Comparison of satellite photography between China and the United States, black and white photos of China, color photos of the United States, and Chinese technology not as good as the United States?

Ladies and gentlemen, please click in the upper right cornerFollowDon't miss out on exciting content, easy to view at any time.Wen | Da He You LiaoEditor | Big Core with MaterialsIn February 2002, Russia and Ukraine engaged in a war, with heavy artillery fire, and countries around the world were paying close attention to the direction of the situation

Ladies and gentlemen, please click in the upper right cornerFollowDon't miss out on exciting content, easy to view at any time.

Wen | Da He You Liao

Editor | Big Core with Materials

In February 2002, Russia and Ukraine engaged in a war, with heavy artillery fire, and countries around the world were paying close attention to the direction of the situation.

Many countries have used satellite technology to capture the situation of the Ukrainian theater of war, and China and the United States have also released these photos. However, the photos captured by satellites from both countries have sparked heated discussions.

People have noticed that the photos captured by US satellites are colorful and bright in color; The photos taken in China are black and white, somewhat blurry.

So some people questioned, they believe that such a high comparison makes a clear judgment that China's satellite technology is significantly behind that of the United States. Is this really the case? What is the difference between Chinese satellites and American satellites? Is our satellite technology really inferior to that of the United States?

Satellites used in the United States

From the photos released in the United States, we can determine that this was taken by an optical satellite.

Because it can be clearly seen from the picture that not only is the military situation in the theater clear, but also the plants on both sides of the road are very clear. The entire photo is of high-definition quality, which clearly shows that it was captured using optical satellites.

In fact, most of the photos released in the United States are from a commercial company whose main business is to provide satellite monitoring data intelligence, as well as leasing satellites.

Some people may not be familiar with optical satellites, but in fact, the reason why optical satellites can take photos so clearly is because their imaging principle is consistent with that of cameras.

In colloquial terms, optical satellites are like eyes, and the way to obtain images is by shining light on the surface of the Earth, touching objects, and then reflecting them back. This is also why the photos captured by optical satellites can be so high-definition.

Do we have optical satellites? The answer is yes. China has had a commercial company for remote sensing satellites before, and the high-resolution remote sensing satellites developed are of excellent quality, with colorful and very clear images.

Not only can still life be captured clearly, but even high-speed fighter jets can achieve clear capture.

So there is not much difference between our commercial optical satellites and those in the United States, and our optical satellite technology is equally exquisite.

Disadvantages of optical satellites

Optical satellites are both colored and can be captured clearly, and China's optical satellite technology is not poor. Why don't we use optical satellites to capture the Russia Ukraine War Zone?

Due to the limitations of optical satellites, they can only be photographed during daylight hours. At night or when the weather is bad or cloudy, they are almost unable to work and the photos taken cannot be viewed.

Disadvantages of optical satellites

Our country has taken into account the disadvantage of optical satellites, so we used another type of satellite when shooting the Russia Ukraine Theater of War.

Satellites used in China

The satellite used for taking photos in our country is "Haisi 1", which is the first commercial SAR remote sensing satellite in our country. Its characteristic is that compared to other satellites, it is small and lightweight. The shooting principle of this satellite is active remote sensing imaging.

The optical satellites introduced earlier rely on the reflection of light, while "Haisi 1" relies on actively sending multiple electromagnetic wave pulses.

For example, if someone who cannot see suddenly touches something, their hand will retract, and this feeling will also reach the brain. The electromagnetic wave pulse will also eject and feedback to the monitoring station at the moment of contact with objects on the Earth's surface.

The monitoring station will be aware of the feedback from the electromagnetic wave pulse, and after receiving this feedback, it will process and image it.

Some people may ask, is the photo taken by this satellite black and white? Yes, because the imaging of "Haisi 1" does not rely on light, but on electromagnetic waves, the photos appear black and white without color.

Optical satellites have their fatal drawback of not being able to operate at night and in the presence of smoke and clouds, but electromagnetic wave pulses do not have such a problem at all.

Electromagnetic wave pulses are not affected by these factors and can maintain the integrity, continuity, and comprehensiveness of observations.

So when optical satellites are still limited by the influence of bad weather and continuous artillery fire in the theater, the advantages of SAR remote sensing satellites are reflected.

Why are our satellite photos so blurry?

In the satellite photos taken of Ukraine, there is a clear difference between the photos of China and the United States. The photos of the United States are clear and bright, and even the ground conditions can be clearly seen, while the photos provided by China are very blurry and can only be seen roughly.

So, is the photo taken so blurry because our satellite's resolution is not enough? The result is obviously not!

Haisi-1 is the first commercial SAR remote sensing satellite with a 1m spatial resolution and C-band launched in China. Looking at the entire world, Haisi-1's technology is also far ahead.

SAR remote sensing satellites are different from optical satellites in that they do not directly take photos. The information collected by the satellite is sent to the land through electromagnetic waves, which are processed by the land processor before forming photos.

The amount of data transmitted by remote sensing satellites is very large, requiring complex data processing to produce images, and the resulting photos are also very large.

Although news media can obtain these photos through channels, they do not have the professional processing ability, and the release of these photos is very timely. In order to rush the time, the media also has to adopt methods such as cropping and reducing resolution to process the photos.

Therefore, the "blurry" photos we see are all unprofessional, so they look like old photos from the era of the last century.

Moreover, the photos released by the media were not intended for professional rescue, nor were they intended to provide detailed maps to anyone. They were simply meant to explain the situation on the Ukrainian battlefield at that time.

From this, it can be seen that blurry photos do not mean that our satellite technology is outdated, but simply without professional processing, the imaging effect is greatly reduced.

Can Chinese technology rival that of the United States?

China invests heavily in satellite research and development every year, and our country attaches great importance to the research and development of satellite technology.

Can China, like the United States, capture satellites with rich colors and high definition? Of course there is.

Taking China's "Jilin No.1" as an example, it can not only capture color satellite images with a resolution of up to 0.72 meters, but also has a very powerful function of dynamically capturing, identifying, and tracking targets.

Moreover, if too thick clouds appear in the sky, it can easily affect the satellite's shooting effect, but for Jilin No.1, these are small issues and are easily unaffected.

The US F-22 fighter jet is notoriously difficult to track, as it can claim absolute invisibility in the air and is difficult to be captured by satellites. Jilin No.1 can not only track its flight path, but also monitor its speed.

Japan initially proposed to discharge the sewage from the Fukushima nuclear power plant into the sea, which sparked opposition from people around the world. At that time, Jilin No.1 conducted remote sensing photography of the Fukushima nuclear wastewater storage site, resulting in bright colors and clear content.

From this, it can be seen that China's satellite technology is no longer the same as it was a few decades ago. Nowadays, China has advanced technology and there is no need to underestimate itself.

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