that it will have very strong practicability!"

Just when they were excited, Zhang Yunfeng put them into hell.

Zhang Yunfeng said with a bad smile: "because considering all factors and considering the small demand for altitude data for civil use, all civil positioning modules released by Dongchen will restrict the function of altitude. We will not completely erase the function of altitude display, but we will make necessary restrictions on the real-time performance of altitude display, so, All civil positioning terminals do not have the ability to display accurate altitude data in real time. The accurate altitude data will be updated every ten minutes. However, the approximate altitude will be displayed in real time, and the error of positioning accuracy will be about 5m. "

As soon as I finished this sentence, the military of all the countries that were excited suddenly fell into the ice. Damn it, it took ten minutes to update the accurate altitude data. If this thing is used on the plane, the cauliflower will be cold, ten minutes

The real-time altitude display doesn't have high precision. What's not pit dad?

Although for the military of all countries, Dongchen's idea is completely broken, but for the vast majority of ordinary users, the real-time high-precision altitude is basically meaningless to them, so this does not affect their enthusiasm for the positioning system of Dongchen satellite.

At this moment, Zhang Yunfeng is very calm and confident on the stage, he said: "now, let's watch a video again. This video has some special features, most of which are shot with high-power infrared camera. As for what kind of mystery is there from the inside to the bottom, please find it by yourself."

Say, the large screen plays the prepared video data again. This time, the audience finds that the video is shot in an airport. The camera captures it from a high position and captures the only aircraft on the tarmac. A 737 from Boeing doesn't look like a passenger airport. Many workers in special clothes are busy beside the 737 It seems that everyone's attention is focused on the common 737.

In the video, there is a voice similar to that in the walkie talkie, and there are Chinese and English subtitles on the video, only listening to the voice: "the ground work is ready, and the staff are making the boundary range for the landing gear of the aircraft."

The voice of Zhang Yunfeng said, "draw the change line and get ready to take off."

At this time, the screen switches to the side of the aircraft, and you can see that three staff members are holding the equipment for painting, spraying white frames around the three landing gears of the aircraft, and fully drawing the landing gear into the frame.

A staff member on the ground held the walkie talkie and said, "everything is ready."

Zhang Yunfeng's voice said: "OK, stop all lighting!"

"Roger, stop all lighting."

For a moment, the picture taken by the high-level camera fell into darkness. Apart from the light in the far distance, the whole airport was immersed in the dark. At this time, the engine of B737 sounded and the plane started.

The picture was immediately switched to the high-power infrared camera. Through the infrared camera, you can see that the 737 has started the engine and started to draw out the parking space slowly. At this time, the light in the cockpit of the aircraft is on, which is particularly clear under the infrared camera. The focal length of the infrared camera is also closely enlarged, which makes the picture of the engine room closer and closer, and the whole scene suddenly However, there were a lot of exclamations, because they saw that there was no one in the cockpit. To be exact, the plane was unmanned!

The drone is not a gimmick. After all, Lao Mei began to use drones for investigation and attack as early as more than ten or twenty years ago. However, drones all over the world are a routine. That is to move the cockpit out and fix it on the ground. Although there is no one on the plane, there is a special person on the ground to fly the plane. So, fundamentally come up