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科学火箭叔

科学

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火箭叔

星球

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神秘领域

地理

科普

生活科普

武器

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雷达

00:00:00

You can't imagine

00:00:01

Radar is a harmless piece of defense equipment

00:00:04

It was originally developed as a lethal weapon

00:00:07

In 1935, the British government commissioned the physicist Robert

00:00:10

Watt studied infinite waves

00:00:11

Hoping to use him to crash a German plane

00:00:14

Soon the scientist came to a conclusion

00:00:16

The difference between the annihilation of radio waves and rays

00:00:19

Just like slingshot and missile of the same difference

00:00:21

Big planes don't look like they're going down

00:00:23

But it does not seem entirely devoid of military value

00:00:26

Just a few weeks into the study

00:00:29

Watt discovered that By measuring the radio bouncing off the fuselage

00:00:32

The length of the rebound delay

00:00:34

We know where the plane is going and how far it's going

00:00:37

So! That was the beginning of radar's career

00:00:40

Which brings me to a question

00:00:41

We don't say dawn all the time

00:00:43

Did bats inspire radar

00:00:46

Look! He's another one

00:00:47

You don't want to take it too seriously

00:00:50

I'm the rocket uncle of the encyclopedia

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Today we are going to talk about the artefacts in radar

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How exactly does radar work

00:00:58

It can be powerful enough to detect something like the F-35 J-20

00:01:02

The su-57's fifth generation stealth fighter

00:01:05

It's a thousand miles

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Begins with a single step

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Let's take a look at the basics of how radar works

00:01:10

In many ways

00:01:11

They all look like our eyes

00:01:13

First of all the same purpose is to see the target

00:01:16

But one is using visible light

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The other is radio waves

00:01:20

The second! Objects that want to see in different directions need to be turned

00:01:23

The head of the

00:01:24

That explains why there are so many legends, right

00:01:26

All the radars are always on

00:01:28

rotating

00:01:29

And then you want to get a better look at your target

00:01:31

You need to narrow your perspective

00:01:33

We can use telescopes

00:01:34

Radar can increase the antenna area

00:01:37

The bigger the antenna, the narrower the wave speed

00:01:39

The more accurate the judgment is

00:01:41

But there are problems

00:01:43

He can't turn the big antenna fast enough

00:01:44

We're one lap short

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Target could be on the run

00:01:47

This is awkward

00:01:48

What do I do Radar is designed to solve this problem

00:01:51

What's the solution

00:01:53

By interference of electromagnetic waves

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It's on the antenna plane of the radar

00:01:57

There are lots of tiny units arranged in a regular way

00:02:00

They're kind of like the second eye of an insect

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Each one can be ordered

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Transmitting and receiving electromagnetic waves independently

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When these individual units emit positive

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When chord waves are propagating outward simultaneously

00:02:08

They will have constructive intervention and breach

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The bad sexual interference

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Make it stronger or weaker

00:02:14

It's like two water waves in perfect synchronization

00:02:16

When they touch each other

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Perpendicular to their center

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The ripples in the direction of the line are strengthened

00:02:20

Ripples in other directions gradually disappear

00:02:24

Ok, so these are two cases that are not exactly in sync

00:02:26

What if they're not exactly in sync

00:02:28

If the second one

00:02:29

The first one is a little bit slower

00:02:31

This is called moving

00:02:33

And so on and so forth

00:02:35

The third is a little slower than the second

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The fourth one is a little slower

00:02:38

The fifth, sixth, and NTH are all the same

00:02:40

What's going to happen

00:02:42

In fact We can use computers to control every

00:02:45

The azimuth of an electromagnetic wave emanating from a cell

00:02:48

After they interfere with each other

00:02:49

It's going in the direction we want to go

00:02:52

This is how radar works

00:02:55

Completely different from conventional radar mechanical scanning

00:02:58

He relies on the speed of the electrical scan moving towards the position

00:03:01

The difference is calculated in order of magnitude

00:03:03

And more flexible

00:03:04

Being able to track more targets is more powerful

00:03:06

Anti-interference as well as

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Better able to spot invisible targets

00:03:10

Oh, the stealth plane

00:03:11

How does radar pick it up

00:03:14

Let's give you a brief introduction

00:03:15

Say it's invisible.

00:03:16

It doesn't necessarily mean you can't see

00:03:18

Just compared to a regular plane

00:03:20

Radar cleansing is more like it

00:03:23

They usually do this in two ways

00:03:25

One is to tweak the look

00:03:26

deflection Radar waves do not bounce back the way they came

00:03:29

Sharp edges and angular structure

00:03:32

Both have obvious benefits

00:03:33

Just look at f 117

00:03:35

The second one is to use a special layer

00:03:37

Absorb the radar waves that hit your body

00:03:40

What kind of layer is it

00:03:42

Those are military secrets and we'll have to guess

00:03:44

It's said to contain carbon fiber

00:03:46

And even reinforced plastic for carbon nanotubes

00:03:48

And fine iron powder

00:03:50

Used to convert absorbed electromagnetic waves into heat

00:03:53

But the downside of these layers is

00:03:55

They can't absorb all the radar waves

00:03:57

Because the thickness of the layer is proportional to it

00:03:59

The ability to absorb wavelengths

00:04:01

The thicker the layer

00:04:02

The longer they absorb electromagnetic waves

00:04:04

The thinner the layer, the longer waves will not be absorbed

00:04:06

How thick can the fighter layer be

00:04:09

So here's radar's chance

00:04:11

Emit low frequency long waves

00:04:12

Stealth aircraft can be detected from a long distance

00:04:15

Why is the phaser radar better at this

00:04:18

Because they want to emit low frequency long waves

00:04:19

The antenna has to be big enough

00:04:21

You see, this happens to be the controller

00:04:23

Is radar a natural advantage

00:04:24

So radar and stealth

00:04:26

It's like the story of spear and shield

00:04:28

Everyone is upgrading each other and balancing each other

00:04:31

When I was in middle school

00:04:33

He likes to read all kinds of military magazines

00:04:35

Also on the America has Winston Churchill and F-22's envious gnashing of teeth

00:04:39

Now we have our own flat certificate

00:04:40

Radar and J-20

00:04:42

Really proud of the country I love

00:04:45

I'm uncle Rocket Watch as I tell you some interesting science stories

Description:

本频道制作的所有视频都是为了向观众传递有趣的科普知识，绝对符合平台的使用政策。 #科学火箭叔#雷达#科普#文化我的热爱，就是分享科普知识，把现象背后的原理用清晰简洁的语言和生动有趣的画面带给大家。那么，今天我们就一起来聊一聊当相控阵雷达碰上隐形战斗机，会发生什么？一起揭开它们的工作原理吧！大家好，我是火箭叔~ 讲有趣的科学，教有料的创客！通过对自然科学和社会科学知识的描述，勾勒出科学知识图景的整体轮廓！想要了解更多知识，尽在【科学火箭叔】 --------------------------------------------------------------------------------- 喜欢我就订阅我吧，不要忘记点击小铃铛奥🔔您的支持对我来说很宝贵！💨 【https://www.youtube.com/channel/UC8dD8v_uIA7aRzpqaCoIHKg/?sub_confirmation=1%E3%80%91 引用视频素材： Curious Droid：https://www.youtube.com/channel/UC726J5A0LLFRxQ0SZqr2mYQ Practical Engineering：https://www.youtube.com/channel/UCMOqf8ab-42UUQIdVoKwjlQ Real Engineering：https://www.youtube.com/channel/UCR1IuLEqb6UEA_zQ81kwXfg

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